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Subject[PATCH] usb: dwc3: meson-g12a: Add support for IRQ based OTG switching
Date
Add support for the OTG ID change interrupt to switch between Host
and Device mode.

Tested on the Hardkernel Odroid-N2 board.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
---
drivers/usb/dwc3/dwc3-meson-g12a.c | 32 ++++++++++++++++++++++++++++--
1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-meson-g12a.c b/drivers/usb/dwc3/dwc3-meson-g12a.c
index 2aec31a2eacb..e5c5ad0d529e 100644
--- a/drivers/usb/dwc3/dwc3-meson-g12a.c
+++ b/drivers/usb/dwc3/dwc3-meson-g12a.c
@@ -348,6 +348,22 @@ static enum usb_role dwc3_meson_g12a_role_get(struct device *dev)
USB_ROLE_HOST : USB_ROLE_DEVICE;
}

+static irqreturn_t dwc3_meson_g12a_irq_thread(int irq, void *data)
+{
+ struct dwc3_meson_g12a *priv = data;
+ enum phy_mode otg_id;
+
+ otg_id = dwc3_meson_g12a_get_id(priv);
+ if (otg_id != priv->otg_phy_mode) {
+ if (dwc3_meson_g12a_otg_mode_set(priv, otg_id))
+ dev_warn(priv->dev, "Failed to switch OTG mode\n");
+ }
+
+ regmap_update_bits(priv->regmap, USB_R5, USB_R5_ID_DIG_IRQ, 0);
+
+ return IRQ_HANDLED;
+}
+
static struct device *dwc3_meson_g12_find_child(struct device *dev,
const char *compatible)
{
@@ -374,7 +390,7 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
void __iomem *base;
struct resource *res;
enum phy_mode otg_id;
- int ret, i;
+ int ret, i, irq;

priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -436,6 +452,19 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)
/* Get dr_mode */
priv->otg_mode = usb_get_dr_mode(dev);

+ if (priv->otg_mode == USB_DR_MODE_OTG) {
+ /* Ack irq before registering */
+ regmap_update_bits(priv->regmap, USB_R5,
+ USB_R5_ID_DIG_IRQ, 0);
+
+ irq = platform_get_irq(pdev, 0);
+ ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+ dwc3_meson_g12a_irq_thread,
+ IRQF_ONESHOT, pdev->name, priv);
+ if (ret)
+ return ret;
+ }
+
dwc3_meson_g12a_usb_init(priv);

/* Init PHYs */
@@ -460,7 +489,6 @@ static int dwc3_meson_g12a_probe(struct platform_device *pdev)

/* Setup OTG mode corresponding to the ID pin */
if (priv->otg_mode == USB_DR_MODE_OTG) {
- /* TOFIX Handle ID mode toggling via IRQ */
otg_id = dwc3_meson_g12a_get_id(priv);
if (otg_id != priv->otg_phy_mode) {
if (dwc3_meson_g12a_otg_mode_set(priv, otg_id))
--
2.21.0
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