From c232f457e409b34417166596ea3daf298ace95c9 Mon Sep 17 00:00:00 2001 From: Jean Pihet Date: Wed, 11 Feb 2009 13:11:39 -0800 Subject: omap_hsmmc: recover from transfer failures Timeouts during a command that has a data phase can result in the next command issued after the command that failed not being processed, i.e. no interrupt ever occurs to indicate the command has completed. This failure can result in a deadlock. This patch resets the data state machine to clear the error in case of a command timeout. Tested on OMAP3430 chip and intensive MMC/SD device removal while transferring data. Signed-off-by: Andy Lowe Signed-off-by: Jean Pihet Signed-off-by: Adrian Hunter Signed-off-by: Andrew Morton Acked-by: Tony Lindgren Signed-off-by: Pierre Ossman --- drivers/mmc/host/omap_hsmmc.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c index 3bfd0facb79..8d21a07f63d 100644 --- a/drivers/mmc/host/omap_hsmmc.c +++ b/drivers/mmc/host/omap_hsmmc.c @@ -417,8 +417,15 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id) } end_cmd = 1; } - if (host->data) + if (host->data) { mmc_dma_cleanup(host); + OMAP_HSMMC_WRITE(host->base, SYSCTL, + OMAP_HSMMC_READ(host->base, + SYSCTL) | SRD); + while (OMAP_HSMMC_READ(host->base, + SYSCTL) & SRD) + ; + } } if ((status & DATA_TIMEOUT) || (status & DATA_CRC)) { -- cgit v1.2.3