kernel/linux.git/drivers/accel/ethosu, branch v6.19.11

accel: ethosu: Fix NPU_OP_ELEMENTWISE validation with scalar

2026-03-12T11:10:00+00:00

[ Upstream commit 838ae99f9a77a5724ee6d4e7b7b1eb079147f888 ] The NPU_OP_ELEMENTWISE instruction uses a scalar value for IFM2 if the IFM2_BROADCAST "scalar" mode is set. It is a bit (7) on the u65 and part of a field (bits 3:0) on the u85. The driver was hardcoded to the u85. Fixes: 5a5e9c0228e6 ("accel: Add Arm Ethos-U NPU driver") Reviewed-and-Tested-by: Anders Roxell Link: https://patch.msgid.link/20260218-ethos-fixes-v1-2-be3fa3ea9a30@kernel.org Signed-off-by: Rob Herring (Arm) Signed-off-by: Sasha Levin

accel: ethosu: Fix job submit error clean-up refcount underflows

2026-03-12T11:10:00+00:00

[ Upstream commit 150bceb3e0a4a30950279d91ea0e8cc69a736742 ] If the job submit fails before adding the job to the scheduler queue such as when the GEM buffer bounds checks fail, then doing a ethosu_job_put() results in a pm_runtime_put_autosuspend() without the corresponding pm_runtime_resume_and_get(). The dma_fence_put()'s are also unnecessary, but seem to be harmless. Split the ethosu_job_cleanup() function into 2 parts for the before and after the job is queued. Fixes: 5a5e9c0228e6 ("accel: Add Arm Ethos-U NPU driver") Reviewed-and-Tested-by: Anders Roxell Link: https://patch.msgid.link/20260218-ethos-fixes-v1-1-be3fa3ea9a30@kernel.org Signed-off-by: Rob Herring (Arm) Signed-off-by: Sasha Levin

accel: ethosu: Fix shift overflow in cmd_to_addr()

2026-03-12T11:09:08+00:00

[ Upstream commit 7be41fb00e2c2a823f271a8318b453ca11812f1e ] The "((cmd[0] & 0xff0000) << 16)" shift is zero. This was intended to be (((u64)cmd[0] & 0xff0000) << 16). Move the cast to the correct location. Fixes: 5a5e9c0228e6 ("accel: Add Arm Ethos-U NPU driver") Signed-off-by: Dan Carpenter Link: https://patch.msgid.link/aQGmY64tWcwOGFP4@stanley.mountain Signed-off-by: Rob Herring (Arm) Signed-off-by: Sasha Levin

drm: include drm_print.h where needed

2025-10-31T08:34:52+00:00

There are a gazillion files that depend on drm_print.h being indirectly included via drm_buddy.h, drm_mm.h, or ttm/ttm_resource.h. In preparation for removing those includes, explicitly include drm_print.h where needed. Cc: Thomas Zimmermann Reviewed-by: Thomas Zimmermann Signed-off-by: Jani Nikula Link: https://lore.kernel.org/r/5fe67395907be33eb5199ea6d540e29fddee71c8.1761734313.git.jani.nikula@intel.com

accel: Add Arm Ethos-U NPU driver

2025-10-24T20:07:39+00:00

Add a driver for Arm Ethos-U65/U85 NPUs. The Ethos-U NPU has a relatively simple interface with single command stream to describe buffers, operation settings, and network operations. It supports up to 8 memory regions (though no h/w bounds on a region). The Ethos NPUs are designed to use an SRAM for scratch memory. Region 2 is reserved for SRAM (like the downstream driver stack and compiler). Userspace doesn't need access to the SRAM. The h/w has no MMU nor external IOMMU and is a DMA engine which can read and write anywhere in memory without h/w bounds checks. The user submitted command streams must be validated against the bounds of the GEM BOs. This is similar to the VC4 design which validates shaders. The job submit is based on the rocket driver for the Rockchip NPU utilizing the GPU scheduler. It is simpler as there's only 1 core rather than 3. Tested on i.MX93 platform (U65) and FVP (U85) with Mesa Teflon support. Acked-by: Thomas Zimmermann Acked-by: Tomeu Vizoso Reviewed-by: Frank Li Link: https://patch.msgid.link/20251020-ethos-v6-2-ecebc383c4b7@kernel.org Signed-off-by: Rob Herring (Arm)