Commit 5799aecd authored by Minas Harutyunyan's avatar Minas Harutyunyan Committed by Felipe Balbi
Browse files

usb: dwc2: Fix channel disable flow 



Channel disabling/halting should performed for enabled only channels
to avoid warnings "Unable to clear enable on channel N" which seen
if host works in Slave mode.

Signed-off-by: default avatarMinas Harutyunyan <hminas@synopsys.com>
Signed-off-by: default avatarFelipe Balbi <felipe.balbi@linux.intel.com>
parent c8006f67

drivers/usb/dwc2/hcd.c

+20 −14
Original line number Diff line number Diff line
@@ -2247,15 +2247,18 @@ static void dwc2_core_host_init(struct dwc2_hsotg *hsotg) 
		num_channels = hsotg->params.host_channels;

		for (i = 0; i < num_channels; i++) {

			hcchar = dwc2_readl(hsotg, HCCHAR(i));

			if (hcchar & HCCHAR_CHENA) {

				hcchar &= ~HCCHAR_CHENA;

				hcchar |= HCCHAR_CHDIS;

				hcchar &= ~HCCHAR_EPDIR;

				dwc2_writel(hsotg, hcchar, HCCHAR(i));

			}

		}



		/* Halt all channels to put them into a known state */

		for (i = 0; i < num_channels; i++) {

			hcchar = dwc2_readl(hsotg, HCCHAR(i));

			if (hcchar & HCCHAR_CHENA) {

				hcchar |= HCCHAR_CHENA | HCCHAR_CHDIS;

				hcchar &= ~HCCHAR_EPDIR;

				dwc2_writel(hsotg, hcchar, HCCHAR(i));
@@ -2263,12 +2266,15 @@ static void dwc2_core_host_init(struct dwc2_hsotg *hsotg) 
					__func__, i);



				if (dwc2_hsotg_wait_bit_clear(hsotg, HCCHAR(i),

						      HCCHAR_CHENA, 1000)) {

				dev_warn(hsotg->dev, "Unable to clear enable on channel %d\n",

							      HCCHAR_CHENA,

							      1000)) {

					dev_warn(hsotg->dev,

						 "Unable to clear enable on channel %d\n",

						 i);

				}

			}

		}

	}



	/* Enable ACG feature in host mode, if supported */

	dwc2_enable_acg(hsotg);

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