From: Ville Syrjälä <ville.syrj...@linux.intel.com>
CHV wants even rps opcodes so print a warning of the
min/max/rpe/rp1 values are odd, and warn if an odd value
slips through to valleyview_set_rps() and truncate it to
an even value.
Also add a comment to chv_freq_opcode() to make sure no one
changes the code without considering this requirement.
Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
drivers/gpu/drm/i915/intel_pm.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c8f744c..c84ad93 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3453,6 +3453,10 @@ void valleyview_set_rps(struct drm_device *dev, u8 val)
dev_priv->rps.cur_freq,
vlv_gpu_freq(dev_priv, val), val);
+ if (WARN_ONCE(IS_CHERRYVIEW(dev) && (val & 1),
+ "Odd GPU freq value\n"))
+ val &= ~1;
+
if (val != dev_priv->rps.cur_freq)
vlv_punit_write(dev_priv, PUNIT_REG_GPU_FREQ_REQ, val);
@@ -4149,6 +4153,12 @@ static void cherryview_init_gt_powersave(struct
drm_device *dev)
vlv_gpu_freq(dev_priv, dev_priv->rps.min_freq),
dev_priv->rps.min_freq);
+ WARN_ONCE((dev_priv->rps.max_freq |
+ dev_priv->rps.efficient_freq |
+ dev_priv->rps.rp1_freq |
+ dev_priv->rps.min_freq) & 1,
+ "Odd GPU freq values\n");
+
/* Preserve min/max settings in case of re-init */
if (dev_priv->rps.max_freq_softlimit == 0)
dev_priv->rps.max_freq_softlimit = dev_priv->rps.max_freq;
@@ -7443,6 +7453,7 @@ static int chv_freq_opcode(struct drm_i915_private
*dev_priv, int val)
return -1;
}
+ /* CHV needs even values */
opcode = (DIV_ROUND_CLOSEST((val * 2 * mul), dev_priv->rps.cz_freq) *
2);
return opcode;
--
1.8.5.5
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