linux-kernel - Re: [PATCH V1 1/2] mmc: sdhci: Introduce new quirk to use reserved timeout

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Date:   Tue, 19 May 2020 19:38:23 +0530
From:   sartgarg@...eaurora.org
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Veerabhadrarao Badiganti <vbadigan@...eaurora.org>,
        Sahitya Tummala <stummala@...eaurora.org>,
        linux-mmc@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        linux-mmc-owner@...r.kernel.org
Subject: Re: [PATCH V1 1/2] mmc: sdhci: Introduce new quirk to use reserved
 timeout

On 2020-05-18 18:20, Ulf Hansson wrote:
> On Mon, 18 May 2020 at 13:45, Adrian Hunter <adrian.hunter@...el.com> 
> wrote:
>> 
>> On 18/05/20 12:39 pm, Ulf Hansson wrote:
>> > On Wed, 6 May 2020 at 15:53, Sarthak Garg <sartgarg@...eaurora.org> wrote:
>> >>
>> >> Introduce a new quirk for letting vendor drivers to use reserved
>> >> timeout value (0xF) in timeout control register.
>> >>
>> >> Signed-off-by: Sahitya Tummala <stummala@...eaurora.org>
>> >> Signed-off-by: Sarthak Garg <sartgarg@...eaurora.org>
>> >> ---
>> >>  drivers/mmc/host/sdhci.c | 3 ++-
>> >>  drivers/mmc/host/sdhci.h | 5 +++++
>> >>  2 files changed, 7 insertions(+), 1 deletion(-)
>> >>
>> >> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> >> index 1bb6b67..07528a9 100644
>> >> --- a/drivers/mmc/host/sdhci.c
>> >> +++ b/drivers/mmc/host/sdhci.c
>> >> @@ -967,7 +967,8 @@ static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_command *cmd,
>> >>         }
>> >>
>> >>         if (count >= 0xF) {
>> >> -               if (!(host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT))
>> >> +               if (!(host->quirks2 & SDHCI_QUIRK2_DISABLE_HW_TIMEOUT) ||
>> >> +               !(host->quirks2 & SDHCI_QUIRK2_USE_RESERVED_MAX_TIMEOUT))
>> >
>> > I don't quite get how this can make your variant use 0xF rather than 0xE?
>> >
>> > To me it looks like an updated conditional check to print a debug message, no?
>> 
>> Probably need to introduce host->max_timeout_count, set it to 0xE in
>> sdhci_alloc_host(), and change sdhci_calc_timeout() to use it in place 
>> of
>> all the 0xE and 0xF constants.
> 
> Yep, that seems like a reasonable approach to me as well.
> 
> [...]
> 
> Kind regards
> Uffe

Resending the mail again as can't see my comment on the 
https://patchwork.kernel.org/ page.
Sorry for the mistake just want to update the logic as below.
-               count = 0xE;
+               if(!(host->quirks2 & 
SDHCI_QUIRK2_USE_RESERVED_MAX_TIMEOUT))
+                       count = 0xE;