[PATCH 6.6 125/189] scsi: ufs: core: Fix hba->last_dme_cmd_tstamp timestamp updating logic

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6.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vamshi Gajjela <vamshigajjela@xxxxxxxxxx>

commit ab9fd06cb8f0db0854291833fc40c789e43a361f upstream.

The ufshcd_add_delay_before_dme_cmd() always introduces a delay of
MIN_DELAY_BEFORE_DME_CMDS_US between DME commands even when it's not
required. The delay is added when the UFS host controller supplies the
quirk UFSHCD_QUIRK_DELAY_BEFORE_DME_CMDS.

Fix the logic to update hba->last_dme_cmd_tstamp to ensure subsequent DME
commands have the correct delay in the range of 0 to
MIN_DELAY_BEFORE_DME_CMDS_US.

Update the timestamp at the end of the function to ensure it captures the
latest time after any necessary delay has been applied.

Signed-off-by: Vamshi Gajjela <vamshigajjela@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20240724135126.1786126-1-vamshigajjela@xxxxxxxxxx
Fixes: cad2e03d8607 ("ufs: add support to allow non standard behaviours (quirks)")
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/ufs/core/ufshcd.c |   11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -3971,11 +3971,16 @@ static inline void ufshcd_add_delay_befo
 			min_sleep_time_us =
 				MIN_DELAY_BEFORE_DME_CMDS_US - delta;
 		else
-			return; /* no more delay required */
+			min_sleep_time_us = 0; /* no more delay required */
 	}
 
-	/* allow sleep for extra 50us if needed */
-	usleep_range(min_sleep_time_us, min_sleep_time_us + 50);
+	if (min_sleep_time_us > 0) {
+		/* allow sleep for extra 50us if needed */
+		usleep_range(min_sleep_time_us, min_sleep_time_us + 50);
+	}
+
+	/* update the last_dme_cmd_tstamp */
+	hba->last_dme_cmd_tstamp = ktime_get();
 }
 
 /**






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