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scsi: ufs-mediatek: Introduce low-power mode for device power supply 

Allow device power supply to enter low-power mode.

Link: https://lore.kernel.org/r/20200601104646.15436-4-stanley.chu@mediatek.com
Reviewed-by: Pengshun Zhao <pengshun.zhao@mediatek.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Stanley Chu 2020-06-01 18:46:44 +08:00 committed by Martin K. Petersen
parent 9006e3986f
commit 488edafb11
1 changed files with 21 additions and 0 deletions
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21
drivers/scsi/ufs/ufs-mediatek.c
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@ -12,6 +12,7 @@
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/soc/mediatek/mtk_sip_svc.h>
#include "ufshcd.h"
@ -521,6 +522,19 @@ static int ufs_mtk_link_set_lpm(struct ufs_hba *hba)
return 0;
}
static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
{
if (!hba->vreg_info.vccq2)
return;
if (lpm & !hba->vreg_info.vcc->enabled)
regulator_set_mode(hba->vreg_info.vccq2->reg,
REGULATOR_MODE_IDLE);
else if (!lpm)
regulator_set_mode(hba->vreg_info.vccq2->reg,
REGULATOR_MODE_NORMAL);
}
static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{
int err;
@ -537,6 +551,12 @@ static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
ufshcd_set_link_off(hba);
return -EAGAIN;
}
/*
* Make sure no error will be returned to prevent
* ufshcd_suspend() re-enabling regulators while vreg is still
* in low-power mode.
*/
ufs_mtk_vreg_set_lpm(hba, true);
}
if (!ufshcd_is_link_active(hba))
@ -554,6 +574,7 @@ static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
phy_power_on(host->mphy);
if (ufshcd_is_link_hibern8(hba)) {
ufs_mtk_vreg_set_lpm(hba, false);
err = ufs_mtk_link_set_hpm(hba);
if (err) {
err = ufshcd_link_recovery(hba);