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usb: dwc3: meson-g12a: Add support for IRQ based OTG switching

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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>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Neil Armstrong 2019-06-14 10:58:24 +02:00 committed by Felipe Balbi
parent 23c46801d1
commit f90db10779
1 changed files with 31 additions and 5 deletions
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36
drivers/usb/dwc3/dwc3-meson-g12a.c
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@ -11,9 +11,7 @@
* - Control registers for each USB2 Ports
* - Control registers for the USB PHY layer
* - SuperSpeed PHY can be enabled only if port is used
*
* TOFIX:
* - Add dynamic OTG switching with ID change interrupt
* - Dynamic OTG switching with ID change interrupt
*/
#include <linux/module.h>
@ -348,6 +346,22 @@ 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 +388,7 @@ 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 +450,19 @@ 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 +487,6 @@ 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))