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Date: Fri, 15 Jan 2021 23:20:21 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Maxime Ripard <maxime@...no.tech>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Thomas Zimmermann <tzimmermann@...e.de>,
Daniel Vetter <daniel.vetter@...el.com>,
David Airlie <airlied@...ux.ie>,
dri-devel@...ts.freedesktop.org,
Alexey Brodkin <abrodkin@...opsys.com>,
Daniel Vetter <daniel@...ll.ch>,
Liviu Dudau <liviu.dudau@....com>,
Brian Starkey <brian.starkey@....com>,
Russell King <linux@...linux.org.uk>,
Dave Airlie <airlied@...hat.com>,
Sam Ravnborg <sam@...nborg.org>,
Boris Brezillon <bbrezillon@...nel.org>,
Nicolas Ferre <nicolas.ferre@...rochip.com>,
Alexandre Belloni <alexandre.belloni@...tlin.com>,
Ludovic Desroches <ludovic.desroches@...rochip.com>,
Inki Dae <inki.dae@...sung.com>,
Joonyoung Shim <jy0922.shim@...sung.com>,
Seung-Woo Kim <sw0312.kim@...sung.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Krzysztof Kozlowski <krzk@...nel.org>,
Stefan Agner <stefan@...er.ch>,
Alison Wang <alison.wang@....com>,
Xinliang Liu <xinliang.liu@...aro.org>,
Tian Tao <tiantao6@...ilicon.com>,
John Stultz <john.stultz@...aro.org>,
Xinwei Kong <kong.kongxinwei@...ilicon.com>,
Chen Feng <puck.chen@...ilicon.com>,
Laurentiu Palcu <laurentiu.palcu@....nxp.com>,
Lucas Stach <l.stach@...gutronix.de>,
Philipp Zabel <p.zabel@...gutronix.de>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
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Jerome Brunet <jbrunet@...libre.com>,
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Philippe Cornu <philippe.cornu@...com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
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Subject: Re: [PATCH 10/10] drm: Use state helper instead of the plane state
pointer
Hi Maxime,
Thank you for the patch.
On Fri, Jan 15, 2021 at 01:57:02PM +0100, Maxime Ripard wrote:
> Many drivers reference the plane->state pointer in order to get the
> current plane state in their atomic_update or atomic_disable hooks,
Please don't use the word "current", it's ambiguous. Do you mean old
state or new state ?
> which would be the new plane state in the global atomic state since
> _swap_state happened when those hooks are run.
Is this relevant ? drm_atomic_helper_swap_state() doesn't change the
old_state and new_state pointers in drm_atomic_state as far as I can
tell.
> Use the drm_atomic_get_new_plane_state helper to get that state to make it
> more obvious.
>
> This was made using the coccinelle script below:
>
> @ plane_atomic_func @
> identifier helpers;
> identifier func;
> @@
>
> (
> static const struct drm_plane_helper_funcs helpers = {
> ...,
> .atomic_disable = func,
> ...,
> };
> |
> static const struct drm_plane_helper_funcs helpers = {
> ...,
> .atomic_update = func,
> ...,
> };
> )
>
> @ adds_new_state @
> identifier plane_atomic_func.func;
> identifier plane, state;
> identifier new_state;
> @@
>
> func(struct drm_plane *plane, struct drm_atomic_state *state)
> {
> ...
> - struct drm_plane_state *new_state = plane->state;
> + struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state, plane);
> ...
> }
>
> @ include depends on adds_new_state @
> @@
>
> #include <drm/drm_atomic.h>
>
> @ no_include depends on !include && adds_new_state @
> @@
>
> + #include <drm/drm_atomic.h>
> #include <drm/...>
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
> ---
[snip]
> drivers/gpu/drm/omapdrm/omap_plane.c | 6 ++++--
> drivers/gpu/drm/rcar-du/rcar_du_plane.c | 3 ++-
> drivers/gpu/drm/rcar-du/rcar_du_vsp.c | 3 ++-
> drivers/gpu/drm/xlnx/zynqmp_disp.c | 3 ++-
[snip]
> diff --git a/drivers/gpu/drm/omapdrm/omap_plane.c b/drivers/gpu/drm/omapdrm/omap_plane.c
> index cd8cf7c786b5..021a94de84a1 100644
> --- a/drivers/gpu/drm/omapdrm/omap_plane.c
> +++ b/drivers/gpu/drm/omapdrm/omap_plane.c
> @@ -44,7 +44,8 @@ static void omap_plane_atomic_update(struct drm_plane *plane,
> {
> struct omap_drm_private *priv = plane->dev->dev_private;
> struct omap_plane *omap_plane = to_omap_plane(plane);
> - struct drm_plane_state *new_state = plane->state;
This seems to imply that you're interested in the new state.
> + struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
> + plane);
Does this really make things more obvious ?
> struct omap_overlay_info info;
> int ret;
>
> @@ -89,7 +90,8 @@ static void omap_plane_atomic_update(struct drm_plane *plane,
> static void omap_plane_atomic_disable(struct drm_plane *plane,
> struct drm_atomic_state *state)
> {
> - struct drm_plane_state *new_state = plane->state;
> + struct drm_plane_state *new_state = drm_atomic_get_new_plane_state(state,
> + plane);
> struct omap_drm_private *priv = plane->dev->dev_private;
> struct omap_plane *omap_plane = to_omap_plane(plane);
>
[snip]
--
Regards,
Laurent Pinchart
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