linux-kernel - Re: [PATCH v4 0/6] Add HDMI CEC support to Rockchip RK3588/RK3576 SoCs

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Message-ID: <zni6d5udvawma6kcjp54d24kihlue543dfqc2ti3k43jntaphj@xtuusmebp6qj>
Date: Fri, 5 Sep 2025 17:27:02 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc: Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        Andy Yan <andy.yan@...k-chips.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, kernel@...labora.com,
        dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Algea Cao <algea.cao@...k-chips.com>,
        Derek Foreman <derek.foreman@...labora.com>,
        Daniel Stone <daniels@...labora.com>
Subject: Re: [PATCH v4 0/6] Add HDMI CEC support to Rockchip RK3588/RK3576
 SoCs

On Fri, Sep 05, 2025 at 09:32:36AM +0300, Cristian Ciocaltea wrote:
> Hi Dmitry,
> 
> On 9/5/25 2:48 AM, Dmitry Baryshkov wrote:
> > On Wed, Sep 03, 2025 at 09:50:58PM +0300, Cristian Ciocaltea wrote:
> >> The first patch in the series implements the CEC capability of the
> >> Synopsys DesignWare HDMI QP TX controller found in RK3588 & RK3576 Socs.
> >> This is based on the downstream code, but rewritten on top of the CEC
> >> helpers added recently to the DRM HDMI connector framework.
> >>
> >> The second patch is needed for RK3576 in order to fixup the timer base
> >> setup according to the actual reference clock rate, which differs
> >> slightly from RK3588.
> >>
> >> The following three patches setup platform data with the new information
> >> expected by the HDMI QP transmitter library, while improving the error
> >> handling in the probe path.
> >>
> >> Please note the CEC helpers were affected by a resource deallocation
> >> issue which could crash the kernel and freeze the system under certain
> >> test conditions.  This has been already fixed in v6.17-rc1 via commit
> >> 19920ab98e17 ("drm/display: hdmi-cec-helper: Fix adapter
> >> unregistration").
> >>
> >> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> > 
> > Cristian, I'm sorry for almost off-topic, but as you are working on this
> > driver: would it be possible to support HDMI (vendor-specific) and SPD
> > InfoFrames in the dw-hdmi-qp driver?
> 
> Sure, no worries.  I'll be on leave for the next two weeks, but I can handle
> it on my return.

Nice, thanks!

-- 
With best wishes
Dmitry