On 02/21/2014 08:59 PM, Arend van Spriel wrote:
> When the host->tuning_count is zero it means that the
> retuning is disabled. This is checked on the first
> run of sdhci_execute_tuning() by the if statement below:
>
> if (!(host->flags & SDHCI_NEEDS_RETUNING) && host->tuning_count &&
> (host->tuning_mode == SDHCI_TUNING_MODE_1)) {
>
> So only when tuning_count is non-zero it will set the host
> flag SDHCI_USING_RETUNING_TIMER. The else statement is only
> for re-programming the timer, which means that flag must be
> set. Because that is not checked the else statement is executed
> in the first run when tuning_count is zero.
>
> This was seen on a host controller which indicated
> SDHCI_TUNING_MODE_1 (0) and tuning_count being zero. Suspect
> that (one of) these registers is not properly set.
>
> Cc: Dong Aisheng <dongas86@xxxxxxxxx>
> Cc: Aaron Lu <aaron.lwe@xxxxxxxxx>
> Signed-off-by: Arend van Spriel <arend@xxxxxxxxxxxx>
> ---
> Noticed this patch was still not applied so please reconsider
> taking it in and let me know. The patch has been rebased and
> applies to the mmc-next branch.
ping? Am I on some spam filter? What is needed to get this change applied?
Regards,
Arend
> Regards,
> Arend
>
> V3:
> - remote tuning mode check for retuning timer reload
>
> V2:
> - add more explanation to the commit message
> - check host flag SDHCI_USING_RETUNING_TIMER
> ---
> drivers/mmc/host/sdhci.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 9ddef47..d5b421d 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -2026,12 +2026,11 @@ out:
> host->tuning_count * HZ);
> /* Tuning mode 1 limits the maximum data length to 4MB */
> mmc->max_blk_count = (4 * 1024 * 1024) / mmc->max_blk_size;
> - } else {
> + } else if (host->flags & SDHCI_USING_RETUNING_TIMER) {
> host->flags &= ~SDHCI_NEEDS_RETUNING;
> /* Reload the new initial value for timer */
> - if (host->tuning_mode == SDHCI_TUNING_MODE_1)
> - mod_timer(&host->tuning_timer, jiffies +
> - host->tuning_count * HZ);
> + mod_timer(&host->tuning_timer, jiffies +
> + host->tuning_count * HZ);
> }
>
> /*
>
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