[Intel-gfx] [PATCH v2] drm/i915: Restore rps/rc6 on reset

[Daniel Vetter]

On Tue, Feb 04, 2014 at 11:32:31AM -0600, jeff.mcgee at intel.com wrote:
> From: Jeff McGee <jeff.mcgee at intel.com>
> 
> A check of rps/rc6 state after i915_reset determined that the ring
> MAX_IDLE registers were returned to their hardware defaults and that
> the GEN6_PMIMR register was set to mask all interrupts. This change
> restores those values to their pre-reset states by re-initializing
> rps/rc6 in i915_reset. A full re-initialization was opted for versus
> a targeted set of restore operations for simplicity and maintain-
> ability. Note that the re-initialization is not done for Ironlake,
> due to a past comment that it causes problems.
> 
> Also updated the rps initialization sequence to preserve existing
> min/max values in the case of a re-init. We assume the values were
> validated upon being set and do not do further range checking. The
> debugfs interface for changing min/max was updated with range
> checking to ensure this condition (already present in sysfs
> interface).
> 
> v2: fix rps logging to output hw_max and hw_min, not rps.max_delay
>     and rps.min_delay which don't strictly represent hardware limits.
>     Add igt testcase to signed-off-by section.
> 
> Testcase: igt/pm_rps/reset
> Signed-off-by: Jeff McGee <jeff.mcgee at intel.com>

Queued for -next, thanks for the patch.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch