diff mbox series

[U-Boot,v3,08/24] mmc: omap_hsmmc: Reduce the max timeout for reset controller fsm

Message ID 1517324513-13875-9-git-send-email-jjhiblot@ti.com
State Accepted
Delegated to: Jaehoon Chung
Headers show
Series omap_hsmmc: Add support for HS200 and UHS modes | expand

Commit Message

Jean-Jacques Hiblot Jan. 30, 2018, 3:01 p.m. UTC 
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>
---

Changes in v3: None

 drivers/mmc/omap_hsmmc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/mmc/omap_hsmmc.c b/drivers/mmc/omap_hsmmc.c
index 5523210..ab4a095 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;
 		}
 	}