drm/i915: Drop stray clearing of rps->last_adj

We used to reset last_adj to 0 on crossing a power domain boundary, to
slow down our rate of change. However, commit 60548c554be2 ("drm/i915:
Interactive RPS mode") accidentally caused it to be reset on every
frequency update, nerfing the fast response granted by the slow start
algorithm.

Fixes: 60548c554be2 ("drm/i915: Interactive RPS mode")
Testcase: igt/pm_rps/mix-max-config-loaded
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180802100631.31305-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 2531eb75bdceef43b390cd8824890ccff63eb2be..f90a3c7f1c4058037528f610982d8f7babd14cf4 100644 (file)
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -6371,7 +6371,6 @@ static void gen6_set_rps_thresholds(struct drm_i915_private *dev_priv, u8 val)
                new_power = HIGH_POWER;
        rps_set_power(dev_priv, new_power);
        mutex_unlock(&rps->power.mutex);
-       rps->last_adj = 0;
 }
 
 void intel_rps_mark_interactive(struct drm_i915_private *i915, bool interactive)