linux-kernel - Re: [PATCH 6/7] arm64: dts: ti: k3-am69-sk: Remove HS400 mode support for eMMC

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Date: Fri, 12 Apr 2024 17:14:19 -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 6/7] arm64: dts: ti: k3-am69-sk: Remove HS400 mode support
 for eMMC

Hi,

On 4/11/24 11:53 PM, Kumar, Udit wrote:
> Hi Judith
> 
> On 4/12/2024 4:22 AM, Judith Mendez wrote:
>> From: Dasnavis Sabiya <sabiya.d@...com>
>>
>> The eMMC fails to enumerate intermittently on HS400 mode. Also
>> observing multiple CQE recovery warnings.
>> Update the sdhci0 node to disable HS400 and set HS200 mode for
>> eMMC node.
>>
>> Signed-off-by: Dasnavis Sabiya <sabiya.d@...com>
>> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
>> ---
>>   arch/arm64/boot/dts/ti/k3-am69-sk.dts | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-am69-sk.dts 
>> b/arch/arm64/boot/dts/ti/k3-am69-sk.dts
>> index 50de2a448a3a6..a677bb9200a35 100644
>> --- a/arch/arm64/boot/dts/ti/k3-am69-sk.dts
>> +++ b/arch/arm64/boot/dts/ti/k3-am69-sk.dts
>> @@ -906,6 +906,7 @@ &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.

ok, will drop this patch.

~ Judith

> 
>>   };
>>   &main_sdhci1 {