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Subject[PATCH v2 07/14] usb: dwc3: meson-g12a: refactor usb init
Date
Refactor the USB init code patch to handle the Amlogic GXL/GXM needing
to initialize the OTG port as Peripheral mode for the DWC2 IP to probe
correctly.

A secondary, post_init callback is added to setup the OTG PHY mode after
the sub-nodes probe.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
drivers/usb/dwc3/dwc3-meson-g12a.c | 46 +++++++++++++++++++++---------
1 file changed, 33 insertions(+), 13 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-meson-g12a.c b/drivers/usb/dwc3/dwc3-meson-g12a.c
index 328e74def56f..43b398b7b1f7 100644
--- a/drivers/usb/dwc3/dwc3-meson-g12a.c
+++ b/drivers/usb/dwc3/dwc3-meson-g12a.c
@@ -140,6 +140,8 @@ struct dwc3_meson_g12a_drvdata {
enum phy_mode mode);
int (*set_phy_mode)(struct dwc3_meson_g12a *priv, int i,
enum phy_mode mode);
+ int (*usb_init)(struct dwc3_meson_g12a *priv);
+ int (*usb_post_init)(struct dwc3_meson_g12a *priv);
};

static int dwc3_meson_g12a_setup_regmaps(struct dwc3_meson_g12a *priv,
@@ -151,6 +153,8 @@ static int dwc3_meson_g12a_usb2_init_phy(struct dwc3_meson_g12a *priv, int i,
static int dwc3_meson_g12a_set_phy_mode(struct dwc3_meson_g12a *priv,
int i, enum phy_mode mode);

+static int dwc3_meson_g12a_usb_init(struct dwc3_meson_g12a *priv);
+
static struct dwc3_meson_g12a_drvdata g12a_drvdata = {
.otg_switch_supported = true,
.clks = meson_g12a_clocks,
@@ -160,6 +164,7 @@ static struct dwc3_meson_g12a_drvdata g12a_drvdata = {
.setup_regmaps = dwc3_meson_g12a_setup_regmaps,
.usb2_init_phy = dwc3_meson_g12a_usb2_init_phy,
.set_phy_mode = dwc3_meson_g12a_set_phy_mode,
+ .usb_init = dwc3_meson_g12a_usb_init,
};

static struct dwc3_meson_g12a_drvdata a1_drvdata = {
@@ -171,6 +176,7 @@ static struct dwc3_meson_g12a_drvdata a1_drvdata = {
.setup_regmaps = dwc3_meson_g12a_setup_regmaps,
.usb2_init_phy = dwc3_meson_g12a_usb2_init_phy,
.set_phy_mode = dwc3_meson_g12a_set_phy_mode,
+ .usb_init = dwc3_meson_g12a_usb_init,
};

struct dwc3_meson_g12a {
@@ -231,15 +237,11 @@ static int dwc3_meson_g12a_usb2_init_phy(struct dwc3_meson_g12a *priv, int i,
return 0;
}

-static int dwc3_meson_g12a_usb2_init(struct dwc3_meson_g12a *priv)
+static int dwc3_meson_g12a_usb2_init(struct dwc3_meson_g12a *priv,
+ enum phy_mode mode)
{
int i, ret;

- if (priv->otg_mode == USB_DR_MODE_PERIPHERAL)
- priv->otg_phy_mode = PHY_MODE_USB_DEVICE;
- else
- priv->otg_phy_mode = PHY_MODE_USB_HOST;
-
for (i = 0; i < priv->drvdata->num_phys; ++i) {
if (!priv->phys[i])
continue;
@@ -284,9 +286,10 @@ static void dwc3_meson_g12a_usb3_init(struct dwc3_meson_g12a *priv)
FIELD_PREP(USB_R1_P30_PCS_TX_SWING_FULL_MASK, 127));
}

-static void dwc3_meson_g12a_usb_otg_apply_mode(struct dwc3_meson_g12a *priv)
+static void dwc3_meson_g12a_usb_otg_apply_mode(struct dwc3_meson_g12a *priv,
+ enum phy_mode mode)
{
- if (priv->otg_phy_mode == PHY_MODE_USB_DEVICE) {
+ if (mode == PHY_MODE_USB_DEVICE) {
regmap_update_bits(priv->usb_glue_regmap, USB_R0,
USB_R0_U2D_ACT, USB_R0_U2D_ACT);
regmap_update_bits(priv->usb_glue_regmap, USB_R0,
@@ -301,11 +304,12 @@ static void dwc3_meson_g12a_usb_otg_apply_mode(struct dwc3_meson_g12a *priv)
}
}

-static int dwc3_meson_g12a_usb_init(struct dwc3_meson_g12a *priv)
+static int dwc3_meson_g12a_usb_init_glue(struct dwc3_meson_g12a *priv,
+ enum phy_mode mode)
{
int ret;

- ret = dwc3_meson_g12a_usb2_init(priv);
+ ret = dwc3_meson_g12a_usb2_init(priv, mode);
if (ret)
return ret;

@@ -327,7 +331,7 @@ static int dwc3_meson_g12a_usb_init(struct dwc3_meson_g12a *priv)
if (priv->usb3_ports)
dwc3_meson_g12a_usb3_init(priv);

- dwc3_meson_g12a_usb_otg_apply_mode(priv);
+ dwc3_meson_g12a_usb_otg_apply_mode(priv, mode);

return 0;
}
@@ -406,7 +410,7 @@ static int dwc3_meson_g12a_otg_mode_set(struct dwc3_meson_g12a *priv,
if (ret)
return ret;

- dwc3_meson_g12a_usb_otg_apply_mode(priv);
+ dwc3_meson_g12a_usb_otg_apply_mode(priv, mode);

return 0;
}
@@ -553,6 +557,11 @@ static int dwc3_meson_g12a_setup_regmaps(struct dwc3_meson_g12a *priv,
return 0;
}

+static int dwc3_meson_g12a_usb_init(struct dwc3_meson_g12a *priv)
+{
+ return dwc3_meson_g12a_usb_init_glue(priv, priv->otg_phy_mode);
+}
+
static int dwc3_meson_g12a_probe(struct platform_device *pdev)
{
struct dwc3_meson_g12a *priv;
@@ -620,7 +629,12 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
/* Get dr_mode */
priv->otg_mode = usb_get_dr_mode(dev);

- ret = dwc3_meson_g12a_usb_init(priv);
+ if (priv->otg_mode == USB_DR_MODE_PERIPHERAL)
+ priv->otg_phy_mode = PHY_MODE_USB_DEVICE;
+ else
+ priv->otg_phy_mode = PHY_MODE_USB_HOST;
+
+ ret = priv->drvdata->usb_init(priv);
if (ret)
goto err_disable_clks;

@@ -642,6 +656,12 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
if (ret)
goto err_phys_power;

+ if (priv->drvdata->usb_post_init) {
+ ret = priv->drvdata->usb_post_init(priv);
+ if (ret)
+ goto err_phys_power;
+ }
+
ret = dwc3_meson_g12a_otg_init(pdev, priv);
if (ret)
goto err_phys_power;
--
2.22.0
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