Commit 54fb5ba6 authored Aug 19, 2019 by Thinh Nguyen Committed by Felipe Balbi Aug 28, 2019

usb: dwc3: gadget: Set BESL config parameter



When operating with LPM signals, the controller asserts the deep
low-power signal (utmi_l1_suspend_n) to the phy when the BESL value of
the LPM token is equal to or greater than DCTL.HIRD_Thres[3:0] (and
with DCTL.HIRD_Thres[4] set). Otherwise, the shallow low-power signal
(utmi_sleep_n) is asserted. Set the recommended deep BESL equal to the
controller's DCTL.HIRD_Thres[3:0] setting, and set the baseline BESL
to 0 for the shallow low-power signal. This maximizes the opportunity
for L1 residency and optimizes power savings.

Signed-off-by: Thinh Nguyen <thinhn@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

parent 16fe4f30

drivers/usb/dwc3/gadget.c

+10 −0

Original line number	Original line	Diff line number	Diff line
	@@ -2078,6 +2078,16 @@ static void dwc3_gadget_config_params(struct usb_gadget *g,
	{		{
	struct dwc3 *dwc = gadget_to_dwc(g);		struct dwc3 *dwc = gadget_to_dwc(g);

			params->besl_baseline = USB_DEFAULT_BESL_UNSPECIFIED;
			params->besl_deep = USB_DEFAULT_BESL_UNSPECIFIED;

			/* Recommended BESL */
			if (!dwc->dis_enblslpm_quirk) {
			params->besl_baseline = 0;
			if (dwc->is_utmi_l1_suspend)
			params->besl_deep = min_t(u8, dwc->hird_threshold, 15);
			}

	/* U1 Device exit Latency */		/* U1 Device exit Latency */
	if (dwc->dis_u1_entry_quirk)		if (dwc->dis_u1_entry_quirk)
	params->bU1devExitLat = 0;		params->bU1devExitLat = 0;

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