This patch series adds support for the MediaTek Video Companion Processor (VCP), a RISC-V based coprocessor found on MediaTek SoCs starting from mt8196. The VCP handles video processing and multimedia tasks, offloading work from the main CPU cores.
Architecture Overview ===================== The VCP subsystem consists of several components: 1. Hardware Architecture - RISC-V coprocessor with 1-2 harts per core - Multi-core capable (mt8196 has 2 VCP cores) - Shared SRAM (up to 384KB) partitioned among cores - Dedicated power domain for power management - Integrated with SoC IOMMU for memory protection 2. Communication Infrastructure - 5 hardware mailbox channels for IPI (Inter-Processor Interrupt) - Shared memory regions for bulk data transfer - IPI routing tables mapping message types to mailboxes - Support for both blocking and non-blocking IPI operations 3. Boot and Runtime Management - Firmware loaded via remoteproc framework from filesystem - Boot sequence coordinated with ARM Trusted Firmware (ATF) via SMC - Runtime power management with suspend/resume support - Feature registration mechanism for cross-subsystem coordination Patch Series Structure ====================== [PATCH 1/7] dt-bindings: Device tree binding for mt8196 VCP [PATCH 2/7] remoteproc: Core VCP remoteproc driver with ATF integration [PATCH 3/7] firmware: IPC protocol layer for VCP communication [PATCH 4/7] remoteproc: IPI mailbox initialization and routing [PATCH 5/7] remoteproc: IPI synchronization mechanism [PATCH 6/7] remoteproc: Suspend/resume power management [PATCH 7/7] MAINTAINERS: Add maintainer entry Differences from MediaTek SCP ============================== MediaTek SoCs have two types of companion processors: - SCP (System Companion Processor): Cortex-M based, for system tasks - VCP (Video Companion Processor): RISC-V based, for multimedia While both use the remoteproc framework, VCP has distinct characteristics: - Different ISA (RISC-V vs ARM Cortex-M) - Different firmware and memory layout - Different IPC protocol (5 mailboxes vs 1) - ATF-coordinated boot sequence - Multi-core capable architecture Testing ======= This patch series has been tested on mt8196 development boards with: - Firmware loading and boot sequence verification - IPI communication with video encoder/decoder subsystems - Suspend/resume cycles with multimedia workloads active - Multi-core VCP configuration - IOMMU integration with multimedia memory management Dependencies ============ - Mediatek Power management driver - MediaTek VCP mailbox driver (MTK_VCP_MBOX) - ARM SMCCC support for ATF communication - IOMMU support for memory protection Checkpatch Status ================= All patches pass checkpatch.pl with no errors. Warnings about MAINTAINERS are addressed in the final patch of the series. Future Work =========== - Support for additional SoC variants (mt8197, mt8198) - Enhanced debugging infrastructure (trace, core dump) - Performance optimizations for IPI latency - Documentation under Documentation/remoteproc/ Xiangzhi Tang (7): dt-bindings: remoteproc: Add MediaTek mt8196 VCP binding remoteproc: mediatek: Add VCP remoteproc driver firmware: mediatek: Add VCP IPC protocol driver remoteproc: mediatek: Add VCP IPI mailbox initialization remoteproc: mediatek: Add VCP ipi communication sync mechanism remoteproc: mediatek: vcp: Add vcp suspend and resume feature MAINTAINERS: Add entry for MediaTek VCP remoteproc driver .../bindings/remoteproc/mediatek,mt8196-vcp.yaml | 166 ++++ MAINTAINERS | 14 + drivers/firmware/Kconfig | 9 + drivers/firmware/Makefile | 1 + drivers/firmware/mtk-vcp-ipc.c | 481 +++++++++++ drivers/remoteproc/Kconfig | 12 + drivers/remoteproc/Makefile | 3 + drivers/remoteproc/mtk_vcp_common.c | 881 +++++++++++++++++++++ drivers/remoteproc/mtk_vcp_common.h | 281 +++++++ drivers/remoteproc/mtk_vcp_rproc.c | 581 ++++++++++++++ drivers/remoteproc/mtk_vcp_rproc.h | 95 +++ include/linux/firmware/mediatek/mtk-vcp-ipc.h | 151 ++++ include/linux/remoteproc/mtk_vcp_public.h | 146 ++++ include/linux/soc/mediatek/mtk_sip_svc.h | 2 + 14 files changed, 2823 insertions(+) create mode 100644 Documentation/devicetree/bindings/remoteproc/mediatek,mt8196-vcp.yaml create mode 100644 drivers/firmware/mtk-vcp-ipc.c create mode 100644 drivers/remoteproc/mtk_vcp_common.c create mode 100644 drivers/remoteproc/mtk_vcp_common.h create mode 100644 drivers/remoteproc/mtk_vcp_rproc.c create mode 100644 drivers/remoteproc/mtk_vcp_rproc.h create mode 100644 include/linux/firmware/mediatek/mtk-vcp-ipc.h create mode 100644 include/linux/remoteproc/mtk_vcp_public.h -- 2.46.0
