linux-kernel - Re: [PATCH v3 1/3] mmc:sdhci: Add a quirk for AMD SDHC transfer mode register need to be cleared for cmd without data

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Date:	Wed, 5 Nov 2014 11:57:51 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Vincent Wan <vincent.wan@....com>
Cc:	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arindam Nath <arindam.nath@....com>,
	Huang Rui <ray.huang@....com>,
	Wan Zongshun <mcuos.com@...il.com>
Subject: Re: [PATCH v3 1/3] mmc:sdhci: Add a quirk for AMD SDHC transfer mode
 register need to be cleared for cmd without data

On 5 November 2014 07:09, Vincent Wan <vincent.wan@....com> wrote:
> SDHC controller in AMD chipsets require SDHC transfer mode
> register to be cleared for commands without data. The issue was
> uncovered during testing eMMC cards on KB/ML based platforms
>
> Signed-off-by: Vincent Wan <vincent.wan@....com>
> Signed-off-by: Wan Zongshun <mcuos.com@...il.com>
> Signed-off-by: Arindam Nath <arindam.nath@....com>
> Tested-by: Vikram B <vikram.b@....com>
> Tested-by: Raghavendra Swamy <raghavendra.swamy@....com>

Thanks! Applied for next.

Kind regards
Uffe

> ---
>  drivers/mmc/host/sdhci.c  | 9 +++++++--
>  include/linux/mmc/sdhci.h | 2 ++
>  2 files changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index f895ab0..a743d52 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -915,10 +915,15 @@ static void sdhci_set_transfer_mode(struct sdhci_host *host,
>         struct mmc_data *data = cmd->data;
>
>         if (data == NULL) {
> +               if (host->quirks2 &
> +                       SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD) {
> +                       sdhci_writew(host, 0x0, SDHCI_TRANSFER_MODE);
> +               } else {
>                 /* clear Auto CMD settings for no data CMDs */
> -               mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
> -               sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
> +                       mode = sdhci_readw(host, SDHCI_TRANSFER_MODE);
> +                       sdhci_writew(host, mode & ~(SDHCI_TRNS_AUTO_CMD12 |
>                                 SDHCI_TRNS_AUTO_CMD23), SDHCI_TRANSFER_MODE);
> +               }
>                 return;
>         }
>
> diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
> index 931ac5e..ae7f357 100644
> --- a/include/linux/mmc/sdhci.h
> +++ b/include/linux/mmc/sdhci.h
> @@ -102,6 +102,8 @@ struct sdhci_host {
>  #define SDHCI_QUIRK2_STOP_WITH_TC                      (1<<8)
>  /* Controller does not support 64-bit DMA */
>  #define SDHCI_QUIRK2_BROKEN_64_BIT_DMA                 (1<<9)
> +/* need clear transfer mode register before send cmd */
> +#define SDHCI_QUIRK2_CLEAR_TRANSFERMODE_REG_BEFORE_CMD (1<<10)
>
>         int irq;                /* Device IRQ */
>         void __iomem *ioaddr;   /* Mapped address */
> --
> 1.8.1.2
>
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