[Intel-gfx] [PATCH 02/24] drm/i915: Add some more tracked state to intel_pipe_wm

[Paulo Zanoni]

2014-03-07 13:32 GMT-03:00  <ville.syrjala at linux.intel.com>:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> intel_pipe_wm will be used to track the state in different stages
> of the watermark update process. For that we need to keep a bit
> more state in intel_pipe_wm.
>
> We also need to separate the multi-pipe intel_wm_config computation
> from ilk_compute_wm_parameters() as that one deals with the future
> state, and we need the intel_wm_config to match the current hardware
> state at the time we do the watermark merging for multiple pipes.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Needs minor rebase, but looks correct.

<insert complaint about the fact that the watermarks code is pretty
complex these days>

Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>

> ---
>  drivers/gpu/drm/i915/intel_drv.h |  3 ++
>  drivers/gpu/drm/i915/intel_pm.c  | 64 +++++++++++++++++++++++++++-------------
>  2 files changed, 46 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 8c9892d..f022a78 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -333,6 +333,9 @@ struct intel_pipe_wm {
>         struct intel_wm_level wm[5];
>         uint32_t linetime;
>         bool fbc_wm_enabled;
> +       bool pipe_enabled;
> +       bool sprites_enabled;
> +       bool sprites_scaled;
>  };
>
>  struct intel_crtc {
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 26c79ed..e0d1c8b 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -2105,38 +2105,52 @@ static void intel_setup_wm_latency(struct drm_device *dev)
>  }
>
>  static void ilk_compute_wm_parameters(struct drm_crtc *crtc,
> -                                     struct ilk_pipe_wm_parameters *p,
> -                                     struct intel_wm_config *config)
> +                                     struct ilk_pipe_wm_parameters *p)
>  {
>         struct drm_device *dev = crtc->dev;
>         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
>         enum pipe pipe = intel_crtc->pipe;
>         struct drm_plane *plane;
>
> -       p->active = intel_crtc_active(crtc);
> -       if (p->active) {
> -               p->pipe_htotal = intel_crtc->config.adjusted_mode.crtc_htotal;
> -               p->pixel_rate = ilk_pipe_pixel_rate(dev, crtc);
> -               p->pri.bytes_per_pixel = crtc->fb->bits_per_pixel / 8;
> -               p->cur.bytes_per_pixel = 4;
> -               p->pri.horiz_pixels = intel_crtc->config.pipe_src_w;
> -               p->cur.horiz_pixels = 64;
> -               /* TODO: for now, assume primary and cursor planes are always enabled. */
> -               p->pri.enabled = true;
> -               p->cur.enabled = true;
> -       }
> +       if (!intel_crtc_active(crtc))
> +               return;
>
> -       list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
> -               config->num_pipes_active += intel_crtc_active(crtc);
> +       p->active = true;
> +       p->pipe_htotal = intel_crtc->config.adjusted_mode.crtc_htotal;
> +       p->pixel_rate = ilk_pipe_pixel_rate(dev, crtc);
> +       p->pri.bytes_per_pixel = crtc->fb->bits_per_pixel / 8;
> +       p->cur.bytes_per_pixel = 4;
> +       p->pri.horiz_pixels = intel_crtc->config.pipe_src_w;
> +       p->cur.horiz_pixels = 64;
> +       /* TODO: for now, assume primary and cursor planes are always enabled. */
> +       p->pri.enabled = true;
> +       p->cur.enabled = true;
>
>         list_for_each_entry(plane, &dev->mode_config.plane_list, head) {
>                 struct intel_plane *intel_plane = to_intel_plane(plane);
>
> -               if (intel_plane->pipe == pipe)
> +               if (intel_plane->pipe == pipe) {
>                         p->spr = intel_plane->wm;
> +                       break;
> +               }
> +       }
> +}
>
> -               config->sprites_enabled |= intel_plane->wm.enabled;
> -               config->sprites_scaled |= intel_plane->wm.scaled;
> +static void ilk_compute_wm_config(struct drm_device *dev,
> +                                 struct intel_wm_config *config)
> +{
> +       struct intel_crtc *intel_crtc;
> +
> +       /* Compute the currently _active_ config */
> +       list_for_each_entry(intel_crtc, &dev->mode_config.crtc_list, base.head) {
> +               const struct intel_pipe_wm *wm = &intel_crtc->wm.active;
> +
> +               if (!wm->pipe_enabled)
> +                       continue;
> +
> +               config->sprites_enabled |= wm->sprites_enabled;
> +               config->sprites_scaled |= wm->sprites_scaled;
> +               config->num_pipes_active++;
>         }
>  }
>
> @@ -2159,6 +2173,10 @@ static bool intel_compute_pipe_wm(struct drm_crtc *crtc,
>         /* LP0 watermarks always use 1/2 DDB partitioning */
>         ilk_compute_wm_maximums(dev, 0, &config, INTEL_DDB_PART_1_2, &max);
>
> +       pipe_wm->pipe_enabled = params->active;
> +       pipe_wm->sprites_enabled = params->spr.enabled;
> +       pipe_wm->sprites_scaled = params->spr.scaled;
> +
>         /* ILK/SNB: LP2+ watermarks only w/o sprites */
>         if (INTEL_INFO(dev)->gen <= 6 && params->spr.enabled)
>                 max_level = 1;
> @@ -2548,7 +2566,7 @@ static void ilk_update_wm(struct drm_crtc *crtc)
>         struct intel_pipe_wm lp_wm_1_2 = {}, lp_wm_5_6 = {}, *best_lp_wm;
>         struct intel_wm_config config = {};
>
> -       ilk_compute_wm_parameters(crtc, &params, &config);
> +       ilk_compute_wm_parameters(crtc, &params);
>
>         intel_compute_pipe_wm(crtc, &params, &pipe_wm);
>
> @@ -2557,6 +2575,8 @@ static void ilk_update_wm(struct drm_crtc *crtc)
>
>         intel_crtc->wm.active = pipe_wm;
>
> +       ilk_compute_wm_config(dev, &config);
> +
>         ilk_compute_wm_maximums(dev, 1, &config, INTEL_DDB_PART_1_2, &max);
>         ilk_wm_merge(dev, &config, &max, &lp_wm_1_2);
>
> @@ -2623,7 +2643,9 @@ static void ilk_pipe_wm_get_hw_state(struct drm_crtc *crtc)
>         if (IS_HASWELL(dev) || IS_BROADWELL(dev))
>                 hw->wm_linetime[pipe] = I915_READ(PIPE_WM_LINETIME(pipe));
>
> -       if (intel_crtc_active(crtc)) {
> +       active->pipe_enabled = intel_crtc_active(crtc);
> +
> +       if (active->pipe_enabled) {
>                 u32 tmp = hw->wm_pipe[pipe];
>
>                 /*
> --
> 1.8.3.2
>
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-- 
Paulo Zanoni