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Code Issues Releases Wiki Activity

scsi: ufs: Fix NOP OUT timeout value

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Boot occasionally fails with some Samsung low-power UFS devices. The reason
is that these devices have a little bit higher latency for NOP OUT
responses. This causes boot to fail because the NOP OUT command is issued
during initialization to check whether the device transport protocol is
ready or not. Increase NOP_OUT_TIMEOUT value from 30 to 50ms.

Link: https://lore.kernel.org/r/231786897.01599016081767.JavaMail.epsvc@epcpadp2
Acked-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Daejun Park <daejun7.park@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Daejun Park 2020-09-02 11:58:52 +09:00 committed by Martin K. Petersen
parent 3d49f7426e
commit 782e2efb74
1 changed files with 2 additions and 2 deletions
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4
drivers/scsi/ufs/ufshcd.c
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@ -36,8 +36,8 @@
/* NOP OUT retries waiting for NOP IN response */
#define NOP_OUT_RETRIES 10
/* Timeout after 30 msecs if NOP OUT hangs without response */
#define NOP_OUT_TIMEOUT 30 /* msecs */
/* Timeout after 50 msecs if NOP OUT hangs without response */
#define NOP_OUT_TIMEOUT 50 /* msecs */
/* Query request retries */
#define QUERY_REQ_RETRIES 3