From: Akash Goel <akash.goel@xxxxxxxxx>
On SKL the frequency is specified in units of 16.66 MHZ, barring the
RP_STATE_CAP(0x5998) register, which still reports frequency in units
of 50 MHZ. So an extra conversion is required in gen6_init_rps_frequencies
function for SKL, to store the frequency values as per the actual hardware unit.
Signed-off-by: Akash Goel <akash.goel@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 1b36d0e..9dcfca6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4032,6 +4032,13 @@ static void gen6_init_rps_frequencies(struct drm_device *dev)
dev_priv->rps.rp0_freq = (rp_state_cap >> 0) & 0xff;
dev_priv->rps.rp1_freq = (rp_state_cap >> 8) & 0xff;
dev_priv->rps.min_freq = (rp_state_cap >> 16) & 0xff;
+ if (IS_SKYLAKE(dev)) {
+ /* Store the frequency values in 16.66 MHZ units, which is
+ the natural hardware unit for SKL */
+ dev_priv->rps.rp0_freq /= GEN9_FREQ_SCALER;
+ dev_priv->rps.rp1_freq /= GEN9_FREQ_SCALER;
+ dev_priv->rps.min_freq /= GEN9_FREQ_SCALER;
+ }
/* hw_max = RP0 until we check for overclocking */
dev_priv->rps.max_freq = dev_priv->rps.rp0_freq;
--
1.9.2
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