linux-kernel - Re: [PATCH 3/4] mmc: mmci: stm32: clear DLYB

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Date:   Thu, 16 Dec 2021 10:48:54 +0100
From:   Yann Gautier <yann.gautier@...s.st.com>
To:     Marek Vasut <marex@...x.de>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>
CC:     Ulf Hansson <ulf.hansson@...aro.org>,
        Russell King <linux@...linux.org.uk>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vladimir Zapolskiy <vz@...ia.com>,
        <u.kleine-koenig@...gutronix.de>,
        Christophe Kerello <christophe.kerello@...s.st.com>,
        Ludovic Barre <ludovic.barre@...s.st.com>
Subject: Re: [PATCH 3/4] mmc: mmci: stm32: clear DLYB_CR after sending tuning
 command

On 12/16/21 10:13 AM, Marek Vasut wrote:
> On 12/15/21 15:17, Yann Gautier wrote:
>> During test campaign, and especially after several unbind/bind sequences,
>> it has been seen that the SD-card on SDMMC1 thread could freeze.
>> The freeze always appear on a CMD23 following a CMD19.
>> Checking SDMMC internal registers shows that the tuning command (CMD19)
>> has failed.
>> The freeze is then due to the delay block involved in the tuning 
>> sequence.
>> To correct this, clear the delay block register DLYB_CR register after
>> the tuning commands.
>>
>> Signed-off-by: Christophe Kerello <christophe.kerello@...s.st.com>
>> Signed-off-by: Yann Gautier <yann.gautier@...s.st.com>
>> ---
>>   drivers/mmc/host/mmci_stm32_sdmmc.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/mmc/host/mmci_stm32_sdmmc.c 
>> b/drivers/mmc/host/mmci_stm32_sdmmc.c
>> index fdaa11f92fe6..a75d3dd34d18 100644
>> --- a/drivers/mmc/host/mmci_stm32_sdmmc.c
>> +++ b/drivers/mmc/host/mmci_stm32_sdmmc.c
>> @@ -441,6 +441,8 @@ static int sdmmc_dlyb_phase_tuning(struct 
>> mmci_host *host, u32 opcode)
>>           return -EINVAL;
>>       }
>> +    writel_relaxed(0, dlyb->base + DLYB_CR);
>> +
>>       phase = end_of_len - max_len / 2;
>>       sdmmc_dlyb_set_cfgr(dlyb, dlyb->unit, phase, false);
> 
> Shouldn't this have a Fixes: tag and be CC stable ?
> This seems like a bugfix, no ?

Hi Marek,

You're right, I should have added:
Fixes: 1103f807a3b9 ("mmc: mmci_sdmmc: Add execute tuning with delay block")

Ulf, could you manage that, or should I push a new version?


Best regards,
Yann