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WORKAROUND: arm64: dts: qcom: monaco-evk: Use refgen regulator for us…#916

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swatagar wants to merge 1 commit intoqualcomm-linux:tech/all/dt/qcs8300from
swatagar:RB4_USB_WA
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WORKAROUND: arm64: dts: qcom: monaco-evk: Use refgen regulator for us…#916
swatagar wants to merge 1 commit intoqualcomm-linux:tech/all/dt/qcs8300from
swatagar:RB4_USB_WA

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@swatagar swatagar commented Apr 8, 2026

Use refgen regulator for usb2 HS PHY for adb going offline issue.

CRs-Fixed: 4484198

…b2 HS PHY

Use refgen regulator for usb2 HS PHY for adb going offline issue.

Signed-off-by: Swati Agarwal <swati.agarwal@oss.qualcomm.com>
@qcomlnxci qcomlnxci requested a review from a team April 8, 2026 11:46
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why are we not able to submit upstream ?

@swatagar
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why are we not able to submit upstream ?

This is just a workaround to unblock automation team. When we figure out actual fix we will upstream it.

@shashim-quic
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why are we not able to submit upstream ?

This is just a workaround to unblock automation team. When we figure out actual fix we will upstream it.

can you please provide more details and if we started discussing upstream.
What is the issue here is not clear ?

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why are we not able to submit upstream ?

This is just a workaround to unblock automation team. When we figure out actual fix we will upstream it.

can you please provide more details and if we started discussing upstream. What is the issue here is not clear ?

qualcomm-linux/kernel@fc406be#diff-86029d2720afa1a45f36f218368644788a50c2d462cf81678ed00b7dcdef7d69R5766

qualcomm-linux/kernel@2c9e4d7

Introduction of above two PR leads to ADB going offline in few seconds for RB4. On RB4, ADB is on micro-USB port (USB2). We are using three power supply for USB2 HS PHY l7a, l9a and l7c respectively for .8v, 3.3v and 1.8v as per power grid. But as per power grid analysis; they are l4a, l8a, s4a respectively for .8v, 3.3v and 1.8v. We are trying to understand from SVE team why there is disparity in PG and PGA chart for USBHS PHY after we encounter this issue. Also, when I replaced, .8v supply which is l7a with refgen then I am not encountering this issue.

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3 participants