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Date: Fri, 21 Jul 2017 16:31:57 +0530
From: Manu Gautam <mgautam@...eaurora.org>
To: Kishon Vijay Abraham I <kishon@...com>,
Felipe Balbi <balbi@...nel.org>
Cc: linux-arm-msm@...r.kernel.org,
Manu Gautam <mgautam@...eaurora.org>,
Vivek Gautam <vivek.gautam@...eaurora.org>,
Jaehoon Chung <jh80.chung@...sung.com>,
Wei Yongjun <weiyongjun1@...wei.com>,
Fengguang Wu <fengguang.wu@...el.com>,
linux-kernel@...r.kernel.org (open list:GENERIC PHY FRAMEWORK)
Subject: [PATCH v1 2/6] phy: qcom-qmp: Power-on PHY before initialization
PHY must be powered on before turning ON clocks and
attempting to initialize it. Driver is exposing
separate init and power_on routines for this.
Apparently USB dwc3 core driver performs power-on
after init. Also, poweron and init for QMP PHY
need to be executed together always, hence remove
poweron callback from phy_ops and explicitly perform
this from init, similar changes needed for poweroff.
Signed-off-by: Manu Gautam <mgautam@...eaurora.org>
diff --git a/drivers/phy/qualcomm/phy-qcom-qmp.c b/drivers/phy/qualcomm/phy-qcom-qmp.c
index a230c7b..aefb853 100644
--- a/drivers/phy/qualcomm/phy-qcom-qmp.c
+++ b/drivers/phy/qualcomm/phy-qcom-qmp.c
@@ -479,6 +479,8 @@ struct qcom_qmp {
struct mutex phy_mutex;
int init_count;
+ bool power_enabled;
+ bool clk_enabled;
};
static inline void qphy_setbits(void __iomem *base, u32 offset, u32 val)
@@ -599,29 +601,69 @@ static void qcom_qmp_phy_configure(void __iomem *base,
}
}
-static int qcom_qmp_phy_poweron(struct phy *phy)
+static int qcom_qmp_phy_poweron(struct qcom_qmp *qmp)
{
- struct qmp_phy *qphy = phy_get_drvdata(phy);
- struct qcom_qmp *qmp = qphy->qmp;
int num = qmp->cfg->num_vregs;
int ret;
- dev_vdbg(&phy->dev, "Powering on QMP phy\n");
+ dev_vdbg(qmp->dev, "Powering on QMP phy\n");
+
+ if (qmp->power_enabled)
+ return 0;
/* turn on regulator supplies */
ret = regulator_bulk_enable(num, qmp->vregs);
if (ret)
dev_err(qmp->dev, "failed to enable regulators, err=%d\n", ret);
+ else
+ qmp->power_enabled = true;
return ret;
}
-static int qcom_qmp_phy_poweroff(struct phy *phy)
+static int qcom_qmp_phy_poweroff(struct qcom_qmp *qmp)
{
- struct qmp_phy *qphy = phy_get_drvdata(phy);
- struct qcom_qmp *qmp = qphy->qmp;
+ if (!qmp->power_enabled)
+ return 0;
regulator_bulk_disable(qmp->cfg->num_vregs, qmp->vregs);
+ qmp->power_enabled = false;
+
+ return 0;
+}
+
+static int qcom_qmp_phy_enable_clocks(struct qcom_qmp *qmp)
+{
+ int ret = 0, i;
+
+ if (qmp->clk_enabled)
+ return 0;
+
+ for (i = 0; i < qmp->cfg->num_clks; i++) {
+ ret = clk_prepare_enable(qmp->clks[i]);
+ if (ret) {
+ dev_err(qmp->dev, "failed to enable %s clk, err=%d\n",
+ qmp->cfg->clk_list[i], ret);
+ while (--i >= 0)
+ clk_disable_unprepare(qmp->clks[i]);
+ }
+ }
+ qmp->clk_enabled = true;
+
+ return ret;
+}
+
+static int qcom_qmp_phy_disable_clocks(struct qcom_qmp *qmp)
+{
+ int i = qmp->cfg->num_clks;
+
+ if (!qmp->clk_enabled)
+ return 0;
+
+ while (--i >= 0)
+ clk_disable_unprepare(qmp->clks[i]);
+
+ qmp->clk_enabled = false;
return 0;
}
@@ -729,19 +771,17 @@ static int qcom_qmp_phy_init(struct phy *phy)
void __iomem *pcs = qphy->pcs;
void __iomem *status;
unsigned int mask, val;
- int ret, i;
+ int ret;
dev_vdbg(qmp->dev, "Initializing QMP phy\n");
- for (i = 0; i < qmp->cfg->num_clks; i++) {
- ret = clk_prepare_enable(qmp->clks[i]);
- if (ret) {
- dev_err(qmp->dev, "failed to enable %s clk, err=%d\n",
- qmp->cfg->clk_list[i], ret);
- while (--i >= 0)
- clk_disable_unprepare(qmp->clks[i]);
- }
- }
+ ret = qcom_qmp_phy_poweron(qmp);
+ if (ret)
+ return ret;
+
+ ret = qcom_qmp_phy_enable_clocks(qmp);
+ if (ret)
+ goto err_clk_enable;
ret = qcom_qmp_phy_com_init(qmp);
if (ret)
@@ -801,8 +841,9 @@ static int qcom_qmp_phy_init(struct phy *phy)
err_lane_rst:
qcom_qmp_phy_com_exit(qmp);
err_com_init:
- while (--i >= 0)
- clk_disable_unprepare(qmp->clks[i]);
+ qcom_qmp_phy_disable_clocks(qmp);
+err_clk_enable:
+ qcom_qmp_phy_poweroff(qmp);
return ret;
}
@@ -812,7 +853,6 @@ static int qcom_qmp_phy_exit(struct phy *phy)
struct qmp_phy *qphy = phy_get_drvdata(phy);
struct qcom_qmp *qmp = qphy->qmp;
const struct qmp_phy_cfg *cfg = qmp->cfg;
- int i = cfg->num_clks;
clk_disable_unprepare(qphy->pipe_clk);
@@ -830,8 +870,9 @@ static int qcom_qmp_phy_exit(struct phy *phy)
qcom_qmp_phy_com_exit(qmp);
- while (--i >= 0)
- clk_disable_unprepare(qmp->clks[i]);
+ qcom_qmp_phy_disable_clocks(qmp);
+
+ qcom_qmp_phy_poweroff(qmp);
return 0;
}
@@ -958,8 +999,6 @@ static int phy_pipe_clk_register(struct qcom_qmp *qmp, int id)
static const struct phy_ops qcom_qmp_phy_gen_ops = {
.init = qcom_qmp_phy_init,
.exit = qcom_qmp_phy_exit,
- .power_on = qcom_qmp_phy_poweron,
- .power_off = qcom_qmp_phy_poweroff,
.owner = THIS_MODULE,
};
--
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