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

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Date: Fri, 12 Apr 2024 17:14:55 -0500
From: Judith Mendez <jm@...com>
To: "Kumar, Udit" <u-kumar1@...com>, Rob Herring <robh@...nel.org>,
        Krzysztof
 Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>,
        Tero
 Kristo <kristo@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Bhavya Kapoor <b-kapoor@...com>,
        Dasnavis
 Sabiya <sabiya.d@...com>
Subject: Re: [PATCH 7/7] arm64: dts: ti: k3-j784s4-evm: Remove HS400 mode
 support for eMMC

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@...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@...com>
>> Cc: Bhavya Kapoor <b-kapoor@...com>
>> Cc: Siddharth Vadapalli <s-vadapalli@...com>
>> Signed-off-by: Udit Kumar <u-kumar1@...com>
>> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
>> [Judith: Reword commit]
>> Signed-off-by: Judith Mendez <jm@...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 {