Re: [PATCH] ARM: dts: imx: Set default tuning step for imx7d usdhc0

[wangxiaolei <xiaolei.wang@windriver.com>]

On 7/22/23 8:16 AM, Fabio Estevam wrote:
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> Hi Xiaolei,
>
> On Fri, Jul 21, 2023 at 8:21 PM Xiaolei Wang <xiaolei.wang@windriver.com> wrote:
>> If the tuning step is not set, the tuning step is set to 1.
>> For some sd cards, the following Tuning timeout will occur,
>> so set the default tuning step.
>>
>> Tuning failed, falling back to fixed sampling clock
>> mmc0: Tuning failed, falling back to fixed sampling clock
>>
>> Fixes: 1e336aa0c025 ("mmc: sdhci-esdhc-imx: correct the tuning start tap and step setting")
>> Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
>> ---
>>   arch/arm/boot/dts/nxp/imx/imx7d-sdb.dts | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm/boot/dts/nxp/imx/imx7d-sdb.dts b/arch/arm/boot/dts/nxp/imx/imx7d-sdb.dts
>> index 75f1cd14bea1..d7396fbfcaf8 100644
>> --- a/arch/arm/boot/dts/nxp/imx/imx7d-sdb.dts
>> +++ b/arch/arm/boot/dts/nxp/imx/imx7d-sdb.dts
>> @@ -493,6 +493,7 @@ &usdhc1 {
>>          vmmc-supply = <&reg_sd1_vmmc>;
>>          wakeup-source;
>>          keep-power-in-suspend;
>> +       fsl,tuning-step = <2>;
> I wondering if this should be a imx7s.dtsi property instead.
>
> NXP vendor kernel passes:
>
> fsl,tuning-step = <2>;
> fsl,tuning-start-tap = <20>;
>
> https://github.com/nxp-imx/linux-imx/blob/lf-6.1.y/arch/arm/boot/dts/imx7s.dtsi#L1216-L1217
>
> Bough? Any suggestions?

Oh, I didn't notice this patch on linux-imx, I refer to the settings in 
https://github.com/nxp-imx/uboot-imx.git,

but it should be the same, I think it is better to bring this patch in

thanks

xiaolei

>
> Thanks