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Thu, 17 Sep 2026 03:49:51 -0700 (PDT) Received: from [192.168.2.3] ([2403:581e:d87e:0:fc2d:ed31:e80e:412d]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39e39bb3f1dsm1062109a91.3.2026.09.17.03.49.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Sep 2026 03:49:51 -0700 (PDT) From: James Calligeros Date: Thu, 17 Sep 2026 20:49:29 +1000 Subject: [PATCH RESEND] drm/fourcc: Add Apple Interchange layout format modifier Precedence: bulk X-Mailing-List: asahi@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260917-apple-interchange-modifier-v1-1-875294689c48@gmail.com> To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, asahi@lists.linux.dev, Oliver Bestmann , sofus , James Calligeros X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=2059; i=jcalligeros99@gmail.com; h=from:subject:message-id; bh=X1GV84Wq/vFzYUv/sfCUjMI1OdVSf5hhLntbftA070c=; b=owGbwMvMwCV2xczoYuD3ygTG02pJDFmrjx7fMcmxc0PVGZ9HIrxaxg9nG8kejncTsVz6OcDp/ Jn8/9vVOiayMIhxMViKKbJsaBLymG3EdrNfpHIvzBxWJpAh0iINDEDAwsCXm5hXaqRjpGeqbahn aKRjrGPEwMUpAFMdFsXIsF1l057fpy2nK83nbVmU9Ex0n02S09e+U2nefeUd59dNymdkmHVg1ZT sJwbz/M/uleJP44+qa6q95nTvsPtND7dLJmuaeAA= X-Developer-Key: i=jcalligeros99@gmail.com; a=openpgp; fpr=B08212489B3206D98F1479BDD43632D151F77960 Apple Interchange is a tiled and compressed image layout used for buffer exchange between Apple hardware blocks. It is similar to the already-supported GPU_TILED_COMPRESSED layout. Add a format modifier for Apple Interchange so that it can be used for buffer exchange. Signed-off-by: James Calligeros --- include/uapi/drm/drm_fourcc.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h index a103fdc0b3a3..aa51c116cd7d 100644 --- a/include/uapi/drm/drm_fourcc.h +++ b/include/uapi/drm/drm_fourcc.h @@ -1626,6 +1626,26 @@ drm_fourcc_canonicalize_nvidia_format_mod(__u64 modifier) #define DRM_FORMAT_MOD_APPLE_GPU_TILED fourcc_mod_code(APPLE, 1) #define DRM_FORMAT_MOD_APPLE_GPU_TILED_COMPRESSED fourcc_mod_code(APPLE, 2) +/* + * Apple Interchange layout + * + * Apple Interchange is a compressed framebuffer format used exclusively for + * sharing buffers between hardware blocks (GPU, display controller, video + * codecs) on Apple platforms. It is similar to and uses the same compression + * scheme as GPU_TILED_COMPRESSED. There is no known uncompressed variant + * of Apple Interchange. + * + * Unlinke the GPU layouts, tile size is not dependent on bit depth. RGB + * images and the chroma components of YUV images use 16x16 tiles. The + * luma component of YUV images uses 32x32 tiles. Compression tiles + * are once again 16x16 with 8 bytes of metadata per compression subtile. + * + * AGX has limited support for Apple Interchange. It cannot be used for Z/S + * buffers or array images, for example. It is intended for scanout buffer + * sharing only. + */ +#define DRM_FORMAT_MOD_APPLE_INTERCHANGE fourcc_mod_code(APPLE, 3) + /* * AMD modifiers * --- base-commit: 08dbfad3f5040f5bdb6c529da20d6d4e81fefd72 change-id: 20260830-apple-interchange-modifier-cbcc311c835d Best regards, -- James Calligeros -- James Calligeros