[Intel-gfx] i915/drm: SNB gpu won't throttle up with latest forcewake/gpufreq tracepoint drm patches

[Nicolas Kalkhof]

Hello,

the patchset from ~danvet/drm-intel git  from earlier september concerning forcewake and gpu frequency made my SNB much calmer during idle times. However the GPU won't hit the turbo throttle when the load goes up resulting in very low framerates during gameplay. Most times the frequency read from /sys/class/drm/card0/gt_cur_freq_mhz is stuck to the lowest frequency.

Sysfs yields the following during load spikes:

i915_gen6_forcewake_count: 1

i915_cur_delayinfo:
GT_PERF_STATUS: 0x00000d8a
RPSTAT1: 0x00040d00
Render p-state ratio: 13
Render p-state VID: 138
Render p-state limit: 255
CAGF: 650MHz
RP CUR UP EI: 18814us
RP CUR UP: 10217us
RP PREV UP: 43514us
RP CUR DOWN EI: 0us
RP CUR DOWN: 0us
RP PREV DOWN: 0us
Lowest (RPN) frequency: 650MHz
Nominal (RP1) frequency: 650MHz
Max non-overclocked (RP0) frequency: 1300MHz

sensors:
acpitz-virtual-0
Adapter: Virtual device
temp1:        +62.0 C  (crit = +98.0 C)
coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +63.0 C  (high = +86.0 C, crit = +100.0 C)
Core 0:         +63.0 C  (high = +86.0 C, crit = +100.0 C)
Core 1:         +63.0 C  (high = +86.0 C, crit = +100.0 C)

/sys/class/drm/card0/gt_cur_freq_mhz: 650
/sys/class/drm/card0/gt_max_freq_mhz: 1300
/sys/class/drm/card0/gt_min_freq_mhz: 650

Kernel Params: i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1

Setting /sys/class/drm/card0/gt_min_freq_mhz to 1300MHz manually fixes the throttling issue however the gpu obviously won't throttle back then.

Any ideas/clues?

Best regards,

Nic

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