drm/i915: fix DDI PLLs HW state readout code

Properly zero the refcounts and crtc->ddi_pll_set so the previous HW
state doesn't affect the result of reading the current HW state.

This fixes WARNs about WRPLL refcount if we have an HDMI monitor on
HSW and then suspend/resume.

Cc: stable@vger.kernel.org
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=64379
Tested-by: Qingshuai Tian <qingshuai.tian@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 526c8ded16b03bc334846609a47e2d0bfc07c58c..b69dc3e66c165ac77782943450d98602ef75c205 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -1057,12 +1057,18 @@ void intel_ddi_setup_hw_pll_state(struct drm_device *dev)
        enum pipe pipe;
        struct intel_crtc *intel_crtc;
 
+       dev_priv->ddi_plls.spll_refcount = 0;
+       dev_priv->ddi_plls.wrpll1_refcount = 0;
+       dev_priv->ddi_plls.wrpll2_refcount = 0;
+
        for_each_pipe(pipe) {
                intel_crtc =
                        to_intel_crtc(dev_priv->pipe_to_crtc_mapping[pipe]);
 
-               if (!intel_crtc->active)
+               if (!intel_crtc->active) {
+                       intel_crtc->ddi_pll_sel = PORT_CLK_SEL_NONE;
                        continue;
+               }
 
                intel_crtc->ddi_pll_sel = intel_ddi_get_crtc_pll(dev_priv,
                                                                 pipe);