diff options
| author |   Stanley Chu <stanley.chu@mediatek.com> | 2020-01-17 11:51:08 +0800 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2020-01-20 19:09:58 -0500 |
| commit | fdb2c232497296025c27e47d379fe55ba46ff9e6 (patch) | |
| tree | 196ed37c2f8ddf4d9713a09dedc355386ed1d428 /drivers/scsi | |
| parent | scsi: ufs: export some functions for vendor usage (diff) | |
| download | linux-dev-fdb2c232497296025c27e47d379fe55ba46ff9e6.tar.xz linux-dev-fdb2c232497296025c27e47d379fe55ba46ff9e6.zip | |
scsi: ufs-mediatek: enable low-power mode for hibern8 state
In MediaTek Chipsets, UniPro link and ufshci can enter proprietary
low-power mode while link is in hibern8 state.
Link: https://lore.kernel.org/r/20200117035108.19699-4-stanley.chu@mediatek.com
Reviewed-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/ufs/ufs-mediatek.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c index d5194d0c4ef5..f32f3f34f6d0 100644 --- a/drivers/scsi/ufs/ufs-mediatek.c +++ b/drivers/scsi/ufs/ufs-mediatek.c @@ -382,11 +382,60 @@ static void ufs_mtk_device_reset(struct ufs_hba *hba) dev_info(hba->dev, "device reset done\n"); } +static int ufs_mtk_link_set_hpm(struct ufs_hba *hba) +{ + int err; + + err = ufshcd_hba_enable(hba); + if (err) + return err; + + err = ufshcd_dme_set(hba, + UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0), + 0); + if (err) + return err; + + err = ufshcd_uic_hibern8_exit(hba); + if (!err) + ufshcd_set_link_active(hba); + else + return err; + + err = ufshcd_make_hba_operational(hba); + if (err) + return err; + + return 0; +} + +static int ufs_mtk_link_set_lpm(struct ufs_hba *hba) +{ + int err; + + err = ufshcd_dme_set(hba, + UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0), + 1); + if (err) { + /* Resume UniPro state for following error recovery */ + ufshcd_dme_set(hba, + UIC_ARG_MIB_SEL(VS_UNIPROPOWERDOWNCONTROL, 0), + 0); + return err; + } + + return 0; +} + static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) { + int err; struct ufs_mtk_host *host = ufshcd_get_variant(hba); if (ufshcd_is_link_hibern8(hba)) { + err = ufs_mtk_link_set_lpm(hba); + if (err) + return -EAGAIN; phy_power_off(host->mphy); ufs_mtk_setup_ref_clk(hba, false); } @@ -397,10 +446,14 @@ static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op) static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op) { struct ufs_mtk_host *host = ufshcd_get_variant(hba); + int err; if (ufshcd_is_link_hibern8(hba)) { ufs_mtk_setup_ref_clk(hba, true); phy_power_on(host->mphy); + err = ufs_mtk_link_set_hpm(hba); + if (err) + return err; } return 0; |