From OMAP3 SoCs (OMAP3, OMAP4, OMAP5, AM572x, AM571x), the DAT/CMD lines
reset procedure section in TRM suggests to first poll the SRD/SRC bit until it is set to 0x1. But looks like that bit is never set to 1 and there is an observable delay of 1sec everytime the driver tries to reset DAT/CMD. (The same is observed in linux kernel).
Reduce the time the driver waits for the controller to set the SRC/SRD bits to 1 so that there is no observable delay.
Signed-off-by: Kishon Vijay Abraham I kishon@ti.com Signed-off-by: Jean-Jacques Hiblot jjhiblot@ti.com ---
drivers/mmc/omap_hsmmc.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c index 3cfd062..df3f14c 100644 --- a/drivers/mmc/omap_hsmmc.c +++ b/drivers/mmc/omap_hsmmc.c @@ -108,6 +108,7 @@ struct omap_hsmmc_adma_desc {
/* If we fail after 1 second wait, something is really bad */ #define MAX_RETRY_MS 1000 +#define MMC_TIMEOUT_MS 20
/* DMA transfers can take a long time if a lot a data is transferred. * The timeout must take in account the amount of data. Let's assume @@ -598,7 +599,7 @@ static void mmc_reset_controller_fsm(struct hsmmc *mmc_base, u32 bit) if (!(readl(&mmc_base->sysctl) & bit)) { start = get_timer(0); while (!(readl(&mmc_base->sysctl) & bit)) { - if (get_timer(0) - start > MAX_RETRY_MS) + if (get_timer(0) - start > MMC_TIMEOUT_MS) return; } }