mmc: sdhci-of-at91: fix cd-gpios for SAMA5D2
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Message ID 8d10950d9940468577daef4772b82a071b204716.1584290561.git.mirq-linux@rere.qmqm.pl
State Accepted
Commit 53dd0a7cd65edc83b0c243d1c08377c8b876b2ee
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Series
  • mmc: sdhci-of-at91: fix cd-gpios for SAMA5D2
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Commit Message

Michał Mirosław March 15, 2020, 4:44 p.m. UTC
SAMA5D2x doesn't drive CMD line if GPIO is used as CD line (at least
SAMA5D27 doesn't). Fix this by forcing card-detect in the module
if module-controlled CD is not used.

Fixed commit addresses the problem only for non-removable cards. This
amends it to also cover gpio-cd case.

Cc: stable@vger.kernel.org
Fixes: 7a1e3f143176 ("mmc: sdhci-of-at91: force card detect value for non removable devices")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/mmc/host/sdhci-of-at91.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Comments

Adrian Hunter March 17, 2020, 9:57 a.m. UTC | #1
On 15/03/20 6:44 pm, Michał Mirosław wrote:
> SAMA5D2x doesn't drive CMD line if GPIO is used as CD line (at least
> SAMA5D27 doesn't). Fix this by forcing card-detect in the module
> if module-controlled CD is not used.
> 
> Fixed commit addresses the problem only for non-removable cards. This
> amends it to also cover gpio-cd case.
> 
> Cc: stable@vger.kernel.org
> Fixes: 7a1e3f143176 ("mmc: sdhci-of-at91: force card detect value for non removable devices")
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>

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

> ---
>  drivers/mmc/host/sdhci-of-at91.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c
> index d90f4ed18283..8f8da2fe48a9 100644
> --- a/drivers/mmc/host/sdhci-of-at91.c
> +++ b/drivers/mmc/host/sdhci-of-at91.c
> @@ -185,7 +185,8 @@ static void sdhci_at91_reset(struct sdhci_host *host, u8 mask)
>  
>  	sdhci_reset(host, mask);
>  
> -	if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +	if ((host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +	    || mmc_gpio_get_cd(host->mmc) >= 0)
>  		sdhci_at91_set_force_card_detect(host);
>  
>  	if (priv->cal_always_on && (mask & SDHCI_RESET_ALL))
> @@ -487,8 +488,11 @@ static int sdhci_at91_probe(struct platform_device *pdev)
>  	 * detection procedure using the SDMCC_CD signal is bypassed.
>  	 * This bit is reset when a software reset for all command is performed
>  	 * so we need to implement our own reset function to set back this bit.
> +	 *
> +	 * WA: SAMA5D2 doesn't drive CMD if using CD GPIO line.
>  	 */
> -	if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +	if ((host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +	    || mmc_gpio_get_cd(host->mmc) >= 0)
>  		sdhci_at91_set_force_card_detect(host);
>  
>  	pm_runtime_put_autosuspend(&pdev->dev);
>
Ulf Hansson March 17, 2020, 11:58 a.m. UTC | #2
On Sun, 15 Mar 2020 at 17:44, Michał Mirosław <mirq-linux@rere.qmqm.pl> wrote:
>
> SAMA5D2x doesn't drive CMD line if GPIO is used as CD line (at least
> SAMA5D27 doesn't). Fix this by forcing card-detect in the module
> if module-controlled CD is not used.
>
> Fixed commit addresses the problem only for non-removable cards. This
> amends it to also cover gpio-cd case.
>
> Cc: stable@vger.kernel.org
> Fixes: 7a1e3f143176 ("mmc: sdhci-of-at91: force card detect value for non removable devices")
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>

Applied for fixes, thanks!

Kind regards
Uffe


> ---
>  drivers/mmc/host/sdhci-of-at91.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c
> index d90f4ed18283..8f8da2fe48a9 100644
> --- a/drivers/mmc/host/sdhci-of-at91.c
> +++ b/drivers/mmc/host/sdhci-of-at91.c
> @@ -185,7 +185,8 @@ static void sdhci_at91_reset(struct sdhci_host *host, u8 mask)
>
>         sdhci_reset(host, mask);
>
> -       if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +       if ((host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +           || mmc_gpio_get_cd(host->mmc) >= 0)
>                 sdhci_at91_set_force_card_detect(host);
>
>         if (priv->cal_always_on && (mask & SDHCI_RESET_ALL))
> @@ -487,8 +488,11 @@ static int sdhci_at91_probe(struct platform_device *pdev)
>          * detection procedure using the SDMCC_CD signal is bypassed.
>          * This bit is reset when a software reset for all command is performed
>          * so we need to implement our own reset function to set back this bit.
> +        *
> +        * WA: SAMA5D2 doesn't drive CMD if using CD GPIO line.
>          */
> -       if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +       if ((host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +           || mmc_gpio_get_cd(host->mmc) >= 0)
>                 sdhci_at91_set_force_card_detect(host);
>
>         pm_runtime_put_autosuspend(&pdev->dev);
> --
> 2.20.1
>
Ludovic Desroches March 23, 2020, 8:23 p.m. UTC | #3
Hi,


On 3/15/2020 5:44 PM, Michał Mirosław wrote
> SAMA5D2x doesn't drive CMD line if GPIO is used as CD line (at least
> SAMA5D27 doesn't). Fix this by forcing card-detect in the module
> if module-controlled CD is not used.
>
> Fixed commit addresses the problem only for non-removable cards. This
> amends it to also cover gpio-cd case.
>
> Cc: stable@vger.kernel.org
> Fixes: 7a1e3f143176 ("mmc: sdhci-of-at91: force card detect value for non removable devices")
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>

Even if it's too late, I agree with this patch. Thanks, I didn't expect 
someone will use a GPIO CD instead of the

one of the controller so this case was missing.

In fact, the whole SAMA5D2 family is concerned depending on the revision 
of the SoC. From the top of my head,

for rev A, if the pin is muxed to another function than the SDMMC 
controller, the default value is card present.

For rev B and later, the default value is no card present, that's why 
the CMD line is not driven.

Regards

Ludovic


> ---
>   drivers/mmc/host/sdhci-of-at91.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c
> index d90f4ed18283..8f8da2fe48a9 100644
> --- a/drivers/mmc/host/sdhci-of-at91.c
> +++ b/drivers/mmc/host/sdhci-of-at91.c
> @@ -185,7 +185,8 @@ static void sdhci_at91_reset(struct sdhci_host *host, u8 mask)
>
>          sdhci_reset(host, mask);
>
> -       if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +       if ((host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +           || mmc_gpio_get_cd(host->mmc) >= 0)
>                  sdhci_at91_set_force_card_detect(host);
>
>          if (priv->cal_always_on && (mask & SDHCI_RESET_ALL))
> @@ -487,8 +488,11 @@ static int sdhci_at91_probe(struct platform_device *pdev)
>           * detection procedure using the SDMCC_CD signal is bypassed.
>           * This bit is reset when a software reset for all command is performed
>           * so we need to implement our own reset function to set back this bit.
> +        *
> +        * WA: SAMA5D2 doesn't drive CMD if using CD GPIO line.
>           */
> -       if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +       if ((host->mmc->caps & MMC_CAP_NONREMOVABLE)
> +           || mmc_gpio_get_cd(host->mmc) >= 0)
>                  sdhci_at91_set_force_card_detect(host);
>
>          pm_runtime_put_autosuspend(&pdev->dev);
> --
> 2.20.1
>

Patch
diff mbox series

diff --git a/drivers/mmc/host/sdhci-of-at91.c b/drivers/mmc/host/sdhci-of-at91.c
index d90f4ed18283..8f8da2fe48a9 100644
--- a/drivers/mmc/host/sdhci-of-at91.c
+++ b/drivers/mmc/host/sdhci-of-at91.c
@@ -185,7 +185,8 @@  static void sdhci_at91_reset(struct sdhci_host *host, u8 mask)
 
 	sdhci_reset(host, mask);
 
-	if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
+	if ((host->mmc->caps & MMC_CAP_NONREMOVABLE)
+	    || mmc_gpio_get_cd(host->mmc) >= 0)
 		sdhci_at91_set_force_card_detect(host);
 
 	if (priv->cal_always_on && (mask & SDHCI_RESET_ALL))
@@ -487,8 +488,11 @@  static int sdhci_at91_probe(struct platform_device *pdev)
 	 * detection procedure using the SDMCC_CD signal is bypassed.
 	 * This bit is reset when a software reset for all command is performed
 	 * so we need to implement our own reset function to set back this bit.
+	 *
+	 * WA: SAMA5D2 doesn't drive CMD if using CD GPIO line.
 	 */
-	if (host->mmc->caps & MMC_CAP_NONREMOVABLE)
+	if ((host->mmc->caps & MMC_CAP_NONREMOVABLE)
+	    || mmc_gpio_get_cd(host->mmc) >= 0)
 		sdhci_at91_set_force_card_detect(host);
 
 	pm_runtime_put_autosuspend(&pdev->dev);