在 2022/7/26 16:31, Jaehoon Chung 写道:
On 7/13/22 16:32, qianfanguijin@163.com wrote:
From: qianfan Zhao qianfanguijin@163.com
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 qianfanguijin@163.com
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();@@ -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;