[v2,2/3] phy: samsung-ufs: ufs: change phy on/off control

Commit Message

Chanho Park July 6, 2022, 2:02 a.m. UTC

The sequence of controlling ufs phy block should be below:

1) Power On
 - Turn off pmu isolation
 - Clock enable
2) Power Off
 - Clock disable
 - Turn on pmu isolation

Signed-off-by: Chanho Park <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
---
 drivers/phy/samsung/phy-samsung-ufs.c | 32 ++++++++++++++++-----------
 1 file changed, 19 insertions(+), 13 deletions(-)

Patch

diff --git a/drivers/phy/samsung/phy-samsung-ufs.c b/drivers/phy/samsung/phy-samsung-ufs.c
index 14cce2f2487e..183c88e3d1ec 100644
--- a/drivers/phy/samsung/phy-samsung-ufs.c
+++ b/drivers/phy/samsung/phy-samsung-ufs.c
@@ -151,37 +151,43 @@  static int samsung_ufs_phy_clks_init(struct samsung_ufs_phy *phy)
 static int samsung_ufs_phy_init(struct phy *phy)
 {
 	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);
-	int ret;
 
 	ss_phy->lane_cnt = phy->attrs.bus_width;
 	ss_phy->ufs_phy_state = CFG_PRE_INIT;
 
+	return 0;
+}
+
+static int samsung_ufs_phy_power_on(struct phy *phy)
+{
+	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);
+	int ret;
+
+	samsung_ufs_phy_ctrl_isol(ss_phy, false);
+
 	ret = clk_bulk_prepare_enable(ss_phy->drvdata->num_clks, ss_phy->clks);
 	if (ret) {
 		dev_err(ss_phy->dev, "failed to enable ufs phy clocks\n");
 		return ret;
 	}
 
-	ret = samsung_ufs_phy_calibrate(phy);
-	if (ret)
-		dev_err(ss_phy->dev, "ufs phy calibration failed\n");
+	if (ss_phy->ufs_phy_state == CFG_PRE_INIT) {
+		ret = samsung_ufs_phy_calibrate(phy);
+		if (ret)
+			dev_err(ss_phy->dev, "ufs phy calibration failed\n");
+	}
 
 	return ret;
 }
 
-static int samsung_ufs_phy_power_on(struct phy *phy)
-{
-	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);
-
-	samsung_ufs_phy_ctrl_isol(ss_phy, false);
-	return 0;
-}
-
 static int samsung_ufs_phy_power_off(struct phy *phy)
 {
 	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);
 
+	clk_bulk_disable_unprepare(ss_phy->drvdata->num_clks, ss_phy->clks);
+
 	samsung_ufs_phy_ctrl_isol(ss_phy, true);
+
 	return 0;
 }
 
@@ -202,7 +208,7 @@  static int samsung_ufs_phy_exit(struct phy *phy)
 {
 	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);
 
-	clk_bulk_disable_unprepare(ss_phy->drvdata->num_clks, ss_phy->clks);
+	ss_phy->ufs_phy_state = CFG_TAG_MAX;
 
 	return 0;
 }