ich777/linux_media
1
0
Fork 0
mirror of https://github.com/tbsdtv/linux_media.git synced 2025-07-23 12:43:29 +02:00
Code Issues Packages Projects Releases Wiki Activity

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

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/scsi/ufs/ufs-mediatek.c
View File

@@ -12,6 +12,7 @@
#include <linux/of_address.h> #include <linux/of_address.h>
#include <linux/phy/phy.h> #include <linux/phy/phy.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/soc/mediatek/mtk_sip_svc.h> #include <linux/soc/mediatek/mtk_sip_svc.h>
#include "ufshcd.h" #include "ufshcd.h"
@@ -521,6 +522,19 @@ static int ufs_mtk_link_set_lpm(struct ufs_hba *hba)
return 0; 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) static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
{ {
int err; 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); ufshcd_set_link_off(hba);
return -EAGAIN; 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)) 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); phy_power_on(host->mphy);
if (ufshcd_is_link_hibern8(hba)) { if (ufshcd_is_link_hibern8(hba)) {
ufs_mtk_vreg_set_lpm(hba, false);
err = ufs_mtk_link_set_hpm(hba); err = ufs_mtk_link_set_hpm(hba);
if (err) { if (err) {
err = ufshcd_link_recovery(hba); err = ufshcd_link_recovery(hba);