linux-kernel - Re: [PATCH 1/2] mmc: sdhci-esdhc-imx: move the setting of watermark level out of probe

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Date:	Thu, 19 Nov 2015 12:17:08 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Haibo Chen <haibo.chen@...escale.com>
Cc:	Dong Aisheng <aisheng.dong@...escale.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mmc: sdhci-esdhc-imx: move the setting of watermark
 level out of probe

On 10 November 2015 at 10:43, Haibo Chen <haibo.chen@...escale.com> wrote:
> Currently, we config the watermark_level register only in probe.
> This will cause the mmc write operation timeout issue after system
> resume back in LPSR mode. Because in LPSR mode, after system resume
> back, the watermark_level register(0x44) changes to 0x08000880, which
> set the write watermark level as 0, and set the read watermark level
> as 128. This value is incorrect.
>
> This patch move the setting of watermark level register out of probe,
> so after system resume back, mmc driver can set this watermark level
> register back to 0x10401040.

This seems all reasonable! But...

>
> Signed-off-by: Haibo Chen <haibo.chen@...escale.com>
> ---
>  drivers/mmc/host/sdhci-esdhc-imx.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
> index 1f1582f..1508949 100644
> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> @@ -584,6 +584,14 @@ static void esdhc_writeb_le(struct sdhci_host *host, u8 val, int reg)
>                 mask = 0xffff & ~(ESDHC_CTRL_BUSWIDTH_MASK | ESDHC_CTRL_D3CD);
>
>                 esdhc_clrset_le(host, mask, new_val, reg);
> +
> +               /*
> +                * The imx6q/imx7d ROM code will change the default watermark
> +                * level setting to something insane.  Change it back here.
> +                */
> +                if (esdhc_is_usdhc(imx_data))
> +                        writel(0x10401040, host->ioaddr + ESDHC_WTMK_LVL);
> +

... why don't keep setting the watermark in ->probe() and instead just
add it at as additional task to do at system PM resume?

>                 return;
>         }
>         esdhc_clrset_le(host, 0xff, val, reg);
> @@ -1155,13 +1163,7 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
>                 host->quirks |= SDHCI_QUIRK_NO_MULTIBLOCK
>                         | SDHCI_QUIRK_BROKEN_ADMA;
>
> -       /*
> -        * The imx6q ROM code will change the default watermark level setting
> -        * to something insane.  Change it back here.
> -        */
>         if (esdhc_is_usdhc(imx_data)) {
> -               writel(0x10401040, host->ioaddr + ESDHC_WTMK_LVL);
> -
>                 host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
>                 host->mmc->caps |= MMC_CAP_1_8V_DDR;
>
> --
> 1.9.1
>

Kind regards
Uffe
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