linux-kernel - Re: [PATCH v14 13/28] drm/connector: hdmi: Add custom hook to filter TMDS character rate

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Message-ID: <hjz32n3wokppjxdpzu2lsoypno2dy6thi3tfrkhy76g7v2a5aq@5hjjd52fsqup>
Date: Thu, 23 May 2024 13:03:58 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Maxime Ripard <mripard@...nel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, 
	Daniel Vetter <daniel@...ll.ch>, Jonathan Corbet <corbet@....net>, 
	Sandy Huang <hjc@...k-chips.com>, Heiko Stübner <heiko@...ech.de>, 
	Chen-Yu Tsai <wens@...e.org>, Jernej Skrabec <jernej.skrabec@...il.com>, 
	Samuel Holland <samuel@...lland.org>, Andy Yan <andy.yan@...k-chips.com>, 
	Hans Verkuil <hverkuil@...all.nl>, Sebastian Wick <sebastian.wick@...hat.com>, 
	Ville Syrjälä <ville.syrjala@...ux.intel.com>, dri-devel@...ts.freedesktop.org, 
	linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org, linux-sunxi@...ts.linux.dev, 
	Dave Stevenson <dave.stevenson@...pberrypi.com>
Subject: Re: [PATCH v14 13/28] drm/connector: hdmi: Add custom hook to filter
 TMDS character rate

On Tue, May 21, 2024 at 12:13:46PM +0200, Maxime Ripard wrote:
> Most of the HDMI controllers have an upper TMDS character rate limit
> they can't exceed. On "embedded"-grade display controllers, it will
> typically be lower than what high-grade monitors can provide these days,
> so drivers will filter the TMDS character rate based on the controller
> capabilities.
> 
> To make that easier to handle for drivers, let's provide an optional
> hook to be implemented by drivers so they can tell the HDMI controller
> helpers if a given TMDS character rate is reachable for them or not.
> 
> This will then be useful to figure out the best format and bpc count for
> a given mode.
> 
> Reviewed-by: Dave Stevenson <dave.stevenson@...pberrypi.com>
> Signed-off-by: Maxime Ripard <mripard@...nel.org>
> ---
>  drivers/gpu/drm/display/drm_hdmi_state_helper.c    |  9 +++++++
>  drivers/gpu/drm/drm_connector.c                    |  4 +++
>  drivers/gpu/drm/tests/drm_connector_test.c         | 14 ++++++++++
>  drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c |  4 +++
>  include/drm/drm_connector.h                        | 31 ++++++++++++++++++++++
>  5 files changed, 62 insertions(+)
> 


Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

-- 
With best wishes
Dmitry