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From:   Jon Hunter <jonathanh@nvidia.com>
Subject: Re: LKFT: arm x15: mmc1: cache flush error -110
To:     Ulf Hansson <ulf.hansson@linaro.org>,
        Bitan Biswas <bbiswas@nvidia.com>,
        Adrian Hunter <adrian.hunter@intel.com>
CC:     Naresh Kamboju <naresh.kamboju@linaro.org>,
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On 24/02/2020 11:16, Ulf Hansson wrote:
> + Adrian
> 
> On Fri, 21 Feb 2020 at 20:44, Bitan Biswas <bbiswas@nvidia.com> wrote:
>>
>> On 2/21/20 1:48 AM, Ulf Hansson wrote:
>>> External email: Use caution opening links or attachments
>>>
>>>
>>> On Thu, 20 Feb 2020 at 18:54, Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
>>>>
>>>> On Wed, 19 Feb 2020 at 21:54, Ulf Hansson <ulf.hansson@linaro.org> wrote:
>>>>>
>>>>> On Thu, 13 Feb 2020 at 16:43, Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
>>>>>>
>>>>>
>>>>> Try to restore the value for the cache flush timeout, by updating the
>>>>> define MMC_CACHE_FLUSH_TIMEOUT_MS to 10 * 60 * 1000".
>>>>
>>>> I have increased the timeout to 10 minutes but it did not help.
>>>> Same error found.
>>>> [  608.679353] mmc1: Card stuck being busy! mmc_poll_for_busy
>>>> [  608.684964] mmc1: cache flush error -110
>>>> [  608.689005] blk_update_request: I/O error, dev mmcblk1, sector
>>>> 4302400 op 0x1:(WRITE) flags 0x20800 phys_seg 1 prio class 0
>>>>
>>>> OTOH, What best i could do for my own experiment to revert all three patches and
>>>> now the reported error gone and device mount successfully [1].
>>>>
>>>> List of patches reverted,
>>>>    mmc: core: Specify timeouts for BKOPS and CACHE_FLUSH for eMMC
>>>>    mmc: block: Use generic_cmd6_time when modifying
>>>>      INAND_CMD38_ARG_EXT_CSD
>>>>    mmc: core: Default to generic_cmd6_time as timeout in __mmc_switch()


Reverting all the above also fixes the problem for me.

>>   I find that from the commit the changes in mmc_flush_cache below is
>> the cause.
>>
>> ##
>> @@ -961,7 +963,8 @@ int mmc_flush_cache(struct mmc_card *card)
>>                          (card->ext_csd.cache_size > 0) &&
>>                          (card->ext_csd.cache_ctrl & 1)) {
>>                  err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> -                               EXT_CSD_FLUSH_CACHE, 1, 0);
>> +                                EXT_CSD_FLUSH_CACHE, 1,
>> +                                MMC_CACHE_FLUSH_TIMEOUT_MS);


I no longer see the issue on reverting the above hunk as Bitan suggested
but now I see the following (which is expected) ...

 WARNING KERN mmc1: unspecified timeout for CMD6 - use generic

> Just as a quick sanity test, please try the below patch, which
> restores the old cache flush timeout to 10min.
> 
> However, as I indicated above, this seems to be a problem that needs
> to be fixed at in the host driver side. For the sdhci driver, there is
> a bit of a tricky logic around how to deal with timeouts in
> sdhci_send_command(). My best guess is that's where we should look
> more closely (and I am doing that).
> 
> From: Ulf Hansson <ulf.hansson@linaro.org>
> Date: Mon, 24 Feb 2020 11:43:33 +0100
> Subject: [PATCH] mmc: core: Restore busy timeout for eMMC cache flushing
> 
> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
> ---
>  drivers/mmc/core/mmc_ops.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
> index da425ee2d9bf..713e7dd6d028 100644
> --- a/drivers/mmc/core/mmc_ops.c
> +++ b/drivers/mmc/core/mmc_ops.c
> @@ -21,7 +21,7 @@
> 
>  #define MMC_OPS_TIMEOUT_MS             (10 * 60 * 1000) /* 10min*/
>  #define MMC_BKOPS_TIMEOUT_MS           (120 * 1000) /* 120s */
> -#define MMC_CACHE_FLUSH_TIMEOUT_MS     (30 * 1000) /* 30s */
> +#define MMC_CACHE_FLUSH_TIMEOUT_MS     (10 * 60 * 1000) /* 10min */

This does not fix the problem for me.

Jon

-- 
nvpublic