[G96] Reclocking fails on voltage

Submitted by Pekka Paalanen @pq

Assigned to Nouveau Project

Link to original bug (#99913)

Description

Attempting to set the performance level to 15 on my laptop results in errors.

nouveau 0000:01:00.0: NVIDIA G96 (096500a1)
nouveau 0000:01:00.0: bios: version 62.94.3c.00.15
nouveau 0000:01:00.0: fb: 512 MiB GDDR3

The kernel module has options: config=NvClkMode=15
That leads to errors:

nouveau 0000:01:00.0: clk: failed to raise voltage: -22
...
nouveau 0000:01:00.0: clk: error setting pstate 3: -22

After that the contents of /sys/kernel/debug/dri/0/pstate are:

03: core 169 MHz shader 338 MHz memory 100 MHz
05: core 275 MHz shader 550 MHz memory 300 MHz
07: core 400 MHz shader 800 MHz memory 300 MHz
0f: core 625 MHz shader 1563 MHz memory 800 MHz AC DC *
AC: core 275 MHz shader 550 MHz memory 799 MHz

Kernel log and VBIOS will follow.