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Date:   Mon, 6 Nov 2023 08:35:24 +0200
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Subject: Re: [PATCH V2 3/6] mmc: block: Be sure to wait while busy in CQE
 error recovery
To:     Avri Altman <Avri.Altman@wdc.com>,
        Ulf Hansson <ulf.hansson@linaro.org>,
        =?UTF-8?Q?Kornel_Dul=C4=99ba?= <korneld@chromium.org>,
        Radoslaw Biernacki <biernacki@google.com>,
        Gwendal Grignou <gwendal@chromium.org>,
        Asutosh Das <quic_asutoshd@quicinc.com>
Cc:     Chaotian Jing <chaotian.jing@mediatek.com>,
        Bhavya Kapoor <b-kapoor@ti.com>,
        Kamal Dasu <kamal.dasu@broadcom.com>,
        Al Cooper <alcooperx@gmail.com>,
        Haibo Chen <haibo.chen@nxp.com>,
        Shaik Sajida Bhanu <quic_c_sbhanu@quicinc.com>,
        Sai Krishna Potthuri <sai.krishna.potthuri@amd.com>,
        Victor Shih <victor.shih@genesyslogic.com.tw>,
        Ben Chuang <ben.chuang@genesyslogic.com.tw>,
        Thierry Reding <thierry.reding@gmail.com>,
        Aniruddha Tvs Rao <anrao@nvidia.com>,
        Chun-Hung Wu <chun-hung.wu@mediatek.com>,
        "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <20231103084720.6886-1-adrian.hunter@intel.com>
 <20231103084720.6886-4-adrian.hunter@intel.com>
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From:   Adrian Hunter <adrian.hunter@intel.com>
Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki,
 Business Identity Code: 0357606 - 4, Domiciled in Helsinki
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On 3/11/23 12:48, Avri Altman wrote:
>> STOP command does not guarantee to wait while busy, but subsequent
>> command MMC_CMDQ_TASK_MGMT to discard the queue will fail if the
>> card is busy, so be sure to wait by employing mmc_poll_for_busy().
> Doesn't the Task Discard Sequence expects you to check CQDPT[i]==1
> before sending MMC_CMDQ_TASK_MGMT to discard task id i?

We do not clear individual tasks.  Instead the MMC_CMDQ_TASK_MGMT is
sent with the op-code to "discard entire queue", which will also
work even if the queue is empty. Refer JESD84-B51A,
6.6.39.6 CMDQ_TASK_MGMT and Table 43 — Task Management op-codes.

> 
> Thanks,
> Avri
> 
>>
>> Fixes: 72a5af554df8 ("mmc: core: Add support for handling CQE requests")
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
>> ---
>>  drivers/mmc/core/core.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index
>> 3d3e0ca52614..befde2bd26d3 100644
>> --- a/drivers/mmc/core/core.c
>> +++ b/drivers/mmc/core/core.c
>> @@ -553,6 +553,8 @@ int mmc_cqe_recovery(struct mmc_host *host)
>>         cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT;
>>         mmc_wait_for_cmd(host, &cmd, 0);
>>
>> +       mmc_poll_for_busy(host->card, MMC_CQE_RECOVERY_TIMEOUT,
>> true,
>> + MMC_BUSY_IO);
>> +
>>         memset(&cmd, 0, sizeof(cmd));
>>         cmd.opcode       = MMC_CMDQ_TASK_MGMT;
>>         cmd.arg          = 1; /* Discard entire queue */
>> --
>> 2.34.1
>