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Message-ID: <f644c43e-0c84-d7e3-90af-af269e9eb6e2@suse.de>
Date: Tue, 13 Sep 2022 17:15:42 +0200
From: Thomas Zimmermann <tzimmermann@...e.de>
To: Harry Wentland <harry.wentland@....com>,
Javier Martinez Canillas <javierm@...hat.com>,
linux-kernel@...r.kernel.org
Cc: David Airlie <airlied@...ux.ie>, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2] drm/plane-helper: Add a
drm_plane_helper_atomic_check() helper
Hi
Am 13.09.22 um 15:49 schrieb Harry Wentland:
>
>
> On 2022-09-13 05:33, Javier Martinez Canillas wrote:
>> Provides a default plane state check handler for primary planes that are a
>> fullscreen scanout buffer and whose state scale and position can't change.
>>
>
> Even though this might be how some drivers are handling the primary
> plane this assumption is not universal. For example, on ChromeOS when
> the (default) underlay strategy is selected the compositor will
> position the video plane as the bottom-most plane and mark it
> as primary, while the desktop plane is marked as overlay and
> will contain an alpha cutout to show the underlying video.
>
> In this case the video plane (primary) won't span the screen
> and is regularly panned and resized.
>
> No objections to this change as it helps share code between drivers,
> but maybe specify that this behavior is a unique requirement of
> these drivers.
>
> Harry
>
>> There are some drivers that duplicate this logic in their helpers, such as
>> simpledrm and ssd130x. Factor out this common code into a plane helper and
>> make drivers use it.
>>
>> Suggested-by: Thomas Zimmermann <tzimmermann@...e.de>
>> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
>> ---
>>
>> Changes in v2:
>> - Fix `new_state` field comment (Ville Syrjälä).
>> - Rename `new_state` to just `state` (Ville Syrjälä).
>>
>> drivers/gpu/drm/drm_plane_helper.c | 28 ++++++++++++++++++++++++++++
>> drivers/gpu/drm/solomon/ssd130x.c | 18 +-----------------
>> drivers/gpu/drm/tiny/simpledrm.c | 25 +------------------------
>> include/drm/drm_plane_helper.h | 1 +
>> 4 files changed, 31 insertions(+), 41 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
>> index c7785967f5bf..2165390863f4 100644
>> --- a/drivers/gpu/drm/drm_plane_helper.c
>> +++ b/drivers/gpu/drm/drm_plane_helper.c
>> @@ -278,3 +278,31 @@ void drm_plane_helper_destroy(struct drm_plane *plane)
>> kfree(plane);
>> }
>> EXPORT_SYMBOL(drm_plane_helper_destroy);
>> +
>> +/**
>> + * drm_plane_helper_atomic_check() - Helper to check primary planes states
>> + * @plane: plane to check
>> + * @state: atomic state object
>> + *
>> + * Provides a default plane state check handler for primary planes whose atomic
'plane-state'
'atomic-state scale and positioning properties are not expected to change'
>> + * state scale and position is not expected to change because the primary plane
>> + * is always a fullscreen scanout buffer.
AFAICT the docs clearly state the purpose of the helper. Maybe say
'plane' instead of 'primary plane' in the docs and add a sentence like
'This is often the case for the primary plane of simple framebuffers.'
Reviewed-by: Thomas Zimmermann <tzimmermann@...e.de>
Best regards
Thomas
>> + *
>> + * RETURNS:
>> + * Zero on success, or an errno code otherwise.
>> + */
>> +int drm_plane_helper_atomic_check(struct drm_plane *plane, struct drm_atomic_state *state)
>> +{
>> + struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
>> + struct drm_crtc *new_crtc = new_plane_state->crtc;
>> + struct drm_crtc_state *new_crtc_state = NULL;
>> +
>> + if (new_crtc)
>> + new_crtc_state = drm_atomic_get_new_crtc_state(state, new_crtc);
>> +
>> + return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
>> + DRM_PLANE_NO_SCALING,
>> + DRM_PLANE_NO_SCALING,
>> + false, false);
>> +}
>> +EXPORT_SYMBOL(drm_plane_helper_atomic_check);
>> diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c
>> index 79e8e2017c68..28cf9c87f86d 100644
>> --- a/drivers/gpu/drm/solomon/ssd130x.c
>> +++ b/drivers/gpu/drm/solomon/ssd130x.c
>> @@ -565,22 +565,6 @@ static int ssd130x_fb_blit_rect(struct drm_framebuffer *fb, const struct iosys_m
>> return ret;
>> }
>>
>> -static int ssd130x_primary_plane_helper_atomic_check(struct drm_plane *plane,
>> - struct drm_atomic_state *new_state)
>> -{
>> - struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(new_state, plane);
>> - struct drm_crtc *new_crtc = new_plane_state->crtc;
>> - struct drm_crtc_state *new_crtc_state = NULL;
>> -
>> - if (new_crtc)
>> - new_crtc_state = drm_atomic_get_new_crtc_state(new_state, new_crtc);
>> -
>> - return drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
>> - DRM_PLANE_NO_SCALING,
>> - DRM_PLANE_NO_SCALING,
>> - false, false);
>> -}
>> -
>> static void ssd130x_primary_plane_helper_atomic_update(struct drm_plane *plane,
>> struct drm_atomic_state *old_state)
>> {
>> @@ -623,7 +607,7 @@ static void ssd130x_primary_plane_helper_atomic_disable(struct drm_plane *plane,
>>
>> static const struct drm_plane_helper_funcs ssd130x_primary_plane_helper_funcs = {
>> DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
>> - .atomic_check = ssd130x_primary_plane_helper_atomic_check,
>> + .atomic_check = drm_plane_helper_atomic_check,
>> .atomic_update = ssd130x_primary_plane_helper_atomic_update,
>> .atomic_disable = ssd130x_primary_plane_helper_atomic_disable,
>> };
>> diff --git a/drivers/gpu/drm/tiny/simpledrm.c b/drivers/gpu/drm/tiny/simpledrm.c
>> index 777ccd250871..ea5b3239a659 100644
>> --- a/drivers/gpu/drm/tiny/simpledrm.c
>> +++ b/drivers/gpu/drm/tiny/simpledrm.c
>> @@ -469,29 +469,6 @@ static const uint64_t simpledrm_primary_plane_format_modifiers[] = {
>> DRM_FORMAT_MOD_INVALID
>> };
>>
>> -static int simpledrm_primary_plane_helper_atomic_check(struct drm_plane *plane,
>> - struct drm_atomic_state *new_state)
>> -{
>> - struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(new_state, plane);
>> - struct drm_crtc *new_crtc = new_plane_state->crtc;
>> - struct drm_crtc_state *new_crtc_state = NULL;
>> - int ret;
>> -
>> - if (new_crtc)
>> - new_crtc_state = drm_atomic_get_new_crtc_state(new_state, new_crtc);
>> -
>> - ret = drm_atomic_helper_check_plane_state(new_plane_state, new_crtc_state,
>> - DRM_PLANE_NO_SCALING,
>> - DRM_PLANE_NO_SCALING,
>> - false, false);
>> - if (ret)
>> - return ret;
>> - else if (!new_plane_state->visible)
>> - return 0;
>> -
>> - return 0;
>> -}
>> -
>> static void simpledrm_primary_plane_helper_atomic_update(struct drm_plane *plane,
>> struct drm_atomic_state *old_state)
>> {
>> @@ -543,7 +520,7 @@ static void simpledrm_primary_plane_helper_atomic_disable(struct drm_plane *plan
>>
>> static const struct drm_plane_helper_funcs simpledrm_primary_plane_helper_funcs = {
>> DRM_GEM_SHADOW_PLANE_HELPER_FUNCS,
>> - .atomic_check = simpledrm_primary_plane_helper_atomic_check,
>> + .atomic_check = drm_plane_helper_atomic_check,
>> .atomic_update = simpledrm_primary_plane_helper_atomic_update,
>> .atomic_disable = simpledrm_primary_plane_helper_atomic_disable,
>> };
>> diff --git a/include/drm/drm_plane_helper.h b/include/drm/drm_plane_helper.h
>> index 1781fab24dd6..7760b27b0323 100644
>> --- a/include/drm/drm_plane_helper.h
>> +++ b/include/drm/drm_plane_helper.h
>> @@ -41,5 +41,6 @@ int drm_plane_helper_update_primary(struct drm_plane *plane, struct drm_crtc *cr
>> int drm_plane_helper_disable_primary(struct drm_plane *plane,
>> struct drm_modeset_acquire_ctx *ctx);
>> void drm_plane_helper_destroy(struct drm_plane *plane);
>> +int drm_plane_helper_atomic_check(struct drm_plane *plane, struct drm_atomic_state *state);
>>
>> #endif
>
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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