linux-kernel - Re: [PATCH v3 02/11] drm: Rename plane atomic

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Date:   Fri, 19 Feb 2021 16:12:35 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>,
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Subject: Re: [PATCH v3 02/11] drm: Rename plane atomic_check state names

Hi Thomas,

Thanks for your review!

On Fri, Feb 19, 2021 at 03:49:22PM +0100, Thomas Zimmermann wrote:
> > diff --git a/drivers/gpu/drm/imx/ipuv3-plane.c b/drivers/gpu/drm/imx/ipuv3-plane.c
> > index 075508051b5f..1873a155bb26 100644
> > --- a/drivers/gpu/drm/imx/ipuv3-plane.c
> > +++ b/drivers/gpu/drm/imx/ipuv3-plane.c
> > @@ -337,12 +337,12 @@ static const struct drm_plane_funcs ipu_plane_funcs = {
> >   };
> >   static int ipu_plane_atomic_check(struct drm_plane *plane,
> > -				  struct drm_plane_state *state)
> > +				  struct drm_plane_state *new_state)
> 
> This function uses a different naming convention then the others?
> 
> >   {
> >   	struct drm_plane_state *old_state = plane->state;

So, the function already had a variable named old_state, so I was
actually trying to make the drivers consistent here: having one variable
with old_state and new_plane_state felt weird.

The heuristic is thus to use the convention of the driver if one exists
already, and if there's none pick new_plane_state.

It makes it indeed inconsistent across drivers, but it felt more natural
to be consistent within a single driver.

Maxime

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