linux-kernel - Re: [PATCH v5 5/9] drm/msm/hdmi: turn mode_set into atomic

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Message-ID: <xymopystyfjj3hpqes3uiw2g3dqynxzvz23snrbfzf2judgxnt@j4nmpcbuy7a4>
Date: Thu, 20 Jun 2024 23:32:48 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc: 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>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, Rob Clark <robdclark@...il.com>, 
	Sean Paul <sean@...rly.run>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 5/9] drm/msm/hdmi: turn mode_set into atomic_enable

On Thu, Jun 20, 2024 at 01:27:15PM GMT, Abhinav Kumar wrote:
> 
> 
> On 6/7/2024 6:23 AM, Dmitry Baryshkov wrote:
> > The mode_set callback is deprecated, it doesn't get the
> > drm_bridge_state, just mode-related argumetns. Turn it into the
> > atomic_enable callback as suggested by the documentation.
> > 
> 
> mode_set is deprecated but atomic_mode_set is not.

There is no atomic_mode_set() in drm_bridge_funcs. Also:

* This is deprecated, do not use!
* New drivers shall set their mode in the
* &drm_bridge_funcs.atomic_enable operation.

> 
> I would rather use atomic_mode_set because moving to atomic_enable() would
> be incorrect.
> 
> That would be called after encoder's enable and hence changes the sequence.
> That was not the intention of this patch.
> 
> NAK.
> 
> > Acked-by: Maxime Ripard <mripard@...nel.org>
> > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> > ---
> >   drivers/gpu/drm/msm/hdmi/hdmi_bridge.c | 33 ++++++++++++++++++++++++++-------
> >   1 file changed, 26 insertions(+), 7 deletions(-)


-- 
With best wishes
Dmitry