scsi: ufs: core: Increase fDeviceInit poll frequency

UFS devices are expected to clear fDeviceInit flag in single digit
milliseconds. Current values of 5 to 10 millisecond sleep add to increased
latency during the initialization and resume path. This CL lowers the sleep
range to 500 to 1000 microseconds.

Link: https://lore.kernel.org/r/20220421002429.3136933-1-bvanassche@acm.org
Acked-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Konstantin Vyshetsky <vkon@google.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 3f9caaf..ba9c7f9 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4438,7 +4438,7 @@ static int ufshcd_complete_dev_init(struct ufs_hba *hba)
                                        QUERY_FLAG_IDN_FDEVICEINIT, 0, &flag_res);
                if (!flag_res)
                        break;
-               usleep_range(5000, 10000);
+               usleep_range(500, 1000);
        } while (ktime_before(ktime_get(), timeout));
 
        if (err) {