From 720724d09852858a3938f7bfcbbb3d1a0fdd6b4c Mon Sep 17 00:00:00 2001
From: Xu Ziyuan <xzy.xu@rock-chips.com>
Date: Thu, 28 Jul 2016 10:25:48 +0800
Subject: [PATCH] mmc: dw_mmc: fix data starvation by host timeout under FIFO
mode
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@rock-chips.com>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.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 a0a582b442..afc674dd14 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -119,6 +119,7 @@ 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)) {
--
2.39.5