It is observed while testing multiple audio devices, a glitch is observed during testing. As per dwc datasheet,By default, HC reserves 80% of the bandwidth for periodic EPs. Add quirk to set GUCTL BIT 16 to accommodate higher bandwidth for 2 isoc eps. If this bit is set, the bandwidth is relaxed to 85% to accommodate two high speed, high bandwidth ISOC EPs. USB 2.0 required 80% bandwidth allocated for ISOC traffic. If two High-bandwidth ISOC devices (HD Webcams) are connected, and if each requires 1024-bytes X 3 packets per Micro-Frame, then the bandwidth required is around 82%. If this bit is set, then it is possible to connect two Webcams of 1024bytes X 3 paylod per Micro-Frame each. Otherwise, you may have to reduce the resolution of the Webcams. This bit is valid in Host and DRD configuration and is used in host mode operation only. USe this quirk to set bit for host mode uvc uac usecases where two isoc eps are used and flicker is seen. Signed-off-by: Akash Kumar <quic_akakum@xxxxxxxxxxx> --- arch/arm64/boot/dts/qcom/sa8775p.dtsi | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/arm64/boot/dts/qcom/sa8775p.dtsi b/arch/arm64/boot/dts/qcom/sa8775p.dtsi index 3394ae2d1300..230b432cc3ac 100644 --- a/arch/arm64/boot/dts/qcom/sa8775p.dtsi +++ b/arch/arm64/boot/dts/qcom/sa8775p.dtsi @@ -3431,6 +3431,7 @@ phy-names = "usb2-phy", "usb3-phy"; snps,dis-u1-entry-quirk; snps,dis-u2-entry-quirk; + snps,dwc3_guctl_resbwhseps_quirk; }; }; @@ -3522,6 +3523,7 @@ phy-names = "usb2-phy", "usb3-phy"; snps,dis-u1-entry-quirk; snps,dis-u2-entry-quirk; + snps,dwc3_guctl_resbwhseps_quirk; }; }; @@ -3587,6 +3589,7 @@ phy-names = "usb2-phy"; snps,dis-u1-entry-quirk; snps,dis-u2-entry-quirk; + snps,dwc3_guctl_resbwhseps_quirk; }; }; -- 2.17.1
