linux-kernel - RE: [PATCH] mmc: core: add a power cycle when CMD11 fails

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Date:   Thu, 25 Feb 2021 16:43:09 +0900
From:   "DooHyun Hwang" <dh0421.hwang@...sung.com>
To:     <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <ulf.hansson@...aro.org>, <ebiggers@...gle.com>,
        <wsa+renesas@...g-engineering.com>, <satyat@...gle.com>,
        <ludovic.barre@...com>, <linus.walleij@...aro.org>
Cc:     <grant.jung@...sung.com>, <jt77.jang@...sung.com>,
        <junwoo80.lee@...sung.com>, <jangsub.yi@...sung.com>,
        <sh043.lee@...sung.com>, <cw9316.lee@...sung.com>,
        <sh8267.baek@...sung.com>, <wkon.kim@...sung.com>
Subject: RE: [PATCH] mmc: core: add a power cycle when CMD11 fails

Dear Maintainers and commiters.

Please review this patch for updating.

Thanks and regards.
DooHyun Hwang.

On 17/02/10 4:59 am, DooHyun Hwang wrote:
>Subject: [PATCH] mmc: core: add a power cycle when CMD11 fails
>
>A power cycle is required if CMD11 fails.
>CMD11 failure should be handled as no response.
>
>If there is a timeout error that means no response to the CMD11, do not
>send the CMD11 again and the power cycle is required.
>Any other errors for CMD11 are the same because CMD11 failed.
>
>On some bad SD Card, CMD11 may fail but the card may have already invoked
>the voltage switch sequence.
>In this case, it is necessary to retry without voltage switching after
>power cycle.
>
>Signed-off-by: DooHyun Hwang <dh0421.hwang@...sung.com>