On Tue, 2014-10-07 at 17:41 +0300, ville.syrj...@linux.intel.com wrote: > From: Ville Syrjälä <ville.syrj...@linux.intel.com> > > We need the HPLL frequency when calculating cdclk. Currently we read > that out from the hardware every single time, which isn't going to fly > very well if the device is runtime suspended. So cache the HPLL > frequency in dev_priv and use the cached value. > > Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
You could add: Reference: https://bugs.freedesktop.org/show_bug.cgi?id=82939 where this fixes some subtest failures on VLV. On 1/3 and 3/3 of this patchset: Reviewed-by: Imre Deak <imre.d...@intel.com> > --- > drivers/gpu/drm/i915/i915_drv.h | 1 + > drivers/gpu/drm/i915/intel_display.c | 14 +++++++------- > 2 files changed, 8 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h > index 1e476b5..68a3509 100644 > --- a/drivers/gpu/drm/i915/i915_drv.h > +++ b/drivers/gpu/drm/i915/i915_drv.h > @@ -1545,6 +1545,7 @@ struct drm_i915_private { > > unsigned int fsb_freq, mem_freq, is_ddr3; > unsigned int vlv_cdclk_freq; > + unsigned int hpll_freq; > > /** > * wq - Driver workqueue for GEM. > diff --git a/drivers/gpu/drm/i915/intel_display.c > b/drivers/gpu/drm/i915/intel_display.c > index 149310b..6fbae00 100644 > --- a/drivers/gpu/drm/i915/intel_display.c > +++ b/drivers/gpu/drm/i915/intel_display.c > @@ -4660,10 +4660,9 @@ static void valleyview_set_cdclk(struct drm_device > *dev, int cdclk) > mutex_unlock(&dev_priv->rps.hw_lock); > > if (cdclk == 400000) { > - u32 divider, vco; > + u32 divider; > > - vco = valleyview_get_vco(dev_priv); > - divider = DIV_ROUND_CLOSEST(vco << 1, cdclk) - 1; > + divider = DIV_ROUND_CLOSEST(dev_priv->hpll_freq << 1, cdclk) - > 1; > > mutex_lock(&dev_priv->dpio_lock); > /* adjust cdclk divider */ > @@ -4742,8 +4741,7 @@ static void cherryview_set_cdclk(struct drm_device > *dev, int cdclk) > static int valleyview_calc_cdclk(struct drm_i915_private *dev_priv, > int max_pixclk) > { > - int vco = valleyview_get_vco(dev_priv); > - int freq_320 = (vco << 1) % 320000 != 0 ? 333333 : 320000; > + int freq_320 = (dev_priv->hpll_freq << 1) % 320000 != 0 ? 333333 : > 320000; > > /* FIXME: Punit isn't quite ready yet */ > if (IS_CHERRYVIEW(dev_priv->dev)) > @@ -5452,7 +5450,6 @@ static int intel_crtc_compute_config(struct intel_crtc > *crtc, > static int valleyview_get_display_clock_speed(struct drm_device *dev) > { > struct drm_i915_private *dev_priv = dev->dev_private; > - int vco = valleyview_get_vco(dev_priv); > u32 val; > int divider; > > @@ -5460,6 +5457,9 @@ static int valleyview_get_display_clock_speed(struct > drm_device *dev) > if (IS_CHERRYVIEW(dev)) > return 400000; > > + if (dev_priv->hpll_freq == 0) > + dev_priv->hpll_freq = valleyview_get_vco(dev_priv); > + > mutex_lock(&dev_priv->dpio_lock); > val = vlv_cck_read(dev_priv, CCK_DISPLAY_CLOCK_CONTROL); > mutex_unlock(&dev_priv->dpio_lock); > @@ -5470,7 +5470,7 @@ static int valleyview_get_display_clock_speed(struct > drm_device *dev) > (divider << DISPLAY_FREQUENCY_STATUS_SHIFT), > "cdclk change in progress\n"); > > - return DIV_ROUND_CLOSEST(vco << 1, divider + 1); > + return DIV_ROUND_CLOSEST(dev_priv->hpll_freq << 1, divider + 1); > } > > static int i945_get_display_clock_speed(struct drm_device *dev) _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
