[PATCH 00/10] Synopsys DisplayPort Controller improvements for Rockchip platforms

[Chaoyi Chen]

Hello Sebastian, 

On 3/27/2026 1:31 AM, Sebastian Reichel wrote:
> This patch series updates the Synopsys Designware DisplayPort bridge
> together with the only existing user: The Rockchip RK3576/RK3588:
> 
>  1. follow-up bridges (PHY, USB-C connector)
>     this is needed to get USB-C DP AltMode working; I've followed the
>     Qualcomm driver as reference
> 
>  2. runtime PM
>     the initial driver has been upstreamed without RPM; add it to
>     avoid wasting power when nothing is plugged
> 
>  3. audio
>     the initial driver has been upstreamed without audio support;
>     this adds all missing bits for audio with single stream transport
> 
> The series is based on drm-misc-next with Cristian's cleanup series
> applied as I expect that to land first:
> 
> https://lore.kernel.org/linux-rockchip/20260310-drm-rk-fixes-v2-0-645ecfb43f49@collabora.com/
> 
> To properly make use of the bridge code the following USBDP PHY series
> is also needed:
> 
> https://lore.kernel.org/linux-rockchip/20260313-rockchip-usbdp-cleanup-v3-0-3e8fe89a35b5@collabora.com/
> 
> There are two parts, which possibly need some discussion:
> 
>  1. I added a dedicated bridge callback for out-of-band hotplug events,
>     which is separate from the hotplug_notify. I have a feeling, that
>     there might be a better solution, but haven't found it.
> 

Could you explain what an out-of-band hotplug event is?

Can't the drivers/usb/typec/altmodes/displayport.c respond to these
hot-plug events? Thank you.


>  2. The DT binding for audio support - explicitly marked as RFC - works
>     perfectly fine, but is not ready for MST. I don't intend to
>     implement that right now, but the binding should obviously take it
>     into consideration to avoid breaking it in the future. I've put
>     some points for discussion into the relevant patch.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel at collabora.com>
> ---
> Sebastian Reichel (10):
>       drm/bridge: synopsys: dw-dp: Simplify driver data setting
>       drm/bridge: synopsys: dw-dp: Support MEDIA_BUS_FMT_FIXED
>       drm/bridge: synopsys: dw-dp: Add follow-up bridge support
>       drm/bridge: Add out-of-band HPD notify handler
>       drm/bridge: synopsys: dw-dp: Support software triggered OOB HPD
>       drm/rockchip: dw_dp: Implement out-of-band HPD handling
>       drm/bridge: synopsys: dw-dp: Add Runtime PM support
>       drm/rockchip: dw_dp: Add runtime PM support
>       [RFC] dt-bindings: display: rockchip: dw-dp: fix sound DAI cells
>       drm/bridge: synopsys: dw-dp: Add audio support
> 
>  .../bindings/display/rockchip/rockchip,dw-dp.yaml  |   5 +-
>  drivers/gpu/drm/bridge/synopsys/dw-dp.c            | 284 ++++++++++++++++++++-
>  drivers/gpu/drm/display/drm_bridge_connector.c     |   6 +
>  drivers/gpu/drm/rockchip/dw_dp-rockchip.c          | 167 +++++++++++-
>  include/drm/bridge/dw_dp.h                         |   6 +
>  include/drm/drm_bridge.h                           |  14 +
>  6 files changed, 469 insertions(+), 13 deletions(-)
> ---
> base-commit: 0660ee19141e5e90b422b7daa0d8518a8d0d898b
> change-id: 20260325-synopsys-dw-dp-improvements-7da2e98df1dd
> 
> Best regards,

-- 
Best, 
Chaoyi