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Message-ID: <20230602110459.GC26944@pendragon.ideasonboard.com>
Date: Fri, 2 Jun 2023 14:04:59 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Jonathan Corbet <corbet@....net>,
Jyri Sarha <jyri.sarha@....fi>,
Tomi Valkeinen <tomba@...nel.org>,
Biju Das <biju.das.jz@...renesas.com>,
dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org,
linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] drm: Remove references to removed transitional
helpers
Hi Geert,
Thank you for the patch.
On Fri, Jun 02, 2023 at 11:11:35AM +0200, Geert Uytterhoeven wrote:
> The transitional helpers were removed a long time ago, but some
> references stuck. Remove them.
>
> Fixes: 21ebe615c16994f3 ("drm: Remove transitional helpers")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> It doesn't look like the drm_encoder_helper_funcs were ever used by the
> transitional plane helpers?
> ---
> drivers/gpu/drm/drm_plane_helper.c | 8 ----
> include/drm/drm_crtc.h | 5 ---
> include/drm/drm_modeset_helper_vtables.h | 48 +++++++++++-------------
> 3 files changed, 21 insertions(+), 40 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_plane_helper.c b/drivers/gpu/drm/drm_plane_helper.c
> index c91e454eba097942..be45bdb58d849653 100644
> --- a/drivers/gpu/drm/drm_plane_helper.c
> +++ b/drivers/gpu/drm/drm_plane_helper.c
> @@ -51,14 +51,6 @@
> * planes, and newly merged drivers must not rely upon these transitional
> * helpers.
> *
The first paragraph starts with "This helper library has two parts.". As
you're dropping the mention of the second part, I think you should
rework the first paragraph too.
> - * The second part also implements transitional helpers which allow drivers to
> - * gradually switch to the atomic helper infrastructure for plane updates. Once
> - * that switch is complete drivers shouldn't use these any longer, instead using
> - * the proper legacy implementations for update and disable plane hooks provided
> - * by the atomic helpers.
> - *
> - * Again drivers are strongly urged to switch to the new interfaces.
> - *
> * The plane helpers share the function table structures with other helpers,
> * specifically also the atomic helpers. See &struct drm_plane_helper_funcs for
> * the details.
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index 8e1cbc75143ef216..8b48a1974da3143c 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -77,11 +77,6 @@ struct drm_plane_helper_funcs;
> * intended to indicate whether a full modeset is needed, rather than strictly
> * describing what has changed in a commit. See also:
> * drm_atomic_crtc_needs_modeset()
> - *
> - * WARNING: Transitional helpers (like drm_helper_crtc_mode_set() or
> - * drm_helper_crtc_mode_set_base()) do not maintain many of the derived control
> - * state like @plane_mask so drivers not converted over to atomic helpers should
> - * not rely on these being accurate!
> */
> struct drm_crtc_state {
> /** @crtc: backpointer to the CRTC */
> diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
> index 965faf082a6d1acb..e3c3ac615909474b 100644
> --- a/include/drm/drm_modeset_helper_vtables.h
> +++ b/include/drm/drm_modeset_helper_vtables.h
> @@ -59,8 +59,8 @@ enum mode_set_atomic {
> /**
> * struct drm_crtc_helper_funcs - helper operations for CRTCs
> *
> - * These hooks are used by the legacy CRTC helpers, the transitional plane
> - * helpers and the new atomic modesetting helpers.
> + * These hooks are used by the legacy CRTC helpers and the new atomic
> + * modesetting helpers.
> */
> struct drm_crtc_helper_funcs {
> /**
> @@ -216,9 +216,7 @@ struct drm_crtc_helper_funcs {
> *
> * This callback is used to update the display mode of a CRTC without
> * changing anything of the primary plane configuration. This fits the
> - * requirement of atomic and hence is used by the atomic helpers. It is
> - * also used by the transitional plane helpers to implement a
> - * @mode_set hook in drm_helper_crtc_mode_set().
> + * requirement of atomic and hence is used by the atomic helpers.
> *
> * Note that the display pipe is completely off when this function is
> * called. Atomic drivers which need hardware to be running before they
> @@ -333,8 +331,8 @@ struct drm_crtc_helper_funcs {
> * all updated. Again the recommendation is to just call check helpers
> * until a maximal configuration is reached.
> *
> - * This callback is used by the atomic modeset helpers and by the
> - * transitional plane helpers, but it is optional.
> + * This callback is used by the atomic modeset helpers, but it is
> + * optional.
> *
> * NOTE:
> *
> @@ -373,8 +371,8 @@ struct drm_crtc_helper_funcs {
> * has picked. See drm_atomic_helper_commit_planes() for a discussion of
> * the tradeoffs and variants of plane commit helpers.
> *
> - * This callback is used by the atomic modeset helpers and by the
> - * transitional plane helpers, but it is optional.
> + * This callback is used by the atomic modeset helpers, but it is
> + * optional.
> */
> void (*atomic_begin)(struct drm_crtc *crtc,
> struct drm_atomic_state *state);
> @@ -397,8 +395,8 @@ struct drm_crtc_helper_funcs {
> * has picked. See drm_atomic_helper_commit_planes() for a discussion of
> * the tradeoffs and variants of plane commit helpers.
> *
> - * This callback is used by the atomic modeset helpers and by the
> - * transitional plane helpers, but it is optional.
> + * This callback is used by the atomic modeset helpers, but it is
> + * optional.
> */
> void (*atomic_flush)(struct drm_crtc *crtc,
> struct drm_atomic_state *state);
> @@ -507,8 +505,8 @@ static inline void drm_crtc_helper_add(struct drm_crtc *crtc,
> /**
> * struct drm_encoder_helper_funcs - helper operations for encoders
> *
> - * These hooks are used by the legacy CRTC helpers, the transitional plane
> - * helpers and the new atomic modesetting helpers.
> + * These hooks are used by the legacy CRTC helpers and the new atomic
> + * modesetting helpers.
> */
> struct drm_encoder_helper_funcs {
> /**
> @@ -1185,8 +1183,7 @@ static inline void drm_connector_helper_add(struct drm_connector *connector,
> /**
> * struct drm_plane_helper_funcs - helper operations for planes
> *
> - * These functions are used by the atomic helpers and by the transitional plane
> - * helpers.
> + * These functions are used by the atomic helpers.
> */
> struct drm_plane_helper_funcs {
> /**
> @@ -1221,9 +1218,8 @@ struct drm_plane_helper_funcs {
> * The helpers will call @cleanup_fb with matching arguments for every
> * successful call to this hook.
> *
> - * This callback is used by the atomic modeset helpers and by the
> - * transitional plane helpers, but it is optional. See @begin_fb_access
> - * for preparing per-commit resources.
> + * This callback is used by the atomic modeset helpers, but it is
> + * optional. See @begin_fb_access for preparing per-commit resources.
> *
> * RETURNS:
> *
> @@ -1240,8 +1236,8 @@ struct drm_plane_helper_funcs {
> * This hook is called to clean up any resources allocated for the given
> * framebuffer and plane configuration in @prepare_fb.
> *
> - * This callback is used by the atomic modeset helpers and by the
> - * transitional plane helpers, but it is optional.
> + * This callback is used by the atomic modeset helpers, but it is
> + * optional.
> */
> void (*cleanup_fb)(struct drm_plane *plane,
> struct drm_plane_state *old_state);
> @@ -1295,8 +1291,8 @@ struct drm_plane_helper_funcs {
> * all updated. Again the recommendation is to just call check helpers
> * until a maximal configuration is reached.
> *
> - * This callback is used by the atomic modeset helpers and by the
> - * transitional plane helpers, but it is optional.
> + * This callback is used by the atomic modeset helpers, but it is
> + * optional.
> *
> * NOTE:
> *
> @@ -1326,8 +1322,7 @@ struct drm_plane_helper_funcs {
> * has picked. See drm_atomic_helper_commit_planes() for a discussion of
> * the tradeoffs and variants of plane commit helpers.
> *
> - * This callback is used by the atomic modeset helpers and by the
> - * transitional plane helpers, but it is optional.
> + * This callback is used by the atomic modeset helpers, but it is optional.
> */
> void (*atomic_update)(struct drm_plane *plane,
> struct drm_atomic_state *state);
> @@ -1376,9 +1371,8 @@ struct drm_plane_helper_funcs {
> * has picked. See drm_atomic_helper_commit_planes() for a discussion of
> * the tradeoffs and variants of plane commit helpers.
> *
> - * This callback is used by the atomic modeset helpers and by the
> - * transitional plane helpers, but it is optional. It's intended to
> - * reverse the effects of @atomic_enable.
> + * This callback is used by the atomic modeset helpers, but it is
> + * optional. It's intended to reverse the effects of @atomic_enable.
> */
> void (*atomic_disable)(struct drm_plane *plane,
> struct drm_atomic_state *state);
--
Regards,
Laurent Pinchart
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