[PATCH v6 0/8] mmc: sdhci-esdhc-imx: fix SDIO suspend/resume issues

[PATCH v6 0/8] mmc: sdhci-esdhc-imx: fix SDIO suspend/resume issues

[ziniu.wang_1]

From: Luke Wang <ziniu.wang_1@nxp.com>

This series fixes several suspend/resume issues in the sdhci-esdhc-imx
driver, primarily affecting SDIO devices (e.g., WiFi).

Issues fixed:
- Tuning delay values not saved/restored for out-of-band wakeup devices
- DLL override lost after resume for DDR modes
- Pinctrl not restored before DDR_EN is set, causing CRC errors
- Unhandled interrupt during resume causing "nobody cared" warning
- Various error handling issues in suspend/resume paths

All patches now carry a Fixes tag pointing at v6.16. Patches 2-8 fix
regressions introduced by commit 676a83855614 ("mmc: host:
sdhci-esdhc-imx: refactor the system PM logic") in v6.16; patch 1 fixes
commit c63d25cdc59a ("mmc: sdhci-esdhc-imx: Save tuning value when card
stays powered in suspend"), also in v6.16.

Changes since v5:
- Added Fixes tags to all remaining patches (patch 3, 6, 7, 8) so the
  whole series is properly tagged for stable, as requested by Ulf.
  No functional changes.

Changes since v4:
- New patch 3: Fix esdhc_change_pinstate() to move IS_ERR checks for
  pins_100mhz/pins_200mhz into their respective switch cases, so that
  legacy timing modes can still reach pinctrl_select_default_state().
  This avoids log spam on resume for devices without UHS pin states (Sashiko)

Changes since v3:
- Patch 2: Remove unused 'boarddata' variable in esdhc_set_uhs_signaling()
- Patch 7: Expand commit message to document intentional skip of enable_irq()
  and sdhci_disable_irq_wakeups() on early return, and explain why the
  PM runtime usage counter leak is acceptable (Sashiko)

Changes since v2:
- Patch 3: Updated commit message to explain the SoC IP integration
  detail about internal loopback path change when switching pinctrl
  from GPIO to USDHC function (per Bough Chen suggestion)
- Patch 5 (v2): Split into three separate patches (5/6/7) so each
  patch fixes one problem (per Frank Li suggestion)

Changes since v1:
- Added patch 5 to fix error handling issues identified during review
- Use pm_runtime_resume_and_get() instead of pm_runtime_get_sync()
- Make pinctrl and cd-wake failures non-fatal (dev_warn only)
- Use esdhc_change_pinstate() instead of pinctrl_pm_select_default_state()
  in resume to restore correct pin state based on timing mode
- Skip pinctrl restore for wakeup devices to avoid SD bus glitch
- Check pm_runtime_force_resume() return value in resume

Luke Wang (8):
  mmc: sdhci-esdhc-imx: remove unnecessary mmc_card_wake_sdio_irq check
    for tuning save/restore
  mmc: sdhci-esdhc-imx: restore DLL override for DDR modes on resume
  mmc: sdhci-esdhc-imx: fix esdhc_change_pinstate() to allow default
    state restore
  mmc: sdhci-esdhc-imx: restore pinctrl before restoring ios timing on
    resume
  mmc: sdhci-esdhc-imx: disable irq during suspend to fix unhandled
    interrupt
  mmc: sdhci-esdhc-imx: use pm_runtime_resume_and_get() in suspend
  mmc: sdhci-esdhc-imx: make non-fatal errors non-blocking in suspend
  mmc: sdhci-esdhc-imx: fix resume error handling

 drivers/mmc/host/sdhci-esdhc-imx.c | 84 ++++++++++++++++++++----------
 1 file changed, 56 insertions(+), 28 deletions(-)

-- 
2.34.1

[PATCH v6 1/8] mmc: sdhci-esdhc-imx: remove unnecessary mmc_card_wake_sdio_irq check for tuning save/restore

[ziniu.wang_1]

From: Luke Wang <ziniu.wang_1@nxp.com>

The tuning save/restore during system PM is conditioned on
mmc_card_wake_sdio_irq(), but this check is unrelated to whether
tuning values need to be preserved. The actual requirement is that
the card keeps power during suspend and the controller is a uSDHC.

SDIO devices using out-of-band GPIO wakeup maintain power during
suspend but do not set the SDIO IRQ wake flag. In this case the
tuning delay values are not saved/restored.

Remove the unnecessary mmc_card_wake_sdio_irq() condition from both
the suspend save and resume restore paths.

Fixes: c63d25cdc59a ("mmc: sdhci-esdhc-imx: Save tuning value when card stays powered in suspend")
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Haibo Chen <haibo.chen@nxp.com>
Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 18ecddd6df6f..6526d65538de 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -2064,8 +2064,7 @@ static int sdhci_esdhc_suspend(struct device *dev)
 	 * to save the tuning delay value just in case the usdhc
 	 * lost power during system PM.
 	 */
-	if (mmc_card_keep_power(host->mmc) && mmc_card_wake_sdio_irq(host->mmc) &&
-	    esdhc_is_usdhc(imx_data))
+	if (mmc_card_keep_power(host->mmc) && esdhc_is_usdhc(imx_data))
 		sdhc_esdhc_tuning_save(host);
 
 	if (device_may_wakeup(dev)) {
@@ -2124,8 +2123,7 @@ static int sdhci_esdhc_resume(struct device *dev)
 	 * restore the saved tuning delay value for the device which keep
 	 * power during system PM.
 	 */
-	if (mmc_card_keep_power(host->mmc) && mmc_card_wake_sdio_irq(host->mmc) &&
-	    esdhc_is_usdhc(imx_data))
+	if (mmc_card_keep_power(host->mmc) && esdhc_is_usdhc(imx_data))
 		sdhc_esdhc_tuning_restore(host);
 
 	pm_runtime_put_autosuspend(dev);
-- 
2.34.1

[PATCH v6 2/8] mmc: sdhci-esdhc-imx: restore DLL override for DDR modes on resume

[ziniu.wang_1]

From: Luke Wang <ziniu.wang_1@nxp.com>

sdhci_esdhc_imx_hwinit() unconditionally clears ESDHC_DLL_CTRL by
writing zero. For SDIO devices that keep power during system suspend
and operate in DDR mode, the card remains in DDR timing while the host
DLL override configuration is lost.

Extract the DLL override setup from esdhc_set_uhs_signaling() into
a helper esdhc_set_dll_override(), and call it on the resume path
when the card kept power and is using a DDR timing mode.

Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM logic")
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Haibo Chen <haibo.chen@nxp.com>
Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 39 +++++++++++++++++++++---------
 1 file changed, 28 insertions(+), 11 deletions(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 6526d65538de..7230d70e02ae 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -1349,6 +1349,23 @@ static int esdhc_change_pinstate(struct sdhci_host *host,
 	return pinctrl_select_state(imx_data->pinctrl, pinctrl);
 }
 
+static void esdhc_set_dll_override(struct sdhci_host *host)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
+	struct esdhc_platform_data *boarddata = &imx_data->boarddata;
+	u32 v;
+
+	if (!boarddata->delay_line)
+		return;
+
+	v = boarddata->delay_line << ESDHC_DLL_OVERRIDE_VAL_SHIFT |
+	    (1 << ESDHC_DLL_OVERRIDE_EN_SHIFT);
+	if (is_imx53_esdhc(imx_data))
+		v <<= 1;
+	writel(v, host->ioaddr + ESDHC_DLL_CTRL);
+}
+
 /*
  * For HS400 eMMC, there is a data_strobe line. This signal is generated
  * by the device and used for data output and CRC status response output
@@ -1404,7 +1421,6 @@ static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
 	u32 m;
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
-	struct esdhc_platform_data *boarddata = &imx_data->boarddata;
 
 	/* disable ddr mode and disable HS400 mode */
 	m = readl(host->ioaddr + ESDHC_MIX_CTRL);
@@ -1425,15 +1441,7 @@ static void esdhc_set_uhs_signaling(struct sdhci_host *host, unsigned timing)
 		m |= ESDHC_MIX_CTRL_DDREN;
 		writel(m, host->ioaddr + ESDHC_MIX_CTRL);
 		imx_data->is_ddr = 1;
-		if (boarddata->delay_line) {
-			u32 v;
-			v = boarddata->delay_line <<
-				ESDHC_DLL_OVERRIDE_VAL_SHIFT |
-				(1 << ESDHC_DLL_OVERRIDE_EN_SHIFT);
-			if (is_imx53_esdhc(imx_data))
-				v <<= 1;
-			writel(v, host->ioaddr + ESDHC_DLL_CTRL);
-		}
+		esdhc_set_dll_override(host);
 		break;
 	case MMC_TIMING_MMC_HS400:
 		m |= ESDHC_MIX_CTRL_DDREN | ESDHC_MIX_CTRL_HS400_EN;
@@ -2123,9 +2131,18 @@ static int sdhci_esdhc_resume(struct device *dev)
 	 * restore the saved tuning delay value for the device which keep
 	 * power during system PM.
 	 */
-	if (mmc_card_keep_power(host->mmc) && esdhc_is_usdhc(imx_data))
+	if (mmc_card_keep_power(host->mmc) && esdhc_is_usdhc(imx_data)) {
 		sdhc_esdhc_tuning_restore(host);
 
+		/*
+		 * Restore DLL override for DDR modes. hwinit unconditionally
+		 * clears ESDHC_DLL_CTRL, but the card is still in DDR mode.
+		 */
+		if (host->timing == MMC_TIMING_UHS_DDR50 ||
+		    host->timing == MMC_TIMING_MMC_DDR52)
+			esdhc_set_dll_override(host);
+	}
+
 	pm_runtime_put_autosuspend(dev);
 
 	return ret;
-- 
2.34.1

[PATCH v6 3/8] mmc: sdhci-esdhc-imx: fix esdhc_change_pinstate() to allow default state restore

[ziniu.wang_1]

From: Luke Wang <ziniu.wang_1@nxp.com>

esdhc_change_pinstate() checks for pins_100mhz and pins_200mhz at the
top of the function and returns -EINVAL if either is not defined. This
prevents the default case from ever being reached, which means devices
with a sleep pinctrl state but without high-speed pin states (100mhz/
200mhz) can never restore their default pin configuration.

Move the IS_ERR checks for pins_100mhz and pins_200mhz into their
respective switch cases.

Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM logic")
Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 7230d70e02ae..ead4685d621a 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -1326,19 +1326,21 @@ static int esdhc_change_pinstate(struct sdhci_host *host,
 
 	dev_dbg(mmc_dev(host->mmc), "change pinctrl state for uhs %d\n", uhs);
 
-	if (IS_ERR(imx_data->pinctrl) ||
-		IS_ERR(imx_data->pins_100mhz) ||
-		IS_ERR(imx_data->pins_200mhz))
+	if (IS_ERR(imx_data->pinctrl))
 		return -EINVAL;
 
 	switch (uhs) {
 	case MMC_TIMING_UHS_SDR50:
 	case MMC_TIMING_UHS_DDR50:
+		if (IS_ERR(imx_data->pins_100mhz))
+			return -EINVAL;
 		pinctrl = imx_data->pins_100mhz;
 		break;
 	case MMC_TIMING_UHS_SDR104:
 	case MMC_TIMING_MMC_HS200:
 	case MMC_TIMING_MMC_HS400:
+		if (IS_ERR(imx_data->pins_200mhz))
+			return -EINVAL;
 		pinctrl = imx_data->pins_200mhz;
 		break;
 	default:
-- 
2.34.1

Re: [PATCH v6 3/8] mmc: sdhci-esdhc-imx: fix esdhc_change_pinstate() to allow default state restore

[Frank Li]

On Mon, Jul 13, 2026 at 12:38:59PM +0800, ziniu.wang_1@oss.nxp.com wrote:
> From: Luke Wang <ziniu.wang_1@nxp.com>
>
> esdhc_change_pinstate() checks for pins_100mhz and pins_200mhz at the
> top of the function and returns -EINVAL if either is not defined. This
> prevents the default case from ever being reached, which means devices
> with a sleep pinctrl state but without high-speed pin states (100mhz/
> 200mhz) can never restore their default pin configuration.
>
> Move the IS_ERR checks for pins_100mhz and pins_200mhz into their
> respective switch cases.
>
> Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM logic")
> Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>  drivers/mmc/host/sdhci-esdhc-imx.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 7230d70e02ae..ead4685d621a 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -1326,19 +1326,21 @@ static int esdhc_change_pinstate(struct sdhci_host *host,
>
>  	dev_dbg(mmc_dev(host->mmc), "change pinctrl state for uhs %d\n", uhs);
>
> -	if (IS_ERR(imx_data->pinctrl) ||
> -		IS_ERR(imx_data->pins_100mhz) ||
> -		IS_ERR(imx_data->pins_200mhz))
> +	if (IS_ERR(imx_data->pinctrl))
>  		return -EINVAL;
>
>  	switch (uhs) {
>  	case MMC_TIMING_UHS_SDR50:
>  	case MMC_TIMING_UHS_DDR50:
> +		if (IS_ERR(imx_data->pins_100mhz))
> +			return -EINVAL;
>  		pinctrl = imx_data->pins_100mhz;
>  		break;
>  	case MMC_TIMING_UHS_SDR104:
>  	case MMC_TIMING_MMC_HS200:
>  	case MMC_TIMING_MMC_HS400:
> +		if (IS_ERR(imx_data->pins_200mhz))
> +			return -EINVAL;
>  		pinctrl = imx_data->pins_200mhz;
>  		break;
>  	default:
> --
> 2.34.1
>
>

[PATCH v6 4/8] mmc: sdhci-esdhc-imx: restore pinctrl before restoring ios timing on resume

[ziniu.wang_1]

From: Luke Wang <ziniu.wang_1@nxp.com>

SDIO devices such as WiFi may keep power during suspend, so the MMC
core skips full card re-initialization on resume and directly restores
the host controller's ios timing to match the card. For DDR mode,
pm_runtime_force_resume() sets DDR_EN before the pin configuration is
restored from sleep state.

This is related to the SoC IP integration: switching pinctrl setting
(changing alt from GPIO to USDHC) impacts the internal loopback path.
If pinctrl configures the pad to GPIO function, once DDR_EN is set, the
DLL delay will be fixed based on the GPIO function loopback path. When
the pinctrl is later changed to USDHC function, the internal loopback
path changes, making the original fixed sample point no longer suitable
for the current loopback path. This causes persistent read CRC errors on
subsequent data transfers.

SD/eMMC running in DDR mode are unaffected as they are fully
re-initialized from legacy timing after resume.

Fix this by restoring the pinctrl state based on current timing mode
using esdhc_change_pinstate() before pm_runtime_force_resume(). This
ensures the correct pin configuration (e.g., 100/200MHz for UHS modes)
is applied before DDR_EN is set. Only restore for non-wakeup devices
since wakeup devices kept their active pin state during suspend.

Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM logic")
Reviewed-by: Haibo Chen <haibo.chen@nxp.com>
Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index ead4685d621a..a54da5757acc 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -2115,6 +2115,12 @@ static int sdhci_esdhc_resume(struct device *dev)
 	struct pltfm_imx_data *imx_data = sdhci_pltfm_priv(pltfm_host);
 	int ret;
 
+	if (!device_may_wakeup(dev)) {
+		ret = esdhc_change_pinstate(host, host->timing);
+		if (ret)
+			dev_warn(dev, "Failed to restore pinctrl state\n");
+	}
+
 	pm_runtime_force_resume(dev);
 
 	ret = mmc_gpio_set_cd_wake(host->mmc, false);
-- 
2.34.1

[PATCH v6 5/8] mmc: sdhci-esdhc-imx: disable irq during suspend to fix unhandled interrupt

[ziniu.wang_1]

From: Luke Wang <ziniu.wang_1@nxp.com>

When using WIFI out-of-band wakeup, an "irq xxx: nobody cared" warning
occurs. This happens because the usdhc interrupt is not disabled during
system suspend when device_may_wakeup() returns false.

The sequence of events leading to this issue:
1. System enters suspend without disabling usdhc interrupt
(because device_may_wakeup() returns false for usdhc device)
2. WIFI out-of-band wakeup triggers system resume via GPIO interrupt
3. WIFI sends a Card interrupt before usdhc has fully resumed
4. usdhc is still in runtime suspend state and cannot handle the
interrupt properly
5. The unhandled interrupt triggers "nobody cared" warning

Fix this by unconditionally disabling the usdhc interrupt during suspend
and re-enabling it during resume, regardless of the wakeup capability.
This ensures no interrupts are processed during the suspend/resume
transition.

Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM logic")
Reviewed-by: Haibo Chen <haibo.chen@nxp.com>
Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index a54da5757acc..d980dea9cad1 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -2077,9 +2077,10 @@ static int sdhci_esdhc_suspend(struct device *dev)
 	if (mmc_card_keep_power(host->mmc) && esdhc_is_usdhc(imx_data))
 		sdhc_esdhc_tuning_save(host);
 
+	/* The irqs of imx are not shared. It is safe to disable */
+	disable_irq(host->irq);
+
 	if (device_may_wakeup(dev)) {
-		/* The irqs of imx are not shared. It is safe to disable */
-		disable_irq(host->irq);
 		ret = sdhci_enable_irq_wakeups(host);
 		if (!ret)
 			dev_warn(dev, "Failed to enable irq wakeup\n");
@@ -2130,10 +2131,10 @@ static int sdhci_esdhc_resume(struct device *dev)
 	/* re-initialize hw state in case it's lost in low power mode */
 	sdhci_esdhc_imx_hwinit(host);
 
-	if (host->irq_wake_enabled) {
+	if (host->irq_wake_enabled)
 		sdhci_disable_irq_wakeups(host);
-		enable_irq(host->irq);
-	}
+
+	enable_irq(host->irq);
 
 	/*
 	 * restore the saved tuning delay value for the device which keep
-- 
2.34.1

[PATCH v6 6/8] mmc: sdhci-esdhc-imx: use pm_runtime_resume_and_get() in suspend

[ziniu.wang_1]

From: Luke Wang <ziniu.wang_1@nxp.com>

Replace pm_runtime_get_sync() with pm_runtime_resume_and_get() to
simplify error handling. pm_runtime_resume_and_get() automatically
drops the usage counter on failure, avoiding the need for a separate
pm_runtime_put_noidle() call. If it fails, the device is unclocked and
accessing hardware registers would cause a kernel panic, so return the
error immediately.

Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM logic")
Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index d980dea9cad1..7818f351a58a 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -2061,7 +2061,9 @@ static int sdhci_esdhc_suspend(struct device *dev)
 	 * 2, make sure the pm_runtime_force_resume() in sdhci_esdhc_resume() really
 	 *    invoke its ->runtime_resume callback (needs_force_resume = 1).
 	 */
-	pm_runtime_get_sync(dev);
+	ret = pm_runtime_resume_and_get(dev);
+	if (ret)
+		return ret;
 
 	if ((imx_data->socdata->flags & ESDHC_FLAG_STATE_LOST_IN_LPMODE) &&
 		(host->tuning_mode != SDHCI_TUNING_MODE_1)) {
-- 
2.34.1

[PATCH v6 7/8] mmc: sdhci-esdhc-imx: make non-fatal errors non-blocking in suspend

[ziniu.wang_1]

From: Luke Wang <ziniu.wang_1@nxp.com>

Make pinctrl_pm_select_sleep_state() and mmc_gpio_set_cd_wake() failures
non-fatal in the suspend path. These failures only mean slightly higher
power consumption or missing CD wakeup capability, but should not block
system suspend.

Also change the function to always return 0 on the success path instead
of propagating non-fatal warning return values.

Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM logic")
Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 7818f351a58a..6cb84690fde4 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -2097,10 +2097,12 @@ static int sdhci_esdhc_suspend(struct device *dev)
 		 */
 		ret = pinctrl_pm_select_sleep_state(dev);
 		if (ret)
-			return ret;
+			dev_warn(dev, "Failed to select sleep pinctrl state\n");
 	}
 
 	ret = mmc_gpio_set_cd_wake(host->mmc, true);
+	if (ret)
+		dev_warn(dev, "Failed to enable cd wake\n");
 
 	/*
 	 * Make sure invoke runtime_suspend to gate off clock.
@@ -2108,7 +2110,7 @@ static int sdhci_esdhc_suspend(struct device *dev)
 	 */
 	pm_runtime_force_suspend(dev);
 
-	return ret;
+	return 0;
 }
 
 static int sdhci_esdhc_resume(struct device *dev)
-- 
2.34.1

Re: [PATCH v6 7/8] mmc: sdhci-esdhc-imx: make non-fatal errors non-blocking in suspend

[Frank Li]

On Mon, Jul 13, 2026 at 12:39:03PM +0800, ziniu.wang_1@oss.nxp.com wrote:
> From: Luke Wang <ziniu.wang_1@nxp.com>
>
> Make pinctrl_pm_select_sleep_state() and mmc_gpio_set_cd_wake() failures
> non-fatal in the suspend path. These failures only mean slightly higher
> power consumption or missing CD wakeup capability, but should not block
> system suspend.
>
> Also change the function to always return 0 on the success path instead
> of propagating non-fatal warning return values.
>
> Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM logic")
> Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
> ---
>  drivers/mmc/host/sdhci-esdhc-imx.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 7818f351a58a..6cb84690fde4 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -2097,10 +2097,12 @@ static int sdhci_esdhc_suspend(struct device *dev)
>  		 */
>  		ret = pinctrl_pm_select_sleep_state(dev);
>  		if (ret)
> -			return ret;
> +			dev_warn(dev, "Failed to select sleep pinctrl state\n");
>  	}
>
>  	ret = mmc_gpio_set_cd_wake(host->mmc, true);
> +	if (ret)
> +		dev_warn(dev, "Failed to enable cd wake\n");
>
>  	/*
>  	 * Make sure invoke runtime_suspend to gate off clock.
> @@ -2108,7 +2110,7 @@ static int sdhci_esdhc_suspend(struct device *dev)
>  	 */
>  	pm_runtime_force_suspend(dev);
>
> -	return ret;
> +	return 0;

if other error path set ret as not zero, the real error may missed, I suggest
don't set it let

	if (pinctrl_pm_select_sleep_state(dev))
		dev_warn(...)

	still leave ret here.

Frank

>  }
>
>  static int sdhci_esdhc_resume(struct device *dev)
> --
> 2.34.1
>
>

RE: [PATCH v6 7/8] mmc: sdhci-esdhc-imx: make non-fatal errors non-blocking in suspend

[Luke Wang (OSS)]

> -----Original Message-----
> From: Frank Li (OSS) <frank.li@oss.nxp.com>
> Sent: Monday, July 13, 2026 10:53 PM
> To: Luke Wang (OSS) <ziniu.wang_1@oss.nxp.com>
> Cc: adrian.hunter@intel.com; ulfh@kernel.org; Bough Chen
> <haibo.chen@nxp.com>; Frank Li <frank.li@nxp.com>;
> s.hauer@pengutronix.de; kernel@pengutronix.de; festevam@gmail.com;
> imx@lists.linux.dev; linux-mmc@vger.kernel.org; dl-S32 <S32@nxp.com>;
> linux-arm-kernel@lists.infradead.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH v6 7/8] mmc: sdhci-esdhc-imx: make non-fatal errors non-
> blocking in suspend
> 
> On Mon, Jul 13, 2026 at 12:39:03PM +0800, ziniu.wang_1@oss.nxp.com wrote:
> > From: Luke Wang <ziniu.wang_1@nxp.com>
> >
> > Make pinctrl_pm_select_sleep_state() and mmc_gpio_set_cd_wake() failures
> > non-fatal in the suspend path. These failures only mean slightly higher
> > power consumption or missing CD wakeup capability, but should not block
> > system suspend.
> >
> > Also change the function to always return 0 on the success path instead
> > of propagating non-fatal warning return values.
> >
> > Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM
> logic")
> > Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
> > ---
> >  drivers/mmc/host/sdhci-esdhc-imx.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-
> esdhc-imx.c
> > index 7818f351a58a..6cb84690fde4 100644
> > --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> > +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> > @@ -2097,10 +2097,12 @@ static int sdhci_esdhc_suspend(struct device
> *dev)
> >  		 */
> >  		ret = pinctrl_pm_select_sleep_state(dev);
> >  		if (ret)
> > -			return ret;
> > +			dev_warn(dev, "Failed to select sleep pinctrl state\n");
> >  	}
> >
> >  	ret = mmc_gpio_set_cd_wake(host->mmc, true);
> > +	if (ret)
> > +		dev_warn(dev, "Failed to enable cd wake\n");
> >
> >  	/*
> >  	 * Make sure invoke runtime_suspend to gate off clock.
> > @@ -2108,7 +2110,7 @@ static int sdhci_esdhc_suspend(struct device *dev)
> >  	 */
> >  	pm_runtime_force_suspend(dev);
> >
> > -	return ret;
> > +	return 0;
> 
> if other error path set ret as not zero, the real error may missed, I suggest
> don't set it let
> 
> 	if (pinctrl_pm_select_sleep_state(dev))
> 		dev_warn(...)
> 
> 	still leave ret here.

Thanks for the review.

The fatal error path (pm_runtime_resume_and_get()) already returns
early, so by the time we reach the end of the function, ret can only
hold a non-fatal (warn-only) value. Keeping "return ret" would turn
these intentionally non-fatal errors back into fatal ones and block
system suspend, which is exactly what this patch tries to avoid.

To address your concern about ret being polluted, I'll drop the
assignment for the non-fatal calls so they no longer touch ret:

	if (!sdhci_enable_irq_wakeups(host))
		dev_warn(dev, "Failed to enable irq wakeup\n");

	if (pinctrl_pm_select_sleep_state(dev))
		dev_warn(dev, "Failed to select sleep pinctrl state\n");

	if (mmc_gpio_set_cd_wake(host->mmc, true))
		dev_warn(dev, "Failed to enable cd wake\n");

	pm_runtime_force_suspend(dev);
	return 0;

This keeps the semantics clear. Will send v7 patch.

Thanks, 
Luke

> 
> Frank
> 
> >  }
> >
> >  static int sdhci_esdhc_resume(struct device *dev)
> > --
> > 2.34.1
> >
> >

[PATCH v6 8/8] mmc: sdhci-esdhc-imx: fix resume error handling

[ziniu.wang_1]

From: Luke Wang <ziniu.wang_1@nxp.com>

Check pm_runtime_force_resume() return value in resume. If it fails
(clock enable failure), return immediately since accessing hardware
registers on an unclocked device would cause a kernel panic.

The early return intentionally skips enable_irq() and
sdhci_disable_irq_wakeups() because the IRQ handler reads
SDHCI_INT_STATUS, which would also fault without clocks. The PM runtime
usage counter leak only affects this already-broken device instance and
is an acceptable tradeoff to preserve system stability.

Remove the return value check for mmc_gpio_set_cd_wake(host->mmc, false)
since disable_irq_wake() called internally always returns 0.

Also return 0 explicitly on the success path instead of propagating
stale return values.

Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM logic")
Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
---
 drivers/mmc/host/sdhci-esdhc-imx.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 6cb84690fde4..f4bfb14423e4 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -2126,12 +2126,12 @@ static int sdhci_esdhc_resume(struct device *dev)
 			dev_warn(dev, "Failed to restore pinctrl state\n");
 	}
 
-	pm_runtime_force_resume(dev);
-
-	ret = mmc_gpio_set_cd_wake(host->mmc, false);
+	ret = pm_runtime_force_resume(dev);
 	if (ret)
 		return ret;
 
+	mmc_gpio_set_cd_wake(host->mmc, false);
+
 	/* re-initialize hw state in case it's lost in low power mode */
 	sdhci_esdhc_imx_hwinit(host);
 
@@ -2158,7 +2158,7 @@ static int sdhci_esdhc_resume(struct device *dev)
 
 	pm_runtime_put_autosuspend(dev);
 
-	return ret;
+	return 0;
 }
 
 static int sdhci_esdhc_runtime_suspend(struct device *dev)
-- 
2.34.1

Re: [PATCH v6 8/8] mmc: sdhci-esdhc-imx: fix resume error handling

[Frank Li]

On Mon, Jul 13, 2026 at 12:39:04PM +0800, ziniu.wang_1@oss.nxp.com wrote:
> From: Luke Wang <ziniu.wang_1@nxp.com>
>
> Check pm_runtime_force_resume() return value in resume. If it fails
> (clock enable failure), return immediately since accessing hardware
> registers on an unclocked device would cause a kernel panic.
>
> The early return intentionally skips enable_irq() and
> sdhci_disable_irq_wakeups() because the IRQ handler reads
> SDHCI_INT_STATUS, which would also fault without clocks. The PM runtime
> usage counter leak only affects this already-broken device instance and
> is an acceptable tradeoff to preserve system stability.
>
> Remove the return value check for mmc_gpio_set_cd_wake(host->mmc, false)
> since disable_irq_wake() called internally always returns 0.
>
> Also return 0 explicitly on the success path instead of propagating
> stale return values.
>
> Fixes: 676a83855614 ("mmc: host: sdhci-esdhc-imx: refactor the system PM logic")
> Signed-off-by: Luke Wang <ziniu.wang_1@nxp.com>
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>  drivers/mmc/host/sdhci-esdhc-imx.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 6cb84690fde4..f4bfb14423e4 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -2126,12 +2126,12 @@ static int sdhci_esdhc_resume(struct device *dev)
>  			dev_warn(dev, "Failed to restore pinctrl state\n");
>  	}
>
> -	pm_runtime_force_resume(dev);
> -
> -	ret = mmc_gpio_set_cd_wake(host->mmc, false);
> +	ret = pm_runtime_force_resume(dev);
>  	if (ret)
>  		return ret;
>
> +	mmc_gpio_set_cd_wake(host->mmc, false);
> +
>  	/* re-initialize hw state in case it's lost in low power mode */
>  	sdhci_esdhc_imx_hwinit(host);
>
> @@ -2158,7 +2158,7 @@ static int sdhci_esdhc_resume(struct device *dev)
>
>  	pm_runtime_put_autosuspend(dev);
>
> -	return ret;
> +	return 0;
>  }
>
>  static int sdhci_esdhc_runtime_suspend(struct device *dev)
> --
> 2.34.1
>
>

Re: [PATCH v6 0/8] mmc: sdhci-esdhc-imx: fix SDIO suspend/resume issues

[Adrian Hunter]

On 13/07/2026 07:38, ziniu.wang_1@oss.nxp.com wrote:
> From: Luke Wang <ziniu.wang_1@nxp.com>
> 
> This series fixes several suspend/resume issues in the sdhci-esdhc-imx
> driver, primarily affecting SDIO devices (e.g., WiFi).
> 
> Issues fixed:
> - Tuning delay values not saved/restored for out-of-band wakeup devices
> - DLL override lost after resume for DDR modes
> - Pinctrl not restored before DDR_EN is set, causing CRC errors
> - Unhandled interrupt during resume causing "nobody cared" warning
> - Various error handling issues in suspend/resume paths
> 
> All patches now carry a Fixes tag pointing at v6.16. Patches 2-8 fix
> regressions introduced by commit 676a83855614 ("mmc: host:
> sdhci-esdhc-imx: refactor the system PM logic") in v6.16; patch 1 fixes
> commit c63d25cdc59a ("mmc: sdhci-esdhc-imx: Save tuning value when card
> stays powered in suspend"), also in v6.16.
> 
> Changes since v5:
> - Added Fixes tags to all remaining patches (patch 3, 6, 7, 8) so the
>   whole series is properly tagged for stable, as requested by Ulf.
>   No functional changes.
> 
> Changes since v4:
> - New patch 3: Fix esdhc_change_pinstate() to move IS_ERR checks for
>   pins_100mhz/pins_200mhz into their respective switch cases, so that
>   legacy timing modes can still reach pinctrl_select_default_state().
>   This avoids log spam on resume for devices without UHS pin states (Sashiko)
> 
> Changes since v3:
> - Patch 2: Remove unused 'boarddata' variable in esdhc_set_uhs_signaling()
> - Patch 7: Expand commit message to document intentional skip of enable_irq()
>   and sdhci_disable_irq_wakeups() on early return, and explain why the
>   PM runtime usage counter leak is acceptable (Sashiko)
> 
> Changes since v2:
> - Patch 3: Updated commit message to explain the SoC IP integration
>   detail about internal loopback path change when switching pinctrl
>   from GPIO to USDHC function (per Bough Chen suggestion)
> - Patch 5 (v2): Split into three separate patches (5/6/7) so each
>   patch fixes one problem (per Frank Li suggestion)
> 
> Changes since v1:
> - Added patch 5 to fix error handling issues identified during review
> - Use pm_runtime_resume_and_get() instead of pm_runtime_get_sync()
> - Make pinctrl and cd-wake failures non-fatal (dev_warn only)
> - Use esdhc_change_pinstate() instead of pinctrl_pm_select_default_state()
>   in resume to restore correct pin state based on timing mode
> - Skip pinctrl restore for wakeup devices to avoid SD bus glitch
> - Check pm_runtime_force_resume() return value in resume
> 
> Luke Wang (8):
>   mmc: sdhci-esdhc-imx: remove unnecessary mmc_card_wake_sdio_irq check
>     for tuning save/restore
>   mmc: sdhci-esdhc-imx: restore DLL override for DDR modes on resume
>   mmc: sdhci-esdhc-imx: fix esdhc_change_pinstate() to allow default
>     state restore
>   mmc: sdhci-esdhc-imx: restore pinctrl before restoring ios timing on
>     resume
>   mmc: sdhci-esdhc-imx: disable irq during suspend to fix unhandled
>     interrupt
>   mmc: sdhci-esdhc-imx: use pm_runtime_resume_and_get() in suspend
>   mmc: sdhci-esdhc-imx: make non-fatal errors non-blocking in suspend
>   mmc: sdhci-esdhc-imx: fix resume error handling
> 
>  drivers/mmc/host/sdhci-esdhc-imx.c | 84 ++++++++++++++++++++----------
>  1 file changed, 56 insertions(+), 28 deletions(-)
> 

Already acked patches 1 and 2, but now for all the rest:

Acked-by: Adrian Hunter <adrian.hunter@intel.com>