[PATCH v4 09/14] phy: cadence: Sierra: Check for PLL lock during PHY power on

Kishon Vijay Abraham I
2019-12-16T09:56:39Z

Check for PLL lock during PHY power on.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.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 497c83827670..62bff4b043f0 100644
--- a/drivers/phy/cadence/phy-cadence-sierra.c
+++ b/drivers/phy/cadence/phy-cadence-sierra.c
@@ -55,6 +55,7 @@
#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
@@ -141,11 +142,14 @@

#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;
@@ -192,6 +196,7 @@ 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;
@@ -291,10 +296,25 @@ 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)
@@ -350,6 +370,7 @@ 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);
@@ -367,6 +388,16 @@ 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