From: Arend van Spriel Date: Sat, 4 Jan 2014 12:51:26 +0000 (+0100) Subject: sdhci: only reprogram retuning timer when flag is set X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2bc024855e881c697fc9bf9799f377c392192a43;p=linux-beck.git sdhci: only reprogram retuning timer when flag is set 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. Signed-off-by: Arend van Spriel Acked-by: Ulf Hansson Reviewed-by: Aaron Lu Signed-off-by: Chris Ball --- diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 04a5e257a2ab..9a79fc4b60ca 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); } /*