[U-Boot] [PATCH] arm: mmc: increase MMC SDHCI read status timeout

[Steve Rae]

Hi Stefan,

On Tue, Jun 28, 2016 at 8:00 AM, Stefan Roese <sr at denx.de> wrote:
> Hi Steve,
>
> On 27.06.2016 23:43, Steve Rae wrote:
>>
>> Otherwise,  ocassionally see errors like this:
>>    Flashing sparse image at offset 2078720
>>    Flashing Sparse Image
>>    sdhci_send_command: Timeout for status update!
>>    mmc fail to send stop cmd
>>    write_sparse_image: Write failed, block #2181088 [0]
>>
>> This does not affect the actual writing speed, which is controlled by
>> the default value:
>>    CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT
>>
>> It only increases the retries when reading:
>>    SDHCI_INT_STATUS
>> to avoid the timeout error.
>>
>> Signed-off-by: Steve Rae <steve.rae at raedomain.com>
>> ---
>> as per the discussion in:
>> http://lists.denx.de/pipermail/u-boot/2016-June/258966.html
>> this supercedes:
>> http://patchwork.ozlabs.org/patch/615994/
>
>
> IIRC, I've suggested to move SDHCI_CMD_DEFAULT_TIMEOUT to Kconfig
> and use the old value as default value. So that you can overwrite
> it for your board / platform via your defconfig. But I have no
> strong feelings here - your current version also works for
> me and does not "clutter" the Kconfig subsystem with too many
> values. So:
>
> Reviewed-by: Stefan Roese <sr at denx.de>
>
> Thanks,
> Stefan
>

Thanks for the review...
I didn't want to touch the "performance" algorithm related to
SDHCI_CMD_DEFAULT_TIMEOUT (which maybe should be in Kconfig).
However, the retry loop related to SDHCI_READ_STATUS_TIMEOUT doesn't need to
be in Kconfig -- it is just a define.
Thanks, Steve

>>   drivers/mmc/sdhci.c | 5 +++--
>>   1 file changed, 3 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
>> index 5c71ab8..aa4cd4f 100644
>> --- a/drivers/mmc/sdhci.c
>> +++ b/drivers/mmc/sdhci.c
>> @@ -127,6 +127,7 @@ static int sdhci_transfer_data(struct sdhci_host
>> *host, struct mmc_data *data,
>>   #define CONFIG_SDHCI_CMD_MAX_TIMEOUT          3200
>>   #endif
>>   #define CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT      100
>> +#define CONFIG_SDHCI_READ_STATUS_TIMEOUT       1000
>>
>>   static int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
>>                        struct mmc_data *data)
>> @@ -243,9 +244,9 @@ static int sdhci_send_command(struct mmc *mmc, struct
>> mmc_cmd *cmd,
>>                 if (stat & SDHCI_INT_ERROR)
>>                         break;
>>         } while (((stat & mask) != mask) &&
>> -                (get_timer(start) < CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT));
>> +                (get_timer(start) < CONFIG_SDHCI_READ_STATUS_TIMEOUT));
>>
>> -       if (get_timer(start) >= CONFIG_SDHCI_CMD_DEFAULT_TIMEOUT) {
>> +       if (get_timer(start) >= CONFIG_SDHCI_READ_STATUS_TIMEOUT) {
>>                 if (host->quirks & SDHCI_QUIRK_BROKEN_R1B)
>>                         return 0;
>>                 else {
>>
>
> Viele Grüße,
> Stefan
>
> --
> DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: (+49)-8142-66989-51 Fax: (+49)-8142-66989-80 Email: sr at denx.de