If dma is enabled, it'll be cleared when reset all is performed, this can be observed on some platforms, such as P2041 which has a version 2.3 controller, but platform like P4080 which has a version 2.2 controller, does not suffer this, so we will check if the dma is enabled, we should restore it after reset all.
Signed-off-by: Shaohui Xie <[email protected]> --- based on http://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc.git, branch 'for-linus'. changes for v2: call the wrapper API instead of access the register directly. drivers/mmc/host/sdhci.c | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 19ed580..cf6a048 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -214,6 +214,11 @@ static void sdhci_reset(struct sdhci_host *host, u8 mask) if (host->quirks & SDHCI_QUIRK_RESTORE_IRQS_AFTER_RESET) sdhci_clear_set_irqs(host, SDHCI_INT_ALL_MASK, ier); + + if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) { + if ((host->ops->enable_dma) && (mask & SDHCI_RESET_ALL)) + host->ops->enable_dma(host); + } } static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios); -- 1.6.4 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
