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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>
This commit is contained in:
Stanley Chu 2020-01-17 11:51:08 +08:00 committed by Martin K. Petersen
parent 9d19bf7ad1
commit fdb2c23249
1 changed files with 53 additions and 0 deletions
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53
drivers/scsi/ufs/ufs-mediatek.c
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@ -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;