linux-kernel - [PATCH RFC v2 12/20] drm/crtc: Track post-blend color pipeline client cap in drm_crtc

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Message-Id: <20250917-mtk-post-blend-color-pipeline-v2-12-ac4471b44758@collabora.com>
Date: Wed, 17 Sep 2025 20:43:21 -0400
From: Nícolas F. R. A. Prado <nfraprado@...labora.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Chun-Kuang Hu <chunkuang.hu@...nel.org>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Haneen Mohammed <hamohammed.sa@...il.com>, 
 Melissa Wen <melissa.srw@...il.com>
Cc: Alex Hung <alex.hung@....com>, wayland-devel@...ts.freedesktop.org, 
 harry.wentland@....com, leo.liu@....com, ville.syrjala@...ux.intel.com, 
 pekka.paalanen@...labora.com, contact@...rsion.fr, mwen@...lia.com, 
 jadahl@...hat.com, sebastian.wick@...hat.com, shashank.sharma@....com, 
 agoins@...dia.com, joshua@...ggi.es, mdaenzer@...hat.com, aleixpol@....org, 
 xaver.hugl@...il.com, victoria@...tem76.com, uma.shankar@...el.com, 
 quic_naseer@...cinc.com, quic_cbraga@...cinc.com, quic_abhinavk@...cinc.com, 
 marcan@...can.st, Liviu.Dudau@....com, sashamcintosh@...gle.com, 
 chaitanya.kumar.borah@...el.com, louis.chauvet@...tlin.com, 
 mcanal@...lia.com, kernel@...labora.com, daniels@...labora.com, 
 leandro.ribeiro@...labora.com, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org, 
 linux-arm-kernel@...ts.infradead.org, 
 Nícolas F. R. A. Prado <nfraprado@...labora.com>, 
 Simona Vetter <simona.vetter@...ll.ch>
Subject: [PATCH RFC v2 12/20] drm/crtc: Track post-blend color pipeline
 client cap in drm_crtc_state

Some drivers, like VKMS, only have access to the drm_crtc_state but not
the drm_atomic_state during composition of the output framebuffer. Store
the state of the post-blend color pipeline client cap in the
drm_crtc_state so those drivers can decide whether to look at the color
pipeline or the legacy properties for the color management settings to
apply.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
---
 drivers/gpu/drm/drm_atomic.c | 1 +
 include/drm/drm_crtc.h       | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 6982c978dc530b838353ace60f748660c3b4524d..bbfa35c800240722785a6db440eb3d47ef9c8ed6 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -386,6 +386,7 @@ drm_atomic_get_crtc_state(struct drm_atomic_state *state,
 	state->crtcs[index].new_state = crtc_state;
 	state->crtcs[index].ptr = crtc;
 	crtc_state->state = state;
+	crtc_state->color_pipeline_enabled = state->post_blend_color_pipeline;

 	drm_dbg_atomic(state->dev, "Added [CRTC:%d:%s] %p state to %p\n",
 		       crtc->base.id, crtc->name, crtc_state, state);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index df03637ca25abd45e96b5944229297f776fd046d..cb9eda6335e0d6728d99d67cc6916ad2d0e1d94e 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -282,6 +282,14 @@ struct drm_crtc_state {
 	 */
 	struct drm_colorop *color_pipeline;

+	/**
+	 * @color_pipeline_enabled:
+	 *
+	 * Whether color management should be done based on the &color_pipeline
+	 * or the legacy color properties (&ctm, &gamma_lut and &degamma_lut).
+	 */
+	bool color_pipeline_enabled;
+
 	/**
 	 * @target_vblank:
 	 *

-- 
2.50.1