From: "DooHyun Hwang" <dh0421.hwang@samsung.com>
To: <linux-mmc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<ulf.hansson@linaro.org>, <ebiggers@google.com>,
<wsa+renesas@sang-engineering.com>, <satyat@google.com>,
<ludovic.barre@st.com>, <linus.walleij@linaro.org>
Cc: <grant.jung@samsung.com>, <jt77.jang@samsung.com>,
<junwoo80.lee@samsung.com>, <jangsub.yi@samsung.com>,
<sh043.lee@samsung.com>, <cw9316.lee@samsung.com>,
<sh8267.baek@samsung.com>, <wkon.kim@samsung.com>
Subject: RE: [PATCH] mmc: core: add a power cycle when CMD11 fails
Date: Thu, 25 Feb 2021 16:43:09 +0900 [thread overview]
Message-ID: <000001d70b49$dca136f0$95e3a4d0$@samsung.com> (raw)
In-Reply-To: <20210210045936.7809-1-dh0421.hwang@samsung.com>
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@samsung.com>
next prev parent reply other threads:[~2021-02-25 7:44 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20210210051209epcas1p3e55c0cbab7313731bc6e425da6189bb4@epcas1p3.samsung.com>
2021-02-10 4:59 ` [PATCH] mmc: core: add a power cycle when CMD11 fails DooHyun Hwang
2021-02-25 7:43 ` DooHyun Hwang [this message]
2021-03-02 10:38 ` Ulf Hansson
2021-03-03 6:30 ` DooHyun Hwang
2021-03-03 10:59 ` Ulf Hansson
2021-03-03 11:29 ` DooHyun Hwang
2021-03-03 6:39 ` DooHyun Hwang
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