W dniu 13.05.2020 o 11:21, Marcin Juszkiewicz pisze:
> Some time ago I bought Rockpro64 board from Pine64. To check how EBBR
> works, how PCIe works on SBCs, Mali Panfrost driver etc.
> 
> Board arrived yesterday. I connected serial cable (CB2102 dongles suxx,
> FT2232HL works fine at 1.5Mbps serial), Ethernet, HDMI and booted.
> 
> Boot fails each time at same place (whole boot log attached):
> 
> [   29.043106] panfrost ff9a0000.gpu: clock rate = 500000000
> [   29.053073] rockchip-vop ff8f0000.vop: Adding to iommu group 1
> [   29.058099] panfrost ff9a0000.gpu: mali-t860 id 0x860 major 0x2 minor
> 0x0 status 0x0
> [   29.058948] panfrost ff9a0000.gpu: features: 00000000,100e77bf,
> issues: 00000000,24040400
> [   29.059820] panfrost ff9a0000.gpu: Features: L2:0x07120206
> Shader:0x00000000 Tiler:0x00000809 Mem:0x1 MMU:0x00002830 AS:0xff JS:0x7
> [   29.061053] panfrost ff9a0000.gpu: shader_present=0xf l2_present=0x1
> [   29.063559] rockchip-vop ff900000.vop: Adding to iommu group 2
> [   29.147966] panfrost ff9a0000.gpu: devfreq_add_device: Unable to find
> governor for the device
> [   29.151244] panfrost ff9a0000.gpu: [drm:panfrost_devfreq_init
> [panfrost]] *ERROR* Couldn't initialize GPU devfreq
> [   29.173499] panfrost ff9a0000.gpu: Fatal error during devfreq init
> 
> Same effect with F32 and it's 5.6.6 kernel and with rawhide and 5.7-rc4 one.
> 
> Board boots to login when I blacklist "panfrost" driver with
> "rd.driver.blacklist=panfrost" kernel argument.
> 
> Any suggestions what to look at? It's been a while since I did kernel
> debugging.

Turns out that DEVFREQ_GOV_SIMPLE_ONDEMAND module needs to be loaded
before Panfrost.
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