From: Ville Syrjälä Date: Fri, 7 Nov 2014 19:33:45 +0000 (+0200) Subject: drm/i915: Warn if GPLL isn't used on vlv/chv X-Git-Tag: v3.19-rc1~73^2~14^2~56 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=8d40c3ae51483059733187ba8bc6e031764fafec;p=karo-tx-linux.git drm/i915: Warn if GPLL isn't used on vlv/chv 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 Reviewed-by: Deepak S Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c index 1f2441ffa6e4..cbf84cc84e55 100644 --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -5333,6 +5333,9 @@ 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); @@ -5413,6 +5416,9 @@ 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);