[Bug 89792] [BSW/SKL Debugfs] cat /sys/kernel/debug/dri/0/i915_sr_status showing self-refresh: disabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89792

--- Comment #21 from Imre Deak <imre.deak at intel.com> ---
(In reply to Elizabeth from comment #19)
> Not sure of the validity of this tests, but if I do the "cat" I always get
> "disable".
> 
> [gfx at BSW-1-BRASWELL] [~]$ : uname -r
> 4.16.0-rc7-drm-intel-qa-ww14-commit-f818c2b+
> [gfx at BSW-1-BRASWELL] [~]$ : sudo cat /sys/kernel/debug/dri/0/i915_sr_status
> self-refresh: disabled

This should show enabled if you have any output enabled on pipe A or B. Can you
make sure this is the case before reading i915_sr_status?

> 
> [gfx at SKL-3-NUC6i7KYB] [~]$ : sudo cat /sys/kernel/debug/dri/0/i915_sr_status
> self-refresh: disabled
> [gfx at SKL-3-NUC6i7KYB] [~]$ : uname -r
> 4.16.0-rc7-drm-intel-qa-ww14-commit-f818c2b+

This is expected, on GEN9+ there is no global memory self-refresh state, so
i915_sr_status will always return disabled on these platforms.

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