[PATCH 4.19.113 0/3] Fix for long operation cmds busy detection

[PATCH 4.19.113 0/3] Fix for long operation cmds busy detection

[Sowjanya Komatineni]

This series includes manually backported changes that implements Tegra
specific timeout callback to switch between finite and infinite HW busy
detection wait modes.

sdhci-tegra driver patch implements set_timeout callback based on one of
the sdhci host driver patch that refactors sdhci_set_timeout and allows
drivers to call __sdhci_set_timeout with their timeout callback
implementation.

Both of these patches are manually backported in this series.


Sowjanya Komatineni (3):
  mmc: sdhci: Refactor sdhci_set_timeout()
  sdhci: tegra: Implement Tegra specific set_timeout callback
  sdhci: tegra: Enable MMC_CAP_WAIT_WHILE_BUSY host capability

 drivers/mmc/host/sdhci-tegra.c | 32 ++++++++++++++++++++++++++++++++
 drivers/mmc/host/sdhci.c       | 38 ++++++++++++++++++++------------------
 drivers/mmc/host/sdhci.h       |  1 +
 3 files changed, 53 insertions(+), 18 deletions(-)

-- 
2.7.4

[PATCH 4.19.113 1/3] mmc: sdhci: Refactor sdhci_set_timeout()

[Sowjanya Komatineni]

commit 7d76ed77cfbd ("mmc: sdhci: Refactor sdhci_set_timeout()")

Refactor sdhci_set_timeout() such that platform drivers can do some
functionality in a set_timeout() callback and then call
__sdhci_set_timeout() to complete the operation.

Cc: <stable@vger.kernel.org>
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/mmc/host/sdhci.c | 38 ++++++++++++++++++++------------------
 drivers/mmc/host/sdhci.h |  1 +
 2 files changed, 21 insertions(+), 18 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 5a7fd89..c941e81 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -860,27 +860,29 @@ static void sdhci_set_data_timeout_irq(struct sdhci_host *host, bool enable)
 	sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
 }
 
-static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
+void __sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
 {
-	u8 count;
-
-	if (host->ops->set_timeout) {
-		host->ops->set_timeout(host, cmd);
-	} else {
-		bool too_big = false;
-
-		count = sdhci_calc_timeout(host, cmd, &too_big);
+	bool too_big = false;
+	u8 count = sdhci_calc_timeout(host, cmd, &too_big);
+
+	if (too_big &&
+	    host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT) {
+		sdhci_calc_sw_timeout(host, cmd);
+		sdhci_set_data_timeout_irq(host, false);
+	} else if (!(host->ier & SDHCI_INT_DATA_TIMEOUT)) {
+		sdhci_set_data_timeout_irq(host, true);
+	}
 
-		if (too_big &&
-		    host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT) {
-			sdhci_calc_sw_timeout(host, cmd);
-			sdhci_set_data_timeout_irq(host, false);
-		} else if (!(host->ier & SDHCI_INT_DATA_TIMEOUT)) {
-			sdhci_set_data_timeout_irq(host, true);
-		}
+	sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
+}
+EXPORT_SYMBOL_GPL(__sdhci_set_timeout);
 
-		sdhci_writeb(host, count, SDHCI_TIMEOUT_CONTROL);
-	}
+static void sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
+{
+	if (host->ops->set_timeout)
+		host->ops->set_timeout(host, cmd);
+	else
+		__sdhci_set_timeout(host, cmd);
 }
 
 static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index c0372e3..15ef9c6 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -759,5 +759,6 @@ void sdhci_start_tuning(struct sdhci_host *host);
 void sdhci_end_tuning(struct sdhci_host *host);
 void sdhci_reset_tuning(struct sdhci_host *host);
 void sdhci_send_tuning(struct sdhci_host *host, u32 opcode);
+void __sdhci_set_timeout(struct sdhci_host *host, struct mmc_command *cmd);
 
 #endif /* __SDHCI_HW_H */
-- 
2.7.4

[PATCH 4.19.113 2/3] sdhci: tegra: Implement Tegra specific set_timeout callback

[Sowjanya Komatineni]

commit 5e958e4aacf4
("sdhci: tegra: Implement Tegra specific set_timeout callback")

Tegra host supports HW busy detection and timeouts based on the
count programmed in SDHCI_TIMEOUT_CONTROL register and max busy
timeout it supports is 11s in finite busy wait mode.

Some operations like SLEEP_AWAKE, ERASE and flush cache through
SWITCH commands take longer than 11s and Tegra host supports
infinite HW busy wait mode where HW waits forever till the card
is busy without HW timeout.

This patch implements Tegra specific set_timeout sdhci_ops to allow
switching between finite and infinite HW busy detection wait modes
based on the device command expected operation time.

Cc: <stable@vger.kernel.org>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/mmc/host/sdhci-tegra.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 27bdf6d..0f4de73 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -39,6 +39,7 @@
 #define SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE	BIT(2)
 
 #define SDHCI_TEGRA_VENDOR_MISC_CTRL		0x120
+#define SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT	BIT(0)
 #define SDHCI_MISC_CTRL_ENABLE_SDR104		0x8
 #define SDHCI_MISC_CTRL_ENABLE_SDR50		0x10
 #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300	0x20
@@ -301,6 +302,34 @@ static int tegra_sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
 	return mmc_send_tuning(host->mmc, opcode, NULL);
 }
 
+static void tegra_sdhci_set_timeout(struct sdhci_host *host,
+				    struct mmc_command *cmd)
+{
+	u32 val;
+
+	/*
+	 * HW busy detection timeout is based on programmed data timeout
+	 * counter and maximum supported timeout is 11s which may not be
+	 * enough for long operations like cache flush, sleep awake, erase.
+	 *
+	 * ERASE_TIMEOUT_LIMIT bit of VENDOR_MISC_CTRL register allows
+	 * host controller to wait for busy state until the card is busy
+	 * without HW timeout.
+	 *
+	 * So, use infinite busy wait mode for operations that may take
+	 * more than maximum HW busy timeout of 11s otherwise use finite
+	 * busy wait mode.
+	 */
+	val = sdhci_readl(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
+	if (cmd && cmd->busy_timeout >= 11 * HZ)
+		val |= SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT;
+	else
+		val &= ~SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT;
+	sdhci_writel(host, val, SDHCI_TEGRA_VENDOR_MISC_CTRL);
+
+	__sdhci_set_timeout(host, cmd);
+}
+
 static void tegra_sdhci_voltage_switch(struct sdhci_host *host)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -379,6 +408,7 @@ static const struct sdhci_ops tegra114_sdhci_ops = {
 	.set_uhs_signaling = tegra_sdhci_set_uhs_signaling,
 	.voltage_switch = tegra_sdhci_voltage_switch,
 	.get_max_clock = tegra_sdhci_get_max_clock,
+	.set_timeout = tegra_sdhci_set_timeout,
 };
 
 static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
-- 
2.7.4

[PATCH 4.19.113 3/3] sdhci: tegra: Enable MMC_CAP_WAIT_WHILE_BUSY host capability

[Sowjanya Komatineni]

commit ff124c31ccd7
("sdhci: tegra: Enable MMC_CAP_WAIT_WHILE_BUSY host capability")

Tegra sdhci host supports HW busy detection of the device busy
signaling over data0 lane.

So, this patch enables host capability MMC_CAP_WAIT_WHILE_BUSY.

Cc: <stable@vger.kernel.org>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/mmc/host/sdhci-tegra.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 0f4de73..fde1f3b 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -529,6 +529,8 @@ static int sdhci_tegra_probe(struct platform_device *pdev)
 	if (rc)
 		goto err_parse_dt;
 
+	host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
+
 	if (tegra_host->soc_data->nvquirks & NVQUIRK_ENABLE_DDR50)
 		host->mmc->caps |= MMC_CAP_1_8V_DDR;
 
-- 
2.7.4

[PATCH 4.19.113 2/3] sdhci: tegra: Implement Tegra specific set_timeout callback

[Sowjanya Komatineni]

commit 5e958e4aacf4
("sdhci: tegra: Implement Tegra specific set_timeout callback")

Tegra host supports HW busy detection and timeouts based on the
count programmed in SDHCI_TIMEOUT_CONTROL register and max busy
timeout it supports is 11s in finite busy wait mode.

Some operations like SLEEP_AWAKE, ERASE and flush cache through
SWITCH commands take longer than 11s and Tegra host supports
infinite HW busy wait mode where HW waits forever till the card
is busy without HW timeout.

This patch implements Tegra specific set_timeout sdhci_ops to allow
switching between finite and infinite HW busy detection wait modes
based on the device command expected operation time.

Cc: <stable@vger.kernel.org>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/mmc/host/sdhci-tegra.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 27bdf6d..0f4de73 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -39,6 +39,7 @@
 #define SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE	BIT(2)
 
 #define SDHCI_TEGRA_VENDOR_MISC_CTRL		0x120
+#define SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT	BIT(0)
 #define SDHCI_MISC_CTRL_ENABLE_SDR104		0x8
 #define SDHCI_MISC_CTRL_ENABLE_SDR50		0x10
 #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300	0x20
@@ -301,6 +302,34 @@ static int tegra_sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
 	return mmc_send_tuning(host->mmc, opcode, NULL);
 }
 
+static void tegra_sdhci_set_timeout(struct sdhci_host *host,
+				    struct mmc_command *cmd)
+{
+	u32 val;
+
+	/*
+	 * HW busy detection timeout is based on programmed data timeout
+	 * counter and maximum supported timeout is 11s which may not be
+	 * enough for long operations like cache flush, sleep awake, erase.
+	 *
+	 * ERASE_TIMEOUT_LIMIT bit of VENDOR_MISC_CTRL register allows
+	 * host controller to wait for busy state until the card is busy
+	 * without HW timeout.
+	 *
+	 * So, use infinite busy wait mode for operations that may take
+	 * more than maximum HW busy timeout of 11s otherwise use finite
+	 * busy wait mode.
+	 */
+	val = sdhci_readl(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
+	if (cmd && cmd->busy_timeout >= 11 * HZ)
+		val |= SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT;
+	else
+		val &= ~SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT;
+	sdhci_writel(host, val, SDHCI_TEGRA_VENDOR_MISC_CTRL);
+
+	__sdhci_set_timeout(host, cmd);
+}
+
 static void tegra_sdhci_voltage_switch(struct sdhci_host *host)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@@ -379,6 +408,7 @@ static const struct sdhci_ops tegra114_sdhci_ops = {
 	.set_uhs_signaling = tegra_sdhci_set_uhs_signaling,
 	.voltage_switch = tegra_sdhci_voltage_switch,
 	.get_max_clock = tegra_sdhci_get_max_clock,
+	.set_timeout = tegra_sdhci_set_timeout,
 };
 
 static const struct sdhci_pltfm_data sdhci_tegra114_pdata = {
-- 
2.7.4