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[PATCH/RFC] usb: dwc2: awake rt305x USB controller

Message ID 20180720120558.8831-1-john@phrozen.org (mailing list archive)
State New, archived
Headers show

Commit Message

John Crispin July 20, 2018, 12:05 p.m. UTC 
From: Serge Vasilugin <vasilugin@yandex.ru>

The Ralink uboot sets the USB controller into sleep mode. This patch checks
this condition and awakes controller before any register access.

Signed-off-by: Serge Vasilugin <vasilugin@yandex.ru>
Signed-off-by: John Crispin <john@phrozen.org>
---
Hi,
we have been carrying this patch inside OpenWrt for half a decade. The
USB driver that is included in the Ralink SDK does a mdelay(25) after
this call but it works without apparently.
	John

 drivers/usb/dwc2/platform.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox

Patch

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 4c0819554bcd..0bc9fd65e29e 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -419,6 +419,10 @@  static int dwc2_driver_probe(struct platform_device *dev)
 	if (retval)
 		return retval;
 
+	/* Enable USB port before any regs access */
+	if (dwc2_readl(hsotg->regs + PCGCTL) & 0x0f)
+		dwc2_writel(0x00, hsotg->regs + PCGCTL);
+
 	retval = dwc2_get_dr_mode(hsotg);
 	if (retval)
 		goto error;