On Tue, Apr 07, 2020 at 10:33:56AM +0300, Stanislav Lisovskiy wrote:
> We need to calculate cdclk after watermarks/ddb has been calculated
> as with recent hw CDCLK needs to be adjusted accordingly to DBuf
> requirements, which is not possible with current code organization.
>
> Setting CDCLK according to DBuf BW requirements and not just rejecting
> if it doesn't satisfy BW requirements, will allow us to save power when
> it is possible and gain additional bandwidth when it's needed - i.e
> boosting both our power management and perfomance capabilities.
>
> This patch is preparation for that, first we now extract modeset
> calculation from modeset checks, in order to call it after wm/ddb
> has been calculated.
>
> v2: - Extract only intel_modeset_calc_cdclk from intel_modeset_checks
> (Ville Syrjälä)
>
> v3: - Clear plls after intel_modeset_calc_cdclk
Why did we change this now?
>
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 22 +++++++++++---------
> 1 file changed, 12 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 70ec301fe6e3..c77088e1d033 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -14464,12 +14464,6 @@ static int intel_modeset_checks(struct intel_atomic_state *state)
> return ret;
> }
>
> - ret = intel_modeset_calc_cdclk(state);
> - if (ret)
> - return ret;
> -
> - intel_modeset_clear_plls(state);
> -
> if (IS_HASWELL(dev_priv))
> return hsw_mode_set_planes_workaround(state);
>
> @@ -14801,10 +14795,6 @@ static int intel_atomic_check(struct drm_device *dev,
> goto fail;
> }
>
> - ret = intel_atomic_check_crtcs(state);
> - if (ret)
> - goto fail;
> -
> intel_fbc_choose_crtc(dev_priv, state);
> ret = calc_watermark_data(state);
> if (ret)
> @@ -14814,6 +14804,18 @@ static int intel_atomic_check(struct drm_device *dev,
> if (ret)
> goto fail;
>
> + if (any_ms) {
> + ret = intel_modeset_calc_cdclk(state);
> + if (ret)
> + return ret;
> +
> + intel_modeset_clear_plls(state);
> + }
> +
> + ret = intel_atomic_check_crtcs(state);
> + if (ret)
> + goto fail;
> +
> for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> new_crtc_state, i) {
> if (!needs_modeset(new_crtc_state) &&
> --
> 2.24.1.485.gad05a3d8e5
--
Ville Syrjälä
Intel
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