Re: [PATCH 5/5] drm/sun4i: Add support for the overscan profiles

[Daniel Vetter <daniel@ffwll.ch>]

On Tue, Oct 18, 2016 at 10:29:38AM +0200, Maxime Ripard wrote:
> Create overscan profiles reducing the displayed zone.
> 
> For each TV standard (PAL and NTSC so far), we create 4 more reduced modes
> by steps of 5% that the user will be able to select.
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

tbh I think if we agree to do this (and that still seems an open question)
I think there should be a generic helper to add these overscan modes with
increased porches. Anything that only depends upon the sink (and
overscanning is something the sink does) should imo be put into a suitable
helper library for everyone to share.

Or maybe even stash it into the probe helpers and call it for all TV
connectors. Definitely not a driver-private thing.
-Daniel
> ---
>  drivers/gpu/drm/sun4i/sun4i_tv.c | 60 +++++++++++++++++++--------------
>  1 file changed, 36 insertions(+), 24 deletions(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_tv.c b/drivers/gpu/drm/sun4i/sun4i_tv.c
> index f99886462cb8..9ee03ba086b6 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_tv.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_tv.c
> @@ -301,27 +301,33 @@ static const struct tv_mode *sun4i_tv_find_tv_by_mode(const struct drm_display_m
>  		DRM_DEBUG_DRIVER("Comparing mode %s vs %s",
>  				 mode->name, tv_mode->name);
>  
> -		if (!strcmp(mode->name, tv_mode->name))
> +		if (!strncmp(mode->name, tv_mode->name, strlen(tv_mode->name)))
>  			return tv_mode;
>  	}
>  
>  	/* Then by number of lines */
>  	for (i = 0; i < ARRAY_SIZE(tv_modes); i++) {
>  		const struct tv_mode *tv_mode = &tv_modes[i];
> +		int j;
>  
> -		DRM_DEBUG_DRIVER("Comparing mode %s vs %s (X: %d vs %d)",
> -				 mode->name, tv_mode->name,
> -				 mode->vdisplay, tv_mode->vdisplay);
> +		for (j = 0; j < 20; j += 5) {
> +			u32 vdisplay = tv_mode->vdisplay * (100 - j) / 100;
>  
> -		if (mode->vdisplay == tv_mode->vdisplay)
> -			return tv_mode;
> +			DRM_DEBUG_DRIVER("Comparing mode with %s (%d) (X: %d vs %d)",
> +					 tv_mode->name, j,
> +					 vdisplay, tv_mode->vdisplay);
> +
> +			if (vdisplay == tv_mode->vdisplay)
> +				return tv_mode;
> +		}
>  	}
>  
>  	return NULL;
>  }
>  
>  static void sun4i_tv_mode_to_drm_mode(const struct tv_mode *tv_mode,
> -				      struct drm_display_mode *mode)
> +				      struct drm_display_mode *mode,
> +				      int overscan)
>  {
>  	DRM_DEBUG_DRIVER("Creating mode %s\n", mode->name);
>  
> @@ -329,12 +335,12 @@ static void sun4i_tv_mode_to_drm_mode(const struct tv_mode *tv_mode,
>  	mode->clock = 13500;
>  	mode->flags = DRM_MODE_FLAG_INTERLACE;
>  
> -	mode->hdisplay = tv_mode->hdisplay;
> +	mode->hdisplay = tv_mode->hdisplay * (100 - overscan) / 100;
>  	mode->hsync_start = mode->hdisplay + tv_mode->hfront_porch;
>  	mode->hsync_end = mode->hsync_start + tv_mode->hsync_len;
>  	mode->htotal = mode->hsync_end  + tv_mode->hback_porch;
>  
> -	mode->vdisplay = tv_mode->vdisplay;
> +	mode->vdisplay = tv_mode->vdisplay * (100 - overscan) / 100;
>  	mode->vsync_start = mode->vdisplay + tv_mode->vfront_porch;
>  	mode->vsync_end = mode->vsync_start + tv_mode->vsync_len;
>  	mode->vtotal = mode->vsync_end  + tv_mode->vback_porch;
> @@ -352,10 +358,10 @@ static int sun4i_tv_atomic_check(struct drm_encoder *encoder,
>  		return -EINVAL;
>  
>  	state->display_x_size = tv_mode->hdisplay;
> -	state->plane_x_offset = 0;
> +	state->plane_x_offset = (tv_mode->hdisplay - mode->hdisplay) / 2;
>  
>  	state->display_y_size = tv_mode->vdisplay;
> -	state->plane_y_offset = 0;
> +	state->plane_y_offset = (tv_mode->vdisplay - mode->vdisplay) / 2;
>  
>  	return 0;
>  }
> @@ -404,7 +410,7 @@ static void sun4i_tv_mode_set(struct drm_encoder *encoder,
>  	struct drm_display_mode tv_drm_mode = { 0 };
>  
>  	strcpy(tv_drm_mode.name, "TV");
> -	sun4i_tv_mode_to_drm_mode(tv_mode, &tv_drm_mode);
> +	sun4i_tv_mode_to_drm_mode(tv_mode, &tv_drm_mode, 0);
>  	drm_mode_set_crtcinfo(&tv_drm_mode, CRTC_INTERLACE_HALVE_V);
>  
>  	sun4i_tcon1_mode_set(tcon, &tv_drm_mode);
> @@ -526,22 +532,28 @@ static int sun4i_tv_comp_get_modes(struct drm_connector *connector)
>  	int i;
>  
>  	for (i = 0; i < ARRAY_SIZE(tv_modes); i++) {
> -		struct drm_display_mode *mode;
>  		const struct tv_mode *tv_mode = &tv_modes[i];
> -
> -		mode = drm_mode_create(connector->dev);
> -		if (!mode) {
> -			DRM_ERROR("Failed to create a new display mode\n");
> -			return 0;
> +		int j;
> +
> +		for (j = 0; j < 20; j += 5) {
> +			struct drm_display_mode *mode = drm_mode_create(connector->dev);
> +			if (!mode) {
> +				DRM_ERROR("Failed to create a new display mode\n");
> +				return 0;
> +			}
> +
> +			if (j)
> +				sprintf(mode->name, "%s%d", tv_mode->name,
> +					j);
> +			else
> +				strcpy(mode->name, tv_mode->name);
> +
> +			sun4i_tv_mode_to_drm_mode(tv_mode, mode, j);
> +			drm_mode_probed_add(connector, mode);
>  		}
> -
> -		strcpy(mode->name, tv_mode->name);
> -
> -		sun4i_tv_mode_to_drm_mode(tv_mode, mode);
> -		drm_mode_probed_add(connector, mode);
>  	}
>  
> -	return i;
> +	return i * 4;
>  }
>  
>  static int sun4i_tv_comp_mode_valid(struct drm_connector *connector,
> -- 
> git-series 0.8.10
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch