linux-kernel - Re: [PATCH 2/2] mmc: sdhci-esdhc-imx: correct the tuning-step setting

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Date:	Fri, 20 Nov 2015 00:34:13 +0800
From:	Dong Aisheng <dongas86@...il.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	Haibo Chen <haibo.chen@...escale.com>,
	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 2/2] mmc: sdhci-esdhc-imx: correct the tuning-step setting

Hi Ulf,

On Thu, Nov 19, 2015 at 7:20 PM, Ulf Hansson <ulf.hansson@...aro.org> wrote:
> On 10 November 2015 at 10:43, Haibo Chen <haibo.chen@...escale.com> wrote:
>> Here we use '|=' to set the tuning-step, but before that, we should
>> clear the tuning-step, otherwise we could got the wrong setting.
>>
>> Signed-off-by: Haibo Chen <haibo.chen@...escale.com>
>> ---
>>  drivers/mmc/host/sdhci-esdhc-imx.c | 7 +++++--
>>  1 file changed, 5 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
>> index 1508949..64275c7 100644
>> --- a/drivers/mmc/host/sdhci-esdhc-imx.c
>> +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
>> @@ -76,6 +76,7 @@
>>  #define ESDHC_STD_TUNING_EN            (1 << 24)
>>  /* NOTE: the minimum valid tuning start tap for mx6sl is 1 */
>>  #define ESDHC_TUNING_START_TAP         0x1
>> +#define ESDHC_TUNING_STEP_MASK         0x00070000
>>  #define ESDHC_TUNING_STEP_SHIFT                16
>>
>>  /* pinctrl state */
>> @@ -489,9 +490,11 @@ static void esdhc_writew_le(struct sdhci_host *host, u16 val, int reg)
>>                                 m |= ESDHC_MIX_CTRL_FBCLK_SEL;
>>                                 tuning_ctrl = readl(host->ioaddr + ESDHC_TUNING_CTRL);
>>                                 tuning_ctrl |= ESDHC_STD_TUNING_EN | ESDHC_TUNING_START_TAP;
>> -                               if (imx_data->boarddata.tuning_step)
>> +                               if (imx_data->boarddata.tuning_step) {
>> +                                       tuning_ctrl &= ~ESDHC_TUNING_STEP_MASK;
>>                                         tuning_ctrl |= imx_data->boarddata.tuning_step << ESDHC_TUNING_STEP_SHIFT;
>> -                                       writel(tuning_ctrl, host->ioaddr + ESDHC_TUNING_CTRL);
>> +                               }
>> +                               writel(tuning_ctrl, host->ioaddr + ESDHC_TUNING_CTRL);
>>                         } else {
>>                                 v &= ~ESDHC_MIX_CTRL_EXE_TUNE;
>>                         }
>> --
>> 1.9.1
>>
>
> Looks good to me, but is there a dependency to patch 1/2 that should
> prevent me from applying this one?
>

No dependency.
Acked-by: Dong Aisheng <aisheng.dong@...escale.com>

Regards
Dong Aisheng

> Kind regards
> Uffe
> --
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