From: Felipe Balbi <balbi@ti.com>
Date: Tue, 18 Sep 2012 18:39:24 +0000 (+0300)
Subject: usb: dwc3: workaround: unexpected transtion U3 -> RESUME
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=0b0cc1cd31bed3e3147398e54530f1f819b27692;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

usb: dwc3: workaround: unexpected transtion U3 -> RESUME

In DWC3 versions < 2.50a configured without
Hibernation mode enabled, there will be an
extra link status change interrupt if device
detects host-initiated U3 exit.

In that case, core will generate an unnecessary
U3 -> RESUME transition which should be ignored
by the driver.

Signed-off-by: Felipe Balbi <balbi@ti.com>
---

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 4ffec1aa2e25..8e53acc0e43e 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2317,6 +2317,34 @@ static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
 		unsigned int evtinfo)
 {
 	enum dwc3_link_state	next = evtinfo & DWC3_LINK_STATE_MASK;
+	unsigned int		pwropt;
+
+	/*
+	 * WORKAROUND: DWC3 < 2.50a have an issue when configured without
+	 * Hibernation mode enabled which would show up when device detects
+	 * host-initiated U3 exit.
+	 *
+	 * In that case, device will generate a Link State Change Interrupt
+	 * from U3 to RESUME which is only necessary if Hibernation is
+	 * configured in.
+	 *
+	 * There are no functional changes due to such spurious event and we
+	 * just need to ignore it.
+	 *
+	 * Refers to:
+	 *
+	 * STAR#9000570034 RTL: SS Resume event generated in non-Hibernation
+	 * operational mode
+	 */
+	pwropt = DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1);
+	if ((dwc->revision < DWC3_REVISION_250A) &&
+			(pwropt != DWC3_GHWPARAMS1_EN_PWROPT_HIB)) {
+		if ((dwc->link_state == DWC3_LINK_STATE_U3) &&
+				(next == DWC3_LINK_STATE_RESUME)) {
+			dev_vdbg(dwc->dev, "ignoring transition U3 -> Resume\n");
+			return;
+		}
+	}
 
 	/*
 	 * WORKAROUND: DWC3 Revisions <1.83a have an issue which, depending