在 2022/7/26 16:31, Jaehoon Chung 写道:
On 7/13/22 16:32, [email protected] wrote:
From: qianfan Zhao <[email protected]>
watchdog will reset when 'mmc read' or 'ext4load' a large file from mmc
device. Reset watchdog when accessing mmc device.
I don't know why this patch is need.
Hi:
maybe your's board doesn't have a hardware watchdog.
on my board there has a gpio watchdog and we should trigger it no more
than 1.2 second.
otherwise it will reset CPU.
But 'mmc read' command doesn't trigger watchdog, it's ok if we load a
smaller
imges, but if we load a very bigger image which more than 100MiB, the
watchdog will
dead and trigger a system reset.
So I make this patch to make sure we can trigger watchdog while loading
mmc.
Best Regards,
Jaehoon Chung
Signed-off-by: qianfan Zhao <[email protected]>
---
drivers/mmc/mmc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 4d9871d69f..27ffdb7fa7 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -24,6 +24,7 @@
#include <memalign.h>
#include <linux/list.h>
#include <div64.h>
+#include <watchdog.h>
#include "mmc_private.h"
#define DEFAULT_CMD6_TIMEOUT_MS 500
@@ -297,6 +298,7 @@ int mmc_poll_for_busy(struct mmc *mmc, int timeout_ms)
if (timeout_ms-- <= 0)
break;
+ WATCHDOG_RESET();
udelay(1000);
}
@@ -500,6 +502,8 @@ ulong mmc_bread(struct blk_desc *block_dev, lbaint_t start, lbaint_t blkcnt,
blocks_todo -= cur;
start += cur;
dst += cur * mmc->read_bl_len;
+
+ WATCHDOG_RESET();
} while (blocks_todo > 0);
return blkcnt;
