[Bug 205277] New: [amd powerplay] vega10: soc voltage for power state 7 is not changed by overdrive.

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=205277

            Bug ID: 205277
           Summary: [amd powerplay] vega10: soc voltage for power state 7
                    is not changed by overdrive.
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.4.0-rc3
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: pelle at vangils.xyz
        Regression: No

Created attachment 285583
  --> https://bugzilla.kernel.org/attachment.cgi?id=285583&action=edit
debug patch

Using Overdrive to set voltage and frequency on a vega10 card does not set the
voltage for the highest power state (state 7).

To reproduce:

boot with kernel parameter 'amdgpu.ppfeaturemask=0xffffffff'


cat pp_od_clk_voltage on boot:

OD_SCLK:
0:        852Mhz        800mV
1:        991Mhz        900mV
2:       1138Mhz        950mV
3:       1269Mhz       1000mV
4:       1312Mhz       1050mV
5:       1474Mhz       1100mV
6:       1538Mhz       1150mV
7:       1590Mhz       1200mV
OD_MCLK:
0:        167Mhz        800mV
1:        500Mhz        800mV
2:        700Mhz        900mV
3:        800Mhz        950mV
OD_RANGE:
SCLK:     852MHz       2400MHz
MCLK:     167MHz       1500MHz
VDDC:     800mV        1200mV


set pp_od_clk_voltage:

# cd /sys/class/drm/card0/device

# echo "s 2 1138 910" > pp_od_clk_voltage
# echo "s 3 1269 920" > pp_od_clk_voltage
# echo "s 4 1312 930" > pp_od_clk_voltage
# echo "s 5 1474 940" > pp_od_clk_voltage
# echo "s 6 1538 950" > pp_od_clk_voltage
# echo "s 7 1590 980" > pp_od_clk_voltage

# echo "c" > pp_od_clk_voltage


cat pp_od_clk_voltage:

OD_SCLK:
0:        852Mhz        800mV
1:        991Mhz        900mV
2:       1138Mhz        910mV
3:       1269Mhz        920mV
4:       1269Mhz        920mV
5:       1474Mhz        940mV
6:       1538Mhz        950mV
7:       1590Mhz        980mV
OD_MCLK:
0:        167Mhz        800mV
1:        500Mhz        800mV
2:        700Mhz        900mV
3:        800Mhz        950mV
OD_RANGE:
SCLK:     852MHz       2400MHz
MCLK:     167MHz       1500MHz
VDDC:     800mV        1200mV


This all seems fine. The voltages are set for all the power states.
But when stressing the gpu it still uses it's default of 1200mV for power state
7, as can be observed in amdgpu_pm_info:

# cat /sys/kernel/debug/dri/0/amdgpu_pm_info
...
GFX Clocks and Power:
        800 MHz (MCLK)
        1484 MHz (SCLK)
        1269 MHz (PSTATE_SCLK)
        700 MHz (PSTATE_MCLK)
        1200 mV (VDDGFX)
        260.0 W (average GPU)
...


Using the attached patch to print the voltages that are actually being set to
the vddc_lookup_table the output to dmesg is:

...
[  521.364502] amdgpu: [powerplay] vega10 SCLK vddc_lookup_table state: 0 vddc:
800
[  521.364504] amdgpu: [powerplay] vega10 SCLK vddc_lookup_table state: 1 vddc:
900
[  521.364504] amdgpu: [powerplay] vega10 SCLK vddc_lookup_table state: 2 vddc:
910
[  521.364505] amdgpu: [powerplay] vega10 SCLK vddc_lookup_table state: 3 vddc:
920
[  521.364505] amdgpu: [powerplay] vega10 SCLK vddc_lookup_table state: 4 vddc:
920
[  521.364506] amdgpu: [powerplay] vega10 SCLK vddc_lookup_table state: 5 vddc:
940
[  521.364506] amdgpu: [powerplay] vega10 SCLK vddc_lookup_table state: 6 vddc:
950
...


_Not_ printing state 7. So it appears the vddc value for state 7 is never set
in the new lookup table.

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