arm64: dts: qcom: sm6350: Disable USB U1/U2 entry

Disable U1 and U2 power-saving states to improve stability of USB.
These low-power link states, designed to reduce power consumption
during idle periods, can cause issues in latency-sensitive or high
throughput use cases. Over the years, some of the issues seen are
as follows:

1. In device mode of operation, when UVC is active, enabling U1/U2
is sometimes causing packets drops due to delay in entry/exit of
intermittent these low power states. These packet drops are often
reflected as missed isochronous transfers, as the controller wasn't
able to send packet in that microframe interval and hence glitches
are seen on the final transmitted video output.

2. On older targets like SM8150/SM8250/SM8350, there have been
throughput issues seen during tethering use cases.

Disabling these intermittent power states enhances device stability
without affecting power usage.

Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
Signed-off-by: Prashanth K <quic_prashk@quicinc.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20241231081115.3149850-7-quic_prashk@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/arch/arm64/boot/dts/qcom/sm6350.dtsi b/arch/arm64/boot/dts/qcom/sm6350.dtsi
index 7b5c340df5f6f32233f4254db2012f84bdde6be2..506e9ebea0e94dc1e2378b85145ea79d3096c3da 100644 (file)
--- a/arch/arm64/boot/dts/qcom/sm6350.dtsi
+++ b/arch/arm64/boot/dts/qcom/sm6350.dtsi
@@ -1924,6 +1924,8 @@
                                snps,has-lpm-erratum;
                                snps,hird-threshold = /bits/ 8 <0x10>;
                                snps,parkmode-disable-ss-quirk;
+                               snps,dis-u1-entry-quirk;
+                               snps,dis-u2-entry-quirk;
                                phys = <&usb_1_hsphy>, <&usb_1_qmpphy QMP_USB43DP_USB3_PHY>;
                                phy-names = "usb2-phy", "usb3-phy";
                                usb-role-switch;