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Message-Id: <1587662818-4461-1-git-send-email-wcheng@codeaurora.org>
Date: Thu, 23 Apr 2020 10:26:58 -0700
From: Wesley Cheng <wcheng@...eaurora.org>
To: agross@...nel.org, bjorn.andersson@...aro.org, kishon@...com
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
Wesley Cheng <wcheng@...eaurora.org>
Subject: [PATCH] phy: qcom-snps: Add runtime suspend and resume handlers
Allow for the PHY to be put into a powered down state when possible.
Add the required suspend and resume callbacks, which will determine
what resources can be turned off depending on the cable status.
Signed-off-by: Wesley Cheng <wcheng@...eaurora.org>
---
Depends-on: phy: qcom-snps: Add SNPS USB PHY driver for QCOM based SOCs
(https://patchwork.kernel.org/patch/11486171/)
---
drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c | 93 +++++++++++++++++++++++++++
1 file changed, 93 insertions(+)
diff --git a/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c b/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c
index 20442a3..f48d877 100644
--- a/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c
+++ b/drivers/phy/qualcomm/phy-qcom-snps-femto-v2.c
@@ -76,7 +76,9 @@
* @iface_clk: phy interface clock
* @phy_reset: phy reset control
* @vregs: regulator supplies bulk data
+ * @suspended: PHY is in the suspended state
* @phy_initialized: if PHY has been initialized correctly
+ * @mode: contains the current mode the PHY is in
*/
struct qcom_snps_hsphy {
struct phy *phy;
@@ -87,7 +89,9 @@ struct qcom_snps_hsphy {
struct reset_control *phy_reset;
struct regulator_bulk_data vregs[SNPS_HS_NUM_VREGS];
+ bool suspended;
bool phy_initialized;
+ enum phy_mode mode;
};
static inline void qcom_snps_hsphy_write_mask(void __iomem *base, u32 offset,
@@ -104,6 +108,77 @@ static inline void qcom_snps_hsphy_write_mask(void __iomem *base, u32 offset,
readl_relaxed(base + offset);
}
+static int qcom_snps_hsphy_suspend(struct qcom_snps_hsphy *hsphy)
+{
+ if (hsphy->suspended)
+ return 0;
+
+ dev_dbg(&hsphy->phy->dev, "Suspend QCOM SNPS PHY, mode = %d \n", hsphy->mode);
+
+ if (hsphy->mode == PHY_MODE_USB_HOST) {
+ /* Enable auto-resume to meet remote wakeup timing */
+ qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_HS_PHY_CTRL2,
+ USB2_AUTO_RESUME, USB2_AUTO_RESUME);
+ usleep_range(500, 1000);
+ qcom_snps_hsphy_write_mask(hsphy->base, USB2_PHY_USB_PHY_HS_PHY_CTRL2,
+ 0, USB2_AUTO_RESUME);
+ }
+
+ clk_disable_unprepare(hsphy->cfg_ahb_clk);
+ hsphy->suspended = true;
+
+ return 0;
+}
+
+static int qcom_snps_hsphy_resume(struct qcom_snps_hsphy *hsphy)
+{
+ int ret = 0;
+
+ if (!hsphy->suspended)
+ return 0;
+
+ dev_dbg(&hsphy->phy->dev, "Resume QCOM SNPS PHY, mode = %d \n", hsphy->mode);
+
+ ret = clk_prepare_enable(hsphy->cfg_ahb_clk);
+ if (ret) {
+ dev_err(&hsphy->phy->dev, "failed to enable cfg ahb clock, %d\n", ret);
+ return ret;
+ }
+
+ hsphy->suspended = false;
+ return 0;
+}
+
+static int __maybe_unused qcom_snps_hsphy_runtime_suspend(struct device *dev)
+{
+ struct qcom_snps_hsphy *hsphy = dev_get_drvdata(dev);
+
+ if (!hsphy->phy_initialized)
+ return 0;
+
+ qcom_snps_hsphy_suspend(hsphy);
+ return 0;
+}
+
+static int __maybe_unused qcom_snps_hsphy_runtime_resume(struct device *dev)
+{
+ struct qcom_snps_hsphy *hsphy = dev_get_drvdata(dev);
+
+ if (!hsphy->phy_initialized)
+ return 0;
+
+ qcom_snps_hsphy_resume(hsphy);
+ return 0;
+}
+
+static int qcom_snps_hsphy_set_mode(struct phy *phy, enum phy_mode mode, int submode)
+{
+ struct qcom_snps_hsphy *hsphy = phy_get_drvdata(phy);
+
+ hsphy->mode = mode;
+ return 0;
+}
+
static int qcom_snps_hsphy_init(struct phy *phy)
{
struct qcom_snps_hsphy *hsphy = phy_get_drvdata(phy);
@@ -171,6 +246,7 @@ static int qcom_snps_hsphy_init(struct phy *phy)
UTMI_PHY_CMN_CTRL_OVERRIDE_EN, 0);
hsphy->phy_initialized = true;
+ hsphy->suspended = false;
return 0;
@@ -197,6 +273,7 @@ static int qcom_snps_hsphy_exit(struct phy *phy)
static const struct phy_ops qcom_snps_hsphy_gen_ops = {
.init = qcom_snps_hsphy_init,
.exit = qcom_snps_hsphy_exit,
+ .set_mode = qcom_snps_hsphy_set_mode,
.owner = THIS_MODULE,
};
@@ -208,6 +285,11 @@ static int qcom_snps_hsphy_exit(struct phy *phy)
};
MODULE_DEVICE_TABLE(of, qcom_snps_hsphy_of_match_table);
+static const struct dev_pm_ops qcom_snps_hsphy_pm_ops = {
+ SET_RUNTIME_PM_OPS(qcom_snps_hsphy_runtime_suspend,
+ qcom_snps_hsphy_runtime_resume, NULL)
+};
+
static int qcom_snps_hsphy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -251,6 +333,14 @@ static int qcom_snps_hsphy_probe(struct platform_device *pdev)
return ret;
}
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ /*
+ * Prevent runtime pm from being ON by default. Users can enable
+ * it using power/control in sysfs.
+ */
+ pm_runtime_forbid(dev);
+
generic_phy = devm_phy_create(dev, NULL, &qcom_snps_hsphy_gen_ops);
if (IS_ERR(generic_phy)) {
ret = PTR_ERR(generic_phy);
@@ -265,6 +355,8 @@ static int qcom_snps_hsphy_probe(struct platform_device *pdev)
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
if (!IS_ERR(phy_provider))
dev_dbg(dev, "Registered Qcom-SNPS HS phy\n");
+ else
+ pm_runtime_disable(dev);
return PTR_ERR_OR_ZERO(phy_provider);
}
@@ -273,6 +365,7 @@ static int qcom_snps_hsphy_probe(struct platform_device *pdev)
.probe = qcom_snps_hsphy_probe,
.driver = {
.name = "qcom-snps-hs-femto-v2-phy",
+ .pm = &qcom_snps_hsphy_pm_ops,
.of_match_table = qcom_snps_hsphy_of_match_table,
},
};
--
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