[Intel-gfx] [PATCH 03/12] drm/i915: Extract intel_crtc_vblank_evade_scanlines()

[Golani, Mitulkumar Ajitkumar]

> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of Ville
> Syrjala
> Sent: 01 September 2023 18:35
> To: intel-gfx at lists.freedesktop.org
> Subject: [Intel-gfx] [PATCH 03/12] drm/i915: Extract
> intel_crtc_vblank_evade_scanlines()
> 
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Pull the vblank evasion scanline calculations into their own helper to
> declutter intel_pipe_update_start() a bit.
> 
> Reviewed-by: Manasi Navare <navaremanasi at chromium.org>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_crtc.c | 53 +++++++++++++----------
>  1 file changed, 31 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_crtc.c
> b/drivers/gpu/drm/i915/display/intel_crtc.c
> index 461949b48411..e46a15d59d79 100644
> --- a/drivers/gpu/drm/i915/display/intel_crtc.c
> +++ b/drivers/gpu/drm/i915/display/intel_crtc.c
> @@ -468,6 +468,36 @@ static int intel_mode_vblank_start(const struct
> drm_display_mode *mode)
>  	return vblank_start;
>  }
> 
> +static void intel_crtc_vblank_evade_scanlines(struct intel_atomic_state
> *state,
> +					      struct intel_crtc *crtc,
> +					      int *min, int *max, int
> *vblank_start) {
> +	const struct intel_crtc_state *new_crtc_state =
> +		intel_atomic_get_new_crtc_state(state, crtc);
> +	const struct drm_display_mode *adjusted_mode =
> +&new_crtc_state->hw.adjusted_mode;
> +
> +	if (new_crtc_state->vrr.enable) {
> +		if (intel_vrr_is_push_sent(new_crtc_state))
> +			*vblank_start =
> intel_vrr_vmin_vblank_start(new_crtc_state);
> +		else
> +			*vblank_start =
> intel_vrr_vmax_vblank_start(new_crtc_state);
> +	} else {
> +		*vblank_start = intel_mode_vblank_start(adjusted_mode);
> +	}
> +
> +	/* FIXME needs to be calibrated sensibly */
> +	*min = *vblank_start - intel_usecs_to_scanlines(adjusted_mode,
> +
> 	VBLANK_EVASION_TIME_US);
> +	*max = *vblank_start - 1;
> +
> +	/*
> +	 * M/N is double buffered on the transcoder's undelayed vblank,
> +	 * so with seamless M/N we must evade both vblanks.
> +	 */
> +	if (new_crtc_state->seamless_m_n &&
> intel_crtc_needs_fastset(new_crtc_state))
> +		*min -= adjusted_mode->crtc_vblank_start -
> +adjusted_mode->crtc_vdisplay; }
> +
>  /**
>   * intel_pipe_update_start() - start update of a set of display registers
>   * @state: the atomic state
> @@ -487,7 +517,6 @@ void intel_pipe_update_start(struct
> intel_atomic_state *state,
>  	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
>  	struct intel_crtc_state *new_crtc_state =
>  		intel_atomic_get_new_crtc_state(state, crtc);
> -	const struct drm_display_mode *adjusted_mode = &new_crtc_state-
> >hw.adjusted_mode;
>  	long timeout = msecs_to_jiffies_timeout(1);
>  	int scanline, min, max, vblank_start;
>  	wait_queue_head_t *wq = drm_crtc_vblank_waitqueue(&crtc-
> >base);
> @@ -503,27 +532,7 @@ void intel_pipe_update_start(struct
> intel_atomic_state *state,
>  	if (intel_crtc_needs_vblank_work(new_crtc_state))
>  		intel_crtc_vblank_work_init(new_crtc_state);
> 
> -	if (new_crtc_state->vrr.enable) {
> -		if (intel_vrr_is_push_sent(new_crtc_state))
> -			vblank_start =
> intel_vrr_vmin_vblank_start(new_crtc_state);
> -		else
> -			vblank_start =
> intel_vrr_vmax_vblank_start(new_crtc_state);
> -	} else {
> -		vblank_start = intel_mode_vblank_start(adjusted_mode);
> -	}
> -
> -	/* FIXME needs to be calibrated sensibly */
> -	min = vblank_start - intel_usecs_to_scanlines(adjusted_mode,
> -
> VBLANK_EVASION_TIME_US);
> -	max = vblank_start - 1;
> -
> -	/*
> -	 * M/N is double buffered on the transcoder's undelayed vblank,
> -	 * so with seamless M/N we must evade both vblanks.
> -	 */
> -	if (new_crtc_state->seamless_m_n &&
> intel_crtc_needs_fastset(new_crtc_state))
> -		min -= adjusted_mode->crtc_vblank_start - adjusted_mode-
> >crtc_vdisplay;
> -
> +	intel_crtc_vblank_evade_scanlines(state, crtc, &min, &max,
> +&vblank_start);

Reviewed-by: Mitul Golani <mitulkumar.ajitkumar.golani at intel.com>
>  	if (min <= 0 || max <= 0)
>  		goto irq_disable;
> 
> --
> 2.41.0