linux-kernel - [PATCH v5 0/6] Add support for new Mali GPUs

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Message-ID: <20250721111344.1610250-1-karunika.choo@arm.com>
Date: Mon, 21 Jul 2025 12:13:38 +0100
From: Karunika Choo <karunika.choo@....com>
To: dri-devel@...ts.freedesktop.org
Cc: nd@....com,
	Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Liviu Dudau <liviu.dudau@....com>,
	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>,
	linux-kernel@...r.kernel.org
Subject: [PATCH v5 0/6] Add support for new Mali GPUs

This patch series introduces some minor refactoring to enable support
for new Mali GPUs.

Key changes:
- Addition of cache maintenance via the FLUSH_CACHES GPU command for all
  supported GPUs in place of FLUSH_MEM and FLUSH_PT MMU_AS commands.
- Added SHAREABLE_CACHE support for GPUs from Mali-Gx20 onwards if
  coherency is enabled.
- Fixed minor issue with the setting of the coherency protocol.

Firmware for these GPUs can be found here:
https://gitlab.com/dliviu/linux-firmware

Patch Breakdown:
[PATCH 1]:   Adds panthor_hw and refactors gpu_info initialization into
             it, laying the foundation for subsequent changes.
[PATCH 2]:   Simplifies the method of determining the GPU model name
             while making it more extensible.
[PATCH 3]:   Adds support for Mali-G710, Mali-G510 and Mali-G310.
[PATCH 4]:   Adds support for Mali-Gx15 GPUs.
[PATCH 5]:   Adds cache maintenance via FLUSH_CACHES GPU command due to
             the deprecation of FLUSH_MEM and FLUSH_PT MMU_AS commands
             from Mali-Gx20 onwards. This feature is extended to all
             previous GPUs as this method of cache maintenance is
             already supported.
[PATCH 6]:   Adds support for Mali-Gx20 and Mali-Gx25 GPUs. This also
             adds SHAREABLE_CACHE support, in addition to fixing a minor
             issue with setting the coherency protocol.

v5:
- Removed all of the GPU-specific initialization boilerplate as it was
  not being used.
- Merged [PATCH 1/7] and [PATCH 2/7] into one.
- Fixed issue with getting model name before the gpu_info struct is
  populated.
- Merged AMBA_FEATURES and AMBA_ENABLE into GPU_COHERENCY_FEATURES and
  GPU_COHERENCY_PROTOCOL registers respectively. Reworked the fields of
  GPU_COHERENCY_FEATURES and added SHAREABLE_CACHE support.
- Link to v4: https://lore.kernel.org/all/20250602143216.2621881-1-karunika.choo@arm.com/
v4:
- Split 64-bit register accessor patches into another patch series.
  - link: https://lore.kernel.org/dri-devel/20250417123725.2733201-1-karunika.choo@arm.com/
- Switched to using arch_major for comparison instead of arch_id in
  panthor_hw.c.
- Removed the gpu_info_init function pointer in favour of a single
  function to handle minor register changes. The function names have
  also been adjusted accordingly.
- Moved the patch to support Mali-G710, Mali-G510 and Mali-G310 forwards
  to [PATCH 4/7].
- Extended support to perform cache maintenance via GPU_CONTROL to
  Mali-Gx10 and Mali-Gx15 GPUs.
- Link to v2: https://lore.kernel.org/all/20250320111741.1937892-1-karunika.choo@arm.com/
v3:
- Kindly ignore this patch series as there were duplicate patches being
  included.
v2:
- Removed handling for register base addresses as they are not yet
  needed.
- Merged gpu_info handling into panthor_hw.c as they depend on the same
  arch_id matching mechanism.
- Made gpu_info initialization a GPU-specific function.
- Removed unnecessary changes for cache maintenance via GPU_CONTROL.
- Removed unnecessary pre-parsing of register fields from v1. Retaining
  current implementation as much as possible.
- Added support for G710, G715, G720, and G725 series of Mali GPUs.
- Link to v1: https://lore.kernel.org/all/20241219170521.64879-1-karunika.choo@arm.com/

Karunika Choo (6):
  drm/panthor: Add panthor_hw and move gpu_info initialization into it
  drm/panthor: Simplify getting the GPU model name
  drm/panthor: Add support for Mali-G710, Mali-G510 and Mali-G310
  drm/panthor: Add support for Mali-Gx15 family of GPUs
  drm/panthor: Make MMU cache maintenance use FLUSH_CACHES command
  drm/panthor: Add support for Mali-Gx20 and Mali-Gx25 GPUs

 drivers/gpu/drm/panthor/Makefile         |   1 +
 drivers/gpu/drm/panthor/panthor_device.c |   7 +-
 drivers/gpu/drm/panthor/panthor_fw.c     |   5 +
 drivers/gpu/drm/panthor/panthor_gpu.c    | 103 ++-----------------
 drivers/gpu/drm/panthor/panthor_hw.c     | 125 +++++++++++++++++++++++
 drivers/gpu/drm/panthor/panthor_hw.h     |  11 ++
 drivers/gpu/drm/panthor/panthor_mmu.c    |  33 ++++++
 drivers/gpu/drm/panthor/panthor_regs.h   |  22 +++-
 include/uapi/drm/panthor_drm.h           |   3 +
 9 files changed, 214 insertions(+), 96 deletions(-)
 create mode 100644 drivers/gpu/drm/panthor/panthor_hw.c
 create mode 100644 drivers/gpu/drm/panthor/panthor_hw.h

-- 
2.49.0