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Subject[PATCH 00/15][RFC] Add regulator devfreq support to Panfrost

This serie cleans and adds regulator support to Panfrost devfreq.
This is mostly based on comment for the freshly introduced lima

We need to add regulator support because on Allwinner the GPU OPP
table defines both frequencies and voltages.

First patches [01-08] should not change the actual behavior
and introduce a proper panfrost_devfreq struct.

Fatches after are WIP and add regulator support.

However I got several issues first we need to avoid getting regulator
if devfreq get by itself the regulator, but as of today the OPP
framework only get and don't enable the regulator...
An HACK for now is to add regulator-always-on in the device-tree.

Then when I enable devfreq I got several faults like.
I'm totally noob on GPU sched/fault and couldn't be helpfull with this.

I got this running glmark2 on T720 (Allwinner H6) with Mesa 20.0.5.
# glmark2-es2-drm
glmark2 2017.07
OpenGL Information
GL_VENDOR: Panfrost
GL_RENDERER: Mali T720 (Panfrost)
GL_VERSION: OpenGL ES 2.0 Mesa 20.0.5

[ 93.550063] panfrost 1800000.gpu: GPU Fault 0x00000088 (UNKNOWN) at 0x0000000080117100
[ 94.045401] panfrost 1800000.gpu: gpu sched timeout, js=0, config=0x3700, status=0x8, head=0x21d6c00, tail=0x21d6c00, sched_job=00000000e3c2132f

[ 328.871070] panfrost 1800000.gpu: Unhandled Page fault in AS0 at VA 0x0000000000000000
[ 328.871070] Reason: TODO
[ 328.871070] raw fault status: 0xAA0003C2
[ 328.871070] decoded fault status: SLAVE FAULT
[ 328.871070] exception type 0xC2: TRANSLATION_FAULT_LEVEL2
[ 328.871070] access type 0x3: WRITE
[ 328.871070] source id 0xAA00
[ 329.373327] panfrost 1800000.gpu: gpu sched timeout, js=1, config=0x3700, status=0x8, head=0xa1a4900, tail=0xa1a4900, sched_job=000000007ac31097
[ 329.386527] panfrost 1800000.gpu: js fault, js=0, status=DATA_INVALID_FAULT, head=0xa1a4c00, tail=0xa1a4c00
[ 329.396293] panfrost 1800000.gpu: gpu sched timeout, js=0, config=0x3700, status=0x58, head=0xa1a4c00, tail=0xa1a4c00, sched_job=0000000004c90381
[ 329.411521] panfrost 1800000.gpu: Unhandled Page fault in AS0 at VA 0x0000000000000000
[ 329.411521] Reason: TODO
[ 329.411521] raw fault status: 0xAA0003C2
[ 329.411521] decoded fault status: SLAVE FAULT
[ 329.411521] exception type 0xC2: TRANSLATION_FAULT_LEVEL2
[ 329.411521] access type 0x3: WRITE
[ 329.411521] source id 0xAA00

Thanks for your reviews, help on this serie,

Clément Péron (15):
drm/panfrost: avoid static declaration
drm/panfrost: clean headers in devfreq
drm/panfrost: don't use pfdevfreq.busy_count to know if hw is idle
drm/panfrost: introduce panfrost_devfreq struct
drm/panfrost: use spinlock instead of atomic
drm/panfrost: properly handle error in probe
drm/panfrost: use device_property_present to check for OPP
drm/panfrost: move devfreq_init()/fini() in device
drm/panfrost: dynamically alloc regulators
drm/panfrost: add regulators to devfreq
drm/panfrost: set devfreq clock name
arm64: defconfig: Enable devfreq cooling device
arm64: dts: allwinner: h6: Add cooling map for GPU
[DO NOT MERGE] arm64: dts: allwinner: h6: Add GPU OPP table
[DO NOT MERGE] arm64: dts: allwinner: force GPU regulator to be always

.../dts/allwinner/sun50i-h6-beelink-gs1.dts | 1 +
arch/arm64/boot/dts/allwinner/sun50i-h6.dtsi | 102 ++++++++++
arch/arm64/configs/defconfig | 1 +
drivers/gpu/drm/panfrost/panfrost_devfreq.c | 190 ++++++++++++------
drivers/gpu/drm/panfrost/panfrost_devfreq.h | 32 ++-
drivers/gpu/drm/panfrost/panfrost_device.c | 56 ++++--
drivers/gpu/drm/panfrost/panfrost_device.h | 14 +-
drivers/gpu/drm/panfrost/panfrost_drv.c | 15 +-
drivers/gpu/drm/panfrost/panfrost_job.c | 10 +-
9 files changed, 310 insertions(+), 111 deletions(-)


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