On Thu, Nov 19, 2015 at 7:17 PM, Ulf Hansson <ulf.hansson@xxxxxxxxxx> wrote:
> On 10 November 2015 at 10:43, Haibo Chen <haibo.chen@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx>
>> ---
>> 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?
>
I guess the reason may be keep using common sdhci_pltfrm_suspend() function
instead of creating new one.
But i think it's a good suggestion that we can create a platform
specific suspend/resume
function and put pm stuff into there for better code organization.
Haibo, you may try Ulf's suggestion.
Regards
Dong Aisheng
>> 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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