linux-kernel - [PATCH] drm: add modifiers for MediaTek tiled formats

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Message-Id: <20241213184705.317138-1-eric.smith@collabora.com>
Date: Fri, 13 Dec 2024 14:47:05 -0400
From: eric.smith@...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>
Cc: kernel@...labora.com,
	"Eric R. Smith" <eric.smith@...labora.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm: add modifiers for MediaTek tiled formats

From: "Eric R. Smith" <eric.smith@...labora.com>

MediaTek (MTK) uses some unique tiled memory formats
for video decoding. Add these to the uapi drm_fourcc.h
so that we can use them in Mesa, GStreamer, and other
tools/libraries.

Signed-off-by: Eric R. Smith <eric.smith@...labora.com>
---
 include/uapi/drm/drm_fourcc.h | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index 70f3b00b0681..22a27cdd6484 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -421,6 +421,7 @@ extern "C" {
 #define DRM_FORMAT_MOD_VENDOR_ARM     0x08
 #define DRM_FORMAT_MOD_VENDOR_ALLWINNER 0x09
 #define DRM_FORMAT_MOD_VENDOR_AMLOGIC 0x0a
+#define DRM_FORMAT_MOD_VENDOR_MTK     0x0b
 
 /* add more to the end as needed */
 
@@ -1453,6 +1454,36 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier)
  */
 #define AMLOGIC_FBC_OPTION_MEM_SAVING		(1ULL << 0)
 
+/* MediaTek layouts */
+
+/*
+ * MediaTek Tiled Modifier
+ * This is a tiled layout using tiles of 16x32 pixels in a row-major layout.
+ * For chroma planes this becomes 16x16 tiles.
+ */
+#define DRM_FORMAT_MOD_MTK_16L_32S_TILE  fourcc_mod_code(MTK, (1ULL << 0))
+
+/*
+ * MediaTek Compressed Modifier
+ * Indicates the planes are compressed.
+ * Implementation may be platform and base-format specific.
+ */
+#define DRM_FORMAT_MOD_MTK_COMPRESSED  fourcc_mod_code(MTK, (1ULL << 1))
+
+/*
+ * MediaTek 10-bit Modifier
+ * Indicates that the 2 LSBs of the 10 bit pixels are stored
+ * separately and tiled.
+ */
+#define DRM_FORMAT_MOD_MTK_LSBTILED    fourcc_mod_code(MTK, (1ULL << 2))
+
+/*
+ * MediaTek 10-bit Modifier
+ * Indicates that the 2 LSBs of 10 bit pixels are stored
+ * separately in raster order.
+ */
+#define DRM_FORMAT_MOD_MTK_LSBRASTER   fourcc_mod_code(MTK, (1ULL << 3))
+
 /*
  * AMD modifiers
  *

base-commit: 3a8e60188b55f7aff76c1d3707ebcbf98e68cc13
-- 
2.39.5