[PATCH 01/23] spi: fsl-espi: dont include irq.h

[PATCH 01/23] spi: fsl-espi: dont include irq.h

[Heiner Kallweit]

irq.h isn't needed and it even shouldn't be included, see comment
at the beginning of this header file.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 96a2442..d95fdd0 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -12,7 +12,6 @@
 #include <linux/err.h>
 #include <linux/fsl_devices.h>
 #include <linux/interrupt.h>
-#include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/of.h>
-- 
2.9.2


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[PATCH 02/23] spi: fsl-espi: pre-allocate message buffer

[Heiner Kallweit]

Currently the driver allocates a 64kb buffer with each single message.
On systems with little and fragmented memory this can result in
memory allocation errors. Solve this by pre-allocating a buffer.

This patch was developed in OpenWRT long ago, however it never
made it upstream. I slightly modified the original patch to
re-initialize the buffer at the beginning of each transfer.

Original author: Gabor Juhos <juhosg-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 39 ++++++++++++++++-----------------------
 drivers/spi/spi-fsl-lib.h  |  1 +
 2 files changed, 17 insertions(+), 23 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index d95fdd0..2c4b2f8 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -319,57 +319,42 @@ static void fsl_espi_do_trans(struct spi_message *m,
 static void fsl_espi_cmd_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_transfer *t;
-	u8 *local_buf;
 	int i = 0;
 	struct fsl_espi_transfer *espi_trans = trans;
 
-	local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!local_buf) {
-		espi_trans->status = -ENOMEM;
-		return;
-	}
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf) {
-			memcpy(local_buf + i, t->tx_buf, t->len);
+			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
 			i += t->len;
 		}
 	}
 
-	espi_trans->tx_buf = local_buf;
-	espi_trans->rx_buf = local_buf;
+	espi_trans->tx_buf = espi_trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, espi_trans);
 
 	espi_trans->actual_length = espi_trans->len;
-	kfree(local_buf);
 }
 
 static void fsl_espi_rw_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_transfer *t;
-	u8 *local_buf;
 	unsigned int tx_only = 0;
 	int i = 0;
 
-	local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!local_buf) {
-		trans->status = -ENOMEM;
-		return;
-	}
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf) {
-			memcpy(local_buf + i, t->tx_buf, t->len);
+			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
 			i += t->len;
 			if (!t->rx_buf)
 				tx_only += t->len;
 		}
 	}
 
-	trans->tx_buf = local_buf;
-	trans->rx_buf = local_buf;
+	trans->tx_buf = trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, trans);
 
 	if (!trans->status) {
@@ -379,13 +364,12 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 			       trans->len - tx_only);
 		trans->actual_length += trans->len;
 	}
-
-	kfree(local_buf);
 }
 
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int n_tx = 0;
@@ -393,6 +377,8 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
+	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
+
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf)
 			n_tx += t->len;
@@ -649,6 +635,13 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
 
 	mpc8xxx_spi = spi_master_get_devdata(master);
 
+	mpc8xxx_spi->local_buf =
+		devm_kmalloc(dev, SPCOM_TRANLEN_MAX, GFP_KERNEL);
+	if (!mpc8xxx_spi->local_buf) {
+		ret = -ENOMEM;
+		goto err_probe;
+	}
+
 	mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
 	if (IS_ERR(mpc8xxx_spi->reg_base)) {
 		ret = PTR_ERR(mpc8xxx_spi->reg_base);
diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h
index 84f5dcb..065b9db 100644
--- a/drivers/spi/spi-fsl-lib.h
+++ b/drivers/spi/spi-fsl-lib.h
@@ -30,6 +30,7 @@ struct mpc8xxx_spi {
 	void *rx;
 #if IS_ENABLED(CONFIG_SPI_FSL_ESPI)
 	int len;
+	u8 *local_buf;
 #endif
 
 	int subblock;
-- 
2.9.2


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[PATCH 03/23] spi: fsl-espi: remove unused elements n_rx and n_tx in struct fsl_espi_transfer

[Heiner Kallweit]

Both elements are not used, so remove them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 2c4b2f8..12cb0c5 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -41,8 +41,6 @@ struct fsl_espi_transfer {
 	const void *tx_buf;
 	void *rx_buf;
 	unsigned len;
-	unsigned n_tx;
-	unsigned n_rx;
 	unsigned actual_length;
 	int status;
 };
@@ -372,26 +370,18 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
-	unsigned int n_tx = 0;
-	unsigned int n_rx = 0;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
 	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf)
-			n_tx += t->len;
-		if (t->rx_buf) {
-			n_rx += t->len;
+		if (t->rx_buf)
 			rx_buf = t->rx_buf;
-		}
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
 	}
 
-	espi_trans.n_tx = n_tx;
-	espi_trans.n_rx = n_rx;
 	espi_trans.len = xfer_len;
 	espi_trans.actual_length = 0;
 	espi_trans.status = 0;
-- 
2.9.2


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[PATCH 04/23] spi: fsl-espi: change return type of fsl_espi_setup_transfer to void

[Heiner Kallweit]

fsl_espi_setup_transfer always returns 0, so change the return type
to void.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 12cb0c5..38eced3 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -128,7 +128,7 @@ static u32 fsl_espi_tx_buf_lsb(struct mpc8xxx_spi *mpc8xxx_spi)
 	return data;
 }
 
-static int fsl_espi_setup_transfer(struct spi_device *spi,
+static void fsl_espi_setup_transfer(struct spi_device *spi,
 					struct spi_transfer *t)
 {
 	struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
@@ -193,7 +193,6 @@ static int fsl_espi_setup_transfer(struct spi_device *spi,
 	cs->hw_mode |= CSMODE_PM(pm);
 
 	fsl_espi_change_mode(spi);
-	return 0;
 }
 
 static int fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
@@ -290,13 +289,8 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	spi_message_add_tail(&trans, &message);
 
 	list_for_each_entry(t, &message.transfers, transfer_list) {
-		if (t->bits_per_word || t->speed_hz) {
-			status = -EINVAL;
-
-			status = fsl_espi_setup_transfer(spi, t);
-			if (status < 0)
-				break;
-		}
+		if (t->bits_per_word || t->speed_hz)
+			fsl_espi_setup_transfer(spi, t);
 
 		if (t->len)
 			status = fsl_espi_bufs(spi, t);
@@ -401,7 +395,6 @@ static int fsl_espi_setup(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mpc8xxx_spi;
 	struct fsl_espi_reg *reg_base;
-	int retval;
 	u32 hw_mode;
 	u32 loop_mode;
 	struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
@@ -442,15 +435,11 @@ static int fsl_espi_setup(struct spi_device *spi)
 		loop_mode |= SPMODE_LOOP;
 	mpc8xxx_spi_write_reg(&reg_base->mode, loop_mode);
 
-	retval = fsl_espi_setup_transfer(spi, NULL);
+	fsl_espi_setup_transfer(spi, NULL);
 
 	pm_runtime_mark_last_busy(mpc8xxx_spi->dev);
 	pm_runtime_put_autosuspend(mpc8xxx_spi->dev);
 
-	if (retval < 0) {
-		cs->hw_mode = hw_mode; /* Restore settings */
-		return retval;
-	}
 	return 0;
 }
 
-- 
2.9.2


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[PATCH 05/23] spi: fsl-espi: change return type of fsl_espi_cpu_bufs to void

[Heiner Kallweit]

fsl_espi_cpu_bufs always returns 0, so change the return type to void.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 38eced3..cc09ce6 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -195,7 +195,7 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
 	fsl_espi_change_mode(spi);
 }
 
-static int fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
+static void fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
 		unsigned int len)
 {
 	u32 word;
@@ -209,8 +209,6 @@ static int fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
 	/* transmit word */
 	word = mspi->get_tx(mspi);
 	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
-
-	return 0;
 }
 
 static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
@@ -237,9 +235,7 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
-	ret = fsl_espi_cpu_bufs(mpc8xxx_spi, t, len);
-	if (ret)
-		return ret;
+	fsl_espi_cpu_bufs(mpc8xxx_spi, t, len);
 
 	/* Won't hang up forever, SPI bus sometimes got lost interrupts... */
 	ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ);
-- 
2.9.2


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[PATCH 06/23] spi: fsl-espi: add missing static declaration to fsl_espi_cpu_irq

[Heiner Kallweit]

Add missing static declaration to fsl_espi_cpu_irq.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index cc09ce6..b3c3612 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -447,7 +447,7 @@ static void fsl_espi_cleanup(struct spi_device *spi)
 	spi_set_ctldata(spi, NULL);
 }
 
-void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
+static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 {
 	struct fsl_espi_reg *reg_base = mspi->reg_base;
 
-- 
2.9.2


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[PATCH 07/23] spi: fsl-espi: remove unneeded variable in fsl_espi_do_trans

[Heiner Kallweit]

Creating a message, adding one transfer, and then iterating over
all transfers in the message doesn't make sense.
We can simply use the original transfer directly.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index b3c3612..494a7bf 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -256,11 +256,9 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct fsl_espi_transfer *espi_trans = tr;
-	struct spi_message message;
 	struct spi_transfer *t, *first, trans;
 	int status = 0;
 
-	spi_message_init(&message);
 	memset(&trans, 0, sizeof(trans));
 
 	first = list_first_entry(&m->transfers, struct spi_transfer,
@@ -282,23 +280,18 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	trans.len = espi_trans->len;
 	trans.tx_buf = espi_trans->tx_buf;
 	trans.rx_buf = espi_trans->rx_buf;
-	spi_message_add_tail(&trans, &message);
 
-	list_for_each_entry(t, &message.transfers, transfer_list) {
-		if (t->bits_per_word || t->speed_hz)
-			fsl_espi_setup_transfer(spi, t);
+	if (trans.bits_per_word || trans.speed_hz)
+		fsl_espi_setup_transfer(spi, &trans);
 
-		if (t->len)
-			status = fsl_espi_bufs(spi, t);
+	if (trans.len)
+		status = fsl_espi_bufs(spi, &trans);
 
-		if (status) {
-			status = -EMSGSIZE;
-			break;
-		}
+	if (status)
+		status = -EMSGSIZE;
 
-		if (t->delay_usecs)
-			udelay(t->delay_usecs);
-	}
+	if (trans.delay_usecs)
+		udelay(trans.delay_usecs);
 
 	espi_trans->status = status;
 	fsl_espi_setup_transfer(spi, NULL);
-- 
2.9.2


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[PATCH 08/23] spi: fsl-espi: factor out filling the local buffer

[Heiner Kallweit]

Better structure the code by factoring out filling the local buffer.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 45 +++++++++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 22 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 494a7bf..c3aa6f0 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -85,6 +85,26 @@ struct fsl_espi_transfer {
 
 #define AUTOSUSPEND_TIMEOUT 2000
 
+static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
+					 struct mpc8xxx_spi *mspi)
+{
+	unsigned int tx_only = 0;
+	struct spi_transfer *t;
+	u8 *buf = mspi->local_buf;
+
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (t->tx_buf) {
+			memcpy(buf, t->tx_buf, t->len);
+			if (!t->rx_buf)
+				tx_only += t->len;
+		} else
+			memset(buf, 0, t->len);
+		buf += t->len;
+	}
+
+	return tx_only;
+}
+
 static void fsl_espi_change_mode(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@@ -301,16 +321,9 @@ static void fsl_espi_cmd_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct spi_transfer *t;
-	int i = 0;
 	struct fsl_espi_transfer *espi_trans = trans;
 
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
-			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
-			i += t->len;
-		}
-	}
+	fsl_espi_copy_to_buf(m, mspi);
 
 	espi_trans->tx_buf = espi_trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, espi_trans);
@@ -322,18 +335,9 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct spi_transfer *t;
-	unsigned int tx_only = 0;
-	int i = 0;
+	unsigned int tx_only;
 
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
-			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
-			i += t->len;
-			if (!t->rx_buf)
-				tx_only += t->len;
-		}
-	}
+	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
 	trans->tx_buf = trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, trans);
@@ -350,14 +354,11 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
-	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
-- 
2.9.2


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[PATCH 09/23] spi: fsl-espi: remove element status from struct fsl_espi_transfer

[Heiner Kallweit]

Use the return values of the functions in the call chain to transport
status information instead of using an element in struct
fsl_espi_transfer for this.

This is more in line with the general approach how to handle status
information and is one step further to eventually get rid of
struct fsl_espi_transfer completely.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 47 +++++++++++++++++++++++++---------------------
 1 file changed, 26 insertions(+), 21 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index c3aa6f0..68bf72a 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -42,7 +42,6 @@ struct fsl_espi_transfer {
 	void *rx_buf;
 	unsigned len;
 	unsigned actual_length;
-	int status;
 };
 
 /* eSPI Controller mode register definitions */
@@ -270,14 +269,14 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count;
 }
 
-static void fsl_espi_do_trans(struct spi_message *m,
-				struct fsl_espi_transfer *tr)
+static int fsl_espi_do_trans(struct spi_message *m,
+			     struct fsl_espi_transfer *tr)
 {
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct fsl_espi_transfer *espi_trans = tr;
 	struct spi_transfer *t, *first, trans;
-	int status = 0;
+	int ret = 0;
 
 	memset(&trans, 0, sizeof(trans));
 
@@ -286,10 +285,9 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if ((first->bits_per_word != t->bits_per_word) ||
 			(first->speed_hz != t->speed_hz)) {
-			espi_trans->status = -EINVAL;
 			dev_err(mspi->dev,
 				"bits_per_word/speed_hz should be same for the same SPI transfer\n");
-			return;
+			return -EINVAL;
 		}
 
 		trans.speed_hz = t->speed_hz;
@@ -305,50 +303,57 @@ static void fsl_espi_do_trans(struct spi_message *m,
 		fsl_espi_setup_transfer(spi, &trans);
 
 	if (trans.len)
-		status = fsl_espi_bufs(spi, &trans);
+		ret = fsl_espi_bufs(spi, &trans);
 
-	if (status)
-		status = -EMSGSIZE;
+	if (ret)
+		ret = -EMSGSIZE;
 
 	if (trans.delay_usecs)
 		udelay(trans.delay_usecs);
 
-	espi_trans->status = status;
 	fsl_espi_setup_transfer(spi, NULL);
+
+	return ret;
 }
 
-static void fsl_espi_cmd_trans(struct spi_message *m,
-				struct fsl_espi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_cmd_trans(struct spi_message *m,
+			      struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct fsl_espi_transfer *espi_trans = trans;
+	int ret;
 
 	fsl_espi_copy_to_buf(m, mspi);
 
 	espi_trans->tx_buf = espi_trans->rx_buf = mspi->local_buf;
-	fsl_espi_do_trans(m, espi_trans);
+	ret = fsl_espi_do_trans(m, espi_trans);
 
 	espi_trans->actual_length = espi_trans->len;
+
+	return ret;
 }
 
-static void fsl_espi_rw_trans(struct spi_message *m,
-				struct fsl_espi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_rw_trans(struct spi_message *m,
+			     struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
+	int ret;
 
 	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
 	trans->tx_buf = trans->rx_buf = mspi->local_buf;
-	fsl_espi_do_trans(m, trans);
+	ret = fsl_espi_do_trans(m, trans);
 
-	if (!trans->status) {
+	if (!ret) {
 		/* If there is at least one RX byte then copy it to rx_buff */
 		if (trans->len > tx_only)
 			memcpy(rx_buff, trans->rx_buf + tx_only,
 			       trans->len - tx_only);
 		trans->actual_length += trans->len;
 	}
+
+	return ret;
 }
 
 static int fsl_espi_do_one_msg(struct spi_master *master,
@@ -358,6 +363,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
+	int ret;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
@@ -368,15 +374,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 
 	espi_trans.len = xfer_len;
 	espi_trans.actual_length = 0;
-	espi_trans.status = 0;
 
 	if (!rx_buf)
-		fsl_espi_cmd_trans(m, &espi_trans, NULL);
+		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
 	else
-		fsl_espi_rw_trans(m, &espi_trans, rx_buf);
+		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
 	m->actual_length = espi_trans.actual_length;
-	m->status = espi_trans.status;
+	m->status = ret;
 	spi_finalize_current_message(master);
 	return 0;
 }
-- 
2.9.2


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[PATCH 10/23] spi: fsl-espi: fix status handling in fsl_espi_do_one_msg

[Heiner Kallweit]

If an error occurred during message handling return this error instead
of always returning 0 and align the code with the generic
implementation in spi_transfer_one_message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 68bf72a..c15d2bc 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -381,9 +381,12 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
 	m->actual_length = espi_trans.actual_length;
-	m->status = ret;
+	if (m->status == -EINPROGRESS)
+		m->status = ret;
+
 	spi_finalize_current_message(master);
-	return 0;
+
+	return ret;
 }
 
 static int fsl_espi_setup(struct spi_device *spi)
-- 
2.9.2


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[PATCH 11/23] spi: fsl-espi: remove element actual_length from struct fsl_espi_trans

[Heiner Kallweit]

If an error occurs during processing the message, then we don't have
to populate the actual_length element of struct message.
So we can get rid of element actual_length in struct
fsl_espi_transfer.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index c15d2bc..4ff27bf 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -41,7 +41,6 @@ struct fsl_espi_transfer {
 	const void *tx_buf;
 	void *rx_buf;
 	unsigned len;
-	unsigned actual_length;
 };
 
 /* eSPI Controller mode register definitions */
@@ -328,8 +327,6 @@ static int fsl_espi_cmd_trans(struct spi_message *m,
 	espi_trans->tx_buf = espi_trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, espi_trans);
 
-	espi_trans->actual_length = espi_trans->len;
-
 	return ret;
 }
 
@@ -350,7 +347,6 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 		if (trans->len > tx_only)
 			memcpy(rx_buff, trans->rx_buf + tx_only,
 			       trans->len - tx_only);
-		trans->actual_length += trans->len;
 	}
 
 	return ret;
@@ -373,14 +369,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	}
 
 	espi_trans.len = xfer_len;
-	espi_trans.actual_length = 0;
 
 	if (!rx_buf)
 		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
 	else
 		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
-	m->actual_length = espi_trans.actual_length;
+	m->actual_length = ret ? 0 : espi_trans.len;
+
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
 
-- 
2.9.2


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[PATCH 12/23] spi: fsl-espi: eliminate struct fsl_espi_transfer

[Heiner Kallweit]

The remaining elements of struct fsl_espi_transfer are part of struct
spi_transfer anyway. So we can get rid of struct fsl_espi_transfer
and use a struct spi_transfer only.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 56 +++++++++++++++++-----------------------------
 1 file changed, 20 insertions(+), 36 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 4ff27bf..4c36a5d 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -37,12 +37,6 @@ struct fsl_espi_reg {
 	__be32 csmode[4];	/* 0x020 - 0x02c eSPI cs mode register */
 };
 
-struct fsl_espi_transfer {
-	const void *tx_buf;
-	void *rx_buf;
-	unsigned len;
-};
-
 /* eSPI Controller mode register definitions */
 #define SPMODE_ENABLE		(1 << 31)
 #define SPMODE_LOOP		(1 << 30)
@@ -268,17 +262,13 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count;
 }
 
-static int fsl_espi_do_trans(struct spi_message *m,
-			     struct fsl_espi_transfer *tr)
+static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
-	struct fsl_espi_transfer *espi_trans = tr;
-	struct spi_transfer *t, *first, trans;
+	struct spi_transfer *t, *first;
 	int ret = 0;
 
-	memset(&trans, 0, sizeof(trans));
-
 	first = list_first_entry(&m->transfers, struct spi_transfer,
 			transfer_list);
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -289,26 +279,22 @@ static int fsl_espi_do_trans(struct spi_message *m,
 			return -EINVAL;
 		}
 
-		trans.speed_hz = t->speed_hz;
-		trans.bits_per_word = t->bits_per_word;
-		trans.delay_usecs = max(first->delay_usecs, t->delay_usecs);
+		trans->speed_hz = t->speed_hz;
+		trans->bits_per_word = t->bits_per_word;
+		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
 	}
 
-	trans.len = espi_trans->len;
-	trans.tx_buf = espi_trans->tx_buf;
-	trans.rx_buf = espi_trans->rx_buf;
-
-	if (trans.bits_per_word || trans.speed_hz)
-		fsl_espi_setup_transfer(spi, &trans);
+	if (trans->bits_per_word || trans->speed_hz)
+		fsl_espi_setup_transfer(spi, trans);
 
-	if (trans.len)
-		ret = fsl_espi_bufs(spi, &trans);
+	if (trans->len)
+		ret = fsl_espi_bufs(spi, trans);
 
 	if (ret)
 		ret = -EMSGSIZE;
 
-	if (trans.delay_usecs)
-		udelay(trans.delay_usecs);
+	if (trans->delay_usecs)
+		udelay(trans->delay_usecs);
 
 	fsl_espi_setup_transfer(spi, NULL);
 
@@ -316,22 +302,21 @@ static int fsl_espi_do_trans(struct spi_message *m,
 }
 
 static int fsl_espi_cmd_trans(struct spi_message *m,
-			      struct fsl_espi_transfer *trans, u8 *rx_buff)
+			      struct spi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct fsl_espi_transfer *espi_trans = trans;
 	int ret;
 
 	fsl_espi_copy_to_buf(m, mspi);
 
-	espi_trans->tx_buf = espi_trans->rx_buf = mspi->local_buf;
-	ret = fsl_espi_do_trans(m, espi_trans);
+	trans->tx_buf = trans->rx_buf = mspi->local_buf;
+	ret = fsl_espi_do_trans(m, trans);
 
 	return ret;
 }
 
 static int fsl_espi_rw_trans(struct spi_message *m,
-			     struct fsl_espi_transfer *trans, u8 *rx_buff)
+			     struct spi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
@@ -355,10 +340,9 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
-	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
-	struct fsl_espi_transfer espi_trans;
+	struct spi_transfer *t, trans = {};
 	int ret;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -368,14 +352,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			xfer_len += t->len;
 	}
 
-	espi_trans.len = xfer_len;
+	trans.len = xfer_len;
 
 	if (!rx_buf)
-		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
+		ret = fsl_espi_cmd_trans(m, &trans, NULL);
 	else
-		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
+		ret = fsl_espi_rw_trans(m, &trans, rx_buf);
 
-	m->actual_length = ret ? 0 : espi_trans.len;
+	m->actual_length = ret ? 0 : trans.len;
 
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
-- 
2.9.2

>From 50844eb4dd9f76cf213ea3baa1ab742f09232c58 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Fri, 19 Aug 2016 20:59:01 +0200
Subject: [PATCH 12/23] remove struct fsl_espi_transfer

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 56 +++++++++++++++++-----------------------------
 1 file changed, 20 insertions(+), 36 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 4ff27bf..4c36a5d 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -37,12 +37,6 @@ struct fsl_espi_reg {
 	__be32 csmode[4];	/* 0x020 - 0x02c eSPI cs mode register */
 };
 
-struct fsl_espi_transfer {
-	const void *tx_buf;
-	void *rx_buf;
-	unsigned len;
-};
-
 /* eSPI Controller mode register definitions */
 #define SPMODE_ENABLE		(1 << 31)
 #define SPMODE_LOOP		(1 << 30)
@@ -268,17 +262,13 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count;
 }
 
-static int fsl_espi_do_trans(struct spi_message *m,
-			     struct fsl_espi_transfer *tr)
+static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
-	struct fsl_espi_transfer *espi_trans = tr;
-	struct spi_transfer *t, *first, trans;
+	struct spi_transfer *t, *first;
 	int ret = 0;
 
-	memset(&trans, 0, sizeof(trans));
-
 	first = list_first_entry(&m->transfers, struct spi_transfer,
 			transfer_list);
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -289,26 +279,22 @@ static int fsl_espi_do_trans(struct spi_message *m,
 			return -EINVAL;
 		}
 
-		trans.speed_hz = t->speed_hz;
-		trans.bits_per_word = t->bits_per_word;
-		trans.delay_usecs = max(first->delay_usecs, t->delay_usecs);
+		trans->speed_hz = t->speed_hz;
+		trans->bits_per_word = t->bits_per_word;
+		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
 	}
 
-	trans.len = espi_trans->len;
-	trans.tx_buf = espi_trans->tx_buf;
-	trans.rx_buf = espi_trans->rx_buf;
-
-	if (trans.bits_per_word || trans.speed_hz)
-		fsl_espi_setup_transfer(spi, &trans);
+	if (trans->bits_per_word || trans->speed_hz)
+		fsl_espi_setup_transfer(spi, trans);
 
-	if (trans.len)
-		ret = fsl_espi_bufs(spi, &trans);
+	if (trans->len)
+		ret = fsl_espi_bufs(spi, trans);
 
 	if (ret)
 		ret = -EMSGSIZE;
 
-	if (trans.delay_usecs)
-		udelay(trans.delay_usecs);
+	if (trans->delay_usecs)
+		udelay(trans->delay_usecs);
 
 	fsl_espi_setup_transfer(spi, NULL);
 
@@ -316,22 +302,21 @@ static int fsl_espi_do_trans(struct spi_message *m,
 }
 
 static int fsl_espi_cmd_trans(struct spi_message *m,
-			      struct fsl_espi_transfer *trans, u8 *rx_buff)
+			      struct spi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct fsl_espi_transfer *espi_trans = trans;
 	int ret;
 
 	fsl_espi_copy_to_buf(m, mspi);
 
-	espi_trans->tx_buf = espi_trans->rx_buf = mspi->local_buf;
-	ret = fsl_espi_do_trans(m, espi_trans);
+	trans->tx_buf = trans->rx_buf = mspi->local_buf;
+	ret = fsl_espi_do_trans(m, trans);
 
 	return ret;
 }
 
 static int fsl_espi_rw_trans(struct spi_message *m,
-			     struct fsl_espi_transfer *trans, u8 *rx_buff)
+			     struct spi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
@@ -355,10 +340,9 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
-	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
-	struct fsl_espi_transfer espi_trans;
+	struct spi_transfer *t, trans = {};
 	int ret;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -368,14 +352,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			xfer_len += t->len;
 	}
 
-	espi_trans.len = xfer_len;
+	trans.len = xfer_len;
 
 	if (!rx_buf)
-		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
+		ret = fsl_espi_cmd_trans(m, &trans, NULL);
 	else
-		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
+		ret = fsl_espi_rw_trans(m, &trans, rx_buf);
 
-	m->actual_length = ret ? 0 : espi_trans.len;
+	m->actual_length = ret ? 0 : trans.len;
 
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
-- 
2.9.2


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[PATCH 13/23] spi: fsl-espi: merge fsl_espi_cmd_trans and fsl_espi_rw_trans

[Heiner Kallweit]

fsl_espi_cmd_trans and fsl_espi_rw_trans share most of the code so
we can merge them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 32 ++++++--------------------------
 1 file changed, 6 insertions(+), 26 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 4c36a5d..6d06e14 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -301,22 +301,8 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	return ret;
 }
 
-static int fsl_espi_cmd_trans(struct spi_message *m,
-			      struct spi_transfer *trans, u8 *rx_buff)
-{
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	int ret;
-
-	fsl_espi_copy_to_buf(m, mspi);
-
-	trans->tx_buf = trans->rx_buf = mspi->local_buf;
-	ret = fsl_espi_do_trans(m, trans);
-
-	return ret;
-}
-
-static int fsl_espi_rw_trans(struct spi_message *m,
-			     struct spi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
+			  u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
@@ -327,12 +313,9 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 	trans->tx_buf = trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, trans);
 
-	if (!ret) {
-		/* If there is at least one RX byte then copy it to rx_buff */
-		if (trans->len > tx_only)
-			memcpy(rx_buff, trans->rx_buf + tx_only,
-			       trans->len - tx_only);
-	}
+	/* If there is at least one RX byte then copy it to rx_buff */
+	if (!ret && rx_buff && trans->len > tx_only)
+		memcpy(rx_buff, trans->rx_buf + tx_only, trans->len - tx_only);
 
 	return ret;
 }
@@ -354,10 +337,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 
 	trans.len = xfer_len;
 
-	if (!rx_buf)
-		ret = fsl_espi_cmd_trans(m, &trans, NULL);
-	else
-		ret = fsl_espi_rw_trans(m, &trans, rx_buf);
+	ret = fsl_espi_trans(m, &trans, rx_buf);
 
 	m->actual_length = ret ? 0 : trans.len;
 
-- 
2.9.2


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[PATCH 14/23] spi: fsl-espi: remove unneeded check in fsl_espi_do_trans

[Heiner Kallweit]

SPI core takes care that both values are always populated.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 6d06e14..4c64012 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -284,8 +284,7 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
 	}
 
-	if (trans->bits_per_word || trans->speed_hz)
-		fsl_espi_setup_transfer(spi, trans);
+	fsl_espi_setup_transfer(spi, trans);
 
 	if (trans->len)
 		ret = fsl_espi_bufs(spi, trans);
-- 
2.9.2


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[PATCH 15/23] spi: fsl-espi: improve return value handling in fsl_espi_bufs

[Heiner Kallweit]

Return a proper status code from fsl_espi_bufs instead of returning
the number of remaining words and let the caller evaluate it.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 4c64012..821ec3e 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -259,7 +259,7 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	/* disable rx ints */
 	mpc8xxx_spi_write_reg(&reg_base->mask, 0);
 
-	return mpc8xxx_spi->count;
+	return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0;
 }
 
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
@@ -289,9 +289,6 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	if (trans->len)
 		ret = fsl_espi_bufs(spi, trans);
 
-	if (ret)
-		ret = -EMSGSIZE;
-
 	if (trans->delay_usecs)
 		udelay(trans->delay_usecs);
 
-- 
2.9.2


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[PATCH 16/23] spi: fsl-espi: merge fsl_espi_bufs and fsl_espi_cpu_bufs

[Heiner Kallweit]

fsl_espi_bufs and fsl_espi_cpu_bufs are very small that we can merge them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 27 ++++++++-------------------
 1 file changed, 8 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 821ec3e..ee4e778 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -207,31 +207,15 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
 	fsl_espi_change_mode(spi);
 }
 
-static void fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
-		unsigned int len)
-{
-	u32 word;
-	struct fsl_espi_reg *reg_base = mspi->reg_base;
-
-	mspi->count = len;
-
-	/* enable rx ints */
-	mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
-
-	/* transmit word */
-	word = mspi->get_tx(mspi);
-	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
-}
-
 static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 {
 	struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
 	struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
-	unsigned int len = t->len;
+	u32 word;
 	int ret;
 
 	mpc8xxx_spi->len = t->len;
-	len = roundup(len, 4) / 4;
+	mpc8xxx_spi->count = roundup(t->len, 4) / 4;
 
 	mpc8xxx_spi->tx = t->tx_buf;
 	mpc8xxx_spi->rx = t->rx_buf;
@@ -247,7 +231,12 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
-	fsl_espi_cpu_bufs(mpc8xxx_spi, t, len);
+	/* enable rx ints */
+	mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
+
+	/* transmit word */
+	word = mpc8xxx_spi->get_tx(mpc8xxx_spi);
+	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
 
 	/* Won't hang up forever, SPI bus sometimes got lost interrupts... */
 	ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ);
-- 
2.9.2


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[PATCH 17/23] spi: fsl-espi: improve the ISR frame

[Heiner Kallweit]

Improve the ISR frame:
- move resetting the event bits to the ISR frame
- change type of parameter irq to int
- make sure that the event bits match at least one bit in the
  interrupt mask register

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index ee4e778..8d5bebc 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -451,17 +451,11 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 				&reg_base->event)) & SPIE_NF), 1000, 0);
 		if (!ret) {
 			dev_err(mspi->dev, "tired waiting for SPIE_NF\n");
-
-			/* Clear the SPIE bits */
-			mpc8xxx_spi_write_reg(&reg_base->event, events);
 			complete(&mspi->done);
 			return;
 		}
 	}
 
-	/* Clear the events */
-	mpc8xxx_spi_write_reg(&reg_base->event, events);
-
 	mspi->count -= 1;
 	if (mspi->count) {
 		u32 word = mspi->get_tx(mspi);
@@ -472,23 +466,26 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 	}
 }
 
-static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
+static irqreturn_t fsl_espi_irq(int irq, void *context_data)
 {
 	struct mpc8xxx_spi *mspi = context_data;
 	struct fsl_espi_reg *reg_base = mspi->reg_base;
-	irqreturn_t ret = IRQ_NONE;
-	u32 events;
+	u32 mask, events;
 
-	/* Get interrupt events(tx/rx) */
+	/* Get interrupt mask and events and check that irq belongs to us */
+	mask = mpc8xxx_spi_read_reg(&reg_base->mask);
 	events = mpc8xxx_spi_read_reg(&reg_base->event);
-	if (events)
-		ret = IRQ_HANDLED;
+	if (!(mask & events))
+		return IRQ_NONE;
 
 	dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events);
 
 	fsl_espi_cpu_irq(mspi, events);
 
-	return ret;
+	/* Clear the events */
+	mpc8xxx_spi_write_reg(&reg_base->event, events);
+
+	return IRQ_HANDLED;
 }
 
 #ifdef CONFIG_PM
-- 
2.9.2


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[PATCH 18/23] spi: fsl-espi: factor out initial message checking

[Heiner Kallweit]

Checking the message is currently done at diffrent places in the
driver. Factor it out to fsl_espi_check_message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 43 +++++++++++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8d5bebc..d398caf 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -97,6 +97,30 @@ static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
 	return tx_only;
 }
 
+static int fsl_espi_check_message(struct spi_message *m)
+{
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
+	struct spi_transfer *t, *first;
+
+	if (m->frame_length > SPCOM_TRANLEN_MAX) {
+		dev_err(mspi->dev, "message too long, size is %u bytes\n",
+			m->frame_length);
+		return -EMSGSIZE;
+	}
+
+	first = list_first_entry(&m->transfers, struct spi_transfer,
+				 transfer_list);
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (first->bits_per_word != t->bits_per_word ||
+		    first->speed_hz != t->speed_hz) {
+			dev_err(mspi->dev, "bits_per_word/speed_hz should be the same for all transfers\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
 static void fsl_espi_change_mode(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@@ -223,11 +247,6 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	reinit_completion(&mpc8xxx_spi->done);
 
 	/* Set SPCOM[CS] and SPCOM[TRANLEN] field */
-	if (t->len > SPCOM_TRANLEN_MAX) {
-		dev_err(mpc8xxx_spi->dev, "Transaction length (%d)"
-				" beyond the SPCOM[TRANLEN] field\n", t->len);
-		return -EINVAL;
-	}
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
@@ -254,20 +273,12 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct spi_transfer *t, *first;
 	int ret = 0;
 
 	first = list_first_entry(&m->transfers, struct spi_transfer,
 			transfer_list);
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if ((first->bits_per_word != t->bits_per_word) ||
-			(first->speed_hz != t->speed_hz)) {
-			dev_err(mspi->dev,
-				"bits_per_word/speed_hz should be same for the same SPI transfer\n");
-			return -EINVAL;
-		}
-
 		trans->speed_hz = t->speed_hz;
 		trans->bits_per_word = t->bits_per_word;
 		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
@@ -313,6 +324,10 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	struct spi_transfer *t, trans = {};
 	int ret;
 
+	ret = fsl_espi_check_message(m);
+	if (ret)
+		goto out;
+
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
@@ -325,7 +340,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	ret = fsl_espi_trans(m, &trans, rx_buf);
 
 	m->actual_length = ret ? 0 : trans.len;
-
+out:
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
 
-- 
2.9.2


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[PATCH 19/23] spi: fsl-espi: centralize populating struct spi_transfer

[Heiner Kallweit]

Better structure the code by population all elements of struct
spi_transfer in one place.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index d398caf..56f3a3d 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -273,17 +273,8 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
-	struct spi_transfer *t, *first;
 	int ret = 0;
 
-	first = list_first_entry(&m->transfers, struct spi_transfer,
-			transfer_list);
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		trans->speed_hz = t->speed_hz;
-		trans->bits_per_word = t->bits_per_word;
-		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
-	}
-
 	fsl_espi_setup_transfer(spi, trans);
 
 	if (trans->len)
@@ -306,7 +297,6 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
 
 	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
-	trans->tx_buf = trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, trans);
 
 	/* If there is at least one RX byte then copy it to rx_buff */
@@ -319,8 +309,9 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	u8 *rx_buf = NULL;
-	unsigned int xfer_len = 0;
+	unsigned int delay_usecs = 0, xfer_len = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
 
@@ -333,9 +324,18 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			rx_buf = t->rx_buf;
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
+		if (t->delay_usecs > delay_usecs)
+			delay_usecs = t->delay_usecs;
 	}
 
+	t = list_first_entry(&m->transfers, struct spi_transfer,
+			     transfer_list);
+
 	trans.len = xfer_len;
+	trans.speed_hz = t->speed_hz;
+	trans.bits_per_word = t->bits_per_word;
+	trans.delay_usecs = delay_usecs;
+	trans.tx_buf = trans.rx_buf = mspi->local_buf;
 
 	ret = fsl_espi_trans(m, &trans, rx_buf);
 
-- 
2.9.2


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[PATCH 20/23] spi: fsl-espi: factor out handling of read data

[Heiner Kallweit]

Factor out copying read data to the read buffers in the original
message to a new function fsl_espi_copy_from_buf.
This also allows to simplify fsl_espi_copy_to_buf.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 40 +++++++++++++++++++++-------------------
 1 file changed, 21 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 56f3a3d..d348a66 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -77,24 +77,32 @@ struct fsl_espi_reg {
 
 #define AUTOSUSPEND_TIMEOUT 2000
 
-static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
-					 struct mpc8xxx_spi *mspi)
+static void fsl_espi_copy_to_buf(struct spi_message *m,
+				 struct mpc8xxx_spi *mspi)
 {
-	unsigned int tx_only = 0;
 	struct spi_transfer *t;
 	u8 *buf = mspi->local_buf;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
+		if (t->tx_buf)
 			memcpy(buf, t->tx_buf, t->len);
-			if (!t->rx_buf)
-				tx_only += t->len;
-		} else
+		else
 			memset(buf, 0, t->len);
 		buf += t->len;
 	}
+}
+
+static void fsl_espi_copy_from_buf(struct spi_message *m,
+				   struct mpc8xxx_spi *mspi)
+{
+	struct spi_transfer *t;
+	u8 *buf = mspi->local_buf;
 
-	return tx_only;
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (t->rx_buf)
+			memcpy(t->rx_buf, buf, t->len);
+		buf += t->len;
+	}
 }
 
 static int fsl_espi_check_message(struct spi_message *m)
@@ -288,20 +296,17 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	return ret;
 }
 
-static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
-			  u8 *rx_buff)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	unsigned int tx_only;
 	int ret;
 
-	tx_only = fsl_espi_copy_to_buf(m, mspi);
+	fsl_espi_copy_to_buf(m, mspi);
 
 	ret = fsl_espi_do_trans(m, trans);
 
-	/* If there is at least one RX byte then copy it to rx_buff */
-	if (!ret && rx_buff && trans->len > tx_only)
-		memcpy(rx_buff, trans->rx_buf + tx_only, trans->len - tx_only);
+	if (!ret)
+		fsl_espi_copy_from_buf(m, mspi);
 
 	return ret;
 }
@@ -310,7 +315,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	u8 *rx_buf = NULL;
 	unsigned int delay_usecs = 0, xfer_len = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
@@ -320,8 +324,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		goto out;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->rx_buf)
-			rx_buf = t->rx_buf;
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
 		if (t->delay_usecs > delay_usecs)
@@ -337,7 +339,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	trans.delay_usecs = delay_usecs;
 	trans.tx_buf = trans.rx_buf = mspi->local_buf;
 
-	ret = fsl_espi_trans(m, &trans, rx_buf);
+	ret = fsl_espi_trans(m, &trans);
 
 	m->actual_length = ret ? 0 : trans.len;
 out:
-- 
2.9.2


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[PATCH 21/23] spi: fsl-espi: simplify fsl_espi_setup_transfer

[Heiner Kallweit]

Simplify fsl_espi_setup_transfer a little.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index d348a66..a5a67ce 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -210,12 +210,10 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
 	mpc8xxx_spi->get_rx = cs->get_rx;
 	mpc8xxx_spi->get_tx = cs->get_tx;
 
-	bits_per_word = bits_per_word - 1;
-
 	/* mask out bits we are going to set */
 	cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF));
 
-	cs->hw_mode |= CSMODE_LEN(bits_per_word);
+	cs->hw_mode |= CSMODE_LEN(bits_per_word - 1);
 
 	if ((mpc8xxx_spi->spibrg / hz) > 64) {
 		cs->hw_mode |= CSMODE_DIV16;
-- 
2.9.2


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[PATCH 22/23] spi: fsl-espi: improve message length handling

[Heiner Kallweit]

Move checking for a zero-length message up in the call chain and
use m->frame_length instead of re-calculating the overall length
of all transfers in the message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index a5a67ce..51b0213 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -283,8 +283,7 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 
 	fsl_espi_setup_transfer(spi, trans);
 
-	if (trans->len)
-		ret = fsl_espi_bufs(spi, trans);
+	ret = fsl_espi_bufs(spi, trans);
 
 	if (trans->delay_usecs)
 		udelay(trans->delay_usecs);
@@ -313,7 +312,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	unsigned int delay_usecs = 0, xfer_len = 0;
+	unsigned int delay_usecs = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
 
@@ -322,8 +321,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		goto out;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if ((t->tx_buf) || (t->rx_buf))
-			xfer_len += t->len;
 		if (t->delay_usecs > delay_usecs)
 			delay_usecs = t->delay_usecs;
 	}
@@ -331,13 +328,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	t = list_first_entry(&m->transfers, struct spi_transfer,
 			     transfer_list);
 
-	trans.len = xfer_len;
+	trans.len = m->frame_length;
 	trans.speed_hz = t->speed_hz;
 	trans.bits_per_word = t->bits_per_word;
 	trans.delay_usecs = delay_usecs;
 	trans.tx_buf = trans.rx_buf = mspi->local_buf;
 
-	ret = fsl_espi_trans(m, &trans);
+	if (trans.len)
+		ret = fsl_espi_trans(m, &trans);
 
 	m->actual_length = ret ? 0 : trans.len;
 out:
-- 
2.9.2


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[PATCH 23/23] spi: fsl-espi: merge fsl_espi_trans and fsl_espi_do_trans

[Heiner Kallweit]

Merge both functions to reduce source code size and improve
readability.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 51b0213..caedabd 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -276,11 +276,13 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0;
 }
 
-static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_device *spi = m->spi;
-	int ret = 0;
+	int ret;
 
+	fsl_espi_copy_to_buf(m, mspi);
 	fsl_espi_setup_transfer(spi, trans);
 
 	ret = fsl_espi_bufs(spi, trans);
@@ -290,18 +292,6 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 
 	fsl_espi_setup_transfer(spi, NULL);
 
-	return ret;
-}
-
-static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
-{
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	int ret;
-
-	fsl_espi_copy_to_buf(m, mspi);
-
-	ret = fsl_espi_do_trans(m, trans);
-
 	if (!ret)
 		fsl_espi_copy_from_buf(m, mspi);
 
-- 
2.9.2


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Re: [PATCH 02/23] spi: fsl-espi: pre-allocate message buffer

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 590 bytes --]

On Thu, Aug 25, 2016 at 06:44:06AM +0200, Heiner Kallweit wrote:

> Original author: Gabor Juhos <juhosg-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>
> 
> Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

Why is this not a proper signoff?

> -	espi_trans->tx_buf = local_buf;
> -	espi_trans->rx_buf = local_buf;
> +	espi_trans->tx_buf = espi_trans->rx_buf = mspi->local_buf;

This is regressing the coding style, please don't do multiple
assignments in a single line as it makes things harder to understand -
the original code was better here.

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Re: [PATCH 03/23] spi: fsl-espi: remove unused elements n_rx and n_tx in struct fsl_espi_transfer

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 335 bytes --]

On Thu, Aug 25, 2016 at 06:44:19AM +0200, Heiner Kallweit wrote:
> Both elements are not used, so remove them.

Mechanical changes like this are better done before more substantial
optimisations and enhancements like the previous patch, that way they
won't get blocked if there's a problem with the previous patch as is the
case here.

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Re: [PATCH 08/23] spi: fsl-espi: factor out filling the local buffer

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 382 bytes --]

On Thu, Aug 25, 2016 at 06:46:26AM +0200, Heiner Kallweit wrote:

> +		if (t->tx_buf) {
> +			memcpy(buf, t->tx_buf, t->len);
> +			if (!t->rx_buf)
> +				tx_only += t->len;
> +		} else
> +			memset(buf, 0, t->len);

Coding style, { } on both or neither side of the if.

> -	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
> -

This optimization wasn't mentioned in the changelog...

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Applied "spi: fsl-espi: remove unneeded variable in fsl_espi_do_trans" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: remove unneeded variable in fsl_espi_do_trans

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From dbd4fefb5b7cba19e3f89c097d93ad02049e38e3 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Thu, 25 Aug 2016 06:45:55 +0200
Subject: [PATCH] spi: fsl-espi: remove unneeded variable in fsl_espi_do_trans

Creating a message, adding one transfer, and then iterating over
all transfers in the message doesn't make sense.
We can simply use the original transfer directly.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 23 ++++++++---------------
 1 file changed, 8 insertions(+), 15 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 029017818685..f9ef50444447 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -258,11 +258,9 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct fsl_espi_transfer *espi_trans = tr;
-	struct spi_message message;
 	struct spi_transfer *t, *first, trans;
 	int status = 0;
 
-	spi_message_init(&message);
 	memset(&trans, 0, sizeof(trans));
 
 	first = list_first_entry(&m->transfers, struct spi_transfer,
@@ -284,23 +282,18 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	trans.len = espi_trans->len;
 	trans.tx_buf = espi_trans->tx_buf;
 	trans.rx_buf = espi_trans->rx_buf;
-	spi_message_add_tail(&trans, &message);
 
-	list_for_each_entry(t, &message.transfers, transfer_list) {
-		if (t->bits_per_word || t->speed_hz)
-			fsl_espi_setup_transfer(spi, t);
+	if (trans.bits_per_word || trans.speed_hz)
+		fsl_espi_setup_transfer(spi, &trans);
 
-		if (t->len)
-			status = fsl_espi_bufs(spi, t);
+	if (trans.len)
+		status = fsl_espi_bufs(spi, &trans);
 
-		if (status) {
-			status = -EMSGSIZE;
-			break;
-		}
+	if (status)
+		status = -EMSGSIZE;
 
-		if (t->delay_usecs)
-			udelay(t->delay_usecs);
-	}
+	if (trans.delay_usecs)
+		udelay(trans.delay_usecs);
 
 	espi_trans->status = status;
 	fsl_espi_setup_transfer(spi, NULL);
-- 
2.8.1

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Applied "spi: fsl-espi: add missing static declaration to fsl_espi_cpu_irq" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: add missing static declaration to fsl_espi_cpu_irq

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 10ed1e6d320ca01deef3bc36df91e04ecd69a60e Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Thu, 25 Aug 2016 06:45:16 +0200
Subject: [PATCH] spi: fsl-espi: add missing static declaration to
 fsl_espi_cpu_irq

Add missing static declaration to fsl_espi_cpu_irq.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 2c4714abdde7..029017818685 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -471,7 +471,7 @@ static void fsl_espi_cleanup(struct spi_device *spi)
 	spi_set_ctldata(spi, NULL);
 }
 
-void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
+static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 {
 	struct fsl_espi_reg *reg_base = mspi->reg_base;
 
-- 
2.8.1

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Applied "spi: fsl-espi: change return type of fsl_espi_cpu_bufs to void" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: change return type of fsl_espi_cpu_bufs to void

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From bbb55f6d6276b39a96b7bcd79f1159a1365bb318 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Thu, 25 Aug 2016 06:44:58 +0200
Subject: [PATCH] spi: fsl-espi: change return type of fsl_espi_cpu_bufs to
 void

fsl_espi_cpu_bufs always returns 0, so change the return type to void.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 02a55f50f03f..2c4714abdde7 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -197,7 +197,7 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
 	fsl_espi_change_mode(spi);
 }
 
-static int fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
+static void fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
 		unsigned int len)
 {
 	u32 word;
@@ -211,8 +211,6 @@ static int fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
 	/* transmit word */
 	word = mspi->get_tx(mspi);
 	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
-
-	return 0;
 }
 
 static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
@@ -239,9 +237,7 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
-	ret = fsl_espi_cpu_bufs(mpc8xxx_spi, t, len);
-	if (ret)
-		return ret;
+	fsl_espi_cpu_bufs(mpc8xxx_spi, t, len);
 
 	/* Won't hang up forever, SPI bus sometimes got lost interrupts... */
 	ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ);
-- 
2.8.1

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Applied "spi: fsl-espi: change return type of fsl_espi_setup_transfer to void" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: change return type of fsl_espi_setup_transfer to void

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From ea616ee220e70308cf33fa32496ae9c5ad18e190 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Thu, 25 Aug 2016 06:44:42 +0200
Subject: [PATCH] spi: fsl-espi: change return type of fsl_espi_setup_transfer
 to void

fsl_espi_setup_transfer always returns 0, so change the return type
to void.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index d95fdd0632e4..02a55f50f03f 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -130,7 +130,7 @@ static u32 fsl_espi_tx_buf_lsb(struct mpc8xxx_spi *mpc8xxx_spi)
 	return data;
 }
 
-static int fsl_espi_setup_transfer(struct spi_device *spi,
+static void fsl_espi_setup_transfer(struct spi_device *spi,
 					struct spi_transfer *t)
 {
 	struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
@@ -195,7 +195,6 @@ static int fsl_espi_setup_transfer(struct spi_device *spi,
 	cs->hw_mode |= CSMODE_PM(pm);
 
 	fsl_espi_change_mode(spi);
-	return 0;
 }
 
 static int fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
@@ -292,13 +291,8 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	spi_message_add_tail(&trans, &message);
 
 	list_for_each_entry(t, &message.transfers, transfer_list) {
-		if (t->bits_per_word || t->speed_hz) {
-			status = -EINVAL;
-
-			status = fsl_espi_setup_transfer(spi, t);
-			if (status < 0)
-				break;
-		}
+		if (t->bits_per_word || t->speed_hz)
+			fsl_espi_setup_transfer(spi, t);
 
 		if (t->len)
 			status = fsl_espi_bufs(spi, t);
@@ -425,7 +419,6 @@ static int fsl_espi_setup(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mpc8xxx_spi;
 	struct fsl_espi_reg *reg_base;
-	int retval;
 	u32 hw_mode;
 	u32 loop_mode;
 	struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
@@ -466,15 +459,11 @@ static int fsl_espi_setup(struct spi_device *spi)
 		loop_mode |= SPMODE_LOOP;
 	mpc8xxx_spi_write_reg(&reg_base->mode, loop_mode);
 
-	retval = fsl_espi_setup_transfer(spi, NULL);
+	fsl_espi_setup_transfer(spi, NULL);
 
 	pm_runtime_mark_last_busy(mpc8xxx_spi->dev);
 	pm_runtime_put_autosuspend(mpc8xxx_spi->dev);
 
-	if (retval < 0) {
-		cs->hw_mode = hw_mode; /* Restore settings */
-		return retval;
-	}
 	return 0;
 }
 
-- 
2.8.1

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Applied "spi: fsl-espi: dont include irq.h" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: dont include irq.h

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 6bdf03b30ed0ac72d309fe22aed8101f4cc6a2df Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Thu, 25 Aug 2016 06:43:17 +0200
Subject: [PATCH] spi: fsl-espi: dont include irq.h

irq.h isn't needed and it even shouldn't be included, see comment
at the beginning of this header file.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 96a2442c1623..d95fdd0632e4 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -12,7 +12,6 @@
 #include <linux/err.h>
 #include <linux/fsl_devices.h>
 #include <linux/interrupt.h>
-#include <linux/irq.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/of.h>
-- 
2.8.1

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[PATCH v2 02/23] spi: fsl-espi: remove unused elements n_rx and n_tx in struct fsl_espi_transfer

[Heiner Kallweit]

Both elements are not used, so remove them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- switch order of patches 2 and 3 to do the trivial changes first
---
 drivers/spi/spi-fsl-espi.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index f9ef504..a9004fe 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -41,8 +41,6 @@ struct fsl_espi_transfer {
 	const void *tx_buf;
 	void *rx_buf;
 	unsigned len;
-	unsigned n_tx;
-	unsigned n_rx;
 	unsigned actual_length;
 	int status;
 };
@@ -371,24 +369,16 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 {
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
-	unsigned int n_tx = 0;
-	unsigned int n_rx = 0;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf)
-			n_tx += t->len;
-		if (t->rx_buf) {
-			n_rx += t->len;
+		if (t->rx_buf)
 			rx_buf = t->rx_buf;
-		}
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
 	}
 
-	espi_trans.n_tx = n_tx;
-	espi_trans.n_rx = n_rx;
 	espi_trans.len = xfer_len;
 	espi_trans.actual_length = 0;
 	espi_trans.status = 0;
-- 
2.9.2


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[PATCH v2 03/23] spi: fsl-espi: pre-allocate message buffer

[Heiner Kallweit]

Currently the driver allocates a 64kb buffer with each single message.
On systems with little and fragmented memory this can result in
memory allocation errors. Solve this by pre-allocating a buffer.

This patch was developed in OpenWRT long ago, however it never
made it upstream. Author: Gabor Juhos <juhosg-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>

I slightly modified the original patch to re-initialize the buffer
at the beginning of each transfer.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- changed order of patches 2 and 3 to do the trivial changes first
- fixed coding style issue
- fixed commit message
---
 drivers/spi/spi-fsl-espi.c | 41 ++++++++++++++++++-----------------------
 drivers/spi/spi-fsl-lib.h  |  1 +
 2 files changed, 19 insertions(+), 23 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index a9004fe..a3a75ae 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -300,57 +300,44 @@ static void fsl_espi_do_trans(struct spi_message *m,
 static void fsl_espi_cmd_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_transfer *t;
-	u8 *local_buf;
 	int i = 0;
 	struct fsl_espi_transfer *espi_trans = trans;
 
-	local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!local_buf) {
-		espi_trans->status = -ENOMEM;
-		return;
-	}
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf) {
-			memcpy(local_buf + i, t->tx_buf, t->len);
+			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
 			i += t->len;
 		}
 	}
 
-	espi_trans->tx_buf = local_buf;
-	espi_trans->rx_buf = local_buf;
+	espi_trans->tx_buf = mspi->local_buf;
+	espi_trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, espi_trans);
 
 	espi_trans->actual_length = espi_trans->len;
-	kfree(local_buf);
 }
 
 static void fsl_espi_rw_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_transfer *t;
-	u8 *local_buf;
 	unsigned int tx_only = 0;
 	int i = 0;
 
-	local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!local_buf) {
-		trans->status = -ENOMEM;
-		return;
-	}
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf) {
-			memcpy(local_buf + i, t->tx_buf, t->len);
+			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
 			i += t->len;
 			if (!t->rx_buf)
 				tx_only += t->len;
 		}
 	}
 
-	trans->tx_buf = local_buf;
-	trans->rx_buf = local_buf;
+	trans->tx_buf = mspi->local_buf;
+	trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, trans);
 
 	if (!trans->status) {
@@ -360,18 +347,19 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 			       trans->len - tx_only);
 		trans->actual_length += trans->len;
 	}
-
-	kfree(local_buf);
 }
 
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
+	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
+
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
@@ -617,6 +605,13 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
 
 	mpc8xxx_spi = spi_master_get_devdata(master);
 
+	mpc8xxx_spi->local_buf =
+		devm_kmalloc(dev, SPCOM_TRANLEN_MAX, GFP_KERNEL);
+	if (!mpc8xxx_spi->local_buf) {
+		ret = -ENOMEM;
+		goto err_probe;
+	}
+
 	mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
 	if (IS_ERR(mpc8xxx_spi->reg_base)) {
 		ret = PTR_ERR(mpc8xxx_spi->reg_base);
diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h
index 84f5dcb..065b9db 100644
--- a/drivers/spi/spi-fsl-lib.h
+++ b/drivers/spi/spi-fsl-lib.h
@@ -30,6 +30,7 @@ struct mpc8xxx_spi {
 	void *rx;
 #if IS_ENABLED(CONFIG_SPI_FSL_ESPI)
 	int len;
+	u8 *local_buf;
 #endif
 
 	int subblock;
-- 
2.9.2


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[PATCH v2 08/23] spi: fsl-espi: factor out filling the local buffer

[Heiner Kallweit]

Better structure the code by factoring out filling the local buffer.

In addition don't initialize the complete local buffer at the
beginning of fsl_espi_do_one_msg. Instead move initialization of
those parts of the local buffer to be used for transfers w/o tx_buf
to fsl_espi_copy_to_buf.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- fixed coding style issue
- improved commit message
---
 drivers/spi/spi-fsl-espi.c | 46 ++++++++++++++++++++++++----------------------
 1 file changed, 24 insertions(+), 22 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index a3a75ae..c0023c0 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -85,6 +85,27 @@ struct fsl_espi_transfer {
 
 #define AUTOSUSPEND_TIMEOUT 2000
 
+static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
+					 struct mpc8xxx_spi *mspi)
+{
+	unsigned int tx_only = 0;
+	struct spi_transfer *t;
+	u8 *buf = mspi->local_buf;
+
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (t->tx_buf) {
+			memcpy(buf, t->tx_buf, t->len);
+			if (!t->rx_buf)
+				tx_only += t->len;
+		} else {
+			memset(buf, 0, t->len);
+		}
+		buf += t->len;
+	}
+
+	return tx_only;
+}
+
 static void fsl_espi_change_mode(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@@ -301,16 +322,9 @@ static void fsl_espi_cmd_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct spi_transfer *t;
-	int i = 0;
 	struct fsl_espi_transfer *espi_trans = trans;
 
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
-			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
-			i += t->len;
-		}
-	}
+	fsl_espi_copy_to_buf(m, mspi);
 
 	espi_trans->tx_buf = mspi->local_buf;
 	espi_trans->rx_buf = mspi->local_buf;
@@ -323,18 +337,9 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct spi_transfer *t;
-	unsigned int tx_only = 0;
-	int i = 0;
+	unsigned int tx_only;
 
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
-			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
-			i += t->len;
-			if (!t->rx_buf)
-				tx_only += t->len;
-		}
-	}
+	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
 	trans->tx_buf = mspi->local_buf;
 	trans->rx_buf = mspi->local_buf;
@@ -352,14 +357,11 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
-	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
-- 
2.9.2


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[PATCH v2 09/23] spi: fsl-espi: simplify fsl_espi_setup_transfer

[Heiner Kallweit]

Simplify fsl_espi_setup_transfer a little.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- changed order of patches to do trivial changes first
  (was patch 21 of the series before)
---
 drivers/spi/spi-fsl-espi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index c0023c0..51696a6 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -187,12 +187,10 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
 	mpc8xxx_spi->get_rx = cs->get_rx;
 	mpc8xxx_spi->get_tx = cs->get_tx;
 
-	bits_per_word = bits_per_word - 1;
-
 	/* mask out bits we are going to set */
 	cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF));
 
-	cs->hw_mode |= CSMODE_LEN(bits_per_word);
+	cs->hw_mode |= CSMODE_LEN(bits_per_word - 1);
 
 	if ((mpc8xxx_spi->spibrg / hz) > 64) {
 		cs->hw_mode |= CSMODE_DIV16;
-- 
2.9.2


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[PATCH v2 10/23] spi: fsl-espi: remove unneeded check in fsl_espi_do_trans

[Heiner Kallweit]

SPI core takes care that both values are always populated.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- switch order of patches to do trivial changes first
  (was patch 14 of the series before)
---
 drivers/spi/spi-fsl-espi.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 51696a6..8e6ef9b 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -300,8 +300,7 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	trans.tx_buf = espi_trans->tx_buf;
 	trans.rx_buf = espi_trans->rx_buf;
 
-	if (trans.bits_per_word || trans.speed_hz)
-		fsl_espi_setup_transfer(spi, &trans);
+	fsl_espi_setup_transfer(spi, &trans);
 
 	if (trans.len)
 		status = fsl_espi_bufs(spi, &trans);
-- 
2.9.2


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[PATCH v2 11/23] spi: fsl-espi: remove element status from struct fsl_espi_transfer

[Heiner Kallweit]

Use the return values of the functions in the call chain to transport
status information instead of using an element in struct
fsl_espi_transfer for this.

This is more in line with the general approach how to handle status
information and is one step further to eventually get rid of
struct fsl_espi_transfer completely.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 47 +++++++++++++++++++++++++---------------------
 1 file changed, 26 insertions(+), 21 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8e6ef9b..5f01b65 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -42,7 +42,6 @@ struct fsl_espi_transfer {
 	void *rx_buf;
 	unsigned len;
 	unsigned actual_length;
-	int status;
 };
 
 /* eSPI Controller mode register definitions */
@@ -269,14 +268,14 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count;
 }
 
-static void fsl_espi_do_trans(struct spi_message *m,
-				struct fsl_espi_transfer *tr)
+static int fsl_espi_do_trans(struct spi_message *m,
+			     struct fsl_espi_transfer *tr)
 {
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct fsl_espi_transfer *espi_trans = tr;
 	struct spi_transfer *t, *first, trans;
-	int status = 0;
+	int ret = 0;
 
 	memset(&trans, 0, sizeof(trans));
 
@@ -285,10 +284,9 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if ((first->bits_per_word != t->bits_per_word) ||
 			(first->speed_hz != t->speed_hz)) {
-			espi_trans->status = -EINVAL;
 			dev_err(mspi->dev,
 				"bits_per_word/speed_hz should be same for the same SPI transfer\n");
-			return;
+			return -EINVAL;
 		}
 
 		trans.speed_hz = t->speed_hz;
@@ -303,52 +301,59 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	fsl_espi_setup_transfer(spi, &trans);
 
 	if (trans.len)
-		status = fsl_espi_bufs(spi, &trans);
+		ret = fsl_espi_bufs(spi, &trans);
 
-	if (status)
-		status = -EMSGSIZE;
+	if (ret)
+		ret = -EMSGSIZE;
 
 	if (trans.delay_usecs)
 		udelay(trans.delay_usecs);
 
-	espi_trans->status = status;
 	fsl_espi_setup_transfer(spi, NULL);
+
+	return ret;
 }
 
-static void fsl_espi_cmd_trans(struct spi_message *m,
-				struct fsl_espi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_cmd_trans(struct spi_message *m,
+			      struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct fsl_espi_transfer *espi_trans = trans;
+	int ret;
 
 	fsl_espi_copy_to_buf(m, mspi);
 
 	espi_trans->tx_buf = mspi->local_buf;
 	espi_trans->rx_buf = mspi->local_buf;
-	fsl_espi_do_trans(m, espi_trans);
+	ret = fsl_espi_do_trans(m, espi_trans);
 
 	espi_trans->actual_length = espi_trans->len;
+
+	return ret;
 }
 
-static void fsl_espi_rw_trans(struct spi_message *m,
-				struct fsl_espi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_rw_trans(struct spi_message *m,
+			     struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
+	int ret;
 
 	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
 	trans->tx_buf = mspi->local_buf;
 	trans->rx_buf = mspi->local_buf;
-	fsl_espi_do_trans(m, trans);
+	ret = fsl_espi_do_trans(m, trans);
 
-	if (!trans->status) {
+	if (!ret) {
 		/* If there is at least one RX byte then copy it to rx_buff */
 		if (trans->len > tx_only)
 			memcpy(rx_buff, trans->rx_buf + tx_only,
 			       trans->len - tx_only);
 		trans->actual_length += trans->len;
 	}
+
+	return ret;
 }
 
 static int fsl_espi_do_one_msg(struct spi_master *master,
@@ -358,6 +363,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
+	int ret;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
@@ -368,15 +374,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 
 	espi_trans.len = xfer_len;
 	espi_trans.actual_length = 0;
-	espi_trans.status = 0;
 
 	if (!rx_buf)
-		fsl_espi_cmd_trans(m, &espi_trans, NULL);
+		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
 	else
-		fsl_espi_rw_trans(m, &espi_trans, rx_buf);
+		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
 	m->actual_length = espi_trans.actual_length;
-	m->status = espi_trans.status;
+	m->status = ret;
 	spi_finalize_current_message(master);
 	return 0;
 }
-- 
2.9.2


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[PATCH v2 12/23] spi: fsl-espi: fix status handling in fsl_espi_do_one_msg

[Heiner Kallweit]

If an error occurred during message handling return this error instead
of always returning 0 and align the code with the generic
implementation in spi_transfer_one_message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 5f01b65..6b60f7b 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -381,9 +381,12 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
 	m->actual_length = espi_trans.actual_length;
-	m->status = ret;
+	if (m->status == -EINPROGRESS)
+		m->status = ret;
+
 	spi_finalize_current_message(master);
-	return 0;
+
+	return ret;
 }
 
 static int fsl_espi_setup(struct spi_device *spi)
-- 
2.9.2


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[PATCH v2 13/23] spi: fsl-espi: remove element actual_length from struct fsl_espi_trans

[Heiner Kallweit]

If an error occurs during processing the message, then we don't have
to populate the actual_length element of struct message.
So we can get rid of element actual_length in struct
fsl_espi_transfer.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 6b60f7b..726d5fd 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -41,7 +41,6 @@ struct fsl_espi_transfer {
 	const void *tx_buf;
 	void *rx_buf;
 	unsigned len;
-	unsigned actual_length;
 };
 
 /* eSPI Controller mode register definitions */
@@ -327,8 +326,6 @@ static int fsl_espi_cmd_trans(struct spi_message *m,
 	espi_trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, espi_trans);
 
-	espi_trans->actual_length = espi_trans->len;
-
 	return ret;
 }
 
@@ -350,7 +347,6 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 		if (trans->len > tx_only)
 			memcpy(rx_buff, trans->rx_buf + tx_only,
 			       trans->len - tx_only);
-		trans->actual_length += trans->len;
 	}
 
 	return ret;
@@ -373,14 +369,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	}
 
 	espi_trans.len = xfer_len;
-	espi_trans.actual_length = 0;
 
 	if (!rx_buf)
 		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
 	else
 		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
-	m->actual_length = espi_trans.actual_length;
+	m->actual_length = ret ? 0 : espi_trans.len;
+
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
 
-- 
2.9.2


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[PATCH v2 14/23] spi: fsl-espi: eliminate struct fsl_espi_transfer

[Heiner Kallweit]

The remaining elements of struct fsl_espi_transfer are part of struct
spi_transfer anyway. So we can get rid of struct fsl_espi_transfer
and use a struct spi_transfer only.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 56 +++++++++++++++++-----------------------------
 1 file changed, 20 insertions(+), 36 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 726d5fd..8554f18 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -37,12 +37,6 @@ struct fsl_espi_reg {
 	__be32 csmode[4];	/* 0x020 - 0x02c eSPI cs mode register */
 };
 
-struct fsl_espi_transfer {
-	const void *tx_buf;
-	void *rx_buf;
-	unsigned len;
-};
-
 /* eSPI Controller mode register definitions */
 #define SPMODE_ENABLE		(1 << 31)
 #define SPMODE_LOOP		(1 << 30)
@@ -267,17 +261,13 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count;
 }
 
-static int fsl_espi_do_trans(struct spi_message *m,
-			     struct fsl_espi_transfer *tr)
+static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
-	struct fsl_espi_transfer *espi_trans = tr;
-	struct spi_transfer *t, *first, trans;
+	struct spi_transfer *t, *first;
 	int ret = 0;
 
-	memset(&trans, 0, sizeof(trans));
-
 	first = list_first_entry(&m->transfers, struct spi_transfer,
 			transfer_list);
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -288,25 +278,21 @@ static int fsl_espi_do_trans(struct spi_message *m,
 			return -EINVAL;
 		}
 
-		trans.speed_hz = t->speed_hz;
-		trans.bits_per_word = t->bits_per_word;
-		trans.delay_usecs = max(first->delay_usecs, t->delay_usecs);
+		trans->speed_hz = t->speed_hz;
+		trans->bits_per_word = t->bits_per_word;
+		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
 	}
 
-	trans.len = espi_trans->len;
-	trans.tx_buf = espi_trans->tx_buf;
-	trans.rx_buf = espi_trans->rx_buf;
-
-	fsl_espi_setup_transfer(spi, &trans);
+	fsl_espi_setup_transfer(spi, trans);
 
-	if (trans.len)
-		ret = fsl_espi_bufs(spi, &trans);
+	if (trans->len)
+		ret = fsl_espi_bufs(spi, trans);
 
 	if (ret)
 		ret = -EMSGSIZE;
 
-	if (trans.delay_usecs)
-		udelay(trans.delay_usecs);
+	if (trans->delay_usecs)
+		udelay(trans->delay_usecs);
 
 	fsl_espi_setup_transfer(spi, NULL);
 
@@ -314,23 +300,22 @@ static int fsl_espi_do_trans(struct spi_message *m,
 }
 
 static int fsl_espi_cmd_trans(struct spi_message *m,
-			      struct fsl_espi_transfer *trans, u8 *rx_buff)
+			      struct spi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct fsl_espi_transfer *espi_trans = trans;
 	int ret;
 
 	fsl_espi_copy_to_buf(m, mspi);
 
-	espi_trans->tx_buf = mspi->local_buf;
-	espi_trans->rx_buf = mspi->local_buf;
-	ret = fsl_espi_do_trans(m, espi_trans);
+	trans->tx_buf = mspi->local_buf;
+	trans->rx_buf = mspi->local_buf;
+	ret = fsl_espi_do_trans(m, trans);
 
 	return ret;
 }
 
 static int fsl_espi_rw_trans(struct spi_message *m,
-			     struct fsl_espi_transfer *trans, u8 *rx_buff)
+			     struct spi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
@@ -355,10 +340,9 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
-	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
-	struct fsl_espi_transfer espi_trans;
+	struct spi_transfer *t, trans = {};
 	int ret;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -368,14 +352,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			xfer_len += t->len;
 	}
 
-	espi_trans.len = xfer_len;
+	trans.len = xfer_len;
 
 	if (!rx_buf)
-		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
+		ret = fsl_espi_cmd_trans(m, &trans, NULL);
 	else
-		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
+		ret = fsl_espi_rw_trans(m, &trans, rx_buf);
 
-	m->actual_length = ret ? 0 : espi_trans.len;
+	m->actual_length = ret ? 0 : trans.len;
 
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
-- 
2.9.2


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[PATCH v2 15/23] spi: fsl-espi: merge fsl_espi_cmd_trans and fsl_espi_rw_trans

[Heiner Kallweit]

fsl_espi_cmd_trans and fsl_espi_rw_trans share most of the code so
we can merge them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 33 ++++++---------------------------
 1 file changed, 6 insertions(+), 27 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8554f18..f8a6dd1 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -299,23 +299,8 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	return ret;
 }
 
-static int fsl_espi_cmd_trans(struct spi_message *m,
-			      struct spi_transfer *trans, u8 *rx_buff)
-{
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	int ret;
-
-	fsl_espi_copy_to_buf(m, mspi);
-
-	trans->tx_buf = mspi->local_buf;
-	trans->rx_buf = mspi->local_buf;
-	ret = fsl_espi_do_trans(m, trans);
-
-	return ret;
-}
-
-static int fsl_espi_rw_trans(struct spi_message *m,
-			     struct spi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
+			  u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
@@ -327,12 +312,9 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 	trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, trans);
 
-	if (!ret) {
-		/* If there is at least one RX byte then copy it to rx_buff */
-		if (trans->len > tx_only)
-			memcpy(rx_buff, trans->rx_buf + tx_only,
-			       trans->len - tx_only);
-	}
+	/* If there is at least one RX byte then copy it to rx_buff */
+	if (!ret && rx_buff && trans->len > tx_only)
+		memcpy(rx_buff, trans->rx_buf + tx_only, trans->len - tx_only);
 
 	return ret;
 }
@@ -354,10 +336,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 
 	trans.len = xfer_len;
 
-	if (!rx_buf)
-		ret = fsl_espi_cmd_trans(m, &trans, NULL);
-	else
-		ret = fsl_espi_rw_trans(m, &trans, rx_buf);
+	ret = fsl_espi_trans(m, &trans, rx_buf);
 
 	m->actual_length = ret ? 0 : trans.len;
 
-- 
2.9.2


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[PATCH v2 16/23] spi: fsl-espi: improve return value handling in fsl_espi_bufs

[Heiner Kallweit]

Return a proper status code from fsl_espi_bufs instead of returning
the number of remaining words and let the caller evaluate it.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index f8a6dd1..8d6a570 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -258,7 +258,7 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	/* disable rx ints */
 	mpc8xxx_spi_write_reg(&reg_base->mask, 0);
 
-	return mpc8xxx_spi->count;
+	return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0;
 }
 
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
@@ -288,9 +288,6 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	if (trans->len)
 		ret = fsl_espi_bufs(spi, trans);
 
-	if (ret)
-		ret = -EMSGSIZE;
-
 	if (trans->delay_usecs)
 		udelay(trans->delay_usecs);
 
-- 
2.9.2


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[PATCH v2 17/23] spi: fsl-espi: merge fsl_espi_bufs and fsl_espi_cpu_bufs

[Heiner Kallweit]

fsl_espi_bufs and fsl_espi_cpu_bufs are very small that we can merge them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 27 ++++++++-------------------
 1 file changed, 8 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8d6a570..190ca5c 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -206,31 +206,15 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
 	fsl_espi_change_mode(spi);
 }
 
-static void fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
-		unsigned int len)
-{
-	u32 word;
-	struct fsl_espi_reg *reg_base = mspi->reg_base;
-
-	mspi->count = len;
-
-	/* enable rx ints */
-	mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
-
-	/* transmit word */
-	word = mspi->get_tx(mspi);
-	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
-}
-
 static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 {
 	struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
 	struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
-	unsigned int len = t->len;
+	u32 word;
 	int ret;
 
 	mpc8xxx_spi->len = t->len;
-	len = roundup(len, 4) / 4;
+	mpc8xxx_spi->count = roundup(t->len, 4) / 4;
 
 	mpc8xxx_spi->tx = t->tx_buf;
 	mpc8xxx_spi->rx = t->rx_buf;
@@ -246,7 +230,12 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
-	fsl_espi_cpu_bufs(mpc8xxx_spi, t, len);
+	/* enable rx ints */
+	mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
+
+	/* transmit word */
+	word = mpc8xxx_spi->get_tx(mpc8xxx_spi);
+	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
 
 	/* Won't hang up forever, SPI bus sometimes got lost interrupts... */
 	ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ);
-- 
2.9.2


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[PATCH v2 18/23] spi: fsl-espi: improve the ISR frame

[Heiner Kallweit]

Improve the ISR frame:
- move resetting the event bits to the ISR frame
- change type of parameter irq to int
- make sure that the event bits match at least one bit in the
  interrupt mask register

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 190ca5c..534dc14 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -451,17 +451,11 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 				&reg_base->event)) & SPIE_NF), 1000, 0);
 		if (!ret) {
 			dev_err(mspi->dev, "tired waiting for SPIE_NF\n");
-
-			/* Clear the SPIE bits */
-			mpc8xxx_spi_write_reg(&reg_base->event, events);
 			complete(&mspi->done);
 			return;
 		}
 	}
 
-	/* Clear the events */
-	mpc8xxx_spi_write_reg(&reg_base->event, events);
-
 	mspi->count -= 1;
 	if (mspi->count) {
 		u32 word = mspi->get_tx(mspi);
@@ -472,23 +466,26 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 	}
 }
 
-static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
+static irqreturn_t fsl_espi_irq(int irq, void *context_data)
 {
 	struct mpc8xxx_spi *mspi = context_data;
 	struct fsl_espi_reg *reg_base = mspi->reg_base;
-	irqreturn_t ret = IRQ_NONE;
-	u32 events;
+	u32 mask, events;
 
-	/* Get interrupt events(tx/rx) */
+	/* Get interrupt mask and events and check that irq belongs to us */
+	mask = mpc8xxx_spi_read_reg(&reg_base->mask);
 	events = mpc8xxx_spi_read_reg(&reg_base->event);
-	if (events)
-		ret = IRQ_HANDLED;
+	if (!(mask & events))
+		return IRQ_NONE;
 
 	dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events);
 
 	fsl_espi_cpu_irq(mspi, events);
 
-	return ret;
+	/* Clear the events */
+	mpc8xxx_spi_write_reg(&reg_base->event, events);
+
+	return IRQ_HANDLED;
 }
 
 #ifdef CONFIG_PM
-- 
2.9.2


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[PATCH v2 19/23] spi: fsl-espi: factor out initial message checking

[Heiner Kallweit]

Checking the message is currently done at diffrent places in the
driver. Factor it out to fsl_espi_check_message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 43 +++++++++++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 534dc14..a32bc3a 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -98,6 +98,30 @@ static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
 	return tx_only;
 }
 
+static int fsl_espi_check_message(struct spi_message *m)
+{
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
+	struct spi_transfer *t, *first;
+
+	if (m->frame_length > SPCOM_TRANLEN_MAX) {
+		dev_err(mspi->dev, "message too long, size is %u bytes\n",
+			m->frame_length);
+		return -EMSGSIZE;
+	}
+
+	first = list_first_entry(&m->transfers, struct spi_transfer,
+				 transfer_list);
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (first->bits_per_word != t->bits_per_word ||
+		    first->speed_hz != t->speed_hz) {
+			dev_err(mspi->dev, "bits_per_word/speed_hz should be the same for all transfers\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
 static void fsl_espi_change_mode(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@@ -222,11 +246,6 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	reinit_completion(&mpc8xxx_spi->done);
 
 	/* Set SPCOM[CS] and SPCOM[TRANLEN] field */
-	if (t->len > SPCOM_TRANLEN_MAX) {
-		dev_err(mpc8xxx_spi->dev, "Transaction length (%d)"
-				" beyond the SPCOM[TRANLEN] field\n", t->len);
-		return -EINVAL;
-	}
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
@@ -253,20 +272,12 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct spi_transfer *t, *first;
 	int ret = 0;
 
 	first = list_first_entry(&m->transfers, struct spi_transfer,
 			transfer_list);
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if ((first->bits_per_word != t->bits_per_word) ||
-			(first->speed_hz != t->speed_hz)) {
-			dev_err(mspi->dev,
-				"bits_per_word/speed_hz should be same for the same SPI transfer\n");
-			return -EINVAL;
-		}
-
 		trans->speed_hz = t->speed_hz;
 		trans->bits_per_word = t->bits_per_word;
 		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
@@ -313,6 +324,10 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	struct spi_transfer *t, trans = {};
 	int ret;
 
+	ret = fsl_espi_check_message(m);
+	if (ret)
+		goto out;
+
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
@@ -325,7 +340,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	ret = fsl_espi_trans(m, &trans, rx_buf);
 
 	m->actual_length = ret ? 0 : trans.len;
-
+out:
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
 
-- 
2.9.2


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[PATCH v2 20/23] spi: fsl-espi: centralize populating struct spi_transfer

[Heiner Kallweit]

Better structure the code by population all elements of struct
spi_transfer in one place.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index a32bc3a..79c89bf 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -272,17 +272,8 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
-	struct spi_transfer *t, *first;
 	int ret = 0;
 
-	first = list_first_entry(&m->transfers, struct spi_transfer,
-			transfer_list);
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		trans->speed_hz = t->speed_hz;
-		trans->bits_per_word = t->bits_per_word;
-		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
-	}
-
 	fsl_espi_setup_transfer(spi, trans);
 
 	if (trans->len)
@@ -305,8 +296,6 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
 
 	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
-	trans->tx_buf = mspi->local_buf;
-	trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, trans);
 
 	/* If there is at least one RX byte then copy it to rx_buff */
@@ -319,8 +308,9 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	u8 *rx_buf = NULL;
-	unsigned int xfer_len = 0;
+	unsigned int delay_usecs = 0, xfer_len = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
 
@@ -333,9 +323,19 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			rx_buf = t->rx_buf;
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
+		if (t->delay_usecs > delay_usecs)
+			delay_usecs = t->delay_usecs;
 	}
 
+	t = list_first_entry(&m->transfers, struct spi_transfer,
+			     transfer_list);
+
 	trans.len = xfer_len;
+	trans.speed_hz = t->speed_hz;
+	trans.bits_per_word = t->bits_per_word;
+	trans.delay_usecs = delay_usecs;
+	trans.tx_buf = mspi->local_buf;
+	trans.rx_buf = mspi->local_buf;
 
 	ret = fsl_espi_trans(m, &trans, rx_buf);
 
-- 
2.9.2


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[PATCH v2 21/23] spi: fsl-espi: factor out handling of read data

[Heiner Kallweit]

Factor out copying read data to the read buffers in the original
message to a new function fsl_espi_copy_from_buf.
This also allows to simplify fsl_espi_copy_to_buf.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 41 +++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 20 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 79c89bf..88935a3 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -77,25 +77,32 @@ struct fsl_espi_reg {
 
 #define AUTOSUSPEND_TIMEOUT 2000
 
-static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
-					 struct mpc8xxx_spi *mspi)
+static void fsl_espi_copy_to_buf(struct spi_message *m,
+				 struct mpc8xxx_spi *mspi)
 {
-	unsigned int tx_only = 0;
 	struct spi_transfer *t;
 	u8 *buf = mspi->local_buf;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
+		if (t->tx_buf)
 			memcpy(buf, t->tx_buf, t->len);
-			if (!t->rx_buf)
-				tx_only += t->len;
-		} else {
+		else
 			memset(buf, 0, t->len);
-		}
 		buf += t->len;
 	}
+}
+
+static void fsl_espi_copy_from_buf(struct spi_message *m,
+				   struct mpc8xxx_spi *mspi)
+{
+	struct spi_transfer *t;
+	u8 *buf = mspi->local_buf;
 
-	return tx_only;
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (t->rx_buf)
+			memcpy(t->rx_buf, buf, t->len);
+		buf += t->len;
+	}
 }
 
 static int fsl_espi_check_message(struct spi_message *m)
@@ -287,20 +294,17 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	return ret;
 }
 
-static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
-			  u8 *rx_buff)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	unsigned int tx_only;
 	int ret;
 
-	tx_only = fsl_espi_copy_to_buf(m, mspi);
+	fsl_espi_copy_to_buf(m, mspi);
 
 	ret = fsl_espi_do_trans(m, trans);
 
-	/* If there is at least one RX byte then copy it to rx_buff */
-	if (!ret && rx_buff && trans->len > tx_only)
-		memcpy(rx_buff, trans->rx_buf + tx_only, trans->len - tx_only);
+	if (!ret)
+		fsl_espi_copy_from_buf(m, mspi);
 
 	return ret;
 }
@@ -309,7 +313,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	u8 *rx_buf = NULL;
 	unsigned int delay_usecs = 0, xfer_len = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
@@ -319,8 +322,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		goto out;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->rx_buf)
-			rx_buf = t->rx_buf;
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
 		if (t->delay_usecs > delay_usecs)
@@ -337,7 +338,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	trans.tx_buf = mspi->local_buf;
 	trans.rx_buf = mspi->local_buf;
 
-	ret = fsl_espi_trans(m, &trans, rx_buf);
+	ret = fsl_espi_trans(m, &trans);
 
 	m->actual_length = ret ? 0 : trans.len;
 out:
-- 
2.9.2


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[PATCH v2 22/23] spi: fsl-espi: improve message length handling

[Heiner Kallweit]

Move checking for a zero-length message up in the call chain and
use m->frame_length instead of re-calculating the overall length
of all transfers in the message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 88935a3..84355bb 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -283,8 +283,7 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 
 	fsl_espi_setup_transfer(spi, trans);
 
-	if (trans->len)
-		ret = fsl_espi_bufs(spi, trans);
+	ret = fsl_espi_bufs(spi, trans);
 
 	if (trans->delay_usecs)
 		udelay(trans->delay_usecs);
@@ -313,7 +312,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	unsigned int delay_usecs = 0, xfer_len = 0;
+	unsigned int delay_usecs = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
 
@@ -322,8 +321,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		goto out;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if ((t->tx_buf) || (t->rx_buf))
-			xfer_len += t->len;
 		if (t->delay_usecs > delay_usecs)
 			delay_usecs = t->delay_usecs;
 	}
@@ -331,14 +328,15 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	t = list_first_entry(&m->transfers, struct spi_transfer,
 			     transfer_list);
 
-	trans.len = xfer_len;
+	trans.len = m->frame_length;
 	trans.speed_hz = t->speed_hz;
 	trans.bits_per_word = t->bits_per_word;
 	trans.delay_usecs = delay_usecs;
 	trans.tx_buf = mspi->local_buf;
 	trans.rx_buf = mspi->local_buf;
 
-	ret = fsl_espi_trans(m, &trans);
+	if (trans.len)
+		ret = fsl_espi_trans(m, &trans);
 
 	m->actual_length = ret ? 0 : trans.len;
 out:
-- 
2.9.2


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[PATCH v2 23/23] spi: fsl-espi: merge fsl_espi_trans and fsl_espi_do_trans

[Heiner Kallweit]

Merge both functions to reduce source code size and improve
readability.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 84355bb..f7d682f 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -276,11 +276,13 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0;
 }
 
-static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_device *spi = m->spi;
-	int ret = 0;
+	int ret;
 
+	fsl_espi_copy_to_buf(m, mspi);
 	fsl_espi_setup_transfer(spi, trans);
 
 	ret = fsl_espi_bufs(spi, trans);
@@ -290,18 +292,6 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 
 	fsl_espi_setup_transfer(spi, NULL);
 
-	return ret;
-}
-
-static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
-{
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	int ret;
-
-	fsl_espi_copy_to_buf(m, mspi);
-
-	ret = fsl_espi_do_trans(m, trans);
-
 	if (!ret)
 		fsl_espi_copy_from_buf(m, mspi);
 
-- 
2.9.2


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Re: [PATCH v2 02/23] spi: fsl-espi: remove unused elements n_rx and n_tx in struct fsl_espi_transfer

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 243 bytes --]

On Fri, Sep 02, 2016 at 10:02:34PM +0200, Heiner Kallweit wrote:
> Both elements are not used, so remove them.

I'm missing a lot of patches from this series, at least the first one
but there's a bunch of others too.  Please check and resend.

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 455 bytes --]

Re: [PATCH v2 02/23] spi: fsl-espi: remove unused elements n_rx and n_tx in struct fsl_espi_transfer

[Heiner Kallweit]

Am 03.09.2016 um 02:09 schrieb Mark Brown:
> On Fri, Sep 02, 2016 at 10:02:34PM +0200, Heiner Kallweit wrote:
>> Both elements are not used, so remove them.
> 
> I'm missing a lot of patches from this series, at least the first one
> but there's a bunch of others too.  Please check and resend.
> 
Patches 1 and 4-7 of the series you applied already. Yesterday I sent
a v2 of patches 2, 3 and about an hour later v2 of patches 8-23.
Based on your review comments it's mainly about reordering patches
(do trivial things first), smaller code style fixes, and mainly rebasing.
Maybe some issue with referencing the mails correctly?

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Re: [PATCH v2 02/23] spi: fsl-espi: remove unused elements n_rx and n_tx in struct fsl_espi_transfer

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 962 bytes --]

On Sat, Sep 03, 2016 at 11:04:29PM +0200, Heiner Kallweit wrote:
> Am 03.09.2016 um 02:09 schrieb Mark Brown:

> > I'm missing a lot of patches from this series, at least the first one
> > but there's a bunch of others too.  Please check and resend.

> Patches 1 and 4-7 of the series you applied already. Yesterday I sent
> a v2 of patches 2, 3 and about an hour later v2 of patches 8-23.

Patch numbering exists solely in order to sort the patches within the
series you're sending.  If you've previously sent patches that's totally
irrelevant and confuses things, just number the patches in order without
gaps.

> Based on your review comments it's mainly about reordering patches
> (do trivial things first), smaller code style fixes, and mainly rebasing.
> Maybe some issue with referencing the mails correctly?

Not sure what you mean here but if you're trying to send the patches in
reply to their versions in the earlier series that also confuses things.

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 455 bytes --]

Re: [PATCH v2 02/23] spi: fsl-espi: remove unused elements n_rx and n_tx in struct fsl_espi_transfer

[Heiner Kallweit]

Am 03.09.2016 um 23:59 schrieb Mark Brown:
> On Sat, Sep 03, 2016 at 11:04:29PM +0200, Heiner Kallweit wrote:
>> Am 03.09.2016 um 02:09 schrieb Mark Brown:
> 
>>> I'm missing a lot of patches from this series, at least the first one
>>> but there's a bunch of others too.  Please check and resend.
> 
>> Patches 1 and 4-7 of the series you applied already. Yesterday I sent
>> a v2 of patches 2, 3 and about an hour later v2 of patches 8-23.
> 
> Patch numbering exists solely in order to sort the patches within the
> series you're sending.  If you've previously sent patches that's totally
> irrelevant and confuses things, just number the patches in order without
> gaps.
> 
OK, so I'll resend the remaining 18 patches of the series with new numbering.

>> Based on your review comments it's mainly about reordering patches
>> (do trivial things first), smaller code style fixes, and mainly rebasing.
>> Maybe some issue with referencing the mails correctly?
> 
> Not sure what you mean here but if you're trying to send the patches in
> reply to their versions in the earlier series that also confuses things.
> 

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[PATCH v2 01/18] spi: fsl-espi: remove unused elements n_rx and n_tx in struct fsl_espi_transfer

[Heiner Kallweit]

Both elements are not used, so remove them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- switch order of patches to do the trivial changes first
---
 drivers/spi/spi-fsl-espi.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index f9ef504..a9004fe 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -41,8 +41,6 @@ struct fsl_espi_transfer {
 	const void *tx_buf;
 	void *rx_buf;
 	unsigned len;
-	unsigned n_tx;
-	unsigned n_rx;
 	unsigned actual_length;
 	int status;
 };
@@ -371,24 +369,16 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 {
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
-	unsigned int n_tx = 0;
-	unsigned int n_rx = 0;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf)
-			n_tx += t->len;
-		if (t->rx_buf) {
-			n_rx += t->len;
+		if (t->rx_buf)
 			rx_buf = t->rx_buf;
-		}
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
 	}
 
-	espi_trans.n_tx = n_tx;
-	espi_trans.n_rx = n_rx;
 	espi_trans.len = xfer_len;
 	espi_trans.actual_length = 0;
 	espi_trans.status = 0;
-- 
2.9.2


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[PATCH v2 02/18] spi: fsl-espi: simplify fsl_espi_setup_transfer

[Heiner Kallweit]

Simplify fsl_espi_setup_transfer a little.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- changed order of patches to do trivial changes first
---
 drivers/spi/spi-fsl-espi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index c0023c0..51696a6 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -187,12 +187,10 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
 	mpc8xxx_spi->get_rx = cs->get_rx;
 	mpc8xxx_spi->get_tx = cs->get_tx;
 
-	bits_per_word = bits_per_word - 1;
-
 	/* mask out bits we are going to set */
 	cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF));
 
-	cs->hw_mode |= CSMODE_LEN(bits_per_word);
+	cs->hw_mode |= CSMODE_LEN(bits_per_word - 1);
 
 	if ((mpc8xxx_spi->spibrg / hz) > 64) {
 		cs->hw_mode |= CSMODE_DIV16;
-- 
2.9.2


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[PATCH v2 03/18] spi: fsl-espi: remove unneeded check in fsl_espi_do_trans

[Heiner Kallweit]

SPI core takes care that both values are always populated.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- switch order of patches to do trivial changes first
---
 drivers/spi/spi-fsl-espi.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 51696a6..8e6ef9b 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -300,8 +300,7 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	trans.tx_buf = espi_trans->tx_buf;
 	trans.rx_buf = espi_trans->rx_buf;
 
-	if (trans.bits_per_word || trans.speed_hz)
-		fsl_espi_setup_transfer(spi, &trans);
+	fsl_espi_setup_transfer(spi, &trans);
 
 	if (trans.len)
 		status = fsl_espi_bufs(spi, &trans);
-- 
2.9.2


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[PATCH v2 04/18] spi: fsl-espi: pre-allocate message buffer

[Heiner Kallweit]

Currently the driver allocates a 64kb buffer with each single message.
On systems with little and fragmented memory this can result in
memory allocation errors. Solve this by pre-allocating a buffer.

This patch was developed in OpenWRT long ago, however it never
made it upstream. Author: Gabor Juhos <juhosg-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>

I slightly modified the original patch to re-initialize the buffer
at the beginning of each transfer.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- fixed coding style issue
- fixed commit message
---
 drivers/spi/spi-fsl-espi.c | 41 ++++++++++++++++++-----------------------
 drivers/spi/spi-fsl-lib.h  |  1 +
 2 files changed, 19 insertions(+), 23 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index a9004fe..a3a75ae 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -300,57 +300,44 @@ static void fsl_espi_do_trans(struct spi_message *m,
 static void fsl_espi_cmd_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_transfer *t;
-	u8 *local_buf;
 	int i = 0;
 	struct fsl_espi_transfer *espi_trans = trans;
 
-	local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!local_buf) {
-		espi_trans->status = -ENOMEM;
-		return;
-	}
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf) {
-			memcpy(local_buf + i, t->tx_buf, t->len);
+			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
 			i += t->len;
 		}
 	}
 
-	espi_trans->tx_buf = local_buf;
-	espi_trans->rx_buf = local_buf;
+	espi_trans->tx_buf = mspi->local_buf;
+	espi_trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, espi_trans);
 
 	espi_trans->actual_length = espi_trans->len;
-	kfree(local_buf);
 }
 
 static void fsl_espi_rw_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_transfer *t;
-	u8 *local_buf;
 	unsigned int tx_only = 0;
 	int i = 0;
 
-	local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!local_buf) {
-		trans->status = -ENOMEM;
-		return;
-	}
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf) {
-			memcpy(local_buf + i, t->tx_buf, t->len);
+			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
 			i += t->len;
 			if (!t->rx_buf)
 				tx_only += t->len;
 		}
 	}
 
-	trans->tx_buf = local_buf;
-	trans->rx_buf = local_buf;
+	trans->tx_buf = mspi->local_buf;
+	trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, trans);
 
 	if (!trans->status) {
@@ -360,18 +347,19 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 			       trans->len - tx_only);
 		trans->actual_length += trans->len;
 	}
-
-	kfree(local_buf);
 }
 
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
+	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
+
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
@@ -617,6 +605,13 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
 
 	mpc8xxx_spi = spi_master_get_devdata(master);
 
+	mpc8xxx_spi->local_buf =
+		devm_kmalloc(dev, SPCOM_TRANLEN_MAX, GFP_KERNEL);
+	if (!mpc8xxx_spi->local_buf) {
+		ret = -ENOMEM;
+		goto err_probe;
+	}
+
 	mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
 	if (IS_ERR(mpc8xxx_spi->reg_base)) {
 		ret = PTR_ERR(mpc8xxx_spi->reg_base);
diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h
index 84f5dcb..065b9db 100644
--- a/drivers/spi/spi-fsl-lib.h
+++ b/drivers/spi/spi-fsl-lib.h
@@ -30,6 +30,7 @@ struct mpc8xxx_spi {
 	void *rx;
 #if IS_ENABLED(CONFIG_SPI_FSL_ESPI)
 	int len;
+	u8 *local_buf;
 #endif
 
 	int subblock;
-- 
2.9.2


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[PATCH v2 05/18] spi: fsl-espi: factor out filling the local buffer

[Heiner Kallweit]

Better structure the code by factoring out filling the local buffer.

In addition don't initialize the complete local buffer at the
beginning of fsl_espi_do_one_msg. Instead move initialization of
those parts of the local buffer to be used for transfers w/o tx_buf
to fsl_espi_copy_to_buf.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- fixed coding style issue
- improved commit message
---
 drivers/spi/spi-fsl-espi.c | 46 ++++++++++++++++++++++++----------------------
 1 file changed, 24 insertions(+), 22 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index a3a75ae..c0023c0 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -85,6 +85,27 @@ struct fsl_espi_transfer {
 
 #define AUTOSUSPEND_TIMEOUT 2000
 
+static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
+					 struct mpc8xxx_spi *mspi)
+{
+	unsigned int tx_only = 0;
+	struct spi_transfer *t;
+	u8 *buf = mspi->local_buf;
+
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (t->tx_buf) {
+			memcpy(buf, t->tx_buf, t->len);
+			if (!t->rx_buf)
+				tx_only += t->len;
+		} else {
+			memset(buf, 0, t->len);
+		}
+		buf += t->len;
+	}
+
+	return tx_only;
+}
+
 static void fsl_espi_change_mode(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@@ -301,16 +322,9 @@ static void fsl_espi_cmd_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct spi_transfer *t;
-	int i = 0;
 	struct fsl_espi_transfer *espi_trans = trans;
 
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
-			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
-			i += t->len;
-		}
-	}
+	fsl_espi_copy_to_buf(m, mspi);
 
 	espi_trans->tx_buf = mspi->local_buf;
 	espi_trans->rx_buf = mspi->local_buf;
@@ -323,18 +337,9 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct spi_transfer *t;
-	unsigned int tx_only = 0;
-	int i = 0;
+	unsigned int tx_only;
 
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
-			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
-			i += t->len;
-			if (!t->rx_buf)
-				tx_only += t->len;
-		}
-	}
+	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
 	trans->tx_buf = mspi->local_buf;
 	trans->rx_buf = mspi->local_buf;
@@ -352,14 +357,11 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
-	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
-- 
2.9.2


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[PATCH v2 06/18] spi: fsl-espi: remove element status from struct fsl_espi_transfer

[Heiner Kallweit]

Use the return values of the functions in the call chain to transport
status information instead of using an element in struct
fsl_espi_transfer for this.

This is more in line with the general approach how to handle status
information and is one step further to eventually get rid of
struct fsl_espi_transfer completely.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 47 +++++++++++++++++++++++++---------------------
 1 file changed, 26 insertions(+), 21 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8e6ef9b..5f01b65 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -42,7 +42,6 @@ struct fsl_espi_transfer {
 	void *rx_buf;
 	unsigned len;
 	unsigned actual_length;
-	int status;
 };
 
 /* eSPI Controller mode register definitions */
@@ -269,14 +268,14 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count;
 }
 
-static void fsl_espi_do_trans(struct spi_message *m,
-				struct fsl_espi_transfer *tr)
+static int fsl_espi_do_trans(struct spi_message *m,
+			     struct fsl_espi_transfer *tr)
 {
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct fsl_espi_transfer *espi_trans = tr;
 	struct spi_transfer *t, *first, trans;
-	int status = 0;
+	int ret = 0;
 
 	memset(&trans, 0, sizeof(trans));
 
@@ -285,10 +284,9 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if ((first->bits_per_word != t->bits_per_word) ||
 			(first->speed_hz != t->speed_hz)) {
-			espi_trans->status = -EINVAL;
 			dev_err(mspi->dev,
 				"bits_per_word/speed_hz should be same for the same SPI transfer\n");
-			return;
+			return -EINVAL;
 		}
 
 		trans.speed_hz = t->speed_hz;
@@ -303,52 +301,59 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	fsl_espi_setup_transfer(spi, &trans);
 
 	if (trans.len)
-		status = fsl_espi_bufs(spi, &trans);
+		ret = fsl_espi_bufs(spi, &trans);
 
-	if (status)
-		status = -EMSGSIZE;
+	if (ret)
+		ret = -EMSGSIZE;
 
 	if (trans.delay_usecs)
 		udelay(trans.delay_usecs);
 
-	espi_trans->status = status;
 	fsl_espi_setup_transfer(spi, NULL);
+
+	return ret;
 }
 
-static void fsl_espi_cmd_trans(struct spi_message *m,
-				struct fsl_espi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_cmd_trans(struct spi_message *m,
+			      struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct fsl_espi_transfer *espi_trans = trans;
+	int ret;
 
 	fsl_espi_copy_to_buf(m, mspi);
 
 	espi_trans->tx_buf = mspi->local_buf;
 	espi_trans->rx_buf = mspi->local_buf;
-	fsl_espi_do_trans(m, espi_trans);
+	ret = fsl_espi_do_trans(m, espi_trans);
 
 	espi_trans->actual_length = espi_trans->len;
+
+	return ret;
 }
 
-static void fsl_espi_rw_trans(struct spi_message *m,
-				struct fsl_espi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_rw_trans(struct spi_message *m,
+			     struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
+	int ret;
 
 	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
 	trans->tx_buf = mspi->local_buf;
 	trans->rx_buf = mspi->local_buf;
-	fsl_espi_do_trans(m, trans);
+	ret = fsl_espi_do_trans(m, trans);
 
-	if (!trans->status) {
+	if (!ret) {
 		/* If there is at least one RX byte then copy it to rx_buff */
 		if (trans->len > tx_only)
 			memcpy(rx_buff, trans->rx_buf + tx_only,
 			       trans->len - tx_only);
 		trans->actual_length += trans->len;
 	}
+
+	return ret;
 }
 
 static int fsl_espi_do_one_msg(struct spi_master *master,
@@ -358,6 +363,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
+	int ret;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
@@ -368,15 +374,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 
 	espi_trans.len = xfer_len;
 	espi_trans.actual_length = 0;
-	espi_trans.status = 0;
 
 	if (!rx_buf)
-		fsl_espi_cmd_trans(m, &espi_trans, NULL);
+		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
 	else
-		fsl_espi_rw_trans(m, &espi_trans, rx_buf);
+		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
 	m->actual_length = espi_trans.actual_length;
-	m->status = espi_trans.status;
+	m->status = ret;
 	spi_finalize_current_message(master);
 	return 0;
 }
-- 
2.9.2


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[PATCH v2 07/18] spi: fsl-espi: fix status handling in fsl_espi_do_one_msg

[Heiner Kallweit]

If an error occurred during message handling return this error instead
of always returning 0 and align the code with the generic
implementation in spi_transfer_one_message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 5f01b65..6b60f7b 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -381,9 +381,12 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
 	m->actual_length = espi_trans.actual_length;
-	m->status = ret;
+	if (m->status == -EINPROGRESS)
+		m->status = ret;
+
 	spi_finalize_current_message(master);
-	return 0;
+
+	return ret;
 }
 
 static int fsl_espi_setup(struct spi_device *spi)
-- 
2.9.2


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[PATCH v2 08/18] spi: fsl-espi: remove element actual_length from struct fsl_espi_trans

[Heiner Kallweit]

If an error occurs during processing the message, then we don't have
to populate the actual_length element of struct message.
So we can get rid of element actual_length in struct
fsl_espi_transfer.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 6b60f7b..726d5fd 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -41,7 +41,6 @@ struct fsl_espi_transfer {
 	const void *tx_buf;
 	void *rx_buf;
 	unsigned len;
-	unsigned actual_length;
 };
 
 /* eSPI Controller mode register definitions */
@@ -327,8 +326,6 @@ static int fsl_espi_cmd_trans(struct spi_message *m,
 	espi_trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, espi_trans);
 
-	espi_trans->actual_length = espi_trans->len;
-
 	return ret;
 }
 
@@ -350,7 +347,6 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 		if (trans->len > tx_only)
 			memcpy(rx_buff, trans->rx_buf + tx_only,
 			       trans->len - tx_only);
-		trans->actual_length += trans->len;
 	}
 
 	return ret;
@@ -373,14 +369,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	}
 
 	espi_trans.len = xfer_len;
-	espi_trans.actual_length = 0;
 
 	if (!rx_buf)
 		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
 	else
 		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
-	m->actual_length = espi_trans.actual_length;
+	m->actual_length = ret ? 0 : espi_trans.len;
+
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
 
-- 
2.9.2


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[PATCH v2 09/18] spi: fsl-espi: eliminate struct fsl_espi_transfer

[Heiner Kallweit]

The remaining elements of struct fsl_espi_transfer are part of struct
spi_transfer anyway. So we can get rid of struct fsl_espi_transfer
and use a struct spi_transfer only.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 56 +++++++++++++++++-----------------------------
 1 file changed, 20 insertions(+), 36 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 726d5fd..8554f18 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -37,12 +37,6 @@ struct fsl_espi_reg {
 	__be32 csmode[4];	/* 0x020 - 0x02c eSPI cs mode register */
 };
 
-struct fsl_espi_transfer {
-	const void *tx_buf;
-	void *rx_buf;
-	unsigned len;
-};
-
 /* eSPI Controller mode register definitions */
 #define SPMODE_ENABLE		(1 << 31)
 #define SPMODE_LOOP		(1 << 30)
@@ -267,17 +261,13 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count;
 }
 
-static int fsl_espi_do_trans(struct spi_message *m,
-			     struct fsl_espi_transfer *tr)
+static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
-	struct fsl_espi_transfer *espi_trans = tr;
-	struct spi_transfer *t, *first, trans;
+	struct spi_transfer *t, *first;
 	int ret = 0;
 
-	memset(&trans, 0, sizeof(trans));
-
 	first = list_first_entry(&m->transfers, struct spi_transfer,
 			transfer_list);
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -288,25 +278,21 @@ static int fsl_espi_do_trans(struct spi_message *m,
 			return -EINVAL;
 		}
 
-		trans.speed_hz = t->speed_hz;
-		trans.bits_per_word = t->bits_per_word;
-		trans.delay_usecs = max(first->delay_usecs, t->delay_usecs);
+		trans->speed_hz = t->speed_hz;
+		trans->bits_per_word = t->bits_per_word;
+		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
 	}
 
-	trans.len = espi_trans->len;
-	trans.tx_buf = espi_trans->tx_buf;
-	trans.rx_buf = espi_trans->rx_buf;
-
-	fsl_espi_setup_transfer(spi, &trans);
+	fsl_espi_setup_transfer(spi, trans);
 
-	if (trans.len)
-		ret = fsl_espi_bufs(spi, &trans);
+	if (trans->len)
+		ret = fsl_espi_bufs(spi, trans);
 
 	if (ret)
 		ret = -EMSGSIZE;
 
-	if (trans.delay_usecs)
-		udelay(trans.delay_usecs);
+	if (trans->delay_usecs)
+		udelay(trans->delay_usecs);
 
 	fsl_espi_setup_transfer(spi, NULL);
 
@@ -314,23 +300,22 @@ static int fsl_espi_do_trans(struct spi_message *m,
 }
 
 static int fsl_espi_cmd_trans(struct spi_message *m,
-			      struct fsl_espi_transfer *trans, u8 *rx_buff)
+			      struct spi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct fsl_espi_transfer *espi_trans = trans;
 	int ret;
 
 	fsl_espi_copy_to_buf(m, mspi);
 
-	espi_trans->tx_buf = mspi->local_buf;
-	espi_trans->rx_buf = mspi->local_buf;
-	ret = fsl_espi_do_trans(m, espi_trans);
+	trans->tx_buf = mspi->local_buf;
+	trans->rx_buf = mspi->local_buf;
+	ret = fsl_espi_do_trans(m, trans);
 
 	return ret;
 }
 
 static int fsl_espi_rw_trans(struct spi_message *m,
-			     struct fsl_espi_transfer *trans, u8 *rx_buff)
+			     struct spi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
@@ -355,10 +340,9 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
-	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
-	struct fsl_espi_transfer espi_trans;
+	struct spi_transfer *t, trans = {};
 	int ret;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -368,14 +352,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			xfer_len += t->len;
 	}
 
-	espi_trans.len = xfer_len;
+	trans.len = xfer_len;
 
 	if (!rx_buf)
-		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
+		ret = fsl_espi_cmd_trans(m, &trans, NULL);
 	else
-		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
+		ret = fsl_espi_rw_trans(m, &trans, rx_buf);
 
-	m->actual_length = ret ? 0 : espi_trans.len;
+	m->actual_length = ret ? 0 : trans.len;
 
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
-- 
2.9.2


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[PATCH v2 10/18] spi: fsl-espi: merge fsl_espi_cmd_trans and fsl_espi_rw_trans

[Heiner Kallweit]

fsl_espi_cmd_trans and fsl_espi_rw_trans share most of the code so
we can merge them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 33 ++++++---------------------------
 1 file changed, 6 insertions(+), 27 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8554f18..f8a6dd1 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -299,23 +299,8 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	return ret;
 }
 
-static int fsl_espi_cmd_trans(struct spi_message *m,
-			      struct spi_transfer *trans, u8 *rx_buff)
-{
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	int ret;
-
-	fsl_espi_copy_to_buf(m, mspi);
-
-	trans->tx_buf = mspi->local_buf;
-	trans->rx_buf = mspi->local_buf;
-	ret = fsl_espi_do_trans(m, trans);
-
-	return ret;
-}
-
-static int fsl_espi_rw_trans(struct spi_message *m,
-			     struct spi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
+			  u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
@@ -327,12 +312,9 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 	trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, trans);
 
-	if (!ret) {
-		/* If there is at least one RX byte then copy it to rx_buff */
-		if (trans->len > tx_only)
-			memcpy(rx_buff, trans->rx_buf + tx_only,
-			       trans->len - tx_only);
-	}
+	/* If there is at least one RX byte then copy it to rx_buff */
+	if (!ret && rx_buff && trans->len > tx_only)
+		memcpy(rx_buff, trans->rx_buf + tx_only, trans->len - tx_only);
 
 	return ret;
 }
@@ -354,10 +336,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 
 	trans.len = xfer_len;
 
-	if (!rx_buf)
-		ret = fsl_espi_cmd_trans(m, &trans, NULL);
-	else
-		ret = fsl_espi_rw_trans(m, &trans, rx_buf);
+	ret = fsl_espi_trans(m, &trans, rx_buf);
 
 	m->actual_length = ret ? 0 : trans.len;
 
-- 
2.9.2


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[PATCH v2 11/18] spi: fsl-espi: improve return value handling in fsl_espi_bufs

[Heiner Kallweit]

Return a proper status code from fsl_espi_bufs instead of returning
the number of remaining words and let the caller evaluate it.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index f8a6dd1..8d6a570 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -258,7 +258,7 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	/* disable rx ints */
 	mpc8xxx_spi_write_reg(&reg_base->mask, 0);
 
-	return mpc8xxx_spi->count;
+	return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0;
 }
 
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
@@ -288,9 +288,6 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	if (trans->len)
 		ret = fsl_espi_bufs(spi, trans);
 
-	if (ret)
-		ret = -EMSGSIZE;
-
 	if (trans->delay_usecs)
 		udelay(trans->delay_usecs);
 
-- 
2.9.2


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[PATCH v2 12/18] spi: fsl-espi: merge fsl_espi_bufs and fsl_espi_cpu_bufs

[Heiner Kallweit]

fsl_espi_bufs and fsl_espi_cpu_bufs are very small that we can merge them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 27 ++++++++-------------------
 1 file changed, 8 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8d6a570..190ca5c 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -206,31 +206,15 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
 	fsl_espi_change_mode(spi);
 }
 
-static void fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
-		unsigned int len)
-{
-	u32 word;
-	struct fsl_espi_reg *reg_base = mspi->reg_base;
-
-	mspi->count = len;
-
-	/* enable rx ints */
-	mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
-
-	/* transmit word */
-	word = mspi->get_tx(mspi);
-	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
-}
-
 static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 {
 	struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
 	struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
-	unsigned int len = t->len;
+	u32 word;
 	int ret;
 
 	mpc8xxx_spi->len = t->len;
-	len = roundup(len, 4) / 4;
+	mpc8xxx_spi->count = roundup(t->len, 4) / 4;
 
 	mpc8xxx_spi->tx = t->tx_buf;
 	mpc8xxx_spi->rx = t->rx_buf;
@@ -246,7 +230,12 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
-	fsl_espi_cpu_bufs(mpc8xxx_spi, t, len);
+	/* enable rx ints */
+	mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
+
+	/* transmit word */
+	word = mpc8xxx_spi->get_tx(mpc8xxx_spi);
+	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
 
 	/* Won't hang up forever, SPI bus sometimes got lost interrupts... */
 	ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ);
-- 
2.9.2


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[PATCH v2 13/18] spi: fsl-espi: improve the ISR frame

[Heiner Kallweit]

Improve the ISR frame:
- move resetting the event bits to the ISR frame
- change type of parameter irq to int
- make sure that the event bits match at least one bit in the
  interrupt mask register

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 190ca5c..534dc14 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -451,17 +451,11 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 				&reg_base->event)) & SPIE_NF), 1000, 0);
 		if (!ret) {
 			dev_err(mspi->dev, "tired waiting for SPIE_NF\n");
-
-			/* Clear the SPIE bits */
-			mpc8xxx_spi_write_reg(&reg_base->event, events);
 			complete(&mspi->done);
 			return;
 		}
 	}
 
-	/* Clear the events */
-	mpc8xxx_spi_write_reg(&reg_base->event, events);
-
 	mspi->count -= 1;
 	if (mspi->count) {
 		u32 word = mspi->get_tx(mspi);
@@ -472,23 +466,26 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 	}
 }
 
-static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
+static irqreturn_t fsl_espi_irq(int irq, void *context_data)
 {
 	struct mpc8xxx_spi *mspi = context_data;
 	struct fsl_espi_reg *reg_base = mspi->reg_base;
-	irqreturn_t ret = IRQ_NONE;
-	u32 events;
+	u32 mask, events;
 
-	/* Get interrupt events(tx/rx) */
+	/* Get interrupt mask and events and check that irq belongs to us */
+	mask = mpc8xxx_spi_read_reg(&reg_base->mask);
 	events = mpc8xxx_spi_read_reg(&reg_base->event);
-	if (events)
-		ret = IRQ_HANDLED;
+	if (!(mask & events))
+		return IRQ_NONE;
 
 	dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events);
 
 	fsl_espi_cpu_irq(mspi, events);
 
-	return ret;
+	/* Clear the events */
+	mpc8xxx_spi_write_reg(&reg_base->event, events);
+
+	return IRQ_HANDLED;
 }
 
 #ifdef CONFIG_PM
-- 
2.9.2


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[PATCH v2 14/18] spi: fsl-espi: factor out initial message checking

[Heiner Kallweit]

Checking the message is currently done at diffrent places in the
driver. Factor it out to fsl_espi_check_message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 43 +++++++++++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 534dc14..a32bc3a 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -98,6 +98,30 @@ static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
 	return tx_only;
 }
 
+static int fsl_espi_check_message(struct spi_message *m)
+{
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
+	struct spi_transfer *t, *first;
+
+	if (m->frame_length > SPCOM_TRANLEN_MAX) {
+		dev_err(mspi->dev, "message too long, size is %u bytes\n",
+			m->frame_length);
+		return -EMSGSIZE;
+	}
+
+	first = list_first_entry(&m->transfers, struct spi_transfer,
+				 transfer_list);
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (first->bits_per_word != t->bits_per_word ||
+		    first->speed_hz != t->speed_hz) {
+			dev_err(mspi->dev, "bits_per_word/speed_hz should be the same for all transfers\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
 static void fsl_espi_change_mode(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@@ -222,11 +246,6 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	reinit_completion(&mpc8xxx_spi->done);
 
 	/* Set SPCOM[CS] and SPCOM[TRANLEN] field */
-	if (t->len > SPCOM_TRANLEN_MAX) {
-		dev_err(mpc8xxx_spi->dev, "Transaction length (%d)"
-				" beyond the SPCOM[TRANLEN] field\n", t->len);
-		return -EINVAL;
-	}
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
@@ -253,20 +272,12 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct spi_transfer *t, *first;
 	int ret = 0;
 
 	first = list_first_entry(&m->transfers, struct spi_transfer,
 			transfer_list);
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if ((first->bits_per_word != t->bits_per_word) ||
-			(first->speed_hz != t->speed_hz)) {
-			dev_err(mspi->dev,
-				"bits_per_word/speed_hz should be same for the same SPI transfer\n");
-			return -EINVAL;
-		}
-
 		trans->speed_hz = t->speed_hz;
 		trans->bits_per_word = t->bits_per_word;
 		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
@@ -313,6 +324,10 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	struct spi_transfer *t, trans = {};
 	int ret;
 
+	ret = fsl_espi_check_message(m);
+	if (ret)
+		goto out;
+
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
@@ -325,7 +340,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	ret = fsl_espi_trans(m, &trans, rx_buf);
 
 	m->actual_length = ret ? 0 : trans.len;
-
+out:
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
 
-- 
2.9.2


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[PATCH v2 15/18] spi: fsl-espi: centralize populating struct spi_transfer

[Heiner Kallweit]

Better structure the code by population all elements of struct
spi_transfer in one place.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index a32bc3a..79c89bf 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -272,17 +272,8 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
-	struct spi_transfer *t, *first;
 	int ret = 0;
 
-	first = list_first_entry(&m->transfers, struct spi_transfer,
-			transfer_list);
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		trans->speed_hz = t->speed_hz;
-		trans->bits_per_word = t->bits_per_word;
-		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
-	}
-
 	fsl_espi_setup_transfer(spi, trans);
 
 	if (trans->len)
@@ -305,8 +296,6 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
 
 	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
-	trans->tx_buf = mspi->local_buf;
-	trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, trans);
 
 	/* If there is at least one RX byte then copy it to rx_buff */
@@ -319,8 +308,9 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	u8 *rx_buf = NULL;
-	unsigned int xfer_len = 0;
+	unsigned int delay_usecs = 0, xfer_len = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
 
@@ -333,9 +323,19 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			rx_buf = t->rx_buf;
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
+		if (t->delay_usecs > delay_usecs)
+			delay_usecs = t->delay_usecs;
 	}
 
+	t = list_first_entry(&m->transfers, struct spi_transfer,
+			     transfer_list);
+
 	trans.len = xfer_len;
+	trans.speed_hz = t->speed_hz;
+	trans.bits_per_word = t->bits_per_word;
+	trans.delay_usecs = delay_usecs;
+	trans.tx_buf = mspi->local_buf;
+	trans.rx_buf = mspi->local_buf;
 
 	ret = fsl_espi_trans(m, &trans, rx_buf);
 
-- 
2.9.2


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[PATCH v2 16/18] spi: fsl-espi: factor out handling of read data

[Heiner Kallweit]

Factor out copying read data to the read buffers in the original
message to a new function fsl_espi_copy_from_buf.
This also allows to simplify fsl_espi_copy_to_buf.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 41 +++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 20 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 79c89bf..88935a3 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -77,25 +77,32 @@ struct fsl_espi_reg {
 
 #define AUTOSUSPEND_TIMEOUT 2000
 
-static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
-					 struct mpc8xxx_spi *mspi)
+static void fsl_espi_copy_to_buf(struct spi_message *m,
+				 struct mpc8xxx_spi *mspi)
 {
-	unsigned int tx_only = 0;
 	struct spi_transfer *t;
 	u8 *buf = mspi->local_buf;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
+		if (t->tx_buf)
 			memcpy(buf, t->tx_buf, t->len);
-			if (!t->rx_buf)
-				tx_only += t->len;
-		} else {
+		else
 			memset(buf, 0, t->len);
-		}
 		buf += t->len;
 	}
+}
+
+static void fsl_espi_copy_from_buf(struct spi_message *m,
+				   struct mpc8xxx_spi *mspi)
+{
+	struct spi_transfer *t;
+	u8 *buf = mspi->local_buf;
 
-	return tx_only;
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (t->rx_buf)
+			memcpy(t->rx_buf, buf, t->len);
+		buf += t->len;
+	}
 }
 
 static int fsl_espi_check_message(struct spi_message *m)
@@ -287,20 +294,17 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	return ret;
 }
 
-static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
-			  u8 *rx_buff)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	unsigned int tx_only;
 	int ret;
 
-	tx_only = fsl_espi_copy_to_buf(m, mspi);
+	fsl_espi_copy_to_buf(m, mspi);
 
 	ret = fsl_espi_do_trans(m, trans);
 
-	/* If there is at least one RX byte then copy it to rx_buff */
-	if (!ret && rx_buff && trans->len > tx_only)
-		memcpy(rx_buff, trans->rx_buf + tx_only, trans->len - tx_only);
+	if (!ret)
+		fsl_espi_copy_from_buf(m, mspi);
 
 	return ret;
 }
@@ -309,7 +313,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	u8 *rx_buf = NULL;
 	unsigned int delay_usecs = 0, xfer_len = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
@@ -319,8 +322,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		goto out;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->rx_buf)
-			rx_buf = t->rx_buf;
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
 		if (t->delay_usecs > delay_usecs)
@@ -337,7 +338,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	trans.tx_buf = mspi->local_buf;
 	trans.rx_buf = mspi->local_buf;
 
-	ret = fsl_espi_trans(m, &trans, rx_buf);
+	ret = fsl_espi_trans(m, &trans);
 
 	m->actual_length = ret ? 0 : trans.len;
 out:
-- 
2.9.2


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[PATCH v2 17/18] spi: fsl-espi: improve message length handling

[Heiner Kallweit]

Move checking for a zero-length message up in the call chain and
use m->frame_length instead of re-calculating the overall length
of all transfers in the message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 88935a3..84355bb 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -283,8 +283,7 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 
 	fsl_espi_setup_transfer(spi, trans);
 
-	if (trans->len)
-		ret = fsl_espi_bufs(spi, trans);
+	ret = fsl_espi_bufs(spi, trans);
 
 	if (trans->delay_usecs)
 		udelay(trans->delay_usecs);
@@ -313,7 +312,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	unsigned int delay_usecs = 0, xfer_len = 0;
+	unsigned int delay_usecs = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
 
@@ -322,8 +321,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		goto out;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if ((t->tx_buf) || (t->rx_buf))
-			xfer_len += t->len;
 		if (t->delay_usecs > delay_usecs)
 			delay_usecs = t->delay_usecs;
 	}
@@ -331,14 +328,15 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	t = list_first_entry(&m->transfers, struct spi_transfer,
 			     transfer_list);
 
-	trans.len = xfer_len;
+	trans.len = m->frame_length;
 	trans.speed_hz = t->speed_hz;
 	trans.bits_per_word = t->bits_per_word;
 	trans.delay_usecs = delay_usecs;
 	trans.tx_buf = mspi->local_buf;
 	trans.rx_buf = mspi->local_buf;
 
-	ret = fsl_espi_trans(m, &trans);
+	if (trans.len)
+		ret = fsl_espi_trans(m, &trans);
 
 	m->actual_length = ret ? 0 : trans.len;
 out:
-- 
2.9.2


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[PATCH v2 18/18] spi: fsl-espi: merge fsl_espi_trans and fsl_espi_do_trans

[Heiner Kallweit]

Merge both functions to reduce source code size and improve
readability.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
---
 drivers/spi/spi-fsl-espi.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 84355bb..f7d682f 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -276,11 +276,13 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0;
 }
 
-static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_device *spi = m->spi;
-	int ret = 0;
+	int ret;
 
+	fsl_espi_copy_to_buf(m, mspi);
 	fsl_espi_setup_transfer(spi, trans);
 
 	ret = fsl_espi_bufs(spi, trans);
@@ -290,18 +292,6 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 
 	fsl_espi_setup_transfer(spi, NULL);
 
-	return ret;
-}
-
-static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
-{
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	int ret;
-
-	fsl_espi_copy_to_buf(m, mspi);
-
-	ret = fsl_espi_do_trans(m, trans);
-
 	if (!ret)
 		fsl_espi_copy_from_buf(m, mspi);
 
-- 
2.9.2


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Re: [PATCH v2 04/18] spi: fsl-espi: pre-allocate message buffer

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 1034 bytes --]

On Sun, Sep 04, 2016 at 09:58:02AM +0200, Heiner Kallweit wrote:
> Currently the driver allocates a 64kb buffer with each single message.
> On systems with little and fragmented memory this can result in
> memory allocation errors. Solve this by pre-allocating a buffer.
> 
> This patch was developed in OpenWRT long ago, however it never
> made it upstream. Author: Gabor Juhos <juhosg-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>
> 
> I slightly modified the original patch to re-initialize the buffer
> at the beginning of each transfer.
> 
> Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

When you sent this previously I asked what happened with the signoff
from Gabor.  A little Google tells me that he did in fact sign off the
copy that's in OpenWRT.  Please don't drop signoffs, they're important
for tracking licensing - see SubmittingPatches for details.  If the
modifications you made really are slight as you say then I'd also expect
Gabor's authorship to be preserved.

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 455 bytes --]

Applied "spi: fsl-espi: remove unneeded check in fsl_espi_do_trans" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: remove unneeded check in fsl_espi_do_trans

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 71581a1507e642bbc6f698a3f43355552ee8056f Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Sun, 4 Sep 2016 09:57:18 +0200
Subject: [PATCH] spi: fsl-espi: remove unneeded check in fsl_espi_do_trans

SPI core takes care that both values are always populated.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index b00313bed7e9..16fff7237ab2 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -279,8 +279,7 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	trans.tx_buf = espi_trans->tx_buf;
 	trans.rx_buf = espi_trans->rx_buf;
 
-	if (trans.bits_per_word || trans.speed_hz)
-		fsl_espi_setup_transfer(spi, &trans);
+	fsl_espi_setup_transfer(spi, &trans);
 
 	if (trans.len)
 		status = fsl_espi_bufs(spi, &trans);
-- 
2.9.3

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Applied "spi: fsl-espi: simplify fsl_espi_setup_transfer" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: simplify fsl_espi_setup_transfer

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From a755af52f8ef278985d1475070c0647f2e6e47a7 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Sun, 4 Sep 2016 09:56:57 +0200
Subject: [PATCH] spi: fsl-espi: simplify fsl_espi_setup_transfer

Simplify fsl_espi_setup_transfer a little.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index a9004fe5a5ed..b00313bed7e9 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -166,12 +166,10 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
 	mpc8xxx_spi->get_rx = cs->get_rx;
 	mpc8xxx_spi->get_tx = cs->get_tx;
 
-	bits_per_word = bits_per_word - 1;
-
 	/* mask out bits we are going to set */
 	cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF));
 
-	cs->hw_mode |= CSMODE_LEN(bits_per_word);
+	cs->hw_mode |= CSMODE_LEN(bits_per_word - 1);
 
 	if ((mpc8xxx_spi->spibrg / hz) > 64) {
 		cs->hw_mode |= CSMODE_DIV16;
-- 
2.9.3

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Applied "spi: fsl-espi: remove unused elements n_rx and n_tx in struct fsl_espi_transfer" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: remove unused elements n_rx and n_tx in struct fsl_espi_transfer

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From daae020ce9fe4324322c6ed18a840234a05d76b3 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Sun, 4 Sep 2016 09:53:01 +0200
Subject: [PATCH] spi: fsl-espi: remove unused elements n_rx and n_tx in struct
 fsl_espi_transfer

Both elements are not used, so remove them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index f9ef50444447..a9004fe5a5ed 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -41,8 +41,6 @@ struct fsl_espi_transfer {
 	const void *tx_buf;
 	void *rx_buf;
 	unsigned len;
-	unsigned n_tx;
-	unsigned n_rx;
 	unsigned actual_length;
 	int status;
 };
@@ -371,24 +369,16 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 {
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
-	unsigned int n_tx = 0;
-	unsigned int n_rx = 0;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf)
-			n_tx += t->len;
-		if (t->rx_buf) {
-			n_rx += t->len;
+		if (t->rx_buf)
 			rx_buf = t->rx_buf;
-		}
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
 	}
 
-	espi_trans.n_tx = n_tx;
-	espi_trans.n_rx = n_rx;
 	espi_trans.len = xfer_len;
 	espi_trans.actual_length = 0;
 	espi_trans.status = 0;
-- 
2.9.3

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Re: [PATCH v2 04/18] spi: fsl-espi: pre-allocate message buffer

[Heiner Kallweit]

Am 06.09.2016 um 12:58 schrieb Mark Brown:
> On Sun, Sep 04, 2016 at 09:58:02AM +0200, Heiner Kallweit wrote:
>> Currently the driver allocates a 64kb buffer with each single message.
>> On systems with little and fragmented memory this can result in
>> memory allocation errors. Solve this by pre-allocating a buffer.
>>
>> This patch was developed in OpenWRT long ago, however it never
>> made it upstream. Author: Gabor Juhos <juhosg-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>
>>
>> I slightly modified the original patch to re-initialize the buffer
>> at the beginning of each transfer.
>>
>> Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> 
> When you sent this previously I asked what happened with the signoff
> from Gabor.  A little Google tells me that he did in fact sign off the
> copy that's in OpenWRT.  Please don't drop signoffs, they're important
> for tracking licensing - see SubmittingPatches for details.  If the
> modifications you made really are slight as you say then I'd also expect
> Gabor's authorship to be preserved.
> 
Sorry, then I misunderstood your comment.
I'll resend the patch with Gabor's Signed-off-by. Do you want my
Signed-off-by in addition?
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Re: [PATCH v2 04/18] spi: fsl-espi: pre-allocate message buffer

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 324 bytes --]

On Tue, Sep 06, 2016 at 10:57:49PM +0200, Heiner Kallweit wrote:

> Sorry, then I misunderstood your comment.
> I'll resend the patch with Gabor's Signed-off-by. Do you want my
> Signed-off-by in addition?

You need your signoff on anything you send including this - like I say
see SubmittingPatches for what this is doing.

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[PATCH v3 04/18] spi: fsl-espi: pre-allocate message buffer

[Heiner Kallweit]

Currently the driver allocates a 64kb buffer for each single message.
On systems with little and fragmented memory this can result in
memory allocation errors. Solve this by pre-allocating a buffer.

This patch was developed in OpenWRT long ago, however it never
made it upstream.

I slightly modified the original patch to re-initialize the buffer
at the beginning of each transfer.

Signed-off-by: Gabor Juhos <juhosg-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>
Signed-off-by: Felix Fietkau <nbd-Vt+b4OUoWG0@public.gmane.org>
Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- fixed coding style issue
- fixed commit message
v3:
- changed Signed-off-by to include original author
---
 drivers/spi/spi-fsl-espi.c | 41 ++++++++++++++++++-----------------------
 drivers/spi/spi-fsl-lib.h  |  1 +
 2 files changed, 19 insertions(+), 23 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index a9004fe..a3a75ae 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -300,57 +300,44 @@ static void fsl_espi_do_trans(struct spi_message *m,
 static void fsl_espi_cmd_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_transfer *t;
-	u8 *local_buf;
 	int i = 0;
 	struct fsl_espi_transfer *espi_trans = trans;
 
-	local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!local_buf) {
-		espi_trans->status = -ENOMEM;
-		return;
-	}
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf) {
-			memcpy(local_buf + i, t->tx_buf, t->len);
+			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
 			i += t->len;
 		}
 	}
 
-	espi_trans->tx_buf = local_buf;
-	espi_trans->rx_buf = local_buf;
+	espi_trans->tx_buf = mspi->local_buf;
+	espi_trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, espi_trans);
 
 	espi_trans->actual_length = espi_trans->len;
-	kfree(local_buf);
 }
 
 static void fsl_espi_rw_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_transfer *t;
-	u8 *local_buf;
 	unsigned int tx_only = 0;
 	int i = 0;
 
-	local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!local_buf) {
-		trans->status = -ENOMEM;
-		return;
-	}
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf) {
-			memcpy(local_buf + i, t->tx_buf, t->len);
+			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
 			i += t->len;
 			if (!t->rx_buf)
 				tx_only += t->len;
 		}
 	}
 
-	trans->tx_buf = local_buf;
-	trans->rx_buf = local_buf;
+	trans->tx_buf = mspi->local_buf;
+	trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, trans);
 
 	if (!trans->status) {
@@ -360,18 +347,19 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 			       trans->len - tx_only);
 		trans->actual_length += trans->len;
 	}
-
-	kfree(local_buf);
 }
 
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
+	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
+
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
@@ -617,6 +605,13 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
 
 	mpc8xxx_spi = spi_master_get_devdata(master);
 
+	mpc8xxx_spi->local_buf =
+		devm_kmalloc(dev, SPCOM_TRANLEN_MAX, GFP_KERNEL);
+	if (!mpc8xxx_spi->local_buf) {
+		ret = -ENOMEM;
+		goto err_probe;
+	}
+
 	mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
 	if (IS_ERR(mpc8xxx_spi->reg_base)) {
 		ret = PTR_ERR(mpc8xxx_spi->reg_base);
diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h
index 84f5dcb..065b9db 100644
--- a/drivers/spi/spi-fsl-lib.h
+++ b/drivers/spi/spi-fsl-lib.h
@@ -30,6 +30,7 @@ struct mpc8xxx_spi {
 	void *rx;
 #if IS_ENABLED(CONFIG_SPI_FSL_ESPI)
 	int len;
+	u8 *local_buf;
 #endif
 
 	int subblock;
-- 
2.9.2


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Re: [PATCH v3 04/18] spi: fsl-espi: pre-allocate message buffer

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 636 bytes --]

On Wed, Sep 07, 2016 at 07:46:33AM +0200, Heiner Kallweit wrote:
> Currently the driver allocates a 64kb buffer for each single message.
> On systems with little and fragmented memory this can result in
> memory allocation errors. Solve this by pre-allocating a buffer.

This is flagged as patch 4/18 but I only have this as a single patch.
As previously discussed the purpose of the numbering in a patch series
is to order things, if you're just sending a single patch it doesn't
need numbering and if you're sending a series you need to send either
the whole thing or at least a cover letter to everyone so they know
what's going on.

[-- Attachment #2: signature.asc --]
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Re: [PATCH v3 04/18] spi: fsl-espi: pre-allocate message buffer

[Heiner Kallweit]

Am 07.09.2016 um 20:56 schrieb Mark Brown:
> On Wed, Sep 07, 2016 at 07:46:33AM +0200, Heiner Kallweit wrote:
>> Currently the driver allocates a 64kb buffer for each single message.
>> On systems with little and fragmented memory this can result in
>> memory allocation errors. Solve this by pre-allocating a buffer.
> 
> This is flagged as patch 4/18 but I only have this as a single patch.
> As previously discussed the purpose of the numbering in a patch series
> is to order things, if you're just sending a single patch it doesn't
> need numbering and if you're sending a series you need to send either
> the whole thing or at least a cover letter to everyone so they know
> what's going on.
> 
OK, as you applied three further patches from the series already, I'll
resend the remaining 15 with new numbering.


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[PATCH v3 01/15] spi: fsl-espi: pre-allocate message buffer

[Heiner Kallweit]

Currently the driver allocates a 64kb buffer for each single message.
On systems with little and fragmented memory this can result in
memory allocation errors. Solve this by pre-allocating a buffer.

This patch was developed in OpenWRT long ago, however it never
made it upstream.

I slightly modified the original patch to re-initialize the buffer
at the beginning of each transfer.

Signed-off-by: Gabor Juhos <juhosg-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>
Signed-off-by: Felix Fietkau <nbd-Vt+b4OUoWG0@public.gmane.org>
Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- fixed coding style issue
- fixed commit message
v3:
- changed Signed-off-by to include original author
---
 drivers/spi/spi-fsl-espi.c | 41 ++++++++++++++++++-----------------------
 drivers/spi/spi-fsl-lib.h  |  1 +
 2 files changed, 19 insertions(+), 23 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index a9004fe..a3a75ae 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -300,57 +300,44 @@ static void fsl_espi_do_trans(struct spi_message *m,
 static void fsl_espi_cmd_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_transfer *t;
-	u8 *local_buf;
 	int i = 0;
 	struct fsl_espi_transfer *espi_trans = trans;
 
-	local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!local_buf) {
-		espi_trans->status = -ENOMEM;
-		return;
-	}
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf) {
-			memcpy(local_buf + i, t->tx_buf, t->len);
+			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
 			i += t->len;
 		}
 	}
 
-	espi_trans->tx_buf = local_buf;
-	espi_trans->rx_buf = local_buf;
+	espi_trans->tx_buf = mspi->local_buf;
+	espi_trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, espi_trans);
 
 	espi_trans->actual_length = espi_trans->len;
-	kfree(local_buf);
 }
 
 static void fsl_espi_rw_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_transfer *t;
-	u8 *local_buf;
 	unsigned int tx_only = 0;
 	int i = 0;
 
-	local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!local_buf) {
-		trans->status = -ENOMEM;
-		return;
-	}
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf) {
-			memcpy(local_buf + i, t->tx_buf, t->len);
+			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
 			i += t->len;
 			if (!t->rx_buf)
 				tx_only += t->len;
 		}
 	}
 
-	trans->tx_buf = local_buf;
-	trans->rx_buf = local_buf;
+	trans->tx_buf = mspi->local_buf;
+	trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, trans);
 
 	if (!trans->status) {
@@ -360,18 +347,19 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 			       trans->len - tx_only);
 		trans->actual_length += trans->len;
 	}
-
-	kfree(local_buf);
 }
 
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
+	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
+
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
@@ -617,6 +605,13 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
 
 	mpc8xxx_spi = spi_master_get_devdata(master);
 
+	mpc8xxx_spi->local_buf =
+		devm_kmalloc(dev, SPCOM_TRANLEN_MAX, GFP_KERNEL);
+	if (!mpc8xxx_spi->local_buf) {
+		ret = -ENOMEM;
+		goto err_probe;
+	}
+
 	mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
 	if (IS_ERR(mpc8xxx_spi->reg_base)) {
 		ret = PTR_ERR(mpc8xxx_spi->reg_base);
diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h
index 84f5dcb..065b9db 100644
--- a/drivers/spi/spi-fsl-lib.h
+++ b/drivers/spi/spi-fsl-lib.h
@@ -30,6 +30,7 @@ struct mpc8xxx_spi {
 	void *rx;
 #if IS_ENABLED(CONFIG_SPI_FSL_ESPI)
 	int len;
+	u8 *local_buf;
 #endif
 
 	int subblock;
-- 
2.9.2


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[PATCH v3 02/15] spi: fsl-espi: factor out filling the local buffer

[Heiner Kallweit]

Better structure the code by factoring out filling the local buffer.

In addition don't initialize the complete local buffer at the
beginning of fsl_espi_do_one_msg. Instead move initialization of
those parts of the local buffer to be used for transfers w/o tx_buf
to fsl_espi_copy_to_buf.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- fixed coding style issue
- improved commit message
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 46 ++++++++++++++++++++++++----------------------
 1 file changed, 24 insertions(+), 22 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index a3a75ae..c0023c0 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -85,6 +85,27 @@ struct fsl_espi_transfer {
 
 #define AUTOSUSPEND_TIMEOUT 2000
 
+static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
+					 struct mpc8xxx_spi *mspi)
+{
+	unsigned int tx_only = 0;
+	struct spi_transfer *t;
+	u8 *buf = mspi->local_buf;
+
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (t->tx_buf) {
+			memcpy(buf, t->tx_buf, t->len);
+			if (!t->rx_buf)
+				tx_only += t->len;
+		} else {
+			memset(buf, 0, t->len);
+		}
+		buf += t->len;
+	}
+
+	return tx_only;
+}
+
 static void fsl_espi_change_mode(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@@ -301,16 +322,9 @@ static void fsl_espi_cmd_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct spi_transfer *t;
-	int i = 0;
 	struct fsl_espi_transfer *espi_trans = trans;
 
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
-			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
-			i += t->len;
-		}
-	}
+	fsl_espi_copy_to_buf(m, mspi);
 
 	espi_trans->tx_buf = mspi->local_buf;
 	espi_trans->rx_buf = mspi->local_buf;
@@ -323,18 +337,9 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct spi_transfer *t;
-	unsigned int tx_only = 0;
-	int i = 0;
+	unsigned int tx_only;
 
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
-			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
-			i += t->len;
-			if (!t->rx_buf)
-				tx_only += t->len;
-		}
-	}
+	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
 	trans->tx_buf = mspi->local_buf;
 	trans->rx_buf = mspi->local_buf;
@@ -352,14 +357,11 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
-	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
-- 
2.9.2


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[PATCH v3 03/15] spi: fsl-espi: remove element status from struct fsl_espi_transfer

[Heiner Kallweit]

Use the return values of the functions in the call chain to transport
status information instead of using an element in struct
fsl_espi_transfer for this.

This is more in line with the general approach how to handle status
information and is one step further to eventually get rid of
struct fsl_espi_transfer completely.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 47 +++++++++++++++++++++++++---------------------
 1 file changed, 26 insertions(+), 21 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8e6ef9b..5f01b65 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -42,7 +42,6 @@ struct fsl_espi_transfer {
 	void *rx_buf;
 	unsigned len;
 	unsigned actual_length;
-	int status;
 };
 
 /* eSPI Controller mode register definitions */
@@ -269,14 +268,14 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count;
 }
 
-static void fsl_espi_do_trans(struct spi_message *m,
-				struct fsl_espi_transfer *tr)
+static int fsl_espi_do_trans(struct spi_message *m,
+			     struct fsl_espi_transfer *tr)
 {
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct fsl_espi_transfer *espi_trans = tr;
 	struct spi_transfer *t, *first, trans;
-	int status = 0;
+	int ret = 0;
 
 	memset(&trans, 0, sizeof(trans));
 
@@ -285,10 +284,9 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if ((first->bits_per_word != t->bits_per_word) ||
 			(first->speed_hz != t->speed_hz)) {
-			espi_trans->status = -EINVAL;
 			dev_err(mspi->dev,
 				"bits_per_word/speed_hz should be same for the same SPI transfer\n");
-			return;
+			return -EINVAL;
 		}
 
 		trans.speed_hz = t->speed_hz;
@@ -303,52 +301,59 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	fsl_espi_setup_transfer(spi, &trans);
 
 	if (trans.len)
-		status = fsl_espi_bufs(spi, &trans);
+		ret = fsl_espi_bufs(spi, &trans);
 
-	if (status)
-		status = -EMSGSIZE;
+	if (ret)
+		ret = -EMSGSIZE;
 
 	if (trans.delay_usecs)
 		udelay(trans.delay_usecs);
 
-	espi_trans->status = status;
 	fsl_espi_setup_transfer(spi, NULL);
+
+	return ret;
 }
 
-static void fsl_espi_cmd_trans(struct spi_message *m,
-				struct fsl_espi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_cmd_trans(struct spi_message *m,
+			      struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct fsl_espi_transfer *espi_trans = trans;
+	int ret;
 
 	fsl_espi_copy_to_buf(m, mspi);
 
 	espi_trans->tx_buf = mspi->local_buf;
 	espi_trans->rx_buf = mspi->local_buf;
-	fsl_espi_do_trans(m, espi_trans);
+	ret = fsl_espi_do_trans(m, espi_trans);
 
 	espi_trans->actual_length = espi_trans->len;
+
+	return ret;
 }
 
-static void fsl_espi_rw_trans(struct spi_message *m,
-				struct fsl_espi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_rw_trans(struct spi_message *m,
+			     struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
+	int ret;
 
 	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
 	trans->tx_buf = mspi->local_buf;
 	trans->rx_buf = mspi->local_buf;
-	fsl_espi_do_trans(m, trans);
+	ret = fsl_espi_do_trans(m, trans);
 
-	if (!trans->status) {
+	if (!ret) {
 		/* If there is at least one RX byte then copy it to rx_buff */
 		if (trans->len > tx_only)
 			memcpy(rx_buff, trans->rx_buf + tx_only,
 			       trans->len - tx_only);
 		trans->actual_length += trans->len;
 	}
+
+	return ret;
 }
 
 static int fsl_espi_do_one_msg(struct spi_master *master,
@@ -358,6 +363,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
+	int ret;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
@@ -368,15 +374,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 
 	espi_trans.len = xfer_len;
 	espi_trans.actual_length = 0;
-	espi_trans.status = 0;
 
 	if (!rx_buf)
-		fsl_espi_cmd_trans(m, &espi_trans, NULL);
+		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
 	else
-		fsl_espi_rw_trans(m, &espi_trans, rx_buf);
+		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
 	m->actual_length = espi_trans.actual_length;
-	m->status = espi_trans.status;
+	m->status = ret;
 	spi_finalize_current_message(master);
 	return 0;
 }
-- 
2.9.2


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[PATCH v3 04/15] spi: fsl-espi: fix status handling in fsl_espi_do_one_msg

[Heiner Kallweit]

If an error occurred during message handling return this error instead
of always returning 0 and align the code with the generic
implementation in spi_transfer_one_message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 5f01b65..6b60f7b 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -381,9 +381,12 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
 	m->actual_length = espi_trans.actual_length;
-	m->status = ret;
+	if (m->status == -EINPROGRESS)
+		m->status = ret;
+
 	spi_finalize_current_message(master);
-	return 0;
+
+	return ret;
 }
 
 static int fsl_espi_setup(struct spi_device *spi)
-- 
2.9.2


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[PATCH v3 05/15] spi: fsl-espi: remove element actual_length from struct fsl_espi_trans

[Heiner Kallweit]

If an error occurs during processing the message, then we don't have
to populate the actual_length element of struct message.
So we can get rid of element actual_length in struct
fsl_espi_transfer.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 6b60f7b..726d5fd 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -41,7 +41,6 @@ struct fsl_espi_transfer {
 	const void *tx_buf;
 	void *rx_buf;
 	unsigned len;
-	unsigned actual_length;
 };
 
 /* eSPI Controller mode register definitions */
@@ -327,8 +326,6 @@ static int fsl_espi_cmd_trans(struct spi_message *m,
 	espi_trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, espi_trans);
 
-	espi_trans->actual_length = espi_trans->len;
-
 	return ret;
 }
 
@@ -350,7 +347,6 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 		if (trans->len > tx_only)
 			memcpy(rx_buff, trans->rx_buf + tx_only,
 			       trans->len - tx_only);
-		trans->actual_length += trans->len;
 	}
 
 	return ret;
@@ -373,14 +369,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	}
 
 	espi_trans.len = xfer_len;
-	espi_trans.actual_length = 0;
 
 	if (!rx_buf)
 		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
 	else
 		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
-	m->actual_length = espi_trans.actual_length;
+	m->actual_length = ret ? 0 : espi_trans.len;
+
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
 
-- 
2.9.2


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[PATCH v3 06/15] spi: fsl-espi: eliminate struct fsl_espi_transfer

[Heiner Kallweit]

The remaining elements of struct fsl_espi_transfer are part of struct
spi_transfer anyway. So we can get rid of struct fsl_espi_transfer
and use a struct spi_transfer only.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 56 +++++++++++++++++-----------------------------
 1 file changed, 20 insertions(+), 36 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 726d5fd..8554f18 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -37,12 +37,6 @@ struct fsl_espi_reg {
 	__be32 csmode[4];	/* 0x020 - 0x02c eSPI cs mode register */
 };
 
-struct fsl_espi_transfer {
-	const void *tx_buf;
-	void *rx_buf;
-	unsigned len;
-};
-
 /* eSPI Controller mode register definitions */
 #define SPMODE_ENABLE		(1 << 31)
 #define SPMODE_LOOP		(1 << 30)
@@ -267,17 +261,13 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count;
 }
 
-static int fsl_espi_do_trans(struct spi_message *m,
-			     struct fsl_espi_transfer *tr)
+static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
-	struct fsl_espi_transfer *espi_trans = tr;
-	struct spi_transfer *t, *first, trans;
+	struct spi_transfer *t, *first;
 	int ret = 0;
 
-	memset(&trans, 0, sizeof(trans));
-
 	first = list_first_entry(&m->transfers, struct spi_transfer,
 			transfer_list);
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -288,25 +278,21 @@ static int fsl_espi_do_trans(struct spi_message *m,
 			return -EINVAL;
 		}
 
-		trans.speed_hz = t->speed_hz;
-		trans.bits_per_word = t->bits_per_word;
-		trans.delay_usecs = max(first->delay_usecs, t->delay_usecs);
+		trans->speed_hz = t->speed_hz;
+		trans->bits_per_word = t->bits_per_word;
+		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
 	}
 
-	trans.len = espi_trans->len;
-	trans.tx_buf = espi_trans->tx_buf;
-	trans.rx_buf = espi_trans->rx_buf;
-
-	fsl_espi_setup_transfer(spi, &trans);
+	fsl_espi_setup_transfer(spi, trans);
 
-	if (trans.len)
-		ret = fsl_espi_bufs(spi, &trans);
+	if (trans->len)
+		ret = fsl_espi_bufs(spi, trans);
 
 	if (ret)
 		ret = -EMSGSIZE;
 
-	if (trans.delay_usecs)
-		udelay(trans.delay_usecs);
+	if (trans->delay_usecs)
+		udelay(trans->delay_usecs);
 
 	fsl_espi_setup_transfer(spi, NULL);
 
@@ -314,23 +300,22 @@ static int fsl_espi_do_trans(struct spi_message *m,
 }
 
 static int fsl_espi_cmd_trans(struct spi_message *m,
-			      struct fsl_espi_transfer *trans, u8 *rx_buff)
+			      struct spi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct fsl_espi_transfer *espi_trans = trans;
 	int ret;
 
 	fsl_espi_copy_to_buf(m, mspi);
 
-	espi_trans->tx_buf = mspi->local_buf;
-	espi_trans->rx_buf = mspi->local_buf;
-	ret = fsl_espi_do_trans(m, espi_trans);
+	trans->tx_buf = mspi->local_buf;
+	trans->rx_buf = mspi->local_buf;
+	ret = fsl_espi_do_trans(m, trans);
 
 	return ret;
 }
 
 static int fsl_espi_rw_trans(struct spi_message *m,
-			     struct fsl_espi_transfer *trans, u8 *rx_buff)
+			     struct spi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
@@ -355,10 +340,9 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
-	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
-	struct fsl_espi_transfer espi_trans;
+	struct spi_transfer *t, trans = {};
 	int ret;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -368,14 +352,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			xfer_len += t->len;
 	}
 
-	espi_trans.len = xfer_len;
+	trans.len = xfer_len;
 
 	if (!rx_buf)
-		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
+		ret = fsl_espi_cmd_trans(m, &trans, NULL);
 	else
-		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
+		ret = fsl_espi_rw_trans(m, &trans, rx_buf);
 
-	m->actual_length = ret ? 0 : espi_trans.len;
+	m->actual_length = ret ? 0 : trans.len;
 
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
-- 
2.9.2


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[PATCH v3 07/15] spi: fsl-espi: merge fsl_espi_cmd_trans and fsl_espi_rw_trans

[Heiner Kallweit]

fsl_espi_cmd_trans and fsl_espi_rw_trans share most of the code so
we can merge them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 33 ++++++---------------------------
 1 file changed, 6 insertions(+), 27 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8554f18..f8a6dd1 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -299,23 +299,8 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	return ret;
 }
 
-static int fsl_espi_cmd_trans(struct spi_message *m,
-			      struct spi_transfer *trans, u8 *rx_buff)
-{
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	int ret;
-
-	fsl_espi_copy_to_buf(m, mspi);
-
-	trans->tx_buf = mspi->local_buf;
-	trans->rx_buf = mspi->local_buf;
-	ret = fsl_espi_do_trans(m, trans);
-
-	return ret;
-}
-
-static int fsl_espi_rw_trans(struct spi_message *m,
-			     struct spi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
+			  u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
@@ -327,12 +312,9 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 	trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, trans);
 
-	if (!ret) {
-		/* If there is at least one RX byte then copy it to rx_buff */
-		if (trans->len > tx_only)
-			memcpy(rx_buff, trans->rx_buf + tx_only,
-			       trans->len - tx_only);
-	}
+	/* If there is at least one RX byte then copy it to rx_buff */
+	if (!ret && rx_buff && trans->len > tx_only)
+		memcpy(rx_buff, trans->rx_buf + tx_only, trans->len - tx_only);
 
 	return ret;
 }
@@ -354,10 +336,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 
 	trans.len = xfer_len;
 
-	if (!rx_buf)
-		ret = fsl_espi_cmd_trans(m, &trans, NULL);
-	else
-		ret = fsl_espi_rw_trans(m, &trans, rx_buf);
+	ret = fsl_espi_trans(m, &trans, rx_buf);
 
 	m->actual_length = ret ? 0 : trans.len;
 
-- 
2.9.2


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[PATCH v3 08/15] spi: fsl-espi: improve return value handling in fsl_espi_bufs

[Heiner Kallweit]

Return a proper status code from fsl_espi_bufs instead of returning
the number of remaining words and let the caller evaluate it.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index f8a6dd1..8d6a570 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -258,7 +258,7 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	/* disable rx ints */
 	mpc8xxx_spi_write_reg(&reg_base->mask, 0);
 
-	return mpc8xxx_spi->count;
+	return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0;
 }
 
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
@@ -288,9 +288,6 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	if (trans->len)
 		ret = fsl_espi_bufs(spi, trans);
 
-	if (ret)
-		ret = -EMSGSIZE;
-
 	if (trans->delay_usecs)
 		udelay(trans->delay_usecs);
 
-- 
2.9.2


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[PATCH v3 09/15] spi: fsl-espi: merge fsl_espi_bufs and fsl_espi_cpu_bufs

[Heiner Kallweit]

fsl_espi_bufs and fsl_espi_cpu_bufs are very small that we can merge them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 27 ++++++++-------------------
 1 file changed, 8 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8d6a570..190ca5c 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -206,31 +206,15 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
 	fsl_espi_change_mode(spi);
 }
 
-static void fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
-		unsigned int len)
-{
-	u32 word;
-	struct fsl_espi_reg *reg_base = mspi->reg_base;
-
-	mspi->count = len;
-
-	/* enable rx ints */
-	mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
-
-	/* transmit word */
-	word = mspi->get_tx(mspi);
-	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
-}
-
 static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 {
 	struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
 	struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
-	unsigned int len = t->len;
+	u32 word;
 	int ret;
 
 	mpc8xxx_spi->len = t->len;
-	len = roundup(len, 4) / 4;
+	mpc8xxx_spi->count = roundup(t->len, 4) / 4;
 
 	mpc8xxx_spi->tx = t->tx_buf;
 	mpc8xxx_spi->rx = t->rx_buf;
@@ -246,7 +230,12 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
-	fsl_espi_cpu_bufs(mpc8xxx_spi, t, len);
+	/* enable rx ints */
+	mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
+
+	/* transmit word */
+	word = mpc8xxx_spi->get_tx(mpc8xxx_spi);
+	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
 
 	/* Won't hang up forever, SPI bus sometimes got lost interrupts... */
 	ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ);
-- 
2.9.2


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[PATCH v3 10/15] spi: fsl-espi: improve the ISR frame

[Heiner Kallweit]

Improve the ISR frame:
- move resetting the event bits to the ISR frame
- change type of parameter irq to int
- make sure that the event bits match at least one bit in the
  interrupt mask register

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 23 ++++++++++-------------
 1 file changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 190ca5c..534dc14 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -451,17 +451,11 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 				&reg_base->event)) & SPIE_NF), 1000, 0);
 		if (!ret) {
 			dev_err(mspi->dev, "tired waiting for SPIE_NF\n");
-
-			/* Clear the SPIE bits */
-			mpc8xxx_spi_write_reg(&reg_base->event, events);
 			complete(&mspi->done);
 			return;
 		}
 	}
 
-	/* Clear the events */
-	mpc8xxx_spi_write_reg(&reg_base->event, events);
-
 	mspi->count -= 1;
 	if (mspi->count) {
 		u32 word = mspi->get_tx(mspi);
@@ -472,23 +466,26 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
 	}
 }
 
-static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
+static irqreturn_t fsl_espi_irq(int irq, void *context_data)
 {
 	struct mpc8xxx_spi *mspi = context_data;
 	struct fsl_espi_reg *reg_base = mspi->reg_base;
-	irqreturn_t ret = IRQ_NONE;
-	u32 events;
+	u32 mask, events;
 
-	/* Get interrupt events(tx/rx) */
+	/* Get interrupt mask and events and check that irq belongs to us */
+	mask = mpc8xxx_spi_read_reg(&reg_base->mask);
 	events = mpc8xxx_spi_read_reg(&reg_base->event);
-	if (events)
-		ret = IRQ_HANDLED;
+	if (!(mask & events))
+		return IRQ_NONE;
 
 	dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events);
 
 	fsl_espi_cpu_irq(mspi, events);
 
-	return ret;
+	/* Clear the events */
+	mpc8xxx_spi_write_reg(&reg_base->event, events);
+
+	return IRQ_HANDLED;
 }
 
 #ifdef CONFIG_PM
-- 
2.9.2


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[PATCH v3 11/15] spi: fsl-espi: factor out initial message checking

[Heiner Kallweit]

Checking the message is currently done at diffrent places in the
driver. Factor it out to fsl_espi_check_message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 43 +++++++++++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 534dc14..a32bc3a 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -98,6 +98,30 @@ static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
 	return tx_only;
 }
 
+static int fsl_espi_check_message(struct spi_message *m)
+{
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
+	struct spi_transfer *t, *first;
+
+	if (m->frame_length > SPCOM_TRANLEN_MAX) {
+		dev_err(mspi->dev, "message too long, size is %u bytes\n",
+			m->frame_length);
+		return -EMSGSIZE;
+	}
+
+	first = list_first_entry(&m->transfers, struct spi_transfer,
+				 transfer_list);
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (first->bits_per_word != t->bits_per_word ||
+		    first->speed_hz != t->speed_hz) {
+			dev_err(mspi->dev, "bits_per_word/speed_hz should be the same for all transfers\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
 static void fsl_espi_change_mode(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@@ -222,11 +246,6 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	reinit_completion(&mpc8xxx_spi->done);
 
 	/* Set SPCOM[CS] and SPCOM[TRANLEN] field */
-	if (t->len > SPCOM_TRANLEN_MAX) {
-		dev_err(mpc8xxx_spi->dev, "Transaction length (%d)"
-				" beyond the SPCOM[TRANLEN] field\n", t->len);
-		return -EINVAL;
-	}
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
@@ -253,20 +272,12 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct spi_transfer *t, *first;
 	int ret = 0;
 
 	first = list_first_entry(&m->transfers, struct spi_transfer,
 			transfer_list);
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if ((first->bits_per_word != t->bits_per_word) ||
-			(first->speed_hz != t->speed_hz)) {
-			dev_err(mspi->dev,
-				"bits_per_word/speed_hz should be same for the same SPI transfer\n");
-			return -EINVAL;
-		}
-
 		trans->speed_hz = t->speed_hz;
 		trans->bits_per_word = t->bits_per_word;
 		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
@@ -313,6 +324,10 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	struct spi_transfer *t, trans = {};
 	int ret;
 
+	ret = fsl_espi_check_message(m);
+	if (ret)
+		goto out;
+
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
@@ -325,7 +340,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	ret = fsl_espi_trans(m, &trans, rx_buf);
 
 	m->actual_length = ret ? 0 : trans.len;
-
+out:
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
 
-- 
2.9.2


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[PATCH v3 12/15] spi: fsl-espi: centralize populating struct spi_transfer

[Heiner Kallweit]

Better structure the code by population all elements of struct
spi_transfer in one place.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index a32bc3a..79c89bf 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -272,17 +272,8 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
-	struct spi_transfer *t, *first;
 	int ret = 0;
 
-	first = list_first_entry(&m->transfers, struct spi_transfer,
-			transfer_list);
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		trans->speed_hz = t->speed_hz;
-		trans->bits_per_word = t->bits_per_word;
-		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
-	}
-
 	fsl_espi_setup_transfer(spi, trans);
 
 	if (trans->len)
@@ -305,8 +296,6 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
 
 	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
-	trans->tx_buf = mspi->local_buf;
-	trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, trans);
 
 	/* If there is at least one RX byte then copy it to rx_buff */
@@ -319,8 +308,9 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	u8 *rx_buf = NULL;
-	unsigned int xfer_len = 0;
+	unsigned int delay_usecs = 0, xfer_len = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
 
@@ -333,9 +323,19 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			rx_buf = t->rx_buf;
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
+		if (t->delay_usecs > delay_usecs)
+			delay_usecs = t->delay_usecs;
 	}
 
+	t = list_first_entry(&m->transfers, struct spi_transfer,
+			     transfer_list);
+
 	trans.len = xfer_len;
+	trans.speed_hz = t->speed_hz;
+	trans.bits_per_word = t->bits_per_word;
+	trans.delay_usecs = delay_usecs;
+	trans.tx_buf = mspi->local_buf;
+	trans.rx_buf = mspi->local_buf;
 
 	ret = fsl_espi_trans(m, &trans, rx_buf);
 
-- 
2.9.2


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[PATCH v3 13/15] spi: fsl-espi: factor out handling of read data

[Heiner Kallweit]

Factor out copying read data to the read buffers in the original
message to a new function fsl_espi_copy_from_buf.
This also allows to simplify fsl_espi_copy_to_buf.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 41 +++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 20 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 79c89bf..88935a3 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -77,25 +77,32 @@ struct fsl_espi_reg {
 
 #define AUTOSUSPEND_TIMEOUT 2000
 
-static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
-					 struct mpc8xxx_spi *mspi)
+static void fsl_espi_copy_to_buf(struct spi_message *m,
+				 struct mpc8xxx_spi *mspi)
 {
-	unsigned int tx_only = 0;
 	struct spi_transfer *t;
 	u8 *buf = mspi->local_buf;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
+		if (t->tx_buf)
 			memcpy(buf, t->tx_buf, t->len);
-			if (!t->rx_buf)
-				tx_only += t->len;
-		} else {
+		else
 			memset(buf, 0, t->len);
-		}
 		buf += t->len;
 	}
+}
+
+static void fsl_espi_copy_from_buf(struct spi_message *m,
+				   struct mpc8xxx_spi *mspi)
+{
+	struct spi_transfer *t;
+	u8 *buf = mspi->local_buf;
 
-	return tx_only;
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (t->rx_buf)
+			memcpy(t->rx_buf, buf, t->len);
+		buf += t->len;
+	}
 }
 
 static int fsl_espi_check_message(struct spi_message *m)
@@ -287,20 +294,17 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	return ret;
 }
 
-static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
-			  u8 *rx_buff)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	unsigned int tx_only;
 	int ret;
 
-	tx_only = fsl_espi_copy_to_buf(m, mspi);
+	fsl_espi_copy_to_buf(m, mspi);
 
 	ret = fsl_espi_do_trans(m, trans);
 
-	/* If there is at least one RX byte then copy it to rx_buff */
-	if (!ret && rx_buff && trans->len > tx_only)
-		memcpy(rx_buff, trans->rx_buf + tx_only, trans->len - tx_only);
+	if (!ret)
+		fsl_espi_copy_from_buf(m, mspi);
 
 	return ret;
 }
@@ -309,7 +313,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	u8 *rx_buf = NULL;
 	unsigned int delay_usecs = 0, xfer_len = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
@@ -319,8 +322,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		goto out;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->rx_buf)
-			rx_buf = t->rx_buf;
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
 		if (t->delay_usecs > delay_usecs)
@@ -337,7 +338,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	trans.tx_buf = mspi->local_buf;
 	trans.rx_buf = mspi->local_buf;
 
-	ret = fsl_espi_trans(m, &trans, rx_buf);
+	ret = fsl_espi_trans(m, &trans);
 
 	m->actual_length = ret ? 0 : trans.len;
 out:
-- 
2.9.2


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[PATCH v3 14/15] spi: fsl-espi: improve message length handling

[Heiner Kallweit]

Move checking for a zero-length message up in the call chain and
use m->frame_length instead of re-calculating the overall length
of all transfers in the message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 88935a3..84355bb 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -283,8 +283,7 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 
 	fsl_espi_setup_transfer(spi, trans);
 
-	if (trans->len)
-		ret = fsl_espi_bufs(spi, trans);
+	ret = fsl_espi_bufs(spi, trans);
 
 	if (trans->delay_usecs)
 		udelay(trans->delay_usecs);
@@ -313,7 +312,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	unsigned int delay_usecs = 0, xfer_len = 0;
+	unsigned int delay_usecs = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
 
@@ -322,8 +321,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		goto out;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if ((t->tx_buf) || (t->rx_buf))
-			xfer_len += t->len;
 		if (t->delay_usecs > delay_usecs)
 			delay_usecs = t->delay_usecs;
 	}
@@ -331,14 +328,15 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	t = list_first_entry(&m->transfers, struct spi_transfer,
 			     transfer_list);
 
-	trans.len = xfer_len;
+	trans.len = m->frame_length;
 	trans.speed_hz = t->speed_hz;
 	trans.bits_per_word = t->bits_per_word;
 	trans.delay_usecs = delay_usecs;
 	trans.tx_buf = mspi->local_buf;
 	trans.rx_buf = mspi->local_buf;
 
-	ret = fsl_espi_trans(m, &trans);
+	if (trans.len)
+		ret = fsl_espi_trans(m, &trans);
 
 	m->actual_length = ret ? 0 : trans.len;
 out:
-- 
2.9.2


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[PATCH v3 15/15] spi: fsl-espi: merge fsl_espi_trans and fsl_espi_do_trans

[Heiner Kallweit]

Merge both functions to reduce source code size and improve
readability.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
v2:
- rebased
v3:
- new numbering
---
 drivers/spi/spi-fsl-espi.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 84355bb..f7d682f 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -276,11 +276,13 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0;
 }
 
-static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_device *spi = m->spi;
-	int ret = 0;
+	int ret;
 
+	fsl_espi_copy_to_buf(m, mspi);
 	fsl_espi_setup_transfer(spi, trans);
 
 	ret = fsl_espi_bufs(spi, trans);
@@ -290,18 +292,6 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 
 	fsl_espi_setup_transfer(spi, NULL);
 
-	return ret;
-}
-
-static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
-{
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	int ret;
-
-	fsl_espi_copy_to_buf(m, mspi);
-
-	ret = fsl_espi_do_trans(m, trans);
-
 	if (!ret)
 		fsl_espi_copy_from_buf(m, mspi);
 
-- 
2.9.2


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Applied "spi: fsl-espi: merge fsl_espi_trans and fsl_espi_do_trans" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: merge fsl_espi_trans and fsl_espi_do_trans

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 38d003f1a43f3afd6b5e0da728f06dad07a85687 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:54:51 +0200
Subject: [PATCH] spi: fsl-espi: merge fsl_espi_trans and fsl_espi_do_trans

Merge both functions to reduce source code size and improve
readability.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 7b2f997b061f..bef06762a770 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -276,11 +276,13 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0;
 }
 
-static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_device *spi = m->spi;
-	int ret = 0;
+	int ret;
 
+	fsl_espi_copy_to_buf(m, mspi);
 	fsl_espi_setup_transfer(spi, trans);
 
 	ret = fsl_espi_bufs(spi, trans);
@@ -290,18 +292,6 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 
 	fsl_espi_setup_transfer(spi, NULL);
 
-	return ret;
-}
-
-static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
-{
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	int ret;
-
-	fsl_espi_copy_to_buf(m, mspi);
-
-	ret = fsl_espi_do_trans(m, trans);
-
 	if (!ret)
 		fsl_espi_copy_from_buf(m, mspi);
 
-- 
2.8.1

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Applied "spi: fsl-espi: improve message length handling" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: improve message length handling

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 06af115d6c6d8b3d7b6cbc8a46f0603e70b1be58 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:54:35 +0200
Subject: [PATCH] spi: fsl-espi: improve message length handling

Move checking for a zero-length message up in the call chain and
use m->frame_length instead of re-calculating the overall length
of all transfers in the message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 2af7463aea8d..7b2f997b061f 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -283,8 +283,7 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 
 	fsl_espi_setup_transfer(spi, trans);
 
-	if (trans->len)
-		ret = fsl_espi_bufs(spi, trans);
+	ret = fsl_espi_bufs(spi, trans);
 
 	if (trans->delay_usecs)
 		udelay(trans->delay_usecs);
@@ -313,7 +312,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	unsigned int delay_usecs = 0, xfer_len = 0;
+	unsigned int delay_usecs = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
 
@@ -322,8 +321,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		goto out;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if ((t->tx_buf) || (t->rx_buf))
-			xfer_len += t->len;
 		if (t->delay_usecs > delay_usecs)
 			delay_usecs = t->delay_usecs;
 	}
@@ -331,14 +328,15 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	t = list_first_entry(&m->transfers, struct spi_transfer,
 			     transfer_list);
 
-	trans.len = xfer_len;
+	trans.len = m->frame_length;
 	trans.speed_hz = t->speed_hz;
 	trans.bits_per_word = t->bits_per_word;
 	trans.delay_usecs = delay_usecs;
 	trans.tx_buf = mspi->local_buf;
 	trans.rx_buf = mspi->local_buf;
 
-	ret = fsl_espi_trans(m, &trans);
+	if (trans.len)
+		ret = fsl_espi_trans(m, &trans);
 
 	m->actual_length = ret ? 0 : trans.len;
 out:
-- 
2.8.1

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Applied "spi: fsl-espi: factor out handling of read data" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: factor out handling of read data

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From cce7e3a2fe39a5b66162a3dc1463a1af598d0803 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:54:18 +0200
Subject: [PATCH] spi: fsl-espi: factor out handling of read data

Factor out copying read data to the read buffers in the original
message to a new function fsl_espi_copy_from_buf.
This also allows to simplify fsl_espi_copy_to_buf.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 41 +++++++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 20 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 7fc9a2c66396..2af7463aea8d 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -77,25 +77,32 @@ struct fsl_espi_reg {
 
 #define AUTOSUSPEND_TIMEOUT 2000
 
-static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
-					 struct mpc8xxx_spi *mspi)
+static void fsl_espi_copy_to_buf(struct spi_message *m,
+				 struct mpc8xxx_spi *mspi)
 {
-	unsigned int tx_only = 0;
 	struct spi_transfer *t;
 	u8 *buf = mspi->local_buf;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
+		if (t->tx_buf)
 			memcpy(buf, t->tx_buf, t->len);
-			if (!t->rx_buf)
-				tx_only += t->len;
-		} else {
+		else
 			memset(buf, 0, t->len);
-		}
 		buf += t->len;
 	}
+}
+
+static void fsl_espi_copy_from_buf(struct spi_message *m,
+				   struct mpc8xxx_spi *mspi)
+{
+	struct spi_transfer *t;
+	u8 *buf = mspi->local_buf;
 
-	return tx_only;
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (t->rx_buf)
+			memcpy(t->rx_buf, buf, t->len);
+		buf += t->len;
+	}
 }
 
 static int fsl_espi_check_message(struct spi_message *m)
@@ -287,20 +294,17 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	return ret;
 }
 
-static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
-			  u8 *rx_buff)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	unsigned int tx_only;
 	int ret;
 
-	tx_only = fsl_espi_copy_to_buf(m, mspi);
+	fsl_espi_copy_to_buf(m, mspi);
 
 	ret = fsl_espi_do_trans(m, trans);
 
-	/* If there is at least one RX byte then copy it to rx_buff */
-	if (!ret && rx_buff && trans->len > tx_only)
-		memcpy(rx_buff, trans->rx_buf + tx_only, trans->len - tx_only);
+	if (!ret)
+		fsl_espi_copy_from_buf(m, mspi);
 
 	return ret;
 }
@@ -309,7 +313,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	u8 *rx_buf = NULL;
 	unsigned int delay_usecs = 0, xfer_len = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
@@ -319,8 +322,6 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		goto out;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->rx_buf)
-			rx_buf = t->rx_buf;
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
 		if (t->delay_usecs > delay_usecs)
@@ -337,7 +338,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	trans.tx_buf = mspi->local_buf;
 	trans.rx_buf = mspi->local_buf;
 
-	ret = fsl_espi_trans(m, &trans, rx_buf);
+	ret = fsl_espi_trans(m, &trans);
 
 	m->actual_length = ret ? 0 : trans.len;
 out:
-- 
2.8.1

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Applied "spi: fsl-espi: centralize populating struct spi_transfer" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: centralize populating struct spi_transfer

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 96361fafbbfc8a07b4c7ec09d96d742ef68bfbad Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:54:00 +0200
Subject: [PATCH] spi: fsl-espi: centralize populating struct spi_transfer

Better structure the code by population all elements of struct
spi_transfer in one place.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 2bfaff64beb8..7fc9a2c66396 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -272,17 +272,8 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
-	struct spi_transfer *t, *first;
 	int ret = 0;
 
-	first = list_first_entry(&m->transfers, struct spi_transfer,
-			transfer_list);
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		trans->speed_hz = t->speed_hz;
-		trans->bits_per_word = t->bits_per_word;
-		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
-	}
-
 	fsl_espi_setup_transfer(spi, trans);
 
 	if (trans->len)
@@ -305,8 +296,6 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
 
 	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
-	trans->tx_buf = mspi->local_buf;
-	trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, trans);
 
 	/* If there is at least one RX byte then copy it to rx_buff */
@@ -319,8 +308,9 @@ static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	u8 *rx_buf = NULL;
-	unsigned int xfer_len = 0;
+	unsigned int delay_usecs = 0, xfer_len = 0;
 	struct spi_transfer *t, trans = {};
 	int ret;
 
@@ -333,9 +323,19 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			rx_buf = t->rx_buf;
 		if ((t->tx_buf) || (t->rx_buf))
 			xfer_len += t->len;
+		if (t->delay_usecs > delay_usecs)
+			delay_usecs = t->delay_usecs;
 	}
 
+	t = list_first_entry(&m->transfers, struct spi_transfer,
+			     transfer_list);
+
 	trans.len = xfer_len;
+	trans.speed_hz = t->speed_hz;
+	trans.bits_per_word = t->bits_per_word;
+	trans.delay_usecs = delay_usecs;
+	trans.tx_buf = mspi->local_buf;
+	trans.rx_buf = mspi->local_buf;
 
 	ret = fsl_espi_trans(m, &trans, rx_buf);
 
-- 
2.8.1

--
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Applied "spi: fsl-espi: factor out initial message checking" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: factor out initial message checking

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From d3152cf1c8cf3f75d8eb82ae399ea4b35a0df8d4 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:53:38 +0200
Subject: [PATCH] spi: fsl-espi: factor out initial message checking

Checking the message is currently done at diffrent places in the
driver. Factor it out to fsl_espi_check_message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 43 +++++++++++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 14 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 190ca5ccf834..2bfaff64beb8 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -98,6 +98,30 @@ static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
 	return tx_only;
 }
 
+static int fsl_espi_check_message(struct spi_message *m)
+{
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
+	struct spi_transfer *t, *first;
+
+	if (m->frame_length > SPCOM_TRANLEN_MAX) {
+		dev_err(mspi->dev, "message too long, size is %u bytes\n",
+			m->frame_length);
+		return -EMSGSIZE;
+	}
+
+	first = list_first_entry(&m->transfers, struct spi_transfer,
+				 transfer_list);
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (first->bits_per_word != t->bits_per_word ||
+		    first->speed_hz != t->speed_hz) {
+			dev_err(mspi->dev, "bits_per_word/speed_hz should be the same for all transfers\n");
+			return -EINVAL;
+		}
+	}
+
+	return 0;
+}
+
 static void fsl_espi_change_mode(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@@ -222,11 +246,6 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	reinit_completion(&mpc8xxx_spi->done);
 
 	/* Set SPCOM[CS] and SPCOM[TRANLEN] field */
-	if (t->len > SPCOM_TRANLEN_MAX) {
-		dev_err(mpc8xxx_spi->dev, "Transaction length (%d)"
-				" beyond the SPCOM[TRANLEN] field\n", t->len);
-		return -EINVAL;
-	}
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
@@ -253,20 +272,12 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct spi_transfer *t, *first;
 	int ret = 0;
 
 	first = list_first_entry(&m->transfers, struct spi_transfer,
 			transfer_list);
 	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if ((first->bits_per_word != t->bits_per_word) ||
-			(first->speed_hz != t->speed_hz)) {
-			dev_err(mspi->dev,
-				"bits_per_word/speed_hz should be same for the same SPI transfer\n");
-			return -EINVAL;
-		}
-
 		trans->speed_hz = t->speed_hz;
 		trans->bits_per_word = t->bits_per_word;
 		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
@@ -313,6 +324,10 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	struct spi_transfer *t, trans = {};
 	int ret;
 
+	ret = fsl_espi_check_message(m);
+	if (ret)
+		goto out;
+
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
@@ -325,7 +340,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	ret = fsl_espi_trans(m, &trans, rx_buf);
 
 	m->actual_length = ret ? 0 : trans.len;
-
+out:
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
 
-- 
2.8.1

--
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Applied "spi: fsl-espi: merge fsl_espi_bufs and fsl_espi_cpu_bufs" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: merge fsl_espi_bufs and fsl_espi_cpu_bufs

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 5bcc6a2f061266060e0b144302e83e614f683cd7 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:53:01 +0200
Subject: [PATCH] spi: fsl-espi: merge fsl_espi_bufs and fsl_espi_cpu_bufs

fsl_espi_bufs and fsl_espi_cpu_bufs are very small that we can merge them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 27 ++++++++-------------------
 1 file changed, 8 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8d6a570ac704..190ca5ccf834 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -206,31 +206,15 @@ static void fsl_espi_setup_transfer(struct spi_device *spi,
 	fsl_espi_change_mode(spi);
 }
 
-static void fsl_espi_cpu_bufs(struct mpc8xxx_spi *mspi, struct spi_transfer *t,
-		unsigned int len)
-{
-	u32 word;
-	struct fsl_espi_reg *reg_base = mspi->reg_base;
-
-	mspi->count = len;
-
-	/* enable rx ints */
-	mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
-
-	/* transmit word */
-	word = mspi->get_tx(mspi);
-	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
-}
-
 static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 {
 	struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
 	struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
-	unsigned int len = t->len;
+	u32 word;
 	int ret;
 
 	mpc8xxx_spi->len = t->len;
-	len = roundup(len, 4) / 4;
+	mpc8xxx_spi->count = roundup(t->len, 4) / 4;
 
 	mpc8xxx_spi->tx = t->tx_buf;
 	mpc8xxx_spi->rx = t->rx_buf;
@@ -246,7 +230,12 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	mpc8xxx_spi_write_reg(&reg_base->command,
 		(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
 
-	fsl_espi_cpu_bufs(mpc8xxx_spi, t, len);
+	/* enable rx ints */
+	mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
+
+	/* transmit word */
+	word = mpc8xxx_spi->get_tx(mpc8xxx_spi);
+	mpc8xxx_spi_write_reg(&reg_base->transmit, word);
 
 	/* Won't hang up forever, SPI bus sometimes got lost interrupts... */
 	ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ);
-- 
2.8.1

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Applied "spi: fsl-espi: improve return value handling in fsl_espi_bufs" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: improve return value handling in fsl_espi_bufs

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 84ccfc371f4a8d1ff86efd7ca7914e33b90325c2 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:52:43 +0200
Subject: [PATCH] spi: fsl-espi: improve return value handling in fsl_espi_bufs

Return a proper status code from fsl_espi_bufs instead of returning
the number of remaining words and let the caller evaluate it.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index f8a6dd13ee02..8d6a570ac704 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -258,7 +258,7 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	/* disable rx ints */
 	mpc8xxx_spi_write_reg(&reg_base->mask, 0);
 
-	return mpc8xxx_spi->count;
+	return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0;
 }
 
 static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
@@ -288,9 +288,6 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	if (trans->len)
 		ret = fsl_espi_bufs(spi, trans);
 
-	if (ret)
-		ret = -EMSGSIZE;
-
 	if (trans->delay_usecs)
 		udelay(trans->delay_usecs);
 
-- 
2.8.1

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Applied "spi: fsl-espi: merge fsl_espi_cmd_trans and fsl_espi_rw_trans" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: merge fsl_espi_cmd_trans and fsl_espi_rw_trans

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 809b1e017bbdaf40d35619e41c1dbc542a5449d2 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:52:25 +0200
Subject: [PATCH] spi: fsl-espi: merge fsl_espi_cmd_trans and fsl_espi_rw_trans

fsl_espi_cmd_trans and fsl_espi_rw_trans share most of the code so
we can merge them.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 33 ++++++---------------------------
 1 file changed, 6 insertions(+), 27 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8554f18e4cf6..f8a6dd13ee02 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -299,23 +299,8 @@ static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 	return ret;
 }
 
-static int fsl_espi_cmd_trans(struct spi_message *m,
-			      struct spi_transfer *trans, u8 *rx_buff)
-{
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	int ret;
-
-	fsl_espi_copy_to_buf(m, mspi);
-
-	trans->tx_buf = mspi->local_buf;
-	trans->rx_buf = mspi->local_buf;
-	ret = fsl_espi_do_trans(m, trans);
-
-	return ret;
-}
-
-static int fsl_espi_rw_trans(struct spi_message *m,
-			     struct spi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans,
+			  u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
@@ -327,12 +312,9 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 	trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, trans);
 
-	if (!ret) {
-		/* If there is at least one RX byte then copy it to rx_buff */
-		if (trans->len > tx_only)
-			memcpy(rx_buff, trans->rx_buf + tx_only,
-			       trans->len - tx_only);
-	}
+	/* If there is at least one RX byte then copy it to rx_buff */
+	if (!ret && rx_buff && trans->len > tx_only)
+		memcpy(rx_buff, trans->rx_buf + tx_only, trans->len - tx_only);
 
 	return ret;
 }
@@ -354,10 +336,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 
 	trans.len = xfer_len;
 
-	if (!rx_buf)
-		ret = fsl_espi_cmd_trans(m, &trans, NULL);
-	else
-		ret = fsl_espi_rw_trans(m, &trans, rx_buf);
+	ret = fsl_espi_trans(m, &trans, rx_buf);
 
 	m->actual_length = ret ? 0 : trans.len;
 
-- 
2.8.1

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Applied "spi: fsl-espi: eliminate struct fsl_espi_transfer" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: eliminate struct fsl_espi_transfer

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From faceef390702bad8bdf9c93554a3364253d9d943 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:52:06 +0200
Subject: [PATCH] spi: fsl-espi: eliminate struct fsl_espi_transfer

The remaining elements of struct fsl_espi_transfer are part of struct
spi_transfer anyway. So we can get rid of struct fsl_espi_transfer
and use a struct spi_transfer only.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 56 +++++++++++++++++-----------------------------
 1 file changed, 20 insertions(+), 36 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 726d5fdca3b6..8554f18e4cf6 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -37,12 +37,6 @@ struct fsl_espi_reg {
 	__be32 csmode[4];	/* 0x020 - 0x02c eSPI cs mode register */
 };
 
-struct fsl_espi_transfer {
-	const void *tx_buf;
-	void *rx_buf;
-	unsigned len;
-};
-
 /* eSPI Controller mode register definitions */
 #define SPMODE_ENABLE		(1 << 31)
 #define SPMODE_LOOP		(1 << 30)
@@ -267,17 +261,13 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count;
 }
 
-static int fsl_espi_do_trans(struct spi_message *m,
-			     struct fsl_espi_transfer *tr)
+static int fsl_espi_do_trans(struct spi_message *m, struct spi_transfer *trans)
 {
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
-	struct fsl_espi_transfer *espi_trans = tr;
-	struct spi_transfer *t, *first, trans;
+	struct spi_transfer *t, *first;
 	int ret = 0;
 
-	memset(&trans, 0, sizeof(trans));
-
 	first = list_first_entry(&m->transfers, struct spi_transfer,
 			transfer_list);
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -288,25 +278,21 @@ static int fsl_espi_do_trans(struct spi_message *m,
 			return -EINVAL;
 		}
 
-		trans.speed_hz = t->speed_hz;
-		trans.bits_per_word = t->bits_per_word;
-		trans.delay_usecs = max(first->delay_usecs, t->delay_usecs);
+		trans->speed_hz = t->speed_hz;
+		trans->bits_per_word = t->bits_per_word;
+		trans->delay_usecs = max(first->delay_usecs, t->delay_usecs);
 	}
 
-	trans.len = espi_trans->len;
-	trans.tx_buf = espi_trans->tx_buf;
-	trans.rx_buf = espi_trans->rx_buf;
-
-	fsl_espi_setup_transfer(spi, &trans);
+	fsl_espi_setup_transfer(spi, trans);
 
-	if (trans.len)
-		ret = fsl_espi_bufs(spi, &trans);
+	if (trans->len)
+		ret = fsl_espi_bufs(spi, trans);
 
 	if (ret)
 		ret = -EMSGSIZE;
 
-	if (trans.delay_usecs)
-		udelay(trans.delay_usecs);
+	if (trans->delay_usecs)
+		udelay(trans->delay_usecs);
 
 	fsl_espi_setup_transfer(spi, NULL);
 
@@ -314,23 +300,22 @@ static int fsl_espi_do_trans(struct spi_message *m,
 }
 
 static int fsl_espi_cmd_trans(struct spi_message *m,
-			      struct fsl_espi_transfer *trans, u8 *rx_buff)
+			      struct spi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct fsl_espi_transfer *espi_trans = trans;
 	int ret;
 
 	fsl_espi_copy_to_buf(m, mspi);
 
-	espi_trans->tx_buf = mspi->local_buf;
-	espi_trans->rx_buf = mspi->local_buf;
-	ret = fsl_espi_do_trans(m, espi_trans);
+	trans->tx_buf = mspi->local_buf;
+	trans->rx_buf = mspi->local_buf;
+	ret = fsl_espi_do_trans(m, trans);
 
 	return ret;
 }
 
 static int fsl_espi_rw_trans(struct spi_message *m,
-			     struct fsl_espi_transfer *trans, u8 *rx_buff)
+			     struct spi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
@@ -355,10 +340,9 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
-	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
-	struct fsl_espi_transfer espi_trans;
+	struct spi_transfer *t, trans = {};
 	int ret;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
@@ -368,14 +352,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 			xfer_len += t->len;
 	}
 
-	espi_trans.len = xfer_len;
+	trans.len = xfer_len;
 
 	if (!rx_buf)
-		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
+		ret = fsl_espi_cmd_trans(m, &trans, NULL);
 	else
-		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
+		ret = fsl_espi_rw_trans(m, &trans, rx_buf);
 
-	m->actual_length = ret ? 0 : espi_trans.len;
+	m->actual_length = ret ? 0 : trans.len;
 
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
-- 
2.8.1

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Applied "spi: fsl-espi: remove element actual_length from struct fsl_espi_trans" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: remove element actual_length from struct fsl_espi_trans

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 5cd7b8be6b7b4c4fb9e2bfbfba596d27357cc359 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:51:48 +0200
Subject: [PATCH] spi: fsl-espi: remove element actual_length from struct
 fsl_espi_trans

If an error occurs during processing the message, then we don't have
to populate the actual_length element of struct message.
So we can get rid of element actual_length in struct
fsl_espi_transfer.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 6b60f7b29869..726d5fdca3b6 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -41,7 +41,6 @@ struct fsl_espi_transfer {
 	const void *tx_buf;
 	void *rx_buf;
 	unsigned len;
-	unsigned actual_length;
 };
 
 /* eSPI Controller mode register definitions */
@@ -327,8 +326,6 @@ static int fsl_espi_cmd_trans(struct spi_message *m,
 	espi_trans->rx_buf = mspi->local_buf;
 	ret = fsl_espi_do_trans(m, espi_trans);
 
-	espi_trans->actual_length = espi_trans->len;
-
 	return ret;
 }
 
@@ -350,7 +347,6 @@ static int fsl_espi_rw_trans(struct spi_message *m,
 		if (trans->len > tx_only)
 			memcpy(rx_buff, trans->rx_buf + tx_only,
 			       trans->len - tx_only);
-		trans->actual_length += trans->len;
 	}
 
 	return ret;
@@ -373,14 +369,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	}
 
 	espi_trans.len = xfer_len;
-	espi_trans.actual_length = 0;
 
 	if (!rx_buf)
 		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
 	else
 		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
-	m->actual_length = espi_trans.actual_length;
+	m->actual_length = ret ? 0 : espi_trans.len;
+
 	if (m->status == -EINPROGRESS)
 		m->status = ret;
 
-- 
2.8.1

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Applied "spi: fsl-espi: fix status handling in fsl_espi_do_one_msg" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: fix status handling in fsl_espi_do_one_msg

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 0319d4991ea6e7594f32843e1b47868737056799 Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:51:29 +0200
Subject: [PATCH] spi: fsl-espi: fix status handling in fsl_espi_do_one_msg

If an error occurred during message handling return this error instead
of always returning 0 and align the code with the generic
implementation in spi_transfer_one_message.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 5f01b6595442..6b60f7b29869 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -381,9 +381,12 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
 	m->actual_length = espi_trans.actual_length;
-	m->status = ret;
+	if (m->status == -EINPROGRESS)
+		m->status = ret;
+
 	spi_finalize_current_message(master);
-	return 0;
+
+	return ret;
 }
 
 static int fsl_espi_setup(struct spi_device *spi)
-- 
2.8.1

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Applied "spi: fsl-espi: remove element status from struct fsl_espi_transfer" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: remove element status from struct fsl_espi_transfer

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From e33a3ade909194ec2ca633a53b428d4dac853f8a Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:51:10 +0200
Subject: [PATCH] spi: fsl-espi: remove element status from struct
 fsl_espi_transfer

Use the return values of the functions in the call chain to transport
status information instead of using an element in struct
fsl_espi_transfer for this.

This is more in line with the general approach how to handle status
information and is one step further to eventually get rid of
struct fsl_espi_transfer completely.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 47 +++++++++++++++++++++++++---------------------
 1 file changed, 26 insertions(+), 21 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 8e6ef9b153d7..5f01b6595442 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -42,7 +42,6 @@ struct fsl_espi_transfer {
 	void *rx_buf;
 	unsigned len;
 	unsigned actual_length;
-	int status;
 };
 
 /* eSPI Controller mode register definitions */
@@ -269,14 +268,14 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
 	return mpc8xxx_spi->count;
 }
 
-static void fsl_espi_do_trans(struct spi_message *m,
-				struct fsl_espi_transfer *tr)
+static int fsl_espi_do_trans(struct spi_message *m,
+			     struct fsl_espi_transfer *tr)
 {
 	struct spi_device *spi = m->spi;
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
 	struct fsl_espi_transfer *espi_trans = tr;
 	struct spi_transfer *t, *first, trans;
-	int status = 0;
+	int ret = 0;
 
 	memset(&trans, 0, sizeof(trans));
 
@@ -285,10 +284,9 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if ((first->bits_per_word != t->bits_per_word) ||
 			(first->speed_hz != t->speed_hz)) {
-			espi_trans->status = -EINVAL;
 			dev_err(mspi->dev,
 				"bits_per_word/speed_hz should be same for the same SPI transfer\n");
-			return;
+			return -EINVAL;
 		}
 
 		trans.speed_hz = t->speed_hz;
@@ -303,52 +301,59 @@ static void fsl_espi_do_trans(struct spi_message *m,
 	fsl_espi_setup_transfer(spi, &trans);
 
 	if (trans.len)
-		status = fsl_espi_bufs(spi, &trans);
+		ret = fsl_espi_bufs(spi, &trans);
 
-	if (status)
-		status = -EMSGSIZE;
+	if (ret)
+		ret = -EMSGSIZE;
 
 	if (trans.delay_usecs)
 		udelay(trans.delay_usecs);
 
-	espi_trans->status = status;
 	fsl_espi_setup_transfer(spi, NULL);
+
+	return ret;
 }
 
-static void fsl_espi_cmd_trans(struct spi_message *m,
-				struct fsl_espi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_cmd_trans(struct spi_message *m,
+			      struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct fsl_espi_transfer *espi_trans = trans;
+	int ret;
 
 	fsl_espi_copy_to_buf(m, mspi);
 
 	espi_trans->tx_buf = mspi->local_buf;
 	espi_trans->rx_buf = mspi->local_buf;
-	fsl_espi_do_trans(m, espi_trans);
+	ret = fsl_espi_do_trans(m, espi_trans);
 
 	espi_trans->actual_length = espi_trans->len;
+
+	return ret;
 }
 
-static void fsl_espi_rw_trans(struct spi_message *m,
-				struct fsl_espi_transfer *trans, u8 *rx_buff)
+static int fsl_espi_rw_trans(struct spi_message *m,
+			     struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	unsigned int tx_only;
+	int ret;
 
 	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
 	trans->tx_buf = mspi->local_buf;
 	trans->rx_buf = mspi->local_buf;
-	fsl_espi_do_trans(m, trans);
+	ret = fsl_espi_do_trans(m, trans);
 
-	if (!trans->status) {
+	if (!ret) {
 		/* If there is at least one RX byte then copy it to rx_buff */
 		if (trans->len > tx_only)
 			memcpy(rx_buff, trans->rx_buf + tx_only,
 			       trans->len - tx_only);
 		trans->actual_length += trans->len;
 	}
+
+	return ret;
 }
 
 static int fsl_espi_do_one_msg(struct spi_master *master,
@@ -358,6 +363,7 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
+	int ret;
 
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
@@ -368,15 +374,14 @@ static int fsl_espi_do_one_msg(struct spi_master *master,
 
 	espi_trans.len = xfer_len;
 	espi_trans.actual_length = 0;
-	espi_trans.status = 0;
 
 	if (!rx_buf)
-		fsl_espi_cmd_trans(m, &espi_trans, NULL);
+		ret = fsl_espi_cmd_trans(m, &espi_trans, NULL);
 	else
-		fsl_espi_rw_trans(m, &espi_trans, rx_buf);
+		ret = fsl_espi_rw_trans(m, &espi_trans, rx_buf);
 
 	m->actual_length = espi_trans.actual_length;
-	m->status = espi_trans.status;
+	m->status = ret;
 	spi_finalize_current_message(master);
 	return 0;
 }
-- 
2.8.1

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Applied "spi: fsl-espi: factor out filling the local buffer" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: factor out filling the local buffer

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 7c159aa8c103b02a8434ae18b22048952c796e6f Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:50:53 +0200
Subject: [PATCH] spi: fsl-espi: factor out filling the local buffer

Better structure the code by factoring out filling the local buffer.

In addition don't initialize the complete local buffer at the
beginning of fsl_espi_do_one_msg. Instead move initialization of
those parts of the local buffer to be used for transfers w/o tx_buf
to fsl_espi_copy_to_buf.

Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 46 ++++++++++++++++++++++++----------------------
 1 file changed, 24 insertions(+), 22 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 81d7416668b8..8e6ef9b153d7 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -85,6 +85,27 @@ struct fsl_espi_transfer {
 
 #define AUTOSUSPEND_TIMEOUT 2000
 
+static unsigned int fsl_espi_copy_to_buf(struct spi_message *m,
+					 struct mpc8xxx_spi *mspi)
+{
+	unsigned int tx_only = 0;
+	struct spi_transfer *t;
+	u8 *buf = mspi->local_buf;
+
+	list_for_each_entry(t, &m->transfers, transfer_list) {
+		if (t->tx_buf) {
+			memcpy(buf, t->tx_buf, t->len);
+			if (!t->rx_buf)
+				tx_only += t->len;
+		} else {
+			memset(buf, 0, t->len);
+		}
+		buf += t->len;
+	}
+
+	return tx_only;
+}
+
 static void fsl_espi_change_mode(struct spi_device *spi)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@@ -298,16 +319,9 @@ static void fsl_espi_cmd_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct spi_transfer *t;
-	int i = 0;
 	struct fsl_espi_transfer *espi_trans = trans;
 
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
-			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
-			i += t->len;
-		}
-	}
+	fsl_espi_copy_to_buf(m, mspi);
 
 	espi_trans->tx_buf = mspi->local_buf;
 	espi_trans->rx_buf = mspi->local_buf;
@@ -320,18 +334,9 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
 	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
-	struct spi_transfer *t;
-	unsigned int tx_only = 0;
-	int i = 0;
+	unsigned int tx_only;
 
-	list_for_each_entry(t, &m->transfers, transfer_list) {
-		if (t->tx_buf) {
-			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
-			i += t->len;
-			if (!t->rx_buf)
-				tx_only += t->len;
-		}
-	}
+	tx_only = fsl_espi_copy_to_buf(m, mspi);
 
 	trans->tx_buf = mspi->local_buf;
 	trans->rx_buf = mspi->local_buf;
@@ -349,14 +354,11 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
-	struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
-	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
-- 
2.8.1

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Applied "spi: fsl-espi: pre-allocate message buffer" to the spi tree

[Mark Brown]

The patch

   spi: fsl-espi: pre-allocate message buffer

has been applied to the spi tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From 1423877b73ed5f4982eaba8bed359605b9918a2b Mon Sep 17 00:00:00 2001
From: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Wed, 7 Sep 2016 22:50:22 +0200
Subject: [PATCH] spi: fsl-espi: pre-allocate message buffer

Currently the driver allocates a 64kb buffer for each single message.
On systems with little and fragmented memory this can result in
memory allocation errors. Solve this by pre-allocating a buffer.

This patch was developed in OpenWRT long ago, however it never
made it upstream.

I slightly modified the original patch to re-initialize the buffer
at the beginning of each transfer.

Signed-off-by: Gabor Juhos <juhosg-p3rKhJxN3npAfugRpC6u6w@public.gmane.org>
Signed-off-by: Felix Fietkau <nbd-Vt+b4OUoWG0@public.gmane.org>
Signed-off-by: Heiner Kallweit <hkallweit1-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Signed-off-by: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 drivers/spi/spi-fsl-espi.c | 41 ++++++++++++++++++-----------------------
 drivers/spi/spi-fsl-lib.h  |  1 +
 2 files changed, 19 insertions(+), 23 deletions(-)

diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c
index 16fff7237ab2..81d7416668b8 100644
--- a/drivers/spi/spi-fsl-espi.c
+++ b/drivers/spi/spi-fsl-espi.c
@@ -297,57 +297,44 @@ static void fsl_espi_do_trans(struct spi_message *m,
 static void fsl_espi_cmd_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_transfer *t;
-	u8 *local_buf;
 	int i = 0;
 	struct fsl_espi_transfer *espi_trans = trans;
 
-	local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!local_buf) {
-		espi_trans->status = -ENOMEM;
-		return;
-	}
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf) {
-			memcpy(local_buf + i, t->tx_buf, t->len);
+			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
 			i += t->len;
 		}
 	}
 
-	espi_trans->tx_buf = local_buf;
-	espi_trans->rx_buf = local_buf;
+	espi_trans->tx_buf = mspi->local_buf;
+	espi_trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, espi_trans);
 
 	espi_trans->actual_length = espi_trans->len;
-	kfree(local_buf);
 }
 
 static void fsl_espi_rw_trans(struct spi_message *m,
 				struct fsl_espi_transfer *trans, u8 *rx_buff)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
 	struct spi_transfer *t;
-	u8 *local_buf;
 	unsigned int tx_only = 0;
 	int i = 0;
 
-	local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
-	if (!local_buf) {
-		trans->status = -ENOMEM;
-		return;
-	}
-
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->tx_buf) {
-			memcpy(local_buf + i, t->tx_buf, t->len);
+			memcpy(mspi->local_buf + i, t->tx_buf, t->len);
 			i += t->len;
 			if (!t->rx_buf)
 				tx_only += t->len;
 		}
 	}
 
-	trans->tx_buf = local_buf;
-	trans->rx_buf = local_buf;
+	trans->tx_buf = mspi->local_buf;
+	trans->rx_buf = mspi->local_buf;
 	fsl_espi_do_trans(m, trans);
 
 	if (!trans->status) {
@@ -357,18 +344,19 @@ static void fsl_espi_rw_trans(struct spi_message *m,
 			       trans->len - tx_only);
 		trans->actual_length += trans->len;
 	}
-
-	kfree(local_buf);
 }
 
 static int fsl_espi_do_one_msg(struct spi_master *master,
 			       struct spi_message *m)
 {
+	struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
 	struct spi_transfer *t;
 	u8 *rx_buf = NULL;
 	unsigned int xfer_len = 0;
 	struct fsl_espi_transfer espi_trans;
 
+	memset(mspi->local_buf, 0, SPCOM_TRANLEN_MAX);
+
 	list_for_each_entry(t, &m->transfers, transfer_list) {
 		if (t->rx_buf)
 			rx_buf = t->rx_buf;
@@ -614,6 +602,13 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
 
 	mpc8xxx_spi = spi_master_get_devdata(master);
 
+	mpc8xxx_spi->local_buf =
+		devm_kmalloc(dev, SPCOM_TRANLEN_MAX, GFP_KERNEL);
+	if (!mpc8xxx_spi->local_buf) {
+		ret = -ENOMEM;
+		goto err_probe;
+	}
+
 	mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
 	if (IS_ERR(mpc8xxx_spi->reg_base)) {
 		ret = PTR_ERR(mpc8xxx_spi->reg_base);
diff --git a/drivers/spi/spi-fsl-lib.h b/drivers/spi/spi-fsl-lib.h
index 84f5dcb7a897..065b9db212cf 100644
--- a/drivers/spi/spi-fsl-lib.h
+++ b/drivers/spi/spi-fsl-lib.h
@@ -30,6 +30,7 @@ struct mpc8xxx_spi {
 	void *rx;
 #if IS_ENABLED(CONFIG_SPI_FSL_ESPI)
 	int len;
+	u8 *local_buf;
 #endif
 
 	int subblock;
-- 
2.8.1

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Re: [PATCH v3 10/15] spi: fsl-espi: improve the ISR frame

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 525 bytes --]

On Wed, Sep 07, 2016 at 10:53:23PM +0200, Heiner Kallweit wrote:
> Improve the ISR frame:

I *think* that by "frame" you mean "function" here but it's really hard
to tell.  Please try to use normal technical terms, it makes things much
easier to review.

> - move resetting the event bits to the ISR frame
> - change type of parameter irq to int
> - make sure that the event bits match at least one bit in the
>   interrupt mask register

This sounds like three separate changes and should therefore have been
three patches.

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