Re: [PATCH 0/4] Add HDMI 2.0 support to DW HDMI QP TX

From: "Diederik de Haas" <diederik@cknow-tech.com>
To: "Cristian Ciocaltea" <cristian.ciocaltea@collabora.com>,
	"Andrzej Hajda" <andrzej.hajda@intel.com>,
	"Neil Armstrong" <neil.armstrong@linaro.org>,
	"Robert Foss" <rfoss@kernel.org>,
	"Laurent Pinchart" <Laurent.pinchart@ideasonboard.com>,
	"Jonas Karlman" <jonas@kwiboo.se>,
	"Jernej Skrabec" <jernej.skrabec@gmail.com>,
	"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
	"Maxime Ripard" <mripard@kernel.org>,
	"Thomas Zimmermann" <tzimmermann@suse.de>,
	"David Airlie" <airlied@gmail.com>,
	"Simona Vetter" <simona@ffwll.ch>,
	"Sandy Huang" <hjc@rock-chips.com>,
	"Heiko Stübner" <heiko@sntech.de>,
	"Andy Yan" <andy.yan@rock-chips.com>
Cc: <kernel@collabora.com>, <dri-devel@lists.freedesktop.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-rockchip@lists.infradead.org>
Subject: Re: [PATCH 0/4] Add HDMI 2.0 support to DW HDMI QP TX
Date: Mon, 05 Jan 2026 19:03:32 +0100	[thread overview]
Message-ID: <DFGUQPIJWYDR.2LEI3CON9X7GJ@cknow-tech.com> (raw)
In-Reply-To: <20251203-dw-hdmi-qp-scramb-v1-0-836fe7401a69@collabora.com>

On Wed Dec 3, 2025 at 7:27 PM CET, Cristian Ciocaltea wrote:
> This patch series provides the missing support for high TMDS clock ratio
> and scrambling to DW HDMI QP TX library, required for handling HDMI 2.0
> display modes on RK3576 & RK3588 SoCs.

I tested this patch set with my 4K TV and Rock 5B and without it I did
not see 4K@60, only 4K@30. With this patch set also a number of 4K
related display settings appeared which were not there without it.
So thanks a lot for this patch set. Feel free to add:

Tested-by: Diederik de Haas <diederik@cknow-tech.com>

Cheers,
  Diederik

> In order to allow addressing the SCDC status lost on sink disconnects,
> it adds an atomic variant of the drm_bridge_funcs.detect callback and a
> new drm_bridge_detect_ctx() helper, which is further used in
> drm_bridge_connector to switch to ->detect_ctx hook.
>
> Furthermore, optimize HPD event handling in dw_hdmi_qp Rockchip platform
> driver to run the detect cycle on the affected connector only.
>
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
> ---
> Cristian Ciocaltea (4):
>       drm/bridge: Add ->detect_ctx hook and drm_bridge_detect_ctx()
>       drm/bridge-connector: Switch to using ->detect_ctx hook
>       drm/bridge: dw-hdmi-qp: Add high TMDS clock ratio and scrambling support
>       drm/rockchip: dw_hdmi_qp: Do not send HPD events for all connectors
>
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi-qp.c   | 174 +++++++++++++++++++++++--
>  drivers/gpu/drm/display/drm_bridge_connector.c |  73 ++++++-----
>  drivers/gpu/drm/drm_bridge.c                   |  58 +++++++++
>  drivers/gpu/drm/rockchip/dw_hdmi_qp-rockchip.c |  44 +++----
>  include/drm/drm_bridge.h                       |  30 +++++
>  5 files changed, 308 insertions(+), 71 deletions(-)
> ---
> base-commit: ac5b392a8c355001c4c3f230a0e4b1f904e359ca
> change-id: 20251203-dw-hdmi-qp-scramb-cdbd8b57ccf9
>
>
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