Messages in this thread | | | Subject | Re: [PATCH 00/15][RFC] Add regulator devfreq support to Panfrost | From | Tomeu Vizoso <> | Date | Mon, 11 May 2020 07:43:47 +0200 |
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On 5/10/20 6:55 PM, Clément Péron wrote: > Hi, > > This serie cleans and adds regulator support to Panfrost devfreq. > This is mostly based on comment for the freshly introduced lima > devfreq. > > 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.
Do you know at which frequencies do the faults happen? From what I can see, it's just the GPU behaving erratically, and the CPU reading random values from the GPU registers. Given the subject of this series, I guess the GPU isn't getting enough power.
There could be a problem with the OPP table, might be a good idea to see what levels are problematic and try with a more conservative table.
Besides that, there could be a problem with clock frequency changes, or voltage changes. It may take some time for the final state to be stable, depending how the regulation happens.
Thanks,
Tomeu
> 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, > Clement > > 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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