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From:   Sowjanya Komatineni <skomatineni@nvidia.com>
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Date:   Tue, 10 Mar 2020 10:27:46 -0700
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On 3/10/20 10:09 AM, Ulf Hansson wrote:
> External email: Use caution opening links or attachments
>
>
> [...]
>
>>>>> I would like to get the regression fixed asap, but I also would like
>>>>> to avoid reverting patches, unless really necessary. May I propose the
>>>>> following two options.
>>>>>
>>>>> 1. Find out why polling with ->card_busy() or CMD13, for a CMD6 with
>>>>> an R1 response doesn't work - and then fix that behaviour.
>>>>>
>>>>> 2. Set the mmc->max_busy_timeout to zero for sdhci-tegra, which makes
>>>>> the core to always use R1B for CMD6 (and erase). This also means that
>>>>> when the cmd->busy_timeout becomes longer than 11s, sdhci-tegra must
>>>>> disable the HW busy timeout and just wait "forever".
>>>>>
>>>>> If you decide for 2, you can add the software timeout support on top,
>>>>> but make that can be considered as a next step of an improvement,
>>>>> rather than needed as fix. Note that, I believe there are some support
>>>>> for software timeout already in the sdhci core, maybe you need to
>>>>> tweak it a bit for your case, I don't know.
>>>>>
>>>>> Kind regards
>>>>> Uffe
>>>> Hi Uffe
>>>>
>>>> Will go with 2nd option and will send patches out when ready.
>>> Okay, good.
>>>
>>>> BTW, Tegra host also supports SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK for
>>>> data timeout based on host clock when using finite mode (HW busy
>>>> detection based on DATA TIMEOUT count value when cmd operation timeout
>>>> is < 11s for tegra host).
>>>>
>>>> So, looks like we cant set host max_busy_timeout to 0 for Tegra host to
>>>> force R1B during SWITCH and SLEEP_AWAKE.
>>>>
>>>> So, was thinking to introduce host capability MMC_CAP2_LONG_WAIT_HW_BUSY
>>>> which can be used for hosts supporting long or infinite HW busy wait
>>>> detection and will update mmc and mmc_ops drivers to not allow convert
>>>> R1B to R1B for hosts with this capability during SLEEP_AWAKE and SWITCH.
>>> That seems reasonable, it becomes probably both easier and clearer by
>>> adding a new host cap.
>>>
>>> In any case, let me help out and cook a patch for this for the core
>>> part (I leave the sdhci change to you). It may be a bit tricky,
>>> especially since I have currently queued a bunch of new changes for
>>> v5.7, that enables more users of mmc_poll_for_busy() in the core.
>>> Maybe I need to temporarily drop them, so we can fix these problems
>>> first. I will check.
>>>
>>> Probably, I would also name the cap MMC_CAP_HW_NEED_RSP_BUSY, as that
>>> seems to be describing the common problem we have for sdhci
>>> omap/tegra.
>>>
>>> Finally, it seems like MMC_CAP_WAIT_WHILE_BUSY should be set for
>>> sdhci- tegra, so while at it, perhaps you can cook a patch for that as
>>> well.
>>>
>>> Kind regards
>>> Uffe
>> OK, I sent v1 yesterday. Please ignore them then.
> Oh, I haven't seen them. In any case, I am ignoring them.
>
>> Will send out patches only for HW busy wait modes program based on cmd
>> timeout and WAIT_WHILE_BUSY enabled.
> Great, thanks!
>
> Please help test the series I just posted as well, if you have the
> time ofcourse.
>
> Kind regards
> Uffe

Sure,

Thanks

Sowjanya