linux-kernel - Re: [PATCH v14 11/28] drm/connector: hdmi: Calculate TMDS character rate

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Message-ID: <2drjirwwj3cwm4saboa5qnhwi7wev5gnilg24u7svz2iw3gtef@jainjgtog3uf>
Date: Thu, 23 May 2024 12:39:46 +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 11/28] drm/connector: hdmi: Calculate TMDS character
 rate

On Tue, May 21, 2024 at 12:13:44PM +0200, Maxime Ripard wrote:
> Most HDMI drivers have some code to calculate the TMDS character rate,
> usually to adjust an internal clock to match what the mode requires.
> 
> Since the TMDS character rates mostly depends on the resolution, whether
> we need to repeat pixels or not, the bpc count and the format, we can
> now derive it from the HDMI connector state that stores all those infos
> and remove the duplication from drivers.
> 
> 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    | 67 ++++++++++++++++++++++
>  drivers/gpu/drm/drm_atomic.c                       |  1 +
>  drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c |  3 +
>  include/drm/drm_connector.h                        |  5 ++
>  4 files changed, 76 insertions(+)


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

-- 
With best wishes
Dmitry