linux-kernel - Re: [PATCH 0/5] Introduce new mode validation callbacks

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Date:   Mon, 8 May 2017 09:58:49 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Jose Abreu <Jose.Abreu@...opsys.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Carlos Palminha <CARLOS.PALMINHA@...opsys.com>,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Dave Airlie <airlied@...ux.ie>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Archit Taneja <architt@...eaurora.org>
Subject: Re: [PATCH 0/5] Introduce new mode validation callbacks

On Thu, May 04, 2017 at 03:11:37PM +0100, Jose Abreu wrote:
> This series is a follow up from the discussion at [1]. We start by
> introducing crtc->mode_valid(), encoder->mode_valid() and
> bridge->mode_valid() callbacks which will be used in followup
> patches.
> 
> Next, at 2/5 we modify the connector probe helper so that only modes
> which are supported by a given encoder+crtc combination are probbed.
> 
> At 3/5 a helper function is introduced that calls all mode_valid()
> from a set of bridges.
> 
> At 4/5 we call all the mode_valid() callbacks for a given pipeline
> so that the mode is validated. This is done before calling mode_fixup().
> 
> Finally, at 5/5 we use the new crtc->mode_valid() callback in arcpgu
> and remove the atomic_check() callback.
> 
> [1] https://patchwork.kernel.org/patch/9702233/
> 
> Jose Abreu (5):
>   drm: Add crtc/encoder/bridge->mode_valid() callbacks
>   drm: Use new mode_valid() helpers in connector probe helper
>   drm: Introduce drm_bridge_mode_valid()
>   drm: Use mode_valid() in atomic modeset
>   drm: arc: Use crtc->mode_valid() callback
> 
> Cc: Carlos Palminha <palminha@...opsys.com>
> Cc: Alexey Brodkin <abrodkin@...opsys.com>
> Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> Cc: Dave Airlie <airlied@...ux.ie>
> Cc: Andrzej Hajda <a.hajda@...sung.com>
> Cc: Archit Taneja <architt@...eaurora.org>

Looks nice. A few small things from Ville and me, but with those addressed
this looks all ready for merging and seems like a good improvement to the
modeset framework.

Ok, one more patch at the end is needed: We need to review and upate the
kernel-doc for all the existing hooks, and add cross-links between
mode_valid and atomic_check respectively mode_fixup.

Some more drivers using this would be sweet too, but not a blocker.

Thanks, Daniel
> 
>  drivers/gpu/drm/arc/arcpgu_crtc.c        | 39 ++++++++------
>  drivers/gpu/drm/drm_atomic_helper.c      | 92 ++++++++++++++++++++++++++++++--
>  drivers/gpu/drm/drm_bridge.c             | 33 ++++++++++++
>  drivers/gpu/drm/drm_probe_helper.c       | 71 ++++++++++++++++++++++--
>  include/drm/drm_bridge.h                 | 22 ++++++++
>  include/drm/drm_modeset_helper_vtables.h | 40 ++++++++++++++
>  6 files changed, 275 insertions(+), 22 deletions(-)
> 
> -- 
> 1.9.1
> 
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch