Re: [PATCH v2 1/2] sdhci: tegra: Implement Tegra specific set_timeout callback

[Sowjanya Komatineni <skomatineni@nvidia.com>]

On 4/17/20 1:04 AM, Ulf Hansson wrote:
> External email: Use caution opening links or attachments
>
>
> On Thu, 16 Apr 2020 at 21:39, Sowjanya Komatineni
> <skomatineni@nvidia.com> wrote:
>>
>> On 4/16/20 9:29 AM, Sowjanya Komatineni wrote:
>>> On 4/16/20 3:59 AM, Ulf Hansson wrote:
>>>> External email: Use caution opening links or attachments
>>>>
>>>>
>>>> On Wed, 15 Apr 2020 at 19:55, Naresh Kamboju
>>>> <naresh.kamboju@linaro.org> wrote:
>>>>> On Fri, 13 Mar 2020 at 06:41, Sowjanya Komatineni
>>>>> <skomatineni@nvidia.com> wrote:
>>>>>> Tegra host supports HW busy detection and timeouts based on the
>>>>>> count programmed in SDHCI_TIMEOUT_CONTROL register and max busy
>>>>>> timeout it supports is 11s in finite busy wait mode.
>>>>>>
>>>>>> Some operations like SLEEP_AWAKE, ERASE and flush cache through
>>>>>> SWITCH commands take longer than 11s and Tegra host supports
>>>>>> infinite HW busy wait mode where HW waits forever till the card
>>>>>> is busy without HW timeout.
>>>>>>
>>>>>> This patch implements Tegra specific set_timeout sdhci_ops to allow
>>>>>> switching between finite and infinite HW busy detection wait modes
>>>>>> based on the device command expected operation time.
>>>>>>
>>>>>> Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
>>>>>> ---
>>>>>>    drivers/mmc/host/sdhci-tegra.c | 31 +++++++++++++++++++++++++++++++
>>>>>>    1 file changed, 31 insertions(+)
>>>>>>
>>>>>> diff --git a/drivers/mmc/host/sdhci-tegra.c
>>>>>> b/drivers/mmc/host/sdhci-tegra.c
>>>>>> index a25c3a4..fa8f6a4 100644
>>>>>> --- a/drivers/mmc/host/sdhci-tegra.c
>>>>>> +++ b/drivers/mmc/host/sdhci-tegra.c
>>>>>> @@ -45,6 +45,7 @@
>>>>>>    #define SDHCI_TEGRA_CAP_OVERRIDES_DQS_TRIM_SHIFT       8
>>>>>>
>>>>>>    #define SDHCI_TEGRA_VENDOR_MISC_CTRL 0x120
>>>>>> +#define SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT BIT(0)
>>>>>>    #define SDHCI_MISC_CTRL_ENABLE_SDR104                  0x8
>>>>>>    #define SDHCI_MISC_CTRL_ENABLE_SDR50 0x10
>>>>>>    #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 0x20
>>>>>> @@ -1227,6 +1228,34 @@ static u32 sdhci_tegra_cqhci_irq(struct
>>>>>> sdhci_host *host, u32 intmask)
>>>>>>           return 0;
>>>>>>    }
>>>>>>
>>>>>> +static void tegra_sdhci_set_timeout(struct sdhci_host *host,
>>>>>> +                                   struct mmc_command *cmd)
>>>>>> +{
>>>>>> +       u32 val;
>>>>>> +
>>>>>> +       /*
>>>>>> +        * HW busy detection timeout is based on programmed data
>>>>>> timeout
>>>>>> +        * counter and maximum supported timeout is 11s which may
>>>>>> not be
>>>>>> +        * enough for long operations like cache flush, sleep
>>>>>> awake, erase.
>>>>>> +        *
>>>>>> +        * ERASE_TIMEOUT_LIMIT bit of VENDOR_MISC_CTRL register allows
>>>>>> +        * host controller to wait for busy state until the card is
>>>>>> busy
>>>>>> +        * without HW timeout.
>>>>>> +        *
>>>>>> +        * So, use infinite busy wait mode for operations that may
>>>>>> take
>>>>>> +        * more than maximum HW busy timeout of 11s otherwise use
>>>>>> finite
>>>>>> +        * busy wait mode.
>>>>>> +        */
>>>>>> +       val = sdhci_readl(host, SDHCI_TEGRA_VENDOR_MISC_CTRL);
>>>>>> +       if (cmd && cmd->busy_timeout >= 11 * HZ)
>>>>>> +               val |= SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT;
>>>>>> +       else
>>>>>> +               val &= ~SDHCI_MISC_CTRL_ERASE_TIMEOUT_LIMIT;
>>>>>> +       sdhci_writel(host, val, SDHCI_TEGRA_VENDOR_MISC_CTRL);
>>>>>> +
>>>>>> +       __sdhci_set_timeout(host, cmd);
>>>>> kernel build on arm and arm64 architecture failed on stable-rc 4.19
>>>>> (arm), 5.4 (arm64) and 5.5 (arm64)
>>>>>
>>>>> drivers/mmc/host/sdhci-tegra.c: In function 'tegra_sdhci_set_timeout':
>>>>> drivers/mmc/host/sdhci-tegra.c:1256:2: error: implicit declaration of
>>>>> function '__sdhci_set_timeout'; did you mean
>>>>> 'tegra_sdhci_set_timeout'? [-Werror=implicit-function-declaration]
>>>>>     __sdhci_set_timeout(host, cmd);
>>>>>     ^~~~~~~~~~~~~~~~~~~
>>>>>     tegra_sdhci_set_timeout
>>>>>
>>>>> Full build log,
>>>>> https://ci.linaro.org/view/lkft/job/openembedded-lkft-linux-stable-rc-5.5/DISTRO=lkft,MACHINE=am57xx-evm,label=docker-lkft/83/consoleText
>>>>>
>>>>> https://ci.linaro.org/view/lkft/job/openembedded-lkft-linux-stable-rc-5.4/DISTRO=lkft,MACHINE=juno,label=docker-lkft/158/consoleText
>>>>>
>>>>> https://ci.linaro.org/view/lkft/job/openembedded-lkft-linux-stable-rc-4.19/DISTRO=lkft,MACHINE=am57xx-evm,label=docker-lkft/511/consoleText
>>>>>
>>>>>
>>>>> - Naresh
>>>> Thanks for reporting! What a mess.
>>>>
>>>> It turns out that the commit that was queued for stable that is
>>>> causing the above errors, also requires another commit.
>>>>
>>>> The commit that was queued:
>>>> 5e958e4aacf4 ("sdhci: tegra: Implement Tegra specific set_timeout
>>>> callback")
>>>>
>>>> The additional commit needed (which was added in v5.6-rc1):
>>>> 7d76ed77cfbd ("mmc: sdhci: Refactor sdhci_set_timeout()")
>>>>
>>>> However, the above commit needs a manual backport (quite trivial, but
>>>> still) for the relevant stable kernels, to allow it to solve the build
>>>> problems.
>>>>
>>>> Greg, Sasha - I suggest you to drop the offending commit from the
>>>> stable kernels, for now. I think it's better to let Sowjanya deal with
>>>> the backports, then send them in small series instead.
>>>>
>>>> Kind regards
>>>> Uffe
>>> Hi Ufee,
>>>
>>> Will back-porting below commit cause any issues to other vendors?
>>>
>>> 7d76ed77cfbd ("mmc: sdhci: Refactor sdhci_set_timeout()")
>>>
>> sdhci-tegra driver in 4.19 is using same sdhci_ops for Tegra114 and
>> Tegra210 and separate sdhci_ops for T210 started from 4.20.
>>
>> 5e958e4aacf4 ("sdhci: tegra: Implement Tegra specific set_timeout callback")
>>
>> So above commit can't be applied to 4.19. So probably a separate patch
>> need to be created to apply for 4.19 and back port above commit along
>> with its dependency commit (7d76ed77cfbd ("mmc: sdhci: Refactor
>> sdhci_set_timeout()") for 5.4 and 5.4.
> Alright, seems reasonable. Just keep me/Adrian on cc when/if you post
> the patches so we can ack them.
>
> Kind regards
> Uffe

Sure, will send patches to backport both below changes to 4.19

5e958e4aacf4 ("sdhci: tegra: Implement Tegra specific set_timeout
callback")

7d76ed77cfbd ("mmc: sdhci: Refactor sdhci_set_timeout()")

But on 5.5 and on 5.4.33,  patch "mmc: sdhci: Refactor 
sdhci_set_timeout() already committed but not on 5.4.32 and prior.

So, not sure why kbuild reported error on 5.4 and 5.5 with 
__sdhci_set_timeout when this patch is already committed on 5.4.33 
(26711cc7e064) and 5.5.18 (71bab39fa67d)

Can you please help clarify this?


drivers/mmc/host/sdhci-tegra.c: In function 'tegra_sdhci_set_timeout':
drivers/mmc/host/sdhci-tegra.c:1256:2: error: implicit declaration of
function '__sdhci_set_timeout'; did you mean
'tegra_sdhci_set_timeout'? [-Werror=implicit-function-declaration]
    __sdhci_set_timeout(host, cmd);


Thanks

Sowjanya