[U-Boot] [PATCH 2/2] mmc: dw_mmc: fix data starvation by host timeout under FIFO mode

[Ziyuan Xu]

This patch fixes data starvation by host timeout(HTO) error interrupt
which occurred under FIFO mode transfer on rk3036 board.

The former implement, the actual bytes were transmitted may be less than
should be. The size will still subtract value of len in case of there is
no receive/transmit FIFO data request interrupt.

Signed-off-by: Ziyuan Xu <xzy.xu at rock-chips.com>
---

 drivers/mmc/dw_mmc.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 38d4a64..41b7035 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -120,6 +120,7 @@ static int dwmci_data_transfer(struct dwmci_host *host, struct mmc_data *data)
 		}
 
 		if (host->fifo_mode && size) {
+			len = 0;
 			if (data->flags == MMC_DATA_READ) {
 				if ((dwmci_readl(host, DWMCI_RINTSTS) &
 				     DWMCI_INTMSK_RXDR)) {
-- 
1.9.1