linux-kernel - [PATCH 09/13] phy: cadence: Sierra: Check for PLL lock during PHY power on

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Message-ID: <20191016113117.12370-10-kishon@ti.com>
Date:   Wed, 16 Oct 2019 17:01:13 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Roger Quadros <rogerq@...com>, Jyri Sarha <jsarha@...com>
CC:     Anil Varughese <aniljoy@...ence.com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH 09/13] phy: cadence: Sierra: Check for PLL lock during PHY power on

Check for PLL lock during PHY power on.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/phy/cadence/phy-cadence-sierra.c | 33 +++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/cadence/phy-cadence-sierra.c b/drivers/phy/cadence/phy-cadence-sierra.c
index 2648a01f90b3..82f7617b2dac 100644
--- a/drivers/phy/cadence/phy-cadence-sierra.c
+++ b/drivers/phy/cadence/phy-cadence-sierra.c
@@ -54,6 +54,7 @@
 #define SIERRA_PLLCTRL_SUBRATE_PREG			0x03A
 #define SIERRA_PLLCTRL_GEN_D_PREG			0x03E
 #define SIERRA_PLLCTRL_CPGAIN_MODE_PREG			0x03F
+#define SIERRA_PLLCTRL_STATUS_PREG			0x044
 #define SIERRA_CLKPATH_BIASTRIM_PREG			0x04B
 #define SIERRA_DFE_BIASTRIM_PREG			0x04C
 #define SIERRA_DRVCTRL_ATTEN_PREG			0x06A
@@ -139,11 +140,14 @@
 
 #define SIERRA_MACRO_ID					0x00007364
 #define SIERRA_MAX_LANES				4
+#define PLL_LOCK_TIME					100000
 
 static const struct reg_field macro_id_type =
 				REG_FIELD(SIERRA_MACRO_ID_REG, 0, 15);
 static const struct reg_field phy_pll_cfg_1 =
 				REG_FIELD(SIERRA_PHY_PLL_CFG, 1, 1);
+static const struct reg_field pllctrl_lock =
+				REG_FIELD(SIERRA_PLLCTRL_STATUS_PREG, 0, 0);
 
 struct cdns_sierra_inst {
 	struct phy *phy;
@@ -190,6 +194,7 @@ struct cdns_sierra_phy {
 	struct regmap *regmap_common_cdb;
 	struct regmap_field *macro_id_type;
 	struct regmap_field *phy_pll_cfg_1;
+	struct regmap_field *pllctrl_lock[SIERRA_MAX_LANES];
 	struct clk *clk;
 	int nsubnodes;
 	bool autoconf;
@@ -289,10 +294,25 @@ static int cdns_sierra_phy_init(struct phy *gphy)
 
 static int cdns_sierra_phy_on(struct phy *gphy)
 {
+	struct cdns_sierra_phy *sp = dev_get_drvdata(gphy->dev.parent);
 	struct cdns_sierra_inst *ins = phy_get_drvdata(gphy);
+	struct device *dev = sp->dev;
+	u32 val;
+	int ret;
 
 	/* Take the PHY lane group out of reset */
-	return reset_control_deassert(ins->lnk_rst);
+	ret = reset_control_deassert(ins->lnk_rst);
+	if (ret) {
+		dev_err(dev, "Failed to take the PHY lane out of reset\n");
+		return ret;
+	}
+
+	ret = regmap_field_read_poll_timeout(sp->pllctrl_lock[ins->mlane],
+					     val, val, 1000, PLL_LOCK_TIME);
+	if (ret < 0)
+		dev_err(dev, "PLL lock of lane failed\n");
+
+	return ret;
 }
 
 static int cdns_sierra_phy_off(struct phy *gphy)
@@ -349,6 +369,7 @@ static int cdns_regfield_init(struct cdns_sierra_phy *sp)
 	struct device *dev = sp->dev;
 	struct regmap_field *field;
 	struct regmap *regmap;
+	int i;
 
 	regmap = sp->regmap_common_cdb;
 	field = devm_regmap_field_alloc(dev, regmap, macro_id_type);
@@ -366,6 +387,16 @@ static int cdns_regfield_init(struct cdns_sierra_phy *sp)
 	}
 	sp->phy_pll_cfg_1 = field;
 
+	for (i = 0; i < SIERRA_MAX_LANES; i++) {
+		regmap = sp->regmap_lane_cdb[i];
+		field = devm_regmap_field_alloc(dev, regmap, pllctrl_lock);
+		if (IS_ERR(field)) {
+			dev_err(dev, "P%d_ENABLE reg field init failed\n", i);
+			return PTR_ERR(field);
+		}
+		sp->pllctrl_lock[i] =  field;
+	}
+
 	return 0;
 }
 
-- 
2.17.1