Re: [PATCH 4/4] drm/i915: Remove begin/finish_crtc_commit, v2.

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Op 25-09-2019 om 23:42 schreef Matt Roper:
> On Wed, Sep 25, 2019 at 04:59:01PM +0200, Maarten Lankhorst wrote:
>> This can all be done from the intel_update_crtc function. Split out the
>> pipe update into a separate function, just like is done for the planes.
>> Pull in all the changes done during fastset as well. It makes no sense
>> for it to still exist as a separate function.
>>
>> Changes since v1:
>> - Inline intel_update_pipe_config()
>>
>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
>> ---
>>  drivers/gpu/drm/i915/display/intel_display.c | 197 ++++++++-----------
>>  1 file changed, 86 insertions(+), 111 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
>> index b77574cda648..5a9d06af9f29 100644
>> --- a/drivers/gpu/drm/i915/display/intel_display.c
>> +++ b/drivers/gpu/drm/i915/display/intel_display.c
>> @@ -136,8 +136,6 @@ static void vlv_prepare_pll(struct intel_crtc *crtc,
>>  			    const struct intel_crtc_state *pipe_config);
>>  static void chv_prepare_pll(struct intel_crtc *crtc,
>>  			    const struct intel_crtc_state *pipe_config);
>> -static void intel_begin_crtc_commit(struct intel_atomic_state *, struct intel_crtc *);
>> -static void intel_finish_crtc_commit(struct intel_atomic_state *, struct intel_crtc *);
>>  static void intel_crtc_init_scalers(struct intel_crtc *crtc,
>>  				    struct intel_crtc_state *crtc_state);
>>  static void skylake_pfit_enable(const struct intel_crtc_state *crtc_state);
>> @@ -4409,45 +4407,6 @@ static void icl_set_pipe_chicken(struct intel_crtc *crtc)
>>  	I915_WRITE(PIPE_CHICKEN(pipe), tmp);
>>  }
>>  
>> -static void intel_update_pipe_config(const struct intel_crtc_state *old_crtc_state,
>> -				     const struct intel_crtc_state *new_crtc_state)
>> -{
>> -	struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
>> -	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
>> -
>> -	/* drm_atomic_helper_update_legacy_modeset_state might not be called. */
>> -	crtc->base.mode = new_crtc_state->uapi.mode;
>> -
>> -	/*
>> -	 * Update pipe size and adjust fitter if needed: the reason for this is
>> -	 * that in compute_mode_changes we check the native mode (not the pfit
>> -	 * mode) to see if we can flip rather than do a full mode set. In the
>> -	 * fastboot case, we'll flip, but if we don't update the pipesrc and
>> -	 * pfit state, we'll end up with a big fb scanned out into the wrong
>> -	 * sized surface.
>> -	 */
>> -
>> -	I915_WRITE(PIPESRC(crtc->pipe),
>> -		   ((new_crtc_state->pipe_src_w - 1) << 16) |
>> -		   (new_crtc_state->pipe_src_h - 1));
>> -
>> -	/* on skylake this is done by detaching scalers */
>> -	if (INTEL_GEN(dev_priv) >= 9) {
>> -		skl_detach_scalers(new_crtc_state);
>> -
>> -		if (new_crtc_state->pch_pfit.enabled)
>> -			skylake_pfit_enable(new_crtc_state);
>> -	} else if (HAS_PCH_SPLIT(dev_priv)) {
>> -		if (new_crtc_state->pch_pfit.enabled)
>> -			ironlake_pfit_enable(new_crtc_state);
>> -		else if (old_crtc_state->pch_pfit.enabled)
>> -			ironlake_pfit_disable(old_crtc_state);
>> -	}
>> -
>> -	if (INTEL_GEN(dev_priv) >= 11)
>> -		icl_set_pipe_chicken(crtc);
>> -}
>> -
>>  static void intel_fdi_normal_train(struct intel_crtc *crtc)
>>  {
>>  	struct drm_device *dev = crtc->base.dev;
>> @@ -13739,13 +13698,88 @@ u32 intel_crtc_get_vblank_counter(struct intel_crtc *crtc)
>>  	return crtc->base.funcs->get_vblank_counter(&crtc->base);
>>  }
>>  
>> +void intel_crtc_arm_fifo_underrun(struct intel_crtc *crtc,
>> +				  struct intel_crtc_state *crtc_state)
>> +{
>> +	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
>> +
>> +	if (!IS_GEN(dev_priv, 2))
>> +		intel_set_cpu_fifo_underrun_reporting(dev_priv, crtc->pipe, true);
>> +
>> +	if (crtc_state->has_pch_encoder) {
>> +		enum pipe pch_transcoder =
>> +			intel_crtc_pch_transcoder(crtc);
>> +
>> +		intel_set_pch_fifo_underrun_reporting(dev_priv, pch_transcoder, true);
>> +	}
>> +}
>> +
>> +static void commit_pipe_config(struct intel_atomic_state *state,
>> +			       struct intel_crtc_state *old_crtc_state,
>> +			       struct intel_crtc_state *new_crtc_state)
>> +{
>> +	struct intel_crtc *crtc = to_intel_crtc(new_crtc_state->uapi.crtc);
>> +	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
>> +	bool modeset = needs_modeset(new_crtc_state);
>> +
>> +	if (!modeset) {
>> +		if (new_crtc_state->uapi.color_mgmt_changed ||
>> +		    new_crtc_state->update_pipe)
>> +			intel_color_commit(new_crtc_state);
>> +
>> +		if (INTEL_GEN(dev_priv) >= 9)
>> +			skl_detach_scalers(new_crtc_state);
>> +
>> +		if (new_crtc_state->update_pipe) {
>> +			/* drm_atomic_helper_update_legacy_modeset_state might not be called. */
>> +			crtc->base.mode = new_crtc_state->uapi.mode;
>> +
>> +			/*
>> +			 * Update pipe size and adjust fitter if needed: the reason for this is
>> +			 * that in compute_mode_changes we check the native mode (not the pfit
>> +			 * mode) to see if we can flip rather than do a full mode set. In the
>> +			 * fastboot case, we'll flip, but if we don't update the pipesrc and
>> +			 * pfit state, we'll end up with a big fb scanned out into the wrong
>> +			 * sized surface.
>> +			 */
>> +
>> +			I915_WRITE(PIPESRC(crtc->pipe),
>> +				  ((new_crtc_state->pipe_src_w - 1) << 16) |
>> +				  (new_crtc_state->pipe_src_h - 1));
> intel_set_pipe_src_size(new_crtc_state);
>
> to be more future-proof in case the register changes in the future.
>
>> +
>> +			if (INTEL_GEN(dev_priv) >= 9) {
>> +				/*
>> +				 * enable pipe scaler here if needed, if
>> +				 * it's disabled, that's done by
>> +				 * skl_detach_scalers() above.
>> +				 */
>> +				skylake_pfit_enable(new_crtc_state);
>> +			} else if (HAS_PCH_SPLIT(dev_priv)) {
>> +				if (!new_crtc_state->pch_pfit.enabled)
>> +					ironlake_pfit_disable(old_crtc_state);
>> +				else
>> +					ironlake_pfit_enable(new_crtc_state);
>> +			}
>> +
>> +			if (INTEL_GEN(dev_priv) >= 11)
>> +				icl_set_pipe_chicken(crtc);
>> +		}
>> +
>> +		if (INTEL_GEN(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
>> +			bdw_set_pipemisc(new_crtc_state);
>> +	}
>> +
>> +	if (dev_priv->display.atomic_update_watermarks)
>> +		dev_priv->display.atomic_update_watermarks(state,
>> +							   new_crtc_state);
> It might make sense to move the watermark update out to the caller.  The
> watermark registers themselves are plane-based, so dealing with them in
> the commit_pipe_config function is already slightly non-intuitive.  Plus
> that will let us just do a

atomic_update_watermarks just sets linetime on skl+. :)

Per plane watermarks are done in skl_write_plane_wm, called from skl_program_plane.

>
>         /*
>          * During modesets pipe configuration was programmed as the
>          * CRTC was enabled.
>          */
>         if (!modeset)
>                 return;
>
> and drop a level of nesting for the rest of this function.
Yeah can drop even more with a check for update_pipe.
>
>> +}
>> +
>>  static void intel_update_crtc(struct intel_crtc *crtc,
>>  			      struct intel_atomic_state *state,
>>  			      struct intel_crtc_state *old_crtc_state,
>>  			      struct intel_crtc_state *new_crtc_state)
>>  {
>> -	struct drm_device *dev = state->base.dev;
>> -	struct drm_i915_private *dev_priv = to_i915(dev);
>> +	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
>>  	bool modeset = needs_modeset(new_crtc_state);
>>  	struct intel_plane_state *new_plane_state =
>>  		intel_atomic_get_new_plane_state(state,
>> @@ -13769,14 +13803,21 @@ static void intel_update_crtc(struct intel_crtc *crtc,
>>  	else if (new_plane_state)
>>  		intel_fbc_enable(crtc, new_crtc_state, new_plane_state);
>>  
>> -	intel_begin_crtc_commit(state, crtc);
>> +	/* Perform vblank evasion around commit operation */
>> +	intel_pipe_update_start(new_crtc_state);
>> +
>> +	commit_pipe_config(state, old_crtc_state, new_crtc_state);
>>  
>>  	if (INTEL_GEN(dev_priv) >= 9)
>>  		skl_update_planes_on_crtc(state, crtc);
>>  	else
>>  		i9xx_update_planes_on_crtc(state, crtc);
>>  
>> -	intel_finish_crtc_commit(state, crtc);
>> +	intel_pipe_update_end(new_crtc_state);
>> +
>> +	if (new_crtc_state->update_pipe && !modeset &&
>> +	    old_crtc_state->hw.mode.private_flags & I915_MODE_FLAG_INHERITED)
>> +		intel_crtc_arm_fifo_underrun(crtc, new_crtc_state);
> It might be worth adding a comment to this block.  I always have to go
> dig back through git history to remind myself we this is needed.  Maybe
> something like:
>
>         /*
>          * We usually enable FIFO underrun interrupts as part of the
>          * CRTC enable sequence during modesets.  But when we inherit a
>          * valid pipe configuration from the BIOS we need to take care
>          * of enabling them on the CRTC's first fastset.
>          */
>
>
> Matt
>
>>  }
>>  
>>  static void intel_old_crtc_state_disables(struct intel_atomic_state *state,
>> @@ -14573,72 +14614,6 @@ skl_max_scale(const struct intel_crtc_state *crtc_state,
>>  	return max_scale;
>>  }
>>  
>> -static void intel_begin_crtc_commit(struct intel_atomic_state *state,
>> -				    struct intel_crtc *crtc)
>> -{
>> -	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
>> -	struct intel_crtc_state *old_crtc_state =
>> -		intel_atomic_get_old_crtc_state(state, crtc);
>> -	struct intel_crtc_state *new_crtc_state =
>> -		intel_atomic_get_new_crtc_state(state, crtc);
>> -	bool modeset = needs_modeset(new_crtc_state);
>> -
>> -	/* Perform vblank evasion around commit operation */
>> -	intel_pipe_update_start(new_crtc_state);
>> -
>> -	if (modeset)
>> -		goto out;
>> -
>> -	if (new_crtc_state->uapi.color_mgmt_changed ||
>> -	    new_crtc_state->update_pipe)
>> -		intel_color_commit(new_crtc_state);
>> -
>> -	if (new_crtc_state->update_pipe)
>> -		intel_update_pipe_config(old_crtc_state, new_crtc_state);
>> -	else if (INTEL_GEN(dev_priv) >= 9)
>> -		skl_detach_scalers(new_crtc_state);
>> -
>> -	if (INTEL_GEN(dev_priv) >= 9 || IS_BROADWELL(dev_priv))
>> -		bdw_set_pipemisc(new_crtc_state);
>> -
>> -out:
>> -	if (dev_priv->display.atomic_update_watermarks)
>> -		dev_priv->display.atomic_update_watermarks(state,
>> -							   new_crtc_state);
>> -}
>> -
>> -void intel_crtc_arm_fifo_underrun(struct intel_crtc *crtc,
>> -				  struct intel_crtc_state *crtc_state)
>> -{
>> -	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
>> -
>> -	if (!IS_GEN(dev_priv, 2))
>> -		intel_set_cpu_fifo_underrun_reporting(dev_priv, crtc->pipe, true);
>> -
>> -	if (crtc_state->has_pch_encoder) {
>> -		enum pipe pch_transcoder =
>> -			intel_crtc_pch_transcoder(crtc);
>> -
>> -		intel_set_pch_fifo_underrun_reporting(dev_priv, pch_transcoder, true);
>> -	}
>> -}
>> -
>> -static void intel_finish_crtc_commit(struct intel_atomic_state *state,
>> -				     struct intel_crtc *crtc)
>> -{
>> -	struct intel_crtc_state *old_crtc_state =
>> -		intel_atomic_get_old_crtc_state(state, crtc);
>> -	struct intel_crtc_state *new_crtc_state =
>> -		intel_atomic_get_new_crtc_state(state, crtc);
>> -
>> -	intel_pipe_update_end(new_crtc_state);
>> -
>> -	if (new_crtc_state->update_pipe &&
>> -	    !needs_modeset(new_crtc_state) &&
>> -	    old_crtc_state->hw.mode.private_flags & I915_MODE_FLAG_INHERITED)
>> -		intel_crtc_arm_fifo_underrun(crtc, new_crtc_state);
>> -}
>> -
>>  /**
>>   * intel_plane_destroy - destroy a plane
>>   * @plane: plane to destroy
>> -- 
>> 2.20.1
>>
>> _______________________________________________
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>> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
>> https://lists.freedesktop.org/mailman/listinfo/intel-gfx


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