[PATCH v2 0/7] Add dts for mt8183 GPU (and misc panfrost patches)

[Nicolas Boichat <drinkcat@chromium.org>]

Hi!

Sorry for the long delay since https://patchwork.kernel.org/patch/11132381/,
finally got around to give this a real try.

The main purpose of this series is to upstream the dts change and the binding
document, but I wanted to see how far I could probe the GPU, to check that the
binding is indeed correct. The rest of the patches are RFC/work-in-progress, but
I think some of them could already be picked up.

So this is tested on MT8183 with a chromeos-4.19 kernel, and a ton of
backports to get the latest panfrost driver (I should probably try on
linux-next at some point but this was the path of least resistance).

I tested it as a module as it's more challenging (originally probing would
work built-in, on boot, but not as a module, as I didn't have the power
domain changes, and all power domains are on by default during boot).

Probing logs looks like this, currently:
[  221.867726] panfrost 13040000.gpu: clock rate = 511999970
[  221.867929] panfrost 13040000.gpu: Linked as a consumer to regulator.14
[  221.868600] panfrost 13040000.gpu: Linked as a consumer to regulator.31
[  221.870586] panfrost 13040000.gpu: Linked as a consumer to genpd:0:13040000.gpu
[  221.871492] panfrost 13040000.gpu: Linked as a consumer to genpd:1:13040000.gpu
[  221.871866] panfrost 13040000.gpu: Linked as a consumer to genpd:2:13040000.gpu
[  221.872427] panfrost 13040000.gpu: mali-g72 id 0x6221 major 0x0 minor 0x3 status 0x0
[  221.872439] panfrost 13040000.gpu: features: 00000000,13de77ff, issues: 00000000,00000400
[  221.872445] panfrost 13040000.gpu: Features: L2:0x07120206 Shader:0x00000000 Tiler:0x00000809 Mem:0x1 MMU:0x00002830 AS:0xff JS:0x7
[  221.872449] panfrost 13040000.gpu: shader_present=0x7 l2_present=0x1
[  221.873526] panfrost 13040000.gpu: error powering up gpu stack
[  221.878088] [drm] Initialized panfrost 1.1.0 20180908 for 13040000.gpu on minor 2
[  221.940817] panfrost 13040000.gpu: error powering up gpu stack
[  222.018233] panfrost 13040000.gpu: error powering up gpu stack
(repeated)

So the GPU is probed, but there's an issue when powering up the STACK, not
quite sure why, I'll try to have a deeper look, at some point.

Thanks!

Nicolas

v2:
 - Use sram instead of mali_sram as SRAM supply name.
 - Rename mali@ to gpu@.
 - Add dt-bindings changes
 - Stacking patches after the device tree change that allow basic
   probing (still incomplete and broken).

Nicolas Boichat (7):
  dt-bindings: gpu: mali-bifrost: Add Mediatek MT8183
  arm64: dts: mt8183: Add node for the Mali GPU
  drm/panfrost: Improve error reporting in panfrost_gpu_power_on
  drm/panfrost: Add support for a second regulator for the GPU
  drm/panfrost: Add support for multiple power domain support
  RFC: drm/panfrost: Add bifrost compatible string
  RFC: drm/panfrost: devfreq: Add support for 2 regulators

 .../bindings/gpu/arm,mali-bifrost.yaml        |  20 ++++
 arch/arm64/boot/dts/mediatek/mt8183-evb.dts   |   7 ++
 arch/arm64/boot/dts/mediatek/mt8183.dtsi      | 104 +++++++++++++++++
 drivers/gpu/drm/panfrost/panfrost_devfreq.c   |  18 +++
 drivers/gpu/drm/panfrost/panfrost_device.c    | 108 ++++++++++++++++--
 drivers/gpu/drm/panfrost/panfrost_device.h    |   7 ++
 drivers/gpu/drm/panfrost/panfrost_drv.c       |   1 +
 drivers/gpu/drm/panfrost/panfrost_gpu.c       |  15 ++-
 8 files changed, 267 insertions(+), 13 deletions(-)

-- 
2.24.1.735.g03f4e72817-goog

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