On 3/17/21 4:52 PM, João Loureiro wrote:

When `usb start` is called on the terminal, the dwc2 driver will try to start every USB device as host first, even if it is explicitly configured as peripheral in the device tree (dr_mode = "peripheral").

So to avoid an unwanted 15 seconds delay when initializing the usb (one second per channel = 1s x 15), this patch adds a check to the initialization, and will skip host initialization of the device is explicitly set as peripheral. The checking is already done similarly in the `drivers/usb/gadget/dwc2_udc_otg.c` driver.

[...]

---

drivers/usb/host/dwc2.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)

A few more things, next time you send a subsequent version of the patch, use PATCH vX and document the patch changelog below the diffstat (i.e. V2: changed foo because bar).

Also, add tags to subject, for this patch it would be "usb: dwc2:". I can fill them in when applying, but in case there is a V3 of this patch, update those in your tree too.

Finally, use ./scripts/get_maintainer to find out who to CC. I'm adding a few more DWC2 users.

diff --git a/drivers/usb/host/dwc2.c b/drivers/usb/host/dwc2.c index ec643e9f45..43cc2e0433 100644 --- a/drivers/usb/host/dwc2.c +++ b/drivers/usb/host/dwc2.c @@ -21,6 +21,7 @@ #include <asm/io.h> #include <dm/device_compat.h> #include <linux/delay.h> +#include <linux/usb/otg.h> #include <power/regulator.h> #include <reset.h>

@@ -1204,7 +1205,13 @@ static int dwc2_init_common(struct udevice *dev, struct dwc2_priv *priv) #endif

dwc_otg_core_init(dev);

• dwc_otg_core_host_init(dev, regs);

• if (usb_get_dr_mode(dev_ofnode(dev)) == USB_DR_MODE_PERIPHERAL) {

• dev_dbg(dev, "USB device %s dr_mode set to %d. Skipping host_init.\n",
  

• 	dev->name, usb_get_dr_mode(dev_ofnode(dev)));
  

• } else {

• dwc_otg_core_host_init(dev, regs);
  

• }

  clrsetbits_le32(&regs->hprt0, DWC2_HPRT0_PRTENA | DWC2_HPRT0_PRTCONNDET | DWC2_HPRT0_PRTENCHNG |

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