[PATCH 7/7] arm64: dts: ti: k3-j784s4-evm: Remove HS400 mode support for eMMC

[Judith Mendez]

Hi Udit,

On 4/11/24 11:52 PM, Kumar, Udit wrote:
> Hi Judith
> 
> On 4/12/2024 4:22 AM, Judith Mendez wrote:
>> From: Udit Kumar <u-kumar1 at ti.com>
>>
>> The eMMC fails to enumerate intermittently on HS400 mode. Also
>> observing multiple CQE recovery warnings.
>>
>> Update the sdhci0 node to disable HS400.
>>
>> Cc: Vignesh Raghavendra <vigneshr at ti.com>
>> Cc: Bhavya Kapoor <b-kapoor at ti.com>
>> Cc: Siddharth Vadapalli <s-vadapalli at ti.com>
>> Signed-off-by: Udit Kumar <u-kumar1 at ti.com>
>> Signed-off-by: Vignesh Raghavendra <vigneshr at ti.com>
>> [Judith: Reword commit]
>> Signed-off-by: Judith Mendez <jm at ti.com>
>> ---
>>   arch/arm64/boot/dts/ti/k3-j784s4-evm.dts | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts 
>> b/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
>> index 81fd7afac8c57..04a241a91e6b8 100644
>> --- a/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
>> +++ b/arch/arm64/boot/dts/ti/k3-j784s4-evm.dts
>> @@ -791,6 +791,7 @@ &main_sdhci0 {
>>       non-removable;
>>       ti,driver-strength-ohm = <50>;
>>       disable-wp;
>> +    no-mmc-hs400;
> 
> This is just WA to get rid of CQE errors. I prefer to hold this patch 
> under debug from hardware side is not complete.
> 
> Moreover, CQE errors are seen with 32GB variant not with 16GB, So we can 
> not blame controller for this

Will drop, thanks.

~ Judith

> 
> 
>>   };
>>   &main_sdhci1 {