[Intel-gfx] [RFC PATCH 8/8] drm/i915: Calculate vlv/chv intermediate watermarks correctly, v3.

[Maarten Lankhorst]

Op 20-07-17 om 15:15 schreef Maarten Lankhorst:
> The watermarks it should calculate against are the old optimal watermarks.
> The currently active crtc watermarks are pure fiction, and are invalid in
> case of a nonblocking modeset, page flip enabling/disabling planes or any
> other reason.
>
> When the crtc is disabled or during a modeset the intermediate watermarks
> don't need to be programmed separately, and could be directly assigned
> to the optimal watermarks.
>
> CXSR must always be disabled in the intermediate case for modesets, else
> we get a WARN for vblank wait timeout.
>
> Also rename crtc_state to new_crtc_state, to distinguish it from the old state.
>
> Changes since v1:
> - Use intel_atomic_get_old_crtc_state. (ville)
> Changes since v2:
> - Always unset cxsr during modeset.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101597
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 22 ++++++++++++++++------
>  1 file changed, 16 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 0048bf043337..96de4f8e3b2a 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -2004,16 +2004,25 @@ static void vlv_atomic_update_fifo(struct intel_atomic_state *state,
>  
>  static int vlv_compute_intermediate_wm(struct drm_device *dev,
>  				       struct intel_crtc *crtc,
> -				       struct intel_crtc_state *crtc_state)
> +				       struct intel_crtc_state *new_crtc_state)
>  {
> -	struct vlv_wm_state *intermediate = &crtc_state->wm.vlv.intermediate;
> -	const struct vlv_wm_state *optimal = &crtc_state->wm.vlv.optimal;
> -	const struct vlv_wm_state *active = &crtc->wm.active.vlv;
> +	struct vlv_wm_state *intermediate = &new_crtc_state->wm.vlv.intermediate;
> +	const struct vlv_wm_state *optimal = &new_crtc_state->wm.vlv.optimal;
> +	const struct intel_crtc_state *old_crtc_state =
> +		intel_atomic_get_old_crtc_state(new_crtc_state->base.state, crtc);
> +	const struct vlv_wm_state *active = &old_crtc_state->wm.vlv.optimal;
>  	int level;
>  
> +	if (!new_crtc_state->base.active || drm_atomic_crtc_needs_modeset(&new_crtc_state->base)) {
> +		*intermediate = *optimal;
> +
> +		intermediate->cxsr = false;
> +		goto out;
> +	}
Derp, can't fix the above bug since it's PNV.. But still needs to be done here.

So I'll have to take out the bugzilla listed above..