linux-kernel - Re: [PATCH v10 3/6] drm/bridge: cadence: cdns-mhdp8546-core: Handle HDCP state in bridge atomic check

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Message-ID: <36009b8f-c759-4212-8070-ef15c8a2f0a4@ideasonboard.com>
Date: Mon, 22 Dec 2025 14:56:10 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Harikrishna Shenoy <h-shenoy@...com>
Cc: Laurent.pinchart@...asonboard.com, airlied@...il.com,
 andrzej.hajda@...el.com, andy.yan@...k-chips.com, aradhya.bhatia@...ux.dev,
 devarsht@...com, dianders@...omium.org, dri-devel@...ts.freedesktop.org,
 javierm@...hat.com, jernej.skrabec@...il.com, jonas@...boo.se,
 linux-kernel@...r.kernel.org, linux@...blig.org, luca.ceresoli@...tlin.com,
 lumag@...nel.org, lyude@...hat.com, maarten.lankhorst@...ux.intel.com,
 mordan@...ras.ru, mripard@...nel.org, neil.armstrong@...aro.org,
 rfoss@...nel.org, s-jain1@...com, simona@...ll.ch, tzimmermann@...e.de,
 u-kumar1@...com
Subject: Re: [PATCH v10 3/6] drm/bridge: cadence: cdns-mhdp8546-core: Handle
 HDCP state in bridge atomic check

Hi,

On 09/12/2025 14:03, Harikrishna Shenoy wrote:
> Now that we have DRM_BRIDGE_ATTACH_NO_CONNECTOR framework, handle the
> HDCP state change in bridge atomic check as well to enable correct
> functioning for HDCP in both DRM_BRIDGE_ATTACH_NO_CONNECTOR and
> !DRM_BRIDGE_ATTACH_NO_CONNECTOR case.
> 
> Without this patch, when using DRM_BRIDGE_ATTACH_NO_CONNECTOR flag, HDCP
> state changes would not be properly handled during atomic commits,
> potentially leading to HDCP authentication failures or incorrect
> protection status for content requiring HDCP encryption.
> 
> Fixes: 6a3608eae6d33 ("drm: bridge: cdns-mhdp8546: Enable HDCP")
> Signed-off-by: Harikrishna Shenoy <h-shenoy@...com>
> ---
>  .../drm/bridge/cadence/cdns-mhdp8546-core.c   | 23 +++++++++++++++++++
>  1 file changed, 23 insertions(+)
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

 Tomi