[v5 resend 0/6] i3c: master: some improvment for i3c master

[v5 resend 0/6] i3c: master: some improvment for i3c master

[Frank Li]

There are three major improvement

1. Add actual size in i3c_transfer because i3c allow target early termiate
transfer.
2. Add API for i3c_dev_gettstatus_format1 for i3c comand GET_STATUS.
3. svc master support hotjoin

Change log see each patches

Frank Li (6):
  i3c: master: add enable(disable) hot join in sys entry
  i3c: master: svc: add hot join support
  i3c: add actual_len in i3c_priv_xfer
  i3c: master: svc: rename read_len as actual_len
  i3c: master: svc: return actual transfer data len
  i3c: add API i3c_dev_gettstatus_format1() to get target device status

 drivers/i3c/device.c                |  24 ++++++
 drivers/i3c/internals.h             |   1 +
 drivers/i3c/master.c                | 109 ++++++++++++++++++++++++++++
 drivers/i3c/master/svc-i3c-master.c |  95 +++++++++++++++++++-----
 include/linux/i3c/device.h          |   3 +
 include/linux/i3c/master.h          |   5 ++
 6 files changed, 220 insertions(+), 17 deletions(-)

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[v5 resend 1/6] i3c: master: add enable(disable) hot join in sys entry

[Frank Li]

Add hotjoin entry in sys file system allow user enable/disable hotjoin
feature.

Add (*enable(disable)_hotjoin)() to i3c_master_controller_ops.
Add api i3c_master_enable(disable)_hotjoin();

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---

Notes:
    Change from v4 to v5
    - using kstrtobool()
    > +	if (!master ||
    > +	    !master->ops ||
    > +	    !master->ops->enable_hotjoin ||
    > +	    !master->ops->disable_hotjoin
    > +	   )
    
    break into two if, which will be more clear. and one line is 101 chars.
    
    Change from v3 to v4
    -none
    Change from v1 to v2.
    - Hotjoin control by sys entry, default enable hotjoin, which standard i3c
    feature, user can disable by echo 0 > /sys/bus/i3c/i3c-0/hotjoin

 drivers/i3c/master.c       | 83 ++++++++++++++++++++++++++++++++++++++
 include/linux/i3c/master.h |  5 +++
 2 files changed, 88 insertions(+)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 08aeb69a78003..d3b56c9f601e2 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -526,6 +526,88 @@ static ssize_t i2c_scl_frequency_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(i2c_scl_frequency);
 
+static int i3c_set_hotjoin(struct i3c_master_controller *master, bool enable)
+{
+	int ret;
+
+	if (!master || !master->ops)
+		return -EINVAL;
+
+	if (!master->ops->enable_hotjoin || !master->ops->disable_hotjoin)
+		return -EINVAL;
+
+	i3c_bus_normaluse_lock(&master->bus);
+
+	if (enable)
+		ret = master->ops->enable_hotjoin(master);
+	else
+		ret = master->ops->disable_hotjoin(master);
+
+	master->hotjoin = enable;
+
+	i3c_bus_normaluse_unlock(&master->bus);
+
+	return ret;
+}
+
+static ssize_t hotjoin_store(struct device *dev, struct device_attribute *attr,
+			     const char *buf, size_t count)
+{
+	struct i3c_bus *i3cbus = dev_to_i3cbus(dev);
+	int ret;
+	bool res;
+
+	if (!i3cbus->cur_master)
+		return -EINVAL;
+
+	if (kstrtobool(buf, &res))
+		return -EINVAL;
+
+	ret = i3c_set_hotjoin(i3cbus->cur_master->common.master, res);
+	if (ret)
+		return ret;
+
+	return count;
+}
+
+/*
+ * i3c_master_enable_hotjoin - Enable hotjoin
+ * @master: I3C master object
+ *
+ * Return: a 0 in case of success, an negative error code otherwise.
+ */
+int i3c_master_enable_hotjoin(struct i3c_master_controller *master)
+{
+	return i3c_set_hotjoin(master, true);
+}
+EXPORT_SYMBOL_GPL(i3c_master_enable_hotjoin);
+
+/*
+ * i3c_master_disable_hotjoin - Disable hotjoin
+ * @master: I3C master object
+ *
+ * Return: a 0 in case of success, an negative error code otherwise.
+ */
+int i3c_master_disable_hotjoin(struct i3c_master_controller *master)
+{
+	return i3c_set_hotjoin(master, false);
+}
+EXPORT_SYMBOL_GPL(i3c_master_disable_hotjoin);
+
+static ssize_t hotjoin_show(struct device *dev, struct device_attribute *da, char *buf)
+{
+	struct i3c_bus *i3cbus = dev_to_i3cbus(dev);
+	ssize_t ret;
+
+	i3c_bus_normaluse_lock(i3cbus);
+	ret = sysfs_emit(buf, "%d\n", i3cbus->cur_master->common.master->hotjoin);
+	i3c_bus_normaluse_unlock(i3cbus);
+
+	return ret;
+}
+
+static DEVICE_ATTR_RW(hotjoin);
+
 static struct attribute *i3c_masterdev_attrs[] = {
 	&dev_attr_mode.attr,
 	&dev_attr_current_master.attr,
@@ -536,6 +618,7 @@ static struct attribute *i3c_masterdev_attrs[] = {
 	&dev_attr_pid.attr,
 	&dev_attr_dynamic_address.attr,
 	&dev_attr_hdrcap.attr,
+	&dev_attr_hotjoin.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(i3c_masterdev);
diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h
index 0b52da4f23467..65b8965968af2 100644
--- a/include/linux/i3c/master.h
+++ b/include/linux/i3c/master.h
@@ -452,6 +452,8 @@ struct i3c_master_controller_ops {
 	int (*disable_ibi)(struct i3c_dev_desc *dev);
 	void (*recycle_ibi_slot)(struct i3c_dev_desc *dev,
 				 struct i3c_ibi_slot *slot);
+	int (*enable_hotjoin)(struct i3c_master_controller *master);
+	int (*disable_hotjoin)(struct i3c_master_controller *master);
 };
 
 /**
@@ -487,6 +489,7 @@ struct i3c_master_controller {
 	const struct i3c_master_controller_ops *ops;
 	unsigned int secondary : 1;
 	unsigned int init_done : 1;
+	unsigned int hotjoin: 1;
 	struct {
 		struct list_head i3c;
 		struct list_head i2c;
@@ -543,6 +546,8 @@ int i3c_master_register(struct i3c_master_controller *master,
 			const struct i3c_master_controller_ops *ops,
 			bool secondary);
 void i3c_master_unregister(struct i3c_master_controller *master);
+int i3c_master_enable_hotjoin(struct i3c_master_controller *master);
+int i3c_master_disable_hotjoin(struct i3c_master_controller *master);
 
 /**
  * i3c_dev_get_master_data() - get master private data attached to an I3C
-- 
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[v5 resend 2/6] i3c: master: svc: add hot join support

[Frank Li]

Add hot join support for svc master controller. Disable hot join defaultly.
User can use sys entry to enable hot join.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---

Notes:
    Change from v4 to v5
    - default disable hotjoin
    - add help func is_events_enabled()
    
    Change from v3 to v4
    -fix build warning
    
    All warnings (new ones prefixed by >>):
    
       drivers/i3c/master/svc-i3c-master.c:212: warning: Function parameter or member 'lock' not described in 'svc_i3c_master'
    >> drivers/i3c/master/svc-i3c-master.c:212: warning: Function parameter or member 'enabled_events' not described in 'svc_i3c_master'
       2 warnings as Errors

 drivers/i3c/master/svc-i3c-master.c | 61 +++++++++++++++++++++++++++--
 1 file changed, 57 insertions(+), 4 deletions(-)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index 6b6bdd163af4f..f2058a36f869b 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -128,6 +128,9 @@
 /* This parameter depends on the implementation and may be tuned */
 #define SVC_I3C_FIFO_SIZE 16
 
+#define SVC_I3C_EVENT_IBI	BIT(0)
+#define SVC_I3C_EVENT_HOTJOIN	BIT(1)
+
 struct svc_i3c_cmd {
 	u8 addr;
 	bool rnw;
@@ -176,6 +179,7 @@ struct svc_i3c_regs_save {
  * @ibi.tbq_slot: To be queued IBI slot
  * @ibi.lock: IBI lock
  * @lock: Transfer lock, protect between IBI work thread and callbacks from master
+ * @enabled_events: Bit masks for enable events (IBI, HotJoin).
  */
 struct svc_i3c_master {
 	struct i3c_master_controller base;
@@ -205,6 +209,7 @@ struct svc_i3c_master {
 		spinlock_t lock;
 	} ibi;
 	struct mutex lock;
+	int enabled_events;
 };
 
 /**
@@ -219,6 +224,11 @@ struct svc_i3c_i2c_dev_data {
 	struct i3c_generic_ibi_pool *ibi_pool;
 };
 
+static inline bool is_events_enabled(struct svc_i3c_master *master, u32 mask)
+{
+	return !!(master->enabled_events & mask);
+}
+
 static bool svc_i3c_master_error(struct svc_i3c_master *master)
 {
 	u32 mstatus, merrwarn;
@@ -428,13 +438,16 @@ static void svc_i3c_master_ibi_work(struct work_struct *work)
 	switch (ibitype) {
 	case SVC_I3C_MSTATUS_IBITYPE_IBI:
 		dev = svc_i3c_master_dev_from_addr(master, ibiaddr);
-		if (!dev)
+		if (!dev || !is_events_enabled(master, SVC_I3C_EVENT_IBI))
 			svc_i3c_master_nack_ibi(master);
 		else
 			svc_i3c_master_handle_ibi(master, dev);
 		break;
 	case SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN:
-		svc_i3c_master_ack_ibi(master, false);
+		if (is_events_enabled(master, SVC_I3C_EVENT_HOTJOIN))
+			svc_i3c_master_ack_ibi(master, false);
+		else
+			svc_i3c_master_nack_ibi(master);
 		break;
 	case SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST:
 		svc_i3c_master_nack_ibi(master);
@@ -471,7 +484,9 @@ static void svc_i3c_master_ibi_work(struct work_struct *work)
 		svc_i3c_master_emit_stop(master);
 		break;
 	case SVC_I3C_MSTATUS_IBITYPE_HOT_JOIN:
-		queue_work(master->base.wq, &master->hj_work);
+		svc_i3c_master_emit_stop(master);
+		if (is_events_enabled(master, SVC_I3C_EVENT_HOTJOIN))
+			queue_work(master->base.wq, &master->hj_work);
 		break;
 	case SVC_I3C_MSTATUS_IBITYPE_MASTER_REQUEST:
 	default:
@@ -1471,6 +1486,7 @@ static int svc_i3c_master_enable_ibi(struct i3c_dev_desc *dev)
 		return ret;
 	}
 
+	master->enabled_events |= SVC_I3C_EVENT_IBI;
 	svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART);
 
 	return i3c_master_enec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR);
@@ -1482,7 +1498,9 @@ static int svc_i3c_master_disable_ibi(struct i3c_dev_desc *dev)
 	struct svc_i3c_master *master = to_svc_i3c_master(m);
 	int ret;
 
-	svc_i3c_master_disable_interrupts(master);
+	master->enabled_events &= ~SVC_I3C_EVENT_IBI;
+	if (!master->enabled_events)
+		svc_i3c_master_disable_interrupts(master);
 
 	ret = i3c_master_disec_locked(m, dev->info.dyn_addr, I3C_CCC_EVENT_SIR);
 
@@ -1492,6 +1510,39 @@ static int svc_i3c_master_disable_ibi(struct i3c_dev_desc *dev)
 	return ret;
 }
 
+static int svc_i3c_master_enable_hotjoin(struct i3c_master_controller *m)
+{
+	struct svc_i3c_master *master = to_svc_i3c_master(m);
+	int ret;
+
+	ret = pm_runtime_resume_and_get(master->dev);
+	if (ret < 0) {
+		dev_err(master->dev, "<%s> Cannot get runtime PM.\n", __func__);
+		return ret;
+	}
+
+	master->enabled_events |= SVC_I3C_EVENT_HOTJOIN;
+
+	svc_i3c_master_enable_interrupts(master, SVC_I3C_MINT_SLVSTART);
+
+	return 0;
+}
+
+static int svc_i3c_master_disable_hotjoin(struct i3c_master_controller *m)
+{
+	struct svc_i3c_master *master = to_svc_i3c_master(m);
+
+	master->enabled_events &= ~SVC_I3C_EVENT_HOTJOIN;
+
+	if (!master->enabled_events)
+		svc_i3c_master_disable_interrupts(master);
+
+	pm_runtime_mark_last_busy(master->dev);
+	pm_runtime_put_autosuspend(master->dev);
+
+	return 0;
+}
+
 static void svc_i3c_master_recycle_ibi_slot(struct i3c_dev_desc *dev,
 					    struct i3c_ibi_slot *slot)
 {
@@ -1518,6 +1569,8 @@ static const struct i3c_master_controller_ops svc_i3c_master_ops = {
 	.recycle_ibi_slot = svc_i3c_master_recycle_ibi_slot,
 	.enable_ibi = svc_i3c_master_enable_ibi,
 	.disable_ibi = svc_i3c_master_disable_ibi,
+	.enable_hotjoin = svc_i3c_master_enable_hotjoin,
+	.disable_hotjoin = svc_i3c_master_disable_hotjoin,
 };
 
 static int svc_i3c_master_prepare_clks(struct svc_i3c_master *master)
-- 
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[v5 resend 3/6] i3c: add actual_len in i3c_priv_xfer

[Frank Li]

In MIPI I3C Specification:

"Ninth Bit of SDR Target Returned (Read) Data as End-of-Data: In I2C, the
ninth Data bit from Target to Controller is an ACK by the Controller. By
contrast, in I3C this bit allows the Target to end a Read, and allows the
Controller to Abort a Read. In SDR terms, the ninth bit of Read data is
referred to as the T-Bit (for ‘Transition’)"

I3C allow devices early terminate data transfer. So need "actual_len" field
to indicate how much get by i3c_priv_xfer.

Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---

Notes:
    change from v4 to v5
    - Add Miquel review tag

 include/linux/i3c/device.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h
index 90fa83464f003..ef6217da8253b 100644
--- a/include/linux/i3c/device.h
+++ b/include/linux/i3c/device.h
@@ -54,6 +54,7 @@ enum i3c_hdr_mode {
  * struct i3c_priv_xfer - I3C SDR private transfer
  * @rnw: encodes the transfer direction. true for a read, false for a write
  * @len: transfer length in bytes of the transfer
+ * @actual_len: actual length in bytes are transferred by the controller
  * @data: input/output buffer
  * @data.in: input buffer. Must point to a DMA-able buffer
  * @data.out: output buffer. Must point to a DMA-able buffer
@@ -62,6 +63,7 @@ enum i3c_hdr_mode {
 struct i3c_priv_xfer {
 	u8 rnw;
 	u16 len;
+	u16 actual_len;
 	union {
 		void *in;
 		const void *out;
-- 
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[v5 resend 4/6] i3c: master: svc: rename read_len as actual_len

[Frank Li]

I3C transfer (SDR), target can early terminate read transfer.
I3C transfer (HDR), target can end write transfer.
I2C transfer, target can NACK write transfer.

'actual_len' is better name than 'read_len'.

Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---

Notes:
    change from v4 to v5:
    use i3c: master: svc: prefix

 drivers/i3c/master/svc-i3c-master.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index f2058a36f869b..13a8b3c2aa541 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -137,7 +137,7 @@ struct svc_i3c_cmd {
 	u8 *in;
 	const void *out;
 	unsigned int len;
-	unsigned int read_len;
+	unsigned int actual_len;
 	bool continued;
 };
 
@@ -1038,7 +1038,7 @@ static int svc_i3c_master_write(struct svc_i3c_master *master,
 static int svc_i3c_master_xfer(struct svc_i3c_master *master,
 			       bool rnw, unsigned int xfer_type, u8 addr,
 			       u8 *in, const u8 *out, unsigned int xfer_len,
-			       unsigned int *read_len, bool continued)
+			       unsigned int *actual_len, bool continued)
 {
 	u32 reg;
 	int ret;
@@ -1051,7 +1051,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
 	       SVC_I3C_MCTRL_IBIRESP_NACK |
 	       SVC_I3C_MCTRL_DIR(rnw) |
 	       SVC_I3C_MCTRL_ADDR(addr) |
-	       SVC_I3C_MCTRL_RDTERM(*read_len),
+	       SVC_I3C_MCTRL_RDTERM(*actual_len),
 	       master->regs + SVC_I3C_MCTRL);
 
 	ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
@@ -1089,7 +1089,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
 		goto emit_stop;
 
 	if (rnw)
-		*read_len = ret;
+		*actual_len = ret;
 
 	ret = readl_poll_timeout(master->regs + SVC_I3C_MSTATUS, reg,
 				 SVC_I3C_MSTATUS_COMPLETE(reg), 0, 1000);
@@ -1171,7 +1171,7 @@ static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master)
 
 		ret = svc_i3c_master_xfer(master, cmd->rnw, xfer->type,
 					  cmd->addr, cmd->in, cmd->out,
-					  cmd->len, &cmd->read_len,
+					  cmd->len, &cmd->actual_len,
 					  cmd->continued);
 		if (ret)
 			break;
@@ -1257,7 +1257,7 @@ static int svc_i3c_master_send_bdcast_ccc_cmd(struct svc_i3c_master *master,
 	cmd->in = NULL;
 	cmd->out = buf;
 	cmd->len = xfer_len;
-	cmd->read_len = 0;
+	cmd->actual_len = 0;
 	cmd->continued = false;
 
 	mutex_lock(&master->lock);
@@ -1277,7 +1277,7 @@ static int svc_i3c_master_send_direct_ccc_cmd(struct svc_i3c_master *master,
 					      struct i3c_ccc_cmd *ccc)
 {
 	unsigned int xfer_len = ccc->dests[0].payload.len;
-	unsigned int read_len = ccc->rnw ? xfer_len : 0;
+	unsigned int actual_len = ccc->rnw ? xfer_len : 0;
 	struct svc_i3c_xfer *xfer;
 	struct svc_i3c_cmd *cmd;
 	int ret;
@@ -1295,7 +1295,7 @@ static int svc_i3c_master_send_direct_ccc_cmd(struct svc_i3c_master *master,
 	cmd->in = NULL;
 	cmd->out = &ccc->id;
 	cmd->len = 1;
-	cmd->read_len = 0;
+	cmd->actual_len = 0;
 	cmd->continued = true;
 
 	/* Directed message */
@@ -1305,7 +1305,7 @@ static int svc_i3c_master_send_direct_ccc_cmd(struct svc_i3c_master *master,
 	cmd->in = ccc->rnw ? ccc->dests[0].payload.data : NULL;
 	cmd->out = ccc->rnw ? NULL : ccc->dests[0].payload.data,
 	cmd->len = xfer_len;
-	cmd->read_len = read_len;
+	cmd->actual_len = actual_len;
 	cmd->continued = false;
 
 	mutex_lock(&master->lock);
@@ -1314,8 +1314,8 @@ static int svc_i3c_master_send_direct_ccc_cmd(struct svc_i3c_master *master,
 		svc_i3c_master_dequeue_xfer(master, xfer);
 	mutex_unlock(&master->lock);
 
-	if (cmd->read_len != xfer_len)
-		ccc->dests[0].payload.len = cmd->read_len;
+	if (cmd->actual_len != xfer_len)
+		ccc->dests[0].payload.len = cmd->actual_len;
 
 	ret = xfer->ret;
 	svc_i3c_master_free_xfer(xfer);
@@ -1365,7 +1365,7 @@ static int svc_i3c_master_priv_xfers(struct i3c_dev_desc *dev,
 		cmd->in = xfers[i].rnw ? xfers[i].data.in : NULL;
 		cmd->out = xfers[i].rnw ? NULL : xfers[i].data.out;
 		cmd->len = xfers[i].len;
-		cmd->read_len = xfers[i].rnw ? xfers[i].len : 0;
+		cmd->actual_len = xfers[i].rnw ? xfers[i].len : 0;
 		cmd->continued = (i + 1) < nxfers;
 	}
 
@@ -1405,7 +1405,7 @@ static int svc_i3c_master_i2c_xfers(struct i2c_dev_desc *dev,
 		cmd->in = cmd->rnw ? xfers[i].buf : NULL;
 		cmd->out = cmd->rnw ? NULL : xfers[i].buf;
 		cmd->len = xfers[i].len;
-		cmd->read_len = cmd->rnw ? xfers[i].len : 0;
+		cmd->actual_len = cmd->rnw ? xfers[i].len : 0;
 		cmd->continued = (i + 1 < nxfers);
 	}
 
-- 
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[v5 resend 5/6] i3c: master: svc: return actual transfer data len

[Frank Li]

I3C allow devices early terminate data transfer. So set "actual_len" to
indicate how much data get by i3c_priv_xfer.

Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---

Notes:
    change from v4 to v5
    update prefix
    add Miquel's review tag

 drivers/i3c/master/svc-i3c-master.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/i3c/master/svc-i3c-master.c b/drivers/i3c/master/svc-i3c-master.c
index 13a8b3c2aa541..bd10bb698da0f 100644
--- a/drivers/i3c/master/svc-i3c-master.c
+++ b/drivers/i3c/master/svc-i3c-master.c
@@ -138,6 +138,7 @@ struct svc_i3c_cmd {
 	const void *out;
 	unsigned int len;
 	unsigned int actual_len;
+	struct i3c_priv_xfer *xfer;
 	bool continued;
 };
 
@@ -1061,6 +1062,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
 
 	if (readl(master->regs + SVC_I3C_MERRWARN) & SVC_I3C_MERRWARN_NACK) {
 		ret = -ENXIO;
+		*actual_len = 0;
 		goto emit_stop;
 	}
 
@@ -1078,6 +1080,7 @@ static int svc_i3c_master_xfer(struct svc_i3c_master *master,
 	 */
 	if (SVC_I3C_MSTATUS_IBIWON(reg)) {
 		ret = -ENXIO;
+		*actual_len = 0;
 		goto emit_stop;
 	}
 
@@ -1173,6 +1176,10 @@ static void svc_i3c_master_start_xfer_locked(struct svc_i3c_master *master)
 					  cmd->addr, cmd->in, cmd->out,
 					  cmd->len, &cmd->actual_len,
 					  cmd->continued);
+		/* cmd->xfer is NULL if I2C or CCC transfer */
+		if (cmd->xfer)
+			cmd->xfer->actual_len = cmd->actual_len;
+
 		if (ret)
 			break;
 	}
@@ -1360,6 +1367,7 @@ static int svc_i3c_master_priv_xfers(struct i3c_dev_desc *dev,
 	for (i = 0; i < nxfers; i++) {
 		struct svc_i3c_cmd *cmd = &xfer->cmds[i];
 
+		cmd->xfer = &xfers[i];
 		cmd->addr = master->addrs[data->index];
 		cmd->rnw = xfers[i].rnw;
 		cmd->in = xfers[i].rnw ? xfers[i].data.in : NULL;
-- 
2.34.1


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[v5 resend 6/6] i3c: add API i3c_dev_gettstatus_format1() to get target device status

[Frank Li]

I3C standard 5.1.9.3.15 Get Device Status (GETSTATUS):
Get request for one I3C Target Device to return its current status.

Add API to fetch it with format1.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---

Notes:
    See below patch, which call i3c_dev_gettstatus_format1()
    https://lore.kernel.org/imx/202311070330.5mylauLR-lkp@intel.com/T/#t
    
    Change from v4 to v5
    - none

 drivers/i3c/device.c       | 24 ++++++++++++++++++++++++
 drivers/i3c/internals.h    |  1 +
 drivers/i3c/master.c       | 26 ++++++++++++++++++++++++++
 include/linux/i3c/device.h |  1 +
 4 files changed, 52 insertions(+)

diff --git a/drivers/i3c/device.c b/drivers/i3c/device.c
index 1a6a8703dbc3a..aa26cf50ab9c6 100644
--- a/drivers/i3c/device.c
+++ b/drivers/i3c/device.c
@@ -196,6 +196,30 @@ void i3c_device_free_ibi(struct i3c_device *dev)
 }
 EXPORT_SYMBOL_GPL(i3c_device_free_ibi);
 
+/**
+ * i3c_device_getstatus_format1() - Get device status with format 1.
+ * @dev: device for which you want to get status.
+ * @status: I3C status format 1
+ *
+ * Return: 0 in case of success, a negative error core otherwise.
+ */
+int i3c_device_getstatus_format1(struct i3c_device *dev, u16 *status)
+{
+	int ret = -EINVAL;
+
+	if (!status)
+		return -EINVAL;
+
+	i3c_bus_normaluse_lock(dev->bus);
+	if (dev->desc)
+		ret = i3c_dev_getstatus_format1_locked(dev->desc, status);
+
+	i3c_bus_normaluse_unlock(dev->bus);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(i3c_device_getstatus_format1);
+
 /**
  * i3cdev_to_dev() - Returns the device embedded in @i3cdev
  * @i3cdev: I3C device
diff --git a/drivers/i3c/internals.h b/drivers/i3c/internals.h
index 908a807badaf9..976ad26ca79c2 100644
--- a/drivers/i3c/internals.h
+++ b/drivers/i3c/internals.h
@@ -24,4 +24,5 @@ int i3c_dev_enable_ibi_locked(struct i3c_dev_desc *dev);
 int i3c_dev_request_ibi_locked(struct i3c_dev_desc *dev,
 			       const struct i3c_ibi_setup *req);
 void i3c_dev_free_ibi_locked(struct i3c_dev_desc *dev);
+int i3c_dev_getstatus_format1_locked(struct i3c_dev_desc *dev, u16 *status);
 #endif /* I3C_INTERNAL_H */
diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index d3b56c9f601e2..81611a3e3585a 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -2923,6 +2923,32 @@ void i3c_dev_free_ibi_locked(struct i3c_dev_desc *dev)
 	dev->ibi = NULL;
 }
 
+int i3c_dev_getstatus_format1_locked(struct i3c_dev_desc *dev, u16 *status)
+{
+	struct i3c_master_controller *master = i3c_dev_get_master(dev);
+	struct i3c_ccc_getstatus *format1;
+	struct i3c_ccc_cmd_dest dest;
+	struct i3c_ccc_cmd cmd;
+	int ret;
+
+	format1 = i3c_ccc_cmd_dest_init(&dest, dev->info.dyn_addr, sizeof(*format1));
+	if (!format1)
+		return -ENOMEM;
+
+	i3c_ccc_cmd_init(&cmd, true, I3C_CCC_GETSTATUS, &dest, 1);
+
+	ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
+	if (ret)
+		goto out;
+
+	*status = be16_to_cpu(format1->status);
+
+out:
+	i3c_ccc_cmd_dest_cleanup(&dest);
+
+	return ret;
+}
+
 static int __init i3c_init(void)
 {
 	int res;
diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h
index ef6217da8253b..5f511bd400f11 100644
--- a/include/linux/i3c/device.h
+++ b/include/linux/i3c/device.h
@@ -345,4 +345,5 @@ void i3c_device_free_ibi(struct i3c_device *dev);
 int i3c_device_enable_ibi(struct i3c_device *dev);
 int i3c_device_disable_ibi(struct i3c_device *dev);
 
+int i3c_device_getstatus_format1(struct i3c_device *dev, u16 *status);
 #endif /* I3C_DEV_H */
-- 
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Re: [v5 resend 0/6] i3c: master: some improvment for i3c master

[Frank Li]

On Fri, Dec 01, 2023 at 05:25:26PM -0500, Frank Li wrote:
> There are three major improvement
> 
> 1. Add actual size in i3c_transfer because i3c allow target early termiate
> transfer.
> 2. Add API for i3c_dev_gettstatus_format1 for i3c comand GET_STATUS.
> 3. svc master support hotjoin

Friendly ping. Any addtional comment about these patches?

Frank LI

> 
> Change log see each patches
> 
> Frank Li (6):
>   i3c: master: add enable(disable) hot join in sys entry
>   i3c: master: svc: add hot join support
>   i3c: add actual_len in i3c_priv_xfer
>   i3c: master: svc: rename read_len as actual_len
>   i3c: master: svc: return actual transfer data len
>   i3c: add API i3c_dev_gettstatus_format1() to get target device status
> 
>  drivers/i3c/device.c                |  24 ++++++
>  drivers/i3c/internals.h             |   1 +
>  drivers/i3c/master.c                | 109 ++++++++++++++++++++++++++++
>  drivers/i3c/master/svc-i3c-master.c |  95 +++++++++++++++++++-----
>  include/linux/i3c/device.h          |   3 +
>  include/linux/i3c/master.h          |   5 ++
>  6 files changed, 220 insertions(+), 17 deletions(-)
> 
> -- 
> 2.34.1
> 

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Re: [v5 resend 3/6] i3c: add actual_len in i3c_priv_xfer

[Joshua Yeong]

On 02/12/2023 6:25 AM, Frank Li wrote:
> In MIPI I3C Specification:
>
> "Ninth Bit of SDR Target Returned (Read) Data as End-of-Data: In I2C, the
> ninth Data bit from Target to Controller is an ACK by the Controller. By
> contrast, in I3C this bit allows the Target to end a Read, and allows the
> Controller to Abort a Read. In SDR terms, the ninth bit of Read data is
> referred to as the T-Bit (for ‘Transition’)"
>
> I3C allow devices early terminate data transfer. So need "actual_len" field
> to indicate how much get by i3c_priv_xfer.
>
> Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
> Signed-off-by: Frank Li <Frank.Li@nxp.com>
> ---
>
> Notes:
>      change from v4 to v5
>      - Add Miquel review tag
>
>   include/linux/i3c/device.h | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h
> index 90fa83464f003..ef6217da8253b 100644
> --- a/include/linux/i3c/device.h
> +++ b/include/linux/i3c/device.h
> @@ -54,6 +54,7 @@ enum i3c_hdr_mode {
>    * struct i3c_priv_xfer - I3C SDR private transfer
>    * @rnw: encodes the transfer direction. true for a read, false for a write
>    * @len: transfer length in bytes of the transfer
> + * @actual_len: actual length in bytes are transferred by the controller
>    * @data: input/output buffer
>    * @data.in: input buffer. Must point to a DMA-able buffer
>    * @data.out: output buffer. Must point to a DMA-able buffer
> @@ -62,6 +63,7 @@ enum i3c_hdr_mode {
>   struct i3c_priv_xfer {
>   	u8 rnw;
>   	u16 len;
What happens if I3C device does not terminate the T-Bit because it 
expects extra length from master?
> +	u16 actual_len;
>   	union {
>   		void *in;
>   		const void *out;

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Re: [v5 resend 3/6] i3c: add actual_len in i3c_priv_xfer

[Joshua Yeong]

On 02/12/2023 6:25 AM, Frank Li wrote:
> In MIPI I3C Specification:
>
> "Ninth Bit of SDR Target Returned (Read) Data as End-of-Data: In I2C, the
> ninth Data bit from Target to Controller is an ACK by the Controller. By
> contrast, in I3C this bit allows the Target to end a Read, and allows the
> Controller to Abort a Read. In SDR terms, the ninth bit of Read data is
> referred to as the T-Bit (for ‘Transition’)"
>
> I3C allow devices early terminate data transfer. So need "actual_len" field
> to indicate how much get by i3c_priv_xfer.
>
> Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
> Signed-off-by: Frank Li <Frank.Li@nxp.com>
> ---
>
> Notes:
>      change from v4 to v5
>      - Add Miquel review tag
>
>   include/linux/i3c/device.h | 2 ++
>   1 file changed, 2 insertions(+)
>
> diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h
> index 90fa83464f003..ef6217da8253b 100644
> --- a/include/linux/i3c/device.h
> +++ b/include/linux/i3c/device.h
> @@ -54,6 +54,7 @@ enum i3c_hdr_mode {
>    * struct i3c_priv_xfer - I3C SDR private transfer
>    * @rnw: encodes the transfer direction. true for a read, false for a write
>    * @len: transfer length in bytes of the transfer
> + * @actual_len: actual length in bytes are transferred by the controller
>    * @data: input/output buffer
>    * @data.in: input buffer. Must point to a DMA-able buffer
>    * @data.out: output buffer. Must point to a DMA-able buffer
> @@ -62,6 +63,7 @@ enum i3c_hdr_mode {
>   struct i3c_priv_xfer {
>   	u8 rnw;
>   	u16 len;
What happens if I3C device does not terminate the T-Bit because it 
expects extra length from master?
> +	u16 actual_len;
>   	union {
>   		void *in;
>   		const void *out;

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Re: [v5 resend 3/6] i3c: add actual_len in i3c_priv_xfer

[Frank Li]

On Wed, Dec 20, 2023 at 09:55:26AM +0800, Joshua Yeong wrote:
> 
> On 02/12/2023 6:25 AM, Frank Li wrote:
> > In MIPI I3C Specification:
> > 
> > "Ninth Bit of SDR Target Returned (Read) Data as End-of-Data: In I2C, the
> > ninth Data bit from Target to Controller is an ACK by the Controller. By
> > contrast, in I3C this bit allows the Target to end a Read, and allows the
> > Controller to Abort a Read. In SDR terms, the ninth bit of Read data is
> > referred to as the T-Bit (for ‘Transition’)"
> > 
> > I3C allow devices early terminate data transfer. So need "actual_len" field
> > to indicate how much get by i3c_priv_xfer.
> > 
> > Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
> > Signed-off-by: Frank Li <Frank.Li@nxp.com>
> > ---
> > 
> > Notes:
> >      change from v4 to v5
> >      - Add Miquel review tag
> > 
> >   include/linux/i3c/device.h | 2 ++
> >   1 file changed, 2 insertions(+)
> > 
> > diff --git a/include/linux/i3c/device.h b/include/linux/i3c/device.h
> > index 90fa83464f003..ef6217da8253b 100644
> > --- a/include/linux/i3c/device.h
> > +++ b/include/linux/i3c/device.h
> > @@ -54,6 +54,7 @@ enum i3c_hdr_mode {
> >    * struct i3c_priv_xfer - I3C SDR private transfer
> >    * @rnw: encodes the transfer direction. true for a read, false for a write
> >    * @len: transfer length in bytes of the transfer
> > + * @actual_len: actual length in bytes are transferred by the controller
> >    * @data: input/output buffer
> >    * @data.in: input buffer. Must point to a DMA-able buffer
> >    * @data.out: output buffer. Must point to a DMA-able buffer
> > @@ -62,6 +63,7 @@ enum i3c_hdr_mode {
> >   struct i3c_priv_xfer {
> >   	u8 rnw;
> >   	u16 len;
> What happens if I3C device does not terminate the T-Bit because it expects
> extra length from master?

If devices don't terminate T, there are two cases.

1. Master send STOP, then START new transfer. I3C Devices can decide start
new transfer, or continue transfer left data, which is totally up to how
I3C device and devices' driver implementation.

2. Master continue toggle SCL to get extra data. Just like a low frequency
at short period.

Frank

> > +	u16 actual_len;
> >   	union {
> >   		void *in;
> >   		const void *out;

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Re: (subset) [v5 resend 0/6] i3c: master: some improvment for i3c master

[Alexandre Belloni]

On Fri, 01 Dec 2023 17:25:26 -0500, Frank Li wrote:
> There are three major improvement
> 
> 1. Add actual size in i3c_transfer because i3c allow target early termiate
> transfer.
> 2. Add API for i3c_dev_gettstatus_format1 for i3c comand GET_STATUS.
> 3. svc master support hotjoin
> 
> [...]

Applied, thanks!

[1/6] i3c: master: add enable(disable) hot join in sys entry
      commit: 317bacf960a4879af22d12175f47d284930b3273
[2/6] i3c: master: svc: add hot join support
      commit: 05b26c31a4859af9e75b7de77458e99358364fe1
[3/6] i3c: add actual_len in i3c_priv_xfer
      commit: e5e3df06ac98d15cfb10bb5c12356709365e91b2
[4/6] i3c: master: svc: rename read_len as actual_len
      commit: 6fb61734a74eaa307a5b6a0bee770e736d8acf89
[5/6] i3c: master: svc: return actual transfer data len
      commit: 6d1a19d34e2cc07ca9cdad8892da94e716e9d15f

Best regards,

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Re: (subset) [v5 resend 0/6] i3c: master: some improvment for i3c master

[Frank Li]

On Mon, Jan 08, 2024 at 01:03:50AM +0100, Alexandre Belloni wrote:
> 
> On Fri, 01 Dec 2023 17:25:26 -0500, Frank Li wrote:
> > There are three major improvement
> > 
> > 1. Add actual size in i3c_transfer because i3c allow target early termiate
> > transfer.
> > 2. Add API for i3c_dev_gettstatus_format1 for i3c comand GET_STATUS.
> > 3. svc master support hotjoin
> > 
> > [...]
> 
> Applied, thanks!
> 
> [1/6] i3c: master: add enable(disable) hot join in sys entry
>       commit: 317bacf960a4879af22d12175f47d284930b3273
> [2/6] i3c: master: svc: add hot join support
>       commit: 05b26c31a4859af9e75b7de77458e99358364fe1
> [3/6] i3c: add actual_len in i3c_priv_xfer
>       commit: e5e3df06ac98d15cfb10bb5c12356709365e91b2
> [4/6] i3c: master: svc: rename read_len as actual_len
>       commit: 6fb61734a74eaa307a5b6a0bee770e736d8acf89
> [5/6] i3c: master: svc: return actual transfer data len
>       commit: 6d1a19d34e2cc07ca9cdad8892da94e716e9d15f

Why not pckup 6/6: 
 i3c: add API i3c_dev_gettstatus_format1() to get target device status

Frank

> 
> Best regards,
> 
> -- 
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> Embedded Linux and Kernel engineering
> https://bootlin.com

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Re: (subset) [v5 resend 0/6] i3c: master: some improvment for i3c master

[Alexandre Belloni]

On 08/01/2024 20:19:43-0500, Frank Li wrote:
> On Mon, Jan 08, 2024 at 01:03:50AM +0100, Alexandre Belloni wrote:
> > 
> > On Fri, 01 Dec 2023 17:25:26 -0500, Frank Li wrote:
> > > There are three major improvement
> > > 
> > > 1. Add actual size in i3c_transfer because i3c allow target early termiate
> > > transfer.
> > > 2. Add API for i3c_dev_gettstatus_format1 for i3c comand GET_STATUS.
> > > 3. svc master support hotjoin
> > > 
> > > [...]
> > 
> > Applied, thanks!
> > 
> > [1/6] i3c: master: add enable(disable) hot join in sys entry
> >       commit: 317bacf960a4879af22d12175f47d284930b3273
> > [2/6] i3c: master: svc: add hot join support
> >       commit: 05b26c31a4859af9e75b7de77458e99358364fe1
> > [3/6] i3c: add actual_len in i3c_priv_xfer
> >       commit: e5e3df06ac98d15cfb10bb5c12356709365e91b2
> > [4/6] i3c: master: svc: rename read_len as actual_len
> >       commit: 6fb61734a74eaa307a5b6a0bee770e736d8acf89
> > [5/6] i3c: master: svc: return actual transfer data len
> >       commit: 6d1a19d34e2cc07ca9cdad8892da94e716e9d15f
> 
> Why not pckup 6/6: 
>  i3c: add API i3c_dev_gettstatus_format1() to get target device status
> 

As it was discussed, it doesn't have any users.

> Frank
> 
> > 
> > Best regards,
> > 
> > -- 
> > Alexandre Belloni, co-owner and COO, Bootlin
> > Embedded Linux and Kernel engineering
> > https://bootlin.com

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