[Intel-gfx] [PATCH v2 12/13] drm/i915: Use bigjoiner_pipes more

[Navare, Manasi]

On Wed, Feb 23, 2022 at 03:13:14PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Replace the hardcoded 2 pipe assumptions when we're massaging
> pipe_mode and the pipe_src rect to be suitable for bigjoiner.
> Instead we can just count the number of pipes in the bitmask.
> 
> v2: Introduce intel_bigjoiner_num_pipes()
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 31 +++++++++++++-------
>  1 file changed, 20 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 9b4013ed3d98..7a09bb33c1eb 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -368,6 +368,11 @@ bool intel_crtc_is_bigjoiner_master(const struct intel_crtc_state *crtc_state)
>  		crtc->pipe == bigjoiner_master_pipe(crtc_state);
>  }
>  
> +static int intel_bigjoiner_num_pipes(const struct intel_crtc_state *crtc_state)
> +{
> +	return hweight8(crtc_state->bigjoiner_pipes);
> +}

Okay yes makes sense. Although bigjoiner will always be between just 2 pipes so why not hardcode to 2 and
use the  if (!crtc_state->bigjoiner_pipes) as the check instead of num_pipes < 2.
When we have a joiner for 4 pipes, in that case also bigjoiner will still be only between 2 pipes.
So in bigjoiner_pipe mask, it will always only have 2 pipes.

Manasi

> +
>  struct intel_crtc *intel_master_crtc(const struct intel_crtc_state *crtc_state)
>  {
>  	struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
> @@ -2731,16 +2736,18 @@ static void intel_crtc_compute_pixel_rate(struct intel_crtc_state *crtc_state)
>  static void intel_bigjoiner_adjust_timings(const struct intel_crtc_state *crtc_state,
>  					   struct drm_display_mode *mode)
>  {
> -	if (!crtc_state->bigjoiner_pipes)
> +	int num_pipes = intel_bigjoiner_num_pipes(crtc_state);
> +
> +	if (num_pipes < 2)
>  		return;
>  
> -	mode->crtc_clock /= 2;
> -	mode->crtc_hdisplay /= 2;
> -	mode->crtc_hblank_start /= 2;
> -	mode->crtc_hblank_end /= 2;
> -	mode->crtc_hsync_start /= 2;
> -	mode->crtc_hsync_end /= 2;
> -	mode->crtc_htotal /= 2;
> +	mode->crtc_clock /= num_pipes;
> +	mode->crtc_hdisplay /= num_pipes;
> +	mode->crtc_hblank_start /= num_pipes;
> +	mode->crtc_hblank_end /= num_pipes;
> +	mode->crtc_hsync_start /= num_pipes;
> +	mode->crtc_hsync_end /= num_pipes;
> +	mode->crtc_htotal /= num_pipes;
>  }
>  
>  static void intel_splitter_adjust_timings(const struct intel_crtc_state *crtc_state,
> @@ -2792,7 +2799,8 @@ static void intel_crtc_readout_derived_state(struct intel_crtc_state *crtc_state
>  	/* Populate the "user" mode with full numbers */
>  	drm_mode_copy(mode, pipe_mode);
>  	intel_mode_from_crtc_timings(mode, mode);
> -	mode->hdisplay = drm_rect_width(&crtc_state->pipe_src) << !!crtc_state->bigjoiner_pipes;
> +	mode->hdisplay = drm_rect_width(&crtc_state->pipe_src) *
> +		(intel_bigjoiner_num_pipes(crtc_state) ?: 1);
>  	mode->vdisplay = drm_rect_height(&crtc_state->pipe_src);
>  
>  	/* Derive per-pipe timings in case bigjoiner is used */
> @@ -2812,16 +2820,17 @@ static void intel_encoder_get_config(struct intel_encoder *encoder,
>  
>  static void intel_bigjoiner_compute_pipe_src(struct intel_crtc_state *crtc_state)
>  {
> +	int num_pipes = intel_bigjoiner_num_pipes(crtc_state);
>  	int width, height;
>  
> -	if (!crtc_state->bigjoiner_pipes)
> +	if (num_pipes < 2)
>  		return;
>  
>  	width = drm_rect_width(&crtc_state->pipe_src);
>  	height = drm_rect_height(&crtc_state->pipe_src);
>  
>  	drm_rect_init(&crtc_state->pipe_src, 0, 0,
> -		      width / 2, height);
> +		      width / num_pipes, height);
>  }
>  
>  static int intel_crtc_compute_pipe_src(struct intel_crtc_state *crtc_state)
> -- 
> 2.34.1
>