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usb: dwc3: gadget: Set BESL config parameter

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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>
This commit is contained in:
Thinh Nguyen
2019-08-19 18:36:06 -07:00
committed by Felipe Balbi
parent 16fe4f3040
commit 54fb5ba647
1 changed files with 10 additions and 0 deletions
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10
drivers/usb/dwc3/gadget.c
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@@ -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;