From: mingming lee <mingming.lee@mediatek.com>
Date: Tue, 31 Dec 2019 03:29:25 +0000 (+0800)
Subject: mmc: mtk-sd: fix hang when data read quickly
X-Git-Tag: v2020.10~413^2~18
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=fb80eaa9d8c15840bbceb4b8152c3759a84ae39e;p=platform%2Fkernel%2Fu-boot.git

mmc: mtk-sd: fix hang when data read quickly

For CMD21 tuning data, the 128/64 bytes data may coming in very
short time, before msdc_start_data(), the read data has already
come, in this case, clear MSDC_INT will cause the interrupt disappear
and lead to the thread hang.

the solution is just clear all interrupts before command was sent.

Signed-off-by: mingming lee <mingming.lee@mediatek.com>
---

diff --git a/drivers/mmc/mtk-sd.c b/drivers/mmc/mtk-sd.c
index 2341373..b036587 100644
--- a/drivers/mmc/mtk-sd.c
+++ b/drivers/mmc/mtk-sd.c
@@ -14,7 +14,6 @@
 #include <malloc.h>
 #include <mapmem.h>
 #include <stdbool.h>
-#include <watchdog.h>
 #include <asm/gpio.h>
 #include <dm/pinctrl.h>
 #include <linux/bitops.h>
@@ -531,6 +530,7 @@ static int msdc_start_command(struct msdc_host *host, struct mmc_cmd *cmd,
 		blocks = data->blocks;
 
 	writel(CMD_INTS_MASK, &host->base->msdc_int);
+	writel(DATA_INTS_MASK, &host->base->msdc_int);
 	writel(blocks, &host->base->sdc_blk_num);
 	writel(cmd->cmdarg, &host->base->sdc_arg);
 	writel(rawcmd, &host->base->sdc_cmd);
@@ -677,13 +677,9 @@ static int msdc_start_data(struct msdc_host *host, struct mmc_data *data)
 	u32 size;
 	int ret;
 
-	WATCHDOG_RESET();
-
 	if (data->flags == MMC_DATA_WRITE)
 		host->last_data_write = 1;
 
-	writel(DATA_INTS_MASK, &host->base->msdc_int);
-
 	size = data->blocks * data->blocksize;
 
 	if (data->flags == MMC_DATA_WRITE)