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drm/i915: Read out VGA dotclock properly on LPT

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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>
This commit is contained in:
Ville Syrjälä
2016-02-17 21:41:12 +02:00
parent 64b46a0631
commit 8802e5b6de
4 changed files with 48 additions and 2 deletions
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1
drivers/gpu/drm/i915/intel_drv.h
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@@ -1181,6 +1181,7 @@ struct intel_shared_dpll *intel_get_shared_dpll(struct intel_crtc *crtc,
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,