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scsi: ufs: reduce auto hibern8 timeout to save power

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The PA_Hibern8Time and PA_TActivate time in most devices are well
under 1ms combined thereby the overall hibern8 enter/exit latencies
are under 1ms as well. Entering hibern8 as soon as possible saves
power consumption, hence reduce the auto hibern8 timeout to 1ms.

Change-Id: If58590fc397ec8eb88906c103247bb48710805db
Signed-off-by: Venkat Gopalakrishnan <venkatg@codeaurora.org>
This commit is contained in:
Venkat Gopalakrishnan 2016-10-04 10:01:31 -07:00
parent e9239e3f35
commit dfd06cdff2
1 changed files with 2 additions and 1 deletions
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3
drivers/scsi/ufs/ufshcd.c
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@ -1948,6 +1948,7 @@ static void ufshcd_init_hibern8_on_idle(struct ufs_hba *hba)
return; return;
if (ufshcd_is_auto_hibern8_supported(hba)) { if (ufshcd_is_auto_hibern8_supported(hba)) {
hba->hibern8_on_idle.delay_ms = 1;
hba->hibern8_on_idle.state = AUTO_HIBERN8; hba->hibern8_on_idle.state = AUTO_HIBERN8;
/* /*
* Disable SW hibern8 enter on idle in case * Disable SW hibern8 enter on idle in case
@ -1955,13 +1956,13 @@ static void ufshcd_init_hibern8_on_idle(struct ufs_hba *hba)
*/ */
hba->caps &= ~UFSHCD_CAP_HIBERN8_ENTER_ON_IDLE; hba->caps &= ~UFSHCD_CAP_HIBERN8_ENTER_ON_IDLE;
} else { } else {
hba->hibern8_on_idle.delay_ms = 10;
INIT_DELAYED_WORK(&hba->hibern8_on_idle.enter_work, INIT_DELAYED_WORK(&hba->hibern8_on_idle.enter_work,
ufshcd_hibern8_enter_work); ufshcd_hibern8_enter_work);
INIT_WORK(&hba->hibern8_on_idle.exit_work, INIT_WORK(&hba->hibern8_on_idle.exit_work,
ufshcd_hibern8_exit_work); ufshcd_hibern8_exit_work);
} }
hba->hibern8_on_idle.delay_ms = 10;
hba->hibern8_on_idle.is_enabled = true; hba->hibern8_on_idle.is_enabled = true;
hba->hibern8_on_idle.delay_attr.show = hba->hibern8_on_idle.delay_attr.show =