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scsi: ufs: core: Fix hba->last_dme_cmd_tstamp timestamp updating logic

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commit ab9fd06cb8 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@google.com>
Link: https://lore.kernel.org/r/20240724135126.1786126-1-vamshigajjela@google.com
Fixes: cad2e03d86 ("ufs: add support to allow non standard behaviours (quirks)")
Cc: stable@vger.kernel.org
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vamshi Gajjela 2024-07-24 19:21:26 +05:30 committed by Greg Kroah-Hartman
parent df8e734ae5
commit 8f783731e3
1 changed files with 8 additions and 3 deletions
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11
drivers/scsi/ufs/ufshcd.c
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@ -3569,11 +3569,16 @@ static inline void ufshcd_add_delay_before_dme_cmd(struct ufs_hba *hba)
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();
}
/**