phy: samsung: gs101-ufs: Add .notify_phystate() & hibern8 enter/exit values

Implement the .notify_phystate() callback and provide the gs101 specific
phy values that need to be programmed when entering and exiting the hibern8
state.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20251112-phy-notify-pmstate-v5-2-39df622d8fcb@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: petegriffin

drivers/phy/samsung/phy-gs101-ufs.c

@@ -108,12 +108,39 @@ static const struct samsung_ufs_phy_cfg tensor_gs101_post_pwr_hs_config[] = {
 	END_UFS_PHY_CFG,
 };
 
+static const struct samsung_ufs_phy_cfg tensor_gs101_post_h8_enter[] = {
+	PHY_TRSV_REG_CFG_GS101(0x262, 0x08, PWR_MODE_ANY),
+	PHY_TRSV_REG_CFG_GS101(0x265, 0x0A, PWR_MODE_ANY),
+	PHY_COMN_REG_CFG(0x1, 0x8,  PWR_MODE_ANY),
+	PHY_COMN_REG_CFG(0x0, 0x86,  PWR_MODE_ANY),
+	PHY_COMN_REG_CFG(0x8, 0x60,  PWR_MODE_HS_ANY),
+	PHY_TRSV_REG_CFG_GS101(0x222, 0x08, PWR_MODE_HS_ANY),
+	PHY_TRSV_REG_CFG_GS101(0x246, 0x01, PWR_MODE_HS_ANY),
+	END_UFS_PHY_CFG,
+};
+
+static const struct samsung_ufs_phy_cfg tensor_gs101_pre_h8_exit[] = {
+	PHY_COMN_REG_CFG(0x0, 0xC6,  PWR_MODE_ANY),
+	PHY_COMN_REG_CFG(0x1, 0x0C,  PWR_MODE_ANY),
+	PHY_TRSV_REG_CFG_GS101(0x262, 0x00, PWR_MODE_ANY),
+	PHY_TRSV_REG_CFG_GS101(0x265, 0x00, PWR_MODE_ANY),
+	PHY_COMN_REG_CFG(0x8, 0xE0,  PWR_MODE_HS_ANY),
+	PHY_TRSV_REG_CFG_GS101(0x246, 0x03, PWR_MODE_HS_ANY),
+	PHY_TRSV_REG_CFG_GS101(0x222, 0x18, PWR_MODE_HS_ANY),
+	END_UFS_PHY_CFG,
+};
+
 static const struct samsung_ufs_phy_cfg *tensor_gs101_ufs_phy_cfgs[CFG_TAG_MAX] = {
 	[CFG_PRE_INIT]		= tensor_gs101_pre_init_cfg,
 	[CFG_PRE_PWR_HS]	= tensor_gs101_pre_pwr_hs_config,
 	[CFG_POST_PWR_HS]	= tensor_gs101_post_pwr_hs_config,
 };
 
+static const struct samsung_ufs_phy_cfg *tensor_gs101_hibern8_cfgs[] = {
+	[CFG_POST_HIBERN8_ENTER]	= tensor_gs101_post_h8_enter,
+	[CFG_PRE_HIBERN8_EXIT]		= tensor_gs101_pre_h8_exit,
+};
+
 static const char * const tensor_gs101_ufs_phy_clks[] = {
 	"ref_clk",
 };
@@ -170,6 +197,7 @@ static int gs101_phy_wait_for_cdr_lock(struct phy *phy, u8 lane)
 
 const struct samsung_ufs_phy_drvdata tensor_gs101_ufs_phy = {
 	.cfgs = tensor_gs101_ufs_phy_cfgs,
+	.cfgs_hibern8 = tensor_gs101_hibern8_cfgs,
 	.isol = {
 		.offset = TENSOR_GS101_PHY_CTRL,
 		.mask = TENSOR_GS101_PHY_CTRL_MASK,

drivers/phy/samsung/phy-samsung-ufs.c

@@ -217,6 +217,44 @@ static int samsung_ufs_phy_set_mode(struct phy *generic_phy,
 	return 0;
 }
 
+static int samsung_ufs_phy_notify_state(struct phy *phy,
+					union phy_notify state)
+{
+	struct samsung_ufs_phy *ufs_phy = get_samsung_ufs_phy(phy);
+	const struct samsung_ufs_phy_cfg *cfg;
+	int i, err = -EINVAL;
+
+	if (!ufs_phy->cfgs_hibern8)
+		return 0;
+
+	if (state.ufs_state == PHY_UFS_HIBERN8_ENTER)
+		cfg = ufs_phy->cfgs_hibern8[CFG_POST_HIBERN8_ENTER];
+	else if (state.ufs_state == PHY_UFS_HIBERN8_EXIT)
+		cfg = ufs_phy->cfgs_hibern8[CFG_PRE_HIBERN8_EXIT];
+	else
+		goto err_out;
+
+	for_each_phy_cfg(cfg) {
+		for_each_phy_lane(ufs_phy, i) {
+			samsung_ufs_phy_config(ufs_phy, cfg, i);
+		}
+	}
+
+	if (state.ufs_state == PHY_UFS_HIBERN8_EXIT) {
+		for_each_phy_lane(ufs_phy, i) {
+			if (ufs_phy->drvdata->wait_for_cdr) {
+				err = ufs_phy->drvdata->wait_for_cdr(phy, i);
+				if (err)
+					goto err_out;
+			}
+		}
+	}
+
+	return 0;
+err_out:
+	return err;
+}
+
 static int samsung_ufs_phy_exit(struct phy *phy)
 {
 	struct samsung_ufs_phy *ss_phy = get_samsung_ufs_phy(phy);
@@ -233,6 +271,7 @@ static const struct phy_ops samsung_ufs_phy_ops = {
 	.power_off	= samsung_ufs_phy_power_off,
 	.calibrate	= samsung_ufs_phy_calibrate,
 	.set_mode	= samsung_ufs_phy_set_mode,
+	.notify_phystate = samsung_ufs_phy_notify_state,
 	.owner          = THIS_MODULE,
 };
 
@@ -287,6 +326,7 @@ static int samsung_ufs_phy_probe(struct platform_device *pdev)
 	phy->dev = dev;
 	phy->drvdata = drvdata;
 	phy->cfgs = drvdata->cfgs;
+	phy->cfgs_hibern8 = drvdata->cfgs_hibern8;
 	memcpy(&phy->isol, &drvdata->isol, sizeof(phy->isol));
 
 	if (!of_property_read_u32_index(dev->of_node, "samsung,pmu-syscon", 1,

drivers/phy/samsung/phy-samsung-ufs.h

@@ -92,6 +92,11 @@ enum {
 	CFG_TAG_MAX,
 };
 
+enum {
+	CFG_POST_HIBERN8_ENTER,
+	CFG_PRE_HIBERN8_EXIT,
+};
+
 struct samsung_ufs_phy_cfg {
 	u32 off_0;
 	u32 off_1;
@@ -108,6 +113,7 @@ struct samsung_ufs_phy_pmu_isol {
 
 struct samsung_ufs_phy_drvdata {
 	const struct samsung_ufs_phy_cfg **cfgs;
+	const struct samsung_ufs_phy_cfg **cfgs_hibern8;
 	struct samsung_ufs_phy_pmu_isol isol;
 	const char * const *clk_list;
 	int num_clks;
@@ -124,6 +130,7 @@ struct samsung_ufs_phy {
 	struct clk_bulk_data *clks;
 	const struct samsung_ufs_phy_drvdata *drvdata;
 	const struct samsung_ufs_phy_cfg * const *cfgs;
+	const struct samsung_ufs_phy_cfg * const *cfgs_hibern8;
 	struct samsung_ufs_phy_pmu_isol isol;
 	u8 lane_cnt;
 	int ufs_phy_state;