Re: [PATCH 0/7] phy: rockchip: usbdp: Fixes, DP 1-lane support and cleanups

Hi,

On Wed, Feb 04, 2026 at 08:09:22PM +0800, Andy Yan wrote:

Hello Sebastian，

At 2026-02-04 02:41:26, "Sebastian Reichel" [off-list ref] wrote:

quoted

As there are some issues with the DisplayPort support, I went
though Rockchip's BSP kernel tree and looked for fixes. I found
two small changes for the initial register setup, which do not
help with the DP issue but seem sensible in general. Afterwards
I added one more fix, which corrects an issue that effectively
results in USB-C adapters with combined USB3+DP capabilities
not being able to use the DP part.

Afterwards I added one more patch adding single-lane DP support
(found in Rockchip BSP kernel) and a couple of cleanups from my
side. These are logically independent from the fixes, but I put
all together in a single series because they need to be applied
in the right order to avoid conflicts.

Signed-off-by: Sebastian Reichel <redacted>
---
Frank Wang (1):
     phy: rockchip: usbdp: Amend SSC modulation deviation

Sebastian Reichel (4):
     phy: rockchip: usbdp: Add missing mode_change update
     phy: rockchip: usbdp: Rename DP lane functions
     phy: rockchip: usbdp: Use FIELD_PREP_WM16_CONST
     phy: rockchip: usbdp: Cleanup DP lane selection function

William Wu (1):
     phy: rockchip: usbdp: Fix LFPS detect threshold control

Zhang Yubing (1):
     phy: rockchip: usbdp: Support single-lane DP

drivers/phy/rockchip/phy-rockchip-usbdp.c | 114 +++++++++++++-----------------
1 file changed, 48 insertions(+), 66 deletions(-)

After applying this series of patches, the hub that previously
couldn’t recognize Alt Mode can now detect it and work properly,
but it also triggers a USB-related SERR — did I miss something？

I thought this was from a different patch that I needed to get DP
working. I've spent the last week debugging this and I'm just about
to send v2 with a workaround. FWIW the SError is not introduced by
this series, but before it was much harder to run into it.

Greetings,

-- Sebastian