[Intel-gfx] [PATCH 31/67] drm/i915/cnl: Allow dynamic cdclk changes on CNL
Rodrigo Vivi
rodrigo.vivi at gmail.com
Tue Jun 6 18:12:09 UTC 2017
On Tue, Jun 6, 2017 at 11:09 AM, Rodrigo Vivi <rodrigo.vivi at gmail.com> wrote:
> On Tue, Jun 6, 2017 at 10:39 AM, Pandiyan, Dhinakaran
> <dhinakaran.pandiyan at intel.com> wrote:
>> On Tue, 2017-06-06 at 08:24 -0700, Rodrigo Vivi wrote:
>>> On Mon, Jun 5, 2017 at 10:04 AM, Pandiyan, Dhinakaran
>>> <dhinakaran.pandiyan at intel.com> wrote:
>>> > 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 <ville.syrjala at linux.intel.com>
>>> >> > > > Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
>>> >> > > > ---
>>> >> > > > 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.
>>>
>>> So, what should we do for now? Block 168? Remove 168?
>>
>> As Ville wrote, bdw_adjust_min_pipe_pixel_rate() already does that. You
>> just have to modify intel_max_pixel_rate() to include CNL too.
>
oh, so just squash [PATCH 67/67] drm/i915/cnl: Adjust min pixelrate.
here?
>
>>
>> -DK
>>
>>>
>>> >
>>> >
>>> >> >
>>> >> > >
>>> >> > > > +
>>> >> > > > + 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
>>> >> > > > Intel-gfx at lists.freedesktop.org
>>> >> > > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>>> >> >
>>> >>
>>> >
>>> > _______________________________________________
>>> > Intel-gfx mailing list
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>>>
>>>
>>>
>>
>
>
>
> --
> Rodrigo Vivi
> Blog: http://blog.vivi.eng.br
--
Rodrigo Vivi
Blog: http://blog.vivi.eng.br
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