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

[Sebastian Reichel]

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" <sebastian.reichel@xxxxxxxxxxxxx> wrote:
> >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 <sebastian.reichel@xxxxxxxxxxxxx>
> >---
> >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

Attachment: signature.asc
Description: PGP signature