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Subject[PATCH 06/13] 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 74d07ded8a7e..65c220b577d0 100644
--- a/drivers/usb/dwc3/dwc3-meson-g12a.c
+++ b/drivers/usb/dwc3/dwc3-meson-g12a.c
@@ -132,6 +132,8 @@ 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,
@@ -143,6 +145,8 @@ 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,
@@ -152,6 +156,7 @@ 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 = {
@@ -163,6 +168,7 @@ 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 {
@@ -223,15 +229,11 @@ 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;
@@ -276,9 +278,10 @@ 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,
@@ -293,11 +296,12 @@ 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;

@@ -319,7 +323,7 @@ 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;
}
@@ -398,7 +402,7 @@ 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;
}
@@ -545,6 +549,11 @@ 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;
@@ -612,7 +621,12 @@ 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;

@@ -634,6 +648,12 @@ 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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