Disable RPS by setting RP_CONTROL to 0, remembering its earlier value.
Then adjust the thresholds before re-enabling RP_CONTROL.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuopp...@linux.intel.com>
Cc: sta...@vger.kernel.org
---
drivers/gpu/drm/i915/intel_pm.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index d37e95b3525d..e5cfa0377367 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4804,6 +4804,7 @@ static void gen6_set_rps_thresholds(struct
drm_i915_private *dev_priv, u8 val)
int new_power;
u32 threshold_up = 0, threshold_down = 0; /* in % */
u32 ei_up = 0, ei_down = 0;
+ u32 rp_control;
new_power = dev_priv->rps.power;
switch (dev_priv->rps.power) {
@@ -4872,6 +4873,12 @@ static void gen6_set_rps_thresholds(struct
drm_i915_private *dev_priv, u8 val)
spin_lock_irq(&dev_priv->uncore.lock);
intel_uncore_forcewake_get__locked(dev_priv, FORCEWAKE_ALL);
+ /* Stop RPS before changing thresholds */
+ rp_control = I915_READ_FW(GEN6_RP_CONTROL);
+ I915_WRITE_FW(GEN6_RP_CONTROL, 0);
+ POSTING_READ_FW(GEN6_RP_CONTROL);
+
+ /* Update thresholds and evaluation intervals */
I915_WRITE_FW(GEN6_RP_UP_EI,
GT_INTERVAL_FROM_US(dev_priv, ei_up));
I915_WRITE_FW(GEN6_RP_UP_THRESHOLD,
@@ -4885,8 +4892,7 @@ static void gen6_set_rps_thresholds(struct
drm_i915_private *dev_priv, u8 val)
ei_down * threshold_down / 100));
/* Restart RPS to reload the thresholds */
- I915_WRITE_FW(GEN6_RP_CONTROL,
- I915_READ_FW(GEN6_RP_CONTROL) | GEN6_RP_ENABLE);
+ I915_WRITE_FW(GEN6_RP_CONTROL, rp_control | GEN6_RP_ENABLE);
intel_uncore_forcewake_put__locked(dev_priv, FORCEWAKE_ALL);
spin_unlock_irq(&dev_priv->uncore.lock);
--
2.11.0
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