On Mon, 2017-06-05 at 19:55 +0300, Ville Syrjälä wrote:
> On Mon, Jun 05, 2017 at 04:41:07PM +0000, Vivi, Rodrigo wrote:
> > On Mon, 2017-06-05 at 18:22 +0300, Imre Deak wrote:
> > > On Thu, Apr 06, 2017 at 12:15:27PM -0700, Rodrigo Vivi wrote:
> > > > All the low level cdclk bits are present, so let's add the required
> > > > hooks to reconfigure cdclk on the fly.
> > > >
> > > > v2: Rebase due to cnl_sanitize_cdclk()
> > > > v3: Rebased by Rodrigo on top of Ville's cdclk rework.
> > > > v4: Rebase moving cnl_calc_cdclk up to follow same order
> > > > as previous platforms.
> > > >
> > > > Signed-off-by: Ville Syrjälä <[email protected]>
> > > > Signed-off-by: Rodrigo Vivi <[email protected]>
> > > > ---
> > > > drivers/gpu/drm/i915/intel_cdclk.c | 54
> > > > ++++++++++++++++++++++++++++++++++++--
> > > > 1 file changed, 52 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/drivers/gpu/drm/i915/intel_cdclk.c
> > > > b/drivers/gpu/drm/i915/intel_cdclk.c
> > > > index f9ba1e7..a8c254b 100644
> > > > --- a/drivers/gpu/drm/i915/intel_cdclk.c
> > > > +++ b/drivers/gpu/drm/i915/intel_cdclk.c
> > > > @@ -1400,6 +1400,16 @@ void bxt_uninit_cdclk(struct drm_i915_private
> > > > *dev_priv)
> > > > bxt_set_cdclk(dev_priv, &cdclk_state);
> > > > }
> > > >
> > > > +static int cnl_calc_cdclk(int max_pixclk)
> > > > +{
> > > > + if (max_pixclk > 336000)
> > > > + return 528000;
> > > > + else if (max_pixclk > 168000)
> > > > + return 336000;
> > > > + else
> > > > + return 168000;
> > > > +}
> > > > +
> > > > static void cnl_cdclk_pll_update(struct drm_i915_private *dev_priv,
> > > > struct intel_cdclk_state *cdclk_state)
> > > > {
> > > > @@ -1640,7 +1650,7 @@ void cnl_init_cdclk(struct drm_i915_private
> > > > *dev_priv)
> > > >
> > > > cdclk_state = dev_priv->cdclk.hw;
> > > >
> > > > - cdclk_state.cdclk = 168000;
> > > > + cdclk_state.cdclk = cnl_calc_cdclk(0);
> > > > cdclk_state.vco = cnl_cdclk_pll_vco(dev_priv,
> > > > cdclk_state.cdclk);
> > > >
> > > > cnl_set_cdclk(dev_priv, &cdclk_state);
> > > > @@ -1928,6 +1938,40 @@ static int bxt_modeset_calc_cdclk(struct
> > > > drm_atomic_state *state)
> > > > return 0;
> > > > }
> > > >
> > > > +static int cnl_modeset_calc_cdclk(struct drm_atomic_state *state)
> > > > +{
> > > > + struct drm_i915_private *dev_priv = to_i915(state->dev);
> > > > + struct intel_atomic_state *intel_state =
> > > > + to_intel_atomic_state(state);
> > > > + int max_pixclk = intel_max_pixel_rate(state);
> > > > + int cdclk, vco;
> > > > +
> > > > + cdclk = cnl_calc_cdclk(max_pixclk);
> > > > + vco = cnl_cdclk_pll_vco(dev_priv, cdclk);
> > >
> > > The spec says not to set CDCLK to 168MHz if audio is used with 96MHz
> > > BCLK, what's the plan to add that constraint? At least there could be a
> > > TODO: here.
> >
> > That's a good question.
> > Do we have ways to know the audio freq?
> > Or we need to add few extra hooks?
> > And agree, at least a TODO or FIXME here is needed while we dont have a
> > clear path.
>
> bdw_adjust_min_pipe_pixel_rate() just assumes 96MHz. There was some
> discussion on the topic, and I found some register that possibly could
> tell us something. But the best solution would probably involve querying
> it from the audio driver.
>
The last time I checked with the audio folks, the driver does not change
the BCLK freq. and the default is 96 MHz.
> >
> > >
> > > > +
> > > > + if (cdclk > dev_priv->max_cdclk_freq) {
> > > > + DRM_DEBUG_KMS("requested cdclk (%d kHz) exceeds max (%d
> > > > kHz)\n",
> > > > + cdclk, dev_priv->max_cdclk_freq);
> > > > + return -EINVAL;
> > > > + }
> > > > +
> > > > + intel_state->cdclk.logical.vco = vco;
> > > > + intel_state->cdclk.logical.cdclk = cdclk;
> > > > +
> > > > + if (!intel_state->active_crtcs) {
> > > > + cdclk = cnl_calc_cdclk(0);
> > > > + vco = cnl_cdclk_pll_vco(dev_priv, cdclk);
> > > > +
> > > > + intel_state->cdclk.actual.vco = vco;
> > > > + intel_state->cdclk.actual.cdclk = cdclk;
> > > > + } else {
> > > > + intel_state->cdclk.actual =
> > > > + intel_state->cdclk.logical;
> > > > + }
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > static int intel_compute_max_dotclk(struct drm_i915_private *dev_priv)
> > > > {
> > > > int max_cdclk_freq = dev_priv->max_cdclk_freq;
> > > > @@ -1959,7 +2003,9 @@ static int intel_compute_max_dotclk(struct
> > > > drm_i915_private *dev_priv)
> > > > */
> > > > void intel_update_max_cdclk(struct drm_i915_private *dev_priv)
> > > > {
> > > > - if (IS_GEN9_BC(dev_priv)) {
> > > > + if (IS_CANNONLAKE(dev_priv)) {
> > > > + dev_priv->max_cdclk_freq = 528000;
> > > > + } else if (IS_GEN9_BC(dev_priv)) {
> > > > u32 limit = I915_READ(SKL_DFSM) &
> > > > SKL_DFSM_CDCLK_LIMIT_MASK;
> > > > int max_cdclk, vco;
> > > >
> > > > @@ -2158,6 +2204,10 @@ void intel_init_cdclk_hooks(struct
> > > > drm_i915_private *dev_priv)
> > > > dev_priv->display.set_cdclk = skl_set_cdclk;
> > > > dev_priv->display.modeset_calc_cdclk =
> > > > skl_modeset_calc_cdclk;
> > > > + } else if (IS_CANNONLAKE(dev_priv)) {
> > > > + dev_priv->display.set_cdclk = cnl_set_cdclk;
> > > > + dev_priv->display.modeset_calc_cdclk =
> > > > + cnl_modeset_calc_cdclk;
> > > > }
> > > >
> > > > if (IS_CANNONLAKE(dev_priv))
> > > > --
> > > > 1.9.1
> > > >
> > > > _______________________________________________
> > > > Intel-gfx mailing list
> > > > [email protected]
> > > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> >
>
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