linux-kernel - Re: [PATCH 0/5] Add DisplayPort support for rk3576

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Message-ID: <C5D30204B8186D5B+5f2f87f2-3fff-403e-a439-847fda61e2d8@airkyi.com>
Date: Wed, 14 Jan 2026 09:42:39 +0800
From: Chaoyi Chen <kernel@...kyi.com>
To: Sebastian Reichel <sebastian.reichel@...labora.com>
Cc: Andy Yan <andyshrk@....com>, heiko@...ech.de,
 dmitry.baryshkov@....qualcomm.com, krzk+dt@...nel.org, conor+dt@...nel.org,
 cristian.ciocaltea@...labora.com, Laurent.pinchart@...asonboard.com,
 mripard@...nel.org, hjc@...k-chips.com, robh@...nel.org,
 tzimmermann@...e.de, devicetree@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
 Andy Yan <andy.yan@...k-chips.com>
Subject: Re: [PATCH 0/5] Add DisplayPort support for rk3576

Hi Sebastian,

On 1/14/2026 5:51 AM, Sebastian Reichel wrote:
> Hi,
> 
> On Fri, Jan 09, 2026 at 04:00:43PM +0800, Andy Yan wrote:
>> From: Andy Yan <andy.yan@...k-chips.com>
>>
>> The DisplayPort found on RK3576 is very similar to that of RK3588,
>> but work in qual pixel mode and support for MST.
>>
>> This patch series aims to add basic display output, not include
>> audio and MST, which will be the work for the next stage.
>>
>> Only test with 2 lane standard DP port output now.
> 
> This is a nice minimal series :) I got it working to some degree on
> the RK3576 Sige5 USB-C port. The display connection detection is
> _very_ unstable, but that part is handled by the TypeC Port Manager
> and unrelated to the DP controller (and already an issue on the RK3588
> based Rock 5B). IF the display is detected (i.e. USB-C side worked
> properly), the DP controller managed to do proper output too. Thus
> I believe this should be merged. I plan to look into the TCPM issues
> in the meantime.

Based on experience with other platforms, I suspect that some HPD events
are not being properly propagated to the DP driver. This might be worth 
looking into.

-- 
Best, 
Chaoyi