[PATCH v4 08/10] scsi: ufs-mediatek: Support low-power mode for parents of VCCQx

Stanley Chu
2022-06-15T03:52:08Z

Provide the facility to configure parents of VCCQx power rails
as low-power or full-power mode in MediaTek UFS platforms.

Signed-off-by: Alice Chao <alice.chao@mediatek.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
drivers/ufs/host/ufs-mediatek.c | 46 +++++++++++++++++++++++----------
drivers/ufs/host/ufs-mediatek.h | 4 +++
2 files changed, 37 insertions(+), 13 deletions(-)

diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediatek.c
index 9c5d1213c290..e756aba45acd 100755
--- a/drivers/ufs/host/ufs-mediatek.c
+++ b/drivers/ufs/host/ufs-mediatek.c
@@ -1013,10 +1013,30 @@ 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)
+static void ufs_mtk_vccqx_set_lpm(struct ufs_hba *hba, bool lpm)
{
struct ufs_vreg *vccqx = NULL;

+ if (hba->vreg_info.vccq)
+ vccqx = hba->vreg_info.vccq;
+ else
+ vccqx = hba->vreg_info.vccq2;
+
+ regulator_set_mode(vccqx->reg,
+ lpm ? REGULATOR_MODE_IDLE : REGULATOR_MODE_NORMAL);
+}
+
+static void ufs_mtk_vsx_set_lpm(struct ufs_hba *hba, bool lpm)
+{
+ struct arm_smccc_res res;
+
+ ufs_mtk_device_pwr_ctrl(!lpm,
+ (unsigned long)hba->dev_info.wspecversion,
+ res);
+}
+
+static void ufs_mtk_dev_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
+{
if (!hba->vreg_info.vccq && !hba->vreg_info.vccq2)
return;

@@ -1032,13 +1052,13 @@ static void ufs_mtk_vreg_set_lpm(struct ufs_hba *hba, bool lpm)
if (lpm && hba->vreg_info.vcc->enabled)
return;

- if (hba->vreg_info.vccq)
- vccqx = hba->vreg_info.vccq;
- else
- vccqx = hba->vreg_info.vccq2;
-
- regulator_set_mode(vccqx->reg,
- lpm ? REGULATOR_MODE_IDLE : REGULATOR_MODE_NORMAL);
+ if (lpm) {
+ ufs_mtk_vccqx_set_lpm(hba, lpm);
+ ufs_mtk_vsx_set_lpm(hba, lpm);
+ } else {
+ ufs_mtk_vsx_set_lpm(hba, lpm);
+ ufs_mtk_vccqx_set_lpm(hba, lpm);
+ }
}

static void ufs_mtk_auto_hibern8_disable(struct ufs_hba *hba)
@@ -1105,7 +1125,7 @@ static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
int err;

if (hba->ufshcd_state != UFSHCD_STATE_OPERATIONAL)
- ufs_mtk_vreg_set_lpm(hba, false);
+ ufs_mtk_dev_vreg_set_lpm(hba, false);

err = ufs_mtk_mphy_power_on(hba, true);
if (err)
@@ -1284,7 +1304,7 @@ int ufs_mtk_system_suspend(struct device *dev)
if (ret)
return ret;

- ufs_mtk_vreg_set_lpm(hba, true);
+ ufs_mtk_dev_vreg_set_lpm(hba, true);

return 0;
}
@@ -1293,7 +1313,7 @@ int ufs_mtk_system_resume(struct device *dev)
{
struct ufs_hba *hba = dev_get_drvdata(dev);

- ufs_mtk_vreg_set_lpm(hba, false);
+ ufs_mtk_dev_vreg_set_lpm(hba, false);

return ufshcd_system_resume(dev);
}
@@ -1307,7 +1327,7 @@ int ufs_mtk_runtime_suspend(struct device *dev)
if (ret)
return ret;

- ufs_mtk_vreg_set_lpm(hba, true);
+ ufs_mtk_dev_vreg_set_lpm(hba, true);

return 0;
}
@@ -1316,7 +1336,7 @@ int ufs_mtk_runtime_resume(struct device *dev)
{
struct ufs_hba *hba = dev_get_drvdata(dev);

- ufs_mtk_vreg_set_lpm(hba, false);
+ ufs_mtk_dev_vreg_set_lpm(hba, false);

return ufshcd_runtime_resume(dev);
}
diff --git a/drivers/ufs/host/ufs-mediatek.h b/drivers/ufs/host/ufs-mediatek.h
index bf6ca96cafb6..5c6101ac518f 100755
--- a/drivers/ufs/host/ufs-mediatek.h
+++ b/drivers/ufs/host/ufs-mediatek.h
@@ -83,6 +83,7 @@ enum {
#define UFS_MTK_SIP_DEVICE_RESET BIT(1)
#define UFS_MTK_SIP_CRYPTO_CTRL BIT(2)
#define UFS_MTK_SIP_REF_CLK_NOTIFICATION BIT(3)
+#define UFS_MTK_SIP_DEVICE_PWR_CTRL BIT(7)

/*
* VS_DEBUGCLOCKENABLE
@@ -182,4 +183,7 @@ static void _ufs_mtk_smc(struct ufs_mtk_smc_arg s)
#define ufs_mtk_device_reset_ctrl(high, res) \
ufs_mtk_smc(UFS_MTK_SIP_DEVICE_RESET, &(res), high)

+#define ufs_mtk_device_pwr_ctrl(on, ufs_ver, res) \
+ ufs_mtk_smc(UFS_MTK_SIP_DEVICE_PWR_CTRL, &(res), on, ufs_ver)
+
#endif /* !_UFS_MEDIATEK_H */
--
2.18.0