[Intel-gfx] [PATCH] drm/i915: Add the ddi get cdclk code for BXT.

[Imre Deak]

On ma, 2015-06-15 at 11:59 +0300, Ville Syrjälä wrote:
> On Wed, Jun 10, 2015 at 01:18:28PM -0700, Bob Paauwe wrote:
> > The registers and process differ from other platforms.
> > 
> > Signed-off-by: Bob Paauwe <bob.j.paauwe at intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_display.c | 27 +++++++++++++++++++++++++++
> >  1 file changed, 27 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index c38c297..41464a5 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -6687,6 +6687,30 @@ static int skylake_get_display_clock_speed(struct drm_device *dev)
> >  	return 24000;
> >  }
> >  
> > +static int broxton_get_display_clock_speed(struct drm_device *dev)
> > +{
> > +	struct drm_i915_private *dev_priv = to_i915(dev);
> > +	uint32_t cdctl = I915_READ(CDCLK_CTL);
> > +	uint32_t pll_freq = I915_READ(BXT_DE_PLL_CTL) & BXT_DE_PLL_RATIO_MASK;
> > +
> 
> You should return 19.2MHz if the DE PLL isn't enabled.

Agreed with Ville, Bob could you resend the patch with this fixed?

> > +	switch (cdctl & BXT_CDCLK_CD2X_DIV_SEL_MASK) {
> > +	case BXT_CDCLK_CD2X_DIV_SEL_1:
> > +		if (pll_freq == BXT_DE_PLL_RATIO(60)) /* PLL freq = 1152MHz */
> > +			return 576000;
> > +		else /* PLL freq = 1248MHz */
> > +			return 624000;
> > +	case BXT_CDCLK_CD2X_DIV_SEL_1_5:
> > +		return 384000;
> > +	case BXT_CDCLK_CD2X_DIV_SEL_2:
> > +		return 288000;
> > +	case BXT_CDCLK_CD2X_DIV_SEL_4:
> > +		return 144000;
> > +	}
> > +
> > +	/* error case, assume higer PLL freq. */
> > +	return 624000;
> > +}
> > +
> >  static int broadwell_get_display_clock_speed(struct drm_device *dev)
> >  {
> >  	struct drm_i915_private *dev_priv = dev->dev_private;
> > @@ -14649,6 +14673,9 @@ static void intel_init_display(struct drm_device *dev)
> >  	if (IS_SKYLAKE(dev))
> >  		dev_priv->display.get_display_clock_speed =
> >  			skylake_get_display_clock_speed;
> > +	else if (IS_BROXTON(dev))
> > +		dev_priv->display.get_display_clock_speed =
> > +			broxton_get_display_clock_speed;
> >  	else if (IS_BROADWELL(dev))
> >  		dev_priv->display.get_display_clock_speed =
> >  			broadwell_get_display_clock_speed;
> > -- 
> > 2.1.0
> > 
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>