linux-kernel - Re: [PATCH v3] mmc: sdhci: also get preset value and driver type for MMC

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Message-ID: <CAPDyKFpj+Mw5w43MD3wUssryn9y-Vyr6oNNQ+WVk2bLrbRUXjA@mail.gmail.com>
Date:	Tue, 25 Aug 2015 14:06:48 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Jisheng Zhang <jszhang@...vell.com>
Cc:	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3] mmc: sdhci: also get preset value and driver type for MMC_DDR52

On 18 August 2015 at 10:21, Jisheng Zhang <jszhang@...vell.com> wrote:
> commit bb8175a8aa42 ("mmc: sdhci: clarify DDR timing mode between
> SD-UHS and eMMC") added MMC_DDR52 as eMMC's DDR mode to be
> distinguished from SD-UHS, but it missed setting driver type for
> MMC_DDR52 timing mode.
>
> So sometimes we get the following error on Marvell BG2Q DMP board:
>
> [    1.559598] mmcblk0: error -84 transferring data, sector 0, nr 8, cmd
> response 0x900, card status 0xb00
> [    1.569314] mmcblk0: retrying using single block read
> [    1.575676] mmcblk0: error -84 transferring data, sector 2, nr 6, cmd
> response 0x900, card status 0x0
> [    1.585202] blk_update_request: I/O error, dev mmcblk0, sector 2
> [    1.591818] mmcblk0: error -84 transferring data, sector 3, nr 5, cmd
> response 0x900, card status 0x0
> [    1.601341] blk_update_request: I/O error, dev mmcblk0, sector 3
>
> This patches fixes this by adding the missing driver type setting.
>
> Fixes: bb8175a8aa42 ("mmc: sdhci: clarify DDR timing mode ...")
> Signed-off-by: Jisheng Zhang <jszhang@...vell.com>

Thanks, applied for next!

Kind regards
Uffe

> ---
>  Since v2:
>   - fix sdhci_get_preset_value for MMC_DDR52
>   - add typical emmc error log which this patch intends to fix
>
>  Since v1:
>   - correct commit-msg
>
>  drivers/mmc/host/sdhci.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 1dbe932..673d703 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -1132,6 +1132,7 @@ static u16 sdhci_get_preset_value(struct sdhci_host *host)
>                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_SDR104);
>                 break;
>         case MMC_TIMING_UHS_DDR50:
> +       case MMC_TIMING_MMC_DDR52:
>                 preset = sdhci_readw(host, SDHCI_PRESET_FOR_DDR50);
>                 break;
>         case MMC_TIMING_MMC_HS400:
> @@ -1559,7 +1560,8 @@ static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
>                                  (ios->timing == MMC_TIMING_UHS_SDR25) ||
>                                  (ios->timing == MMC_TIMING_UHS_SDR50) ||
>                                  (ios->timing == MMC_TIMING_UHS_SDR104) ||
> -                                (ios->timing == MMC_TIMING_UHS_DDR50))) {
> +                                (ios->timing == MMC_TIMING_UHS_DDR50) ||
> +                                (ios->timing == MMC_TIMING_MMC_DDR52))) {
>                         u16 preset;
>
>                         sdhci_enable_preset_value(host, true);
> --
> 2.5.0
>
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