| Message ID | 20240726113207.3393247-1-xu.yang_2@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2,1/6] usb: phy: mxs: enable regulator phy-3p0 to improve signal qualilty | expand |
On 24-07-26 19:32:02, Xu Yang wrote: > Enable regulator 'phy-3p0' to pass eye diagram test since it improve signal > qualilty. > > Signed-off-by: Xu Yang <xu.yang_2@nxp.com> Reviewed-by: Peter Chen <peter.chen@kernel.org> > > --- > Changes in v2: > - rewrite commit message > - use dev_err_probe() as suggested by Frank Li > --- > drivers/usb/phy/phy-mxs-usb.c | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c > index 920a32cd094d..d9d29f0b37de 100644 > --- a/drivers/usb/phy/phy-mxs-usb.c > +++ b/drivers/usb/phy/phy-mxs-usb.c > @@ -18,6 +18,7 @@ > #include <linux/regmap.h> > #include <linux/mfd/syscon.h> > #include <linux/iopoll.h> > +#include <linux/regulator/consumer.h> > > #define DRIVER_NAME "mxs_phy" > > @@ -204,6 +205,7 @@ struct mxs_phy { > int port_id; > u32 tx_reg_set; > u32 tx_reg_mask; > + struct regulator *phy_3p0; > }; > > static inline bool is_imx6q_phy(struct mxs_phy *mxs_phy) > @@ -288,6 +290,16 @@ static int mxs_phy_hw_init(struct mxs_phy *mxs_phy) > if (ret) > goto disable_pll; > > + if (mxs_phy->phy_3p0) { > + ret = regulator_enable(mxs_phy->phy_3p0); > + if (ret) { > + dev_err(mxs_phy->phy.dev, > + "Failed to enable 3p0 regulator, ret=%d\n", > + ret); > + return ret; > + } > + } > + > /* Power up the PHY */ > writel(0, base + HW_USBPHY_PWD); > > @@ -448,6 +460,9 @@ static void mxs_phy_shutdown(struct usb_phy *phy) > if (is_imx7ulp_phy(mxs_phy)) > mxs_phy_pll_enable(phy->io_priv, false); > > + if (mxs_phy->phy_3p0) > + regulator_disable(mxs_phy->phy_3p0); > + > clk_disable_unprepare(mxs_phy->clk); > } > > @@ -789,6 +804,17 @@ static int mxs_phy_probe(struct platform_device *pdev) > mxs_phy->clk = clk; > mxs_phy->data = of_device_get_match_data(&pdev->dev); > > + mxs_phy->phy_3p0 = devm_regulator_get(&pdev->dev, "phy-3p0"); > + if (PTR_ERR(mxs_phy->phy_3p0) == -ENODEV) > + /* not exist */ > + mxs_phy->phy_3p0 = NULL; > + else if (IS_ERR(mxs_phy->phy_3p0)) > + return dev_err_probe(&pdev->dev, PTR_ERR(mxs_phy->phy_3p0), > + "Getting regulator error\n"); > + > + if (mxs_phy->phy_3p0) > + regulator_set_voltage(mxs_phy->phy_3p0, 3200000, 3200000); > + > platform_set_drvdata(pdev, mxs_phy); > > device_set_wakeup_capable(&pdev->dev, true); > -- > 2.34.1 >
diff --git a/drivers/usb/phy/phy-mxs-usb.c b/drivers/usb/phy/phy-mxs-usb.c index 920a32cd094d..d9d29f0b37de 100644 --- a/drivers/usb/phy/phy-mxs-usb.c +++ b/drivers/usb/phy/phy-mxs-usb.c @@ -18,6 +18,7 @@ #include <linux/regmap.h> #include <linux/mfd/syscon.h> #include <linux/iopoll.h> +#include <linux/regulator/consumer.h> #define DRIVER_NAME "mxs_phy" @@ -204,6 +205,7 @@ struct mxs_phy { int port_id; u32 tx_reg_set; u32 tx_reg_mask; + struct regulator *phy_3p0; }; static inline bool is_imx6q_phy(struct mxs_phy *mxs_phy) @@ -288,6 +290,16 @@ static int mxs_phy_hw_init(struct mxs_phy *mxs_phy) if (ret) goto disable_pll; + if (mxs_phy->phy_3p0) { + ret = regulator_enable(mxs_phy->phy_3p0); + if (ret) { + dev_err(mxs_phy->phy.dev, + "Failed to enable 3p0 regulator, ret=%d\n", + ret); + return ret; + } + } + /* Power up the PHY */ writel(0, base + HW_USBPHY_PWD); @@ -448,6 +460,9 @@ static void mxs_phy_shutdown(struct usb_phy *phy) if (is_imx7ulp_phy(mxs_phy)) mxs_phy_pll_enable(phy->io_priv, false); + if (mxs_phy->phy_3p0) + regulator_disable(mxs_phy->phy_3p0); + clk_disable_unprepare(mxs_phy->clk); } @@ -789,6 +804,17 @@ static int mxs_phy_probe(struct platform_device *pdev) mxs_phy->clk = clk; mxs_phy->data = of_device_get_match_data(&pdev->dev); + mxs_phy->phy_3p0 = devm_regulator_get(&pdev->dev, "phy-3p0"); + if (PTR_ERR(mxs_phy->phy_3p0) == -ENODEV) + /* not exist */ + mxs_phy->phy_3p0 = NULL; + else if (IS_ERR(mxs_phy->phy_3p0)) + return dev_err_probe(&pdev->dev, PTR_ERR(mxs_phy->phy_3p0), + "Getting regulator error\n"); + + if (mxs_phy->phy_3p0) + regulator_set_voltage(mxs_phy->phy_3p0, 3200000, 3200000); + platform_set_drvdata(pdev, mxs_phy); device_set_wakeup_capable(&pdev->dev, true);
Enable regulator 'phy-3p0' to pass eye diagram test since it improve signal qualilty. Signed-off-by: Xu Yang <xu.yang_2@nxp.com> --- Changes in v2: - rewrite commit message - use dev_err_probe() as suggested by Frank Li --- drivers/usb/phy/phy-mxs-usb.c | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)