linux-kernel - [PATCH v3 05/21] drm: Introduce DRM_CAP_CRTC_COLOR

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Message-Id: <20251223-mtk-post-blend-color-pipeline-v3-5-7d969f9a37a0@collabora.com>
Date: Tue, 23 Dec 2025 15:01:25 -0300
From: Ariel D'Alessandro <ariel.dalessandro@...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>, 
 Louis Chauvet <louis.chauvet@...tlin.com>, 
 Haneen Mohammed <hamohammed.sa@...il.com>, 
 Melissa Wen <melissa.srw@...il.com>
Cc: dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
 kernel@...labora.com, 
 Nícolas F. R. A. Prado <nfraprado@...labora.com>, 
 Ariel D'Alessandro <ariel.dalessandro@...labora.com>
Subject: [PATCH v3 05/21] drm: Introduce DRM_CAP_CRTC_COLOR_PIPELINE

From: "Nícolas F. R. A. Prado" <nfraprado@...labora.com>

Add a new cap that drivers can set to signal they support CRTC (a.k.a.
post-blend) color pipelines.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>
Co-developed-by: Ariel D'Alessandro <ariel.dalessandro@...labora.com>
Signed-off-by: Ariel D'Alessandro <ariel.dalessandro@...labora.com>
Reviewed-by: Louis Chauvet <louis.chauvet@...tlin.com>
---
 drivers/gpu/drm/drm_ioctl.c | 3 +++
 include/drm/drm_drv.h       | 6 ++++++
 include/uapi/drm/drm.h      | 6 ++++++
 3 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c
index ff193155129e7..2884075660ddd 100644
--- a/drivers/gpu/drm/drm_ioctl.c
+++ b/drivers/gpu/drm/drm_ioctl.c
@@ -304,6 +304,9 @@ static int drm_getcap(struct drm_device *dev, void *data, struct drm_file *file_
 		req->value = drm_core_check_feature(dev, DRIVER_ATOMIC) &&
 			     dev->mode_config.async_page_flip;
 		break;
+	case DRM_CAP_CRTC_COLOR_PIPELINE:
+		req->value = drm_core_check_feature(dev, DRIVER_CRTC_COLOR_PIPELINE);
+		break;
 	default:
 		return -EINVAL;
 	}
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index 42fc085f986de..2a57c50b4223e 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -122,6 +122,12 @@ enum drm_driver_feature {
 	 * the cursor planes to work correctly).
 	 */
 	DRIVER_CURSOR_HOTSPOT           = BIT(9),
+	/**
+	 * @DRIVER_CRTC_COLOR_PIPELINE:
+	 *
+	 * Driver supports CRTC (post-blend) color pipeline.
+	 */
+	DRIVER_CRTC_COLOR_PIPELINE	= BIT(10),

 	/* IMPORTANT: Below are all the legacy flags, add new ones above. */

diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index 27cc159c1d275..d726828bdf408 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -812,6 +812,12 @@ struct drm_gem_change_handle {
  * commits.
  */
 #define DRM_CAP_ATOMIC_ASYNC_PAGE_FLIP	0x15
+/**
+ * DRM_CAP_CRTC_COLOR_PIPELINE
+ *
+ * If set to 1, the driver supports CRTC (post-blend) color pipelines.
+ */
+#define DRM_CAP_CRTC_COLOR_PIPELINE	0x16

 /* DRM_IOCTL_GET_CAP ioctl argument type */
 struct drm_get_cap {

-- 
2.51.0