[U-Boot] [PATCH] MMC: DWMMC: Fix FIFO_DEPTH calculation

[Rajeshwari Shinde]

Current DWMMC driver used to give FIFO underrun/overrun error every 3rd time
for mmc rescan command.
In current code FIFO_DEPTH is getting calculated after reading the FIFOTH
register and extracting the RX_WMARK bits from it i.e (RX_WMARK = FIFO_DEPTH/2 -1).
Instead of storing the correct value, we were recalculating the FIFO_DEPT each
time which is not correct.

Signed-off-by: Hatim Ali <hatim.rv at samsung.com>
Signed-off-by: Rajeshwari Shinde <rajeshwari.s at samsung.com>
---
 drivers/mmc/dw_mmc.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 4070d4e..be590a4 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -332,11 +332,13 @@ static int dwmci_init(struct mmc *mmc)
 	dwmci_writel(host, DWMCI_BMOD, 1);
 
 	fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
-	if (host->fifoth_val)
+	if (host->fifoth_val) {
 		fifoth_val = host->fifoth_val;
-	else
+	} else {
 		fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size/2 -1) |
 			TX_WMARK(fifo_size/2);
+		host->fifoth_val = fifoth_val;
+	}
 	dwmci_writel(host, DWMCI_FIFOTH, fifoth_val);
 
 	dwmci_writel(host, DWMCI_CLKENA, 0);
-- 
1.7.4.4