On Saturday 08 November 2014 01:03 AM, ville.syrjala@xxxxxxxxxxxxxxx wrote:
From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Our freq<->opcode conversions assume that GPLL is always used.
Apparently that should be the case always, but let's scream if we
ever encounter something different.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 71eb377..e8a6f92 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -5397,6 +5397,9 @@ static void cherryview_enable_rps(struct drm_device *dev)
val = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
+ /* RPS code assumes GPLL is used */
+ WARN_ONCE((val & GPLLENABLE) == 0, "GPLL not enabled\n");
+
DRM_DEBUG_DRIVER("GPLL enabled? %s\n", val & GPLLENABLE ? "yes" : "no");
DRM_DEBUG_DRIVER("GPU status: 0x%08x\n", val);
@@ -5477,6 +5480,9 @@ static void valleyview_enable_rps(struct drm_device *dev)
val = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
+ /* RPS code assumes GPLL is used */
+ WARN_ONCE((val & GPLLENABLE) == 0, "GPLL not enabled\n");
+
DRM_DEBUG_DRIVER("GPLL enabled? %s\n", val & GPLLENABLE ? "yes" : "no");
DRM_DEBUG_DRIVER("GPU status: 0x%08x\n", val);
Yup better to give warning if our assumption is wrong:)
Reviewed-by: Deepak S <deepak.s@xxxxxxxxxxxxxxx>
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