drm/i915: Read out VGA dotclock properly on LPT
Rather than assume the VGA dotclock is really the FDI based thing,
let's read out the real thing via iclkip, and after readout it'll
get to compare it with the FDI based number to make sure they're
in sync.
Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1455738073-14502-6-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Imre Deak <imre.deak@intel.com>
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 859dfc5..cb413e2 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -1181,6 +1181,7 @@
int vlv_force_pll_on(struct drm_device *dev, enum pipe pipe,
const struct dpll *dpll);
void vlv_force_pll_off(struct drm_device *dev, enum pipe pipe);
+int lpt_get_iclkip(struct drm_i915_private *dev_priv);
/* modesetting asserts */
void assert_panel_unlocked(struct drm_i915_private *dev_priv,