[Intel-gfx] [PATCH 31/67] drm/i915/cnl: Allow dynamic cdclk changes on CNL
Rodrigo Vivi
rodrigo.vivi at gmail.com
Tue Jun 6 21:57:22 UTC 2017
On Tue, Jun 6, 2017 at 2:48 PM, Pandiyan, Dhinakaran
<dhinakaran.pandiyan at intel.com> wrote:
> On Tue, 2017-06-06 at 11:12 -0700, Rodrigo Vivi wrote:
>> 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?
>>
>
> I completely forgot about that patch, makes sense to squash that here.
squashed locally here... I will send out on next chunck...
>
>
>
>> >
>> >>
>> >> -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
>> >>> > Intel-gfx at lists.freedesktop.org
>> >>> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>> >>>
>> >>>
>> >>>
>> >>
>> >
>> >
>> >
>> > --
>> > Rodrigo Vivi
>> > Blog: http://blog.vivi.eng.br
>>
>>
>>
>
--
Rodrigo Vivi
Blog: http://blog.vivi.eng.br
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