Re: [Intel-gfx] [PATCH 2/3] drm/atomic-helper: Remove the timestamping constant update from drm_atomic_helper_update_legacy_modeset_state()

[Daniel Vetter <daniel@ffwll.ch>]

On Mon, Sep 07, 2020 at 03:00:25PM +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> The timestamping constants have nothing to do with any legacy state
> so should not be updated from
> drm_atomic_helper_update_legacy_modeset_state().
> 
> Let's make everyone call drm_atomic_helper_calc_timestamping_constants()
> directly instead of relying on
> drm_atomic_helper_update_legacy_modeset_state() to call it.
> 
> @@
> expression S;
> @@
> - drm_atomic_helper_calc_timestamping_constants(S);
> 
> @@
> expression D, S;
> @@
>   drm_atomic_helper_update_legacy_modeset_state(D, S);
> + drm_atomic_helper_calc_timestamping_constants(S);
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

I think the kerneldoc for
drm_crtc_vblank_helper_get_vblank/_timestamp_internal (both of them) also
needs to be updated to mention the new function. With that fixed:

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>


> ---
>  drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 1 +
>  drivers/gpu/drm/drm_atomic_helper.c               | 7 ++-----
>  drivers/gpu/drm/i915/display/intel_display.c      | 1 +
>  drivers/gpu/drm/nouveau/dispnv50/disp.c           | 1 +
>  4 files changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> index 490684787cff..0511097343da 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -7397,6 +7397,7 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
>  	int crtc_disable_count = 0;
>  
>  	drm_atomic_helper_update_legacy_modeset_state(dev, state);
> +	drm_atomic_helper_calc_timestamping_constants(state);
>  
>  	dm_state = dm_atomic_get_new_state(state);
>  	if (dm_state && dm_state->context) {
> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
> index 673e3fc282d9..45ee613c8efd 100644
> --- a/drivers/gpu/drm/drm_atomic_helper.c
> +++ b/drivers/gpu/drm/drm_atomic_helper.c
> @@ -1115,9 +1115,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
>   * @old_state: atomic state object with old state structures
>   *
>   * This function updates all the various legacy modeset state pointers in
> - * connectors, encoders and CRTCs. It also updates the timestamping constants
> - * used for precise vblank timestamps by calling
> - * drm_calc_timestamping_constants().
> + * connectors, encoders and CRTCs.
>   *
>   * Drivers can use this for building their own atomic commit if they don't have
>   * a pure helper-based modeset implementation.
> @@ -1187,8 +1185,6 @@ drm_atomic_helper_update_legacy_modeset_state(struct drm_device *dev,
>  			crtc->y = new_plane_state->src_y >> 16;
>  		}
>  	}
> -
> -	drm_atomic_helper_calc_timestamping_constants(old_state);
>  }
>  EXPORT_SYMBOL(drm_atomic_helper_update_legacy_modeset_state);
>  
> @@ -1296,6 +1292,7 @@ void drm_atomic_helper_commit_modeset_disables(struct drm_device *dev,
>  	disable_outputs(dev, old_state);
>  
>  	drm_atomic_helper_update_legacy_modeset_state(dev, old_state);
> +	drm_atomic_helper_calc_timestamping_constants(old_state);
>  
>  	crtc_set_mode(dev, old_state);
>  }
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index ec148a8da2c2..035840ce3825 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -15578,6 +15578,7 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>  
>  	if (state->modeset) {
>  		drm_atomic_helper_update_legacy_modeset_state(dev, &state->base);
> +		drm_atomic_helper_calc_timestamping_constants(&state->base);
>  
>  		intel_set_cdclk_pre_plane_update(state);
>  
> diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> index 7799530e07c1..b6d1b926bc5e 100644
> --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
> +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> @@ -2069,6 +2069,7 @@ nv50_disp_atomic_commit_tail(struct drm_atomic_state *state)
>  	drm_atomic_helper_wait_for_fences(dev, state, false);
>  	drm_atomic_helper_wait_for_dependencies(state);
>  	drm_atomic_helper_update_legacy_modeset_state(dev, state);
> +	drm_atomic_helper_calc_timestamping_constants(state);
>  
>  	if (atom->lock_core)
>  		mutex_lock(&disp->mutex);
> -- 
> 2.26.2
> 
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> Intel-gfx@lists.freedesktop.org
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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