diff mbox series

[v1,5/5] arm64: dts: qcom: qdu1000: Add snps,dis_u3_susphy_quirk

Message ID 20250325123019.597976-6-prashanth.k@oss.qualcomm.com (mailing list archive)
State New
Headers show
Series Add snps,dis_u3_susphy_quirk for some QC targets | expand

Commit Message

Prashanth K March 25, 2025, 12:30 p.m. UTC 
From: Pratham Pratap <quic_ppratap@quicinc.com>

During device mode initialization on certain QC targets, before the
runstop bit is set, sometimes it's observed that the GEVNTADR{LO/HI}
register write fails. As a result, GEVTADDR registers are still 0x0.
Upon setting runstop bit, DWC3 controller attempts to write the new
events to address 0x0, causing an SMMU fault and system crash.

This was initially observed on SM8450 and later reported on few
other targets as well. As suggested by Qualcomm HW team, clearing
the GUSB3PIPECTL.SUSPHY bit resolves the issue by preventing register
write failures. Address this by setting the snps,dis_u3_susphy_quirk
to keep the GUSB3PIPECTL.SUSPHY bit cleared. This change was tested
on multiple targets (SM8350, SM8450 QCS615 etc.) for over an year
and hasn't exhibited any side effects.

Signed-off-by: Pratham Pratap <quic_ppratap@quicinc.com>
Signed-off-by: Prashanth K <prashanth.k@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/qdu1000.dtsi | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/arch/arm64/boot/dts/qcom/qdu1000.dtsi b/arch/arm64/boot/dts/qcom/qdu1000.dtsi
index f973aa8f7477..b3c673e24726 100644
--- a/arch/arm64/boot/dts/qcom/qdu1000.dtsi
+++ b/arch/arm64/boot/dts/qcom/qdu1000.dtsi
@@ -1022,6 +1022,7 @@  usb_1_dwc3: usb@a600000 {
 
 				iommus = <&apps_smmu 0xc0 0x0>;
 				snps,dis_u2_susphy_quirk;
+				snps,dis_u3_susphy_quirk;
 				snps,dis_enblslpm_quirk;
 				snps,dis-u1-entry-quirk;
 				snps,dis-u2-entry-quirk;