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scsi: ufs: disable ah8 during suspend and enable it on resume

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Auto hibern8 is useful during active requests for efficient power
savings. Since we are anyway in suspend path, disable auto
hibern8 until a successful resume. This prevents unnecessary hibern8
enter/exit during the suspend/resume path.

Change-Id: Ie5a76dddd662e67ae8ce6e6f37f437ff4665b066
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
This commit is contained in:
Venkat Gopalakrishnan 2016-08-04 17:56:57 -07:00
parent e94b446eac
commit 33ee9fb701
1 changed files with 18 additions and 0 deletions
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18
drivers/scsi/ufs/ufshcd.c
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@ -7977,6 +7977,13 @@ static int ufshcd_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
hba->clk_gating.is_suspended = true;
hba->hibern8_on_idle.is_suspended = true;
/*
* Disable auto hibern8 to prevent unnecessary hibern8 enter/exit
* during suspend path
*/
if (ufshcd_is_auto_hibern8_supported(hba))
ufshcd_set_auto_hibern8_timer(hba, 0);
if (hba->clk_scaling.is_allowed) {
cancel_work_sync(&hba->clk_scaling.suspend_work);
cancel_work_sync(&hba->clk_scaling.resume_work);
@ -8084,6 +8091,10 @@ enable_gating:
ufshcd_resume_clkscaling(hba);
hba->hibern8_on_idle.is_suspended = false;
hba->clk_gating.is_suspended = false;
/* Re-enable auto hibern8 in case of suspend failure */
if (ufshcd_is_auto_hibern8_supported(hba))
ufshcd_set_auto_hibern8_timer(hba,
hba->hibern8_on_idle.delay_ms);
ufshcd_release_all(hba);
out:
hba->pm_op_in_progress = 0;
@ -8177,6 +8188,13 @@ static int ufshcd_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
if (hba->clk_scaling.is_allowed)
ufshcd_resume_clkscaling(hba);
/*
* Enable auto hibern8 after successful resume to prevent
* unnecessary hibern8 enter/exit during resume path
*/
if (ufshcd_is_auto_hibern8_supported(hba))
ufshcd_set_auto_hibern8_timer(hba,
hba->hibern8_on_idle.delay_ms);
/* Schedule clock gating in case of no access to UFS device yet */
ufshcd_release_all(hba);
goto out;