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

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Message-ID: <b8d068ef-d083-4bb1-b34e-b8ddaa62b436@collabora.com>
Date: Fri, 5 Sep 2025 09:32:36 +0300
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.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

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.

Regards,
Cristian