Re: [Intel-gfx] [PATCH 2/2] drm: Check the fb size against the adjusted v/hdisplay for stereo modes

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Mon, Sep 23, 2013 at 03:57:40PM +0100, Damien Lespiau wrote:
> Some stereo modes, like frame packing, need a larger CRTC viewport than
> the "natural" underlying 2D mode and thus drm_crtc_check_viewport()
> needs to query the adjusted mode to use the correct h/vdisplay.
> 
> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
> ---
>  drivers/gpu/drm/drm_crtc.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
> index db05864..807309f 100644
> --- a/drivers/gpu/drm/drm_crtc.c
> +++ b/drivers/gpu/drm/drm_crtc.c
> @@ -2078,6 +2078,14 @@ static int drm_crtc_check_viewport(const struct drm_crtc *crtc,
>  	hdisplay = mode->hdisplay;
>  	vdisplay = mode->vdisplay;
>  
> +	if (drm_mode_is_stereo(mode)) {
> +		struct drm_display_mode adjusted = *mode;
> +
> +		drm_mode_set_crtcinfo(&adjusted, CRTC_STEREO_DOUBLE);
> +		hdisplay = adjusted.crtc_hdisplay;
> +		vdisplay = adjusted.crtc_vdisplay;
> +	}

Yeah, I think this is as good as we can do in generic code. Normally
the driver is free to adjust the non-visible portion of the timings,
but with frame packing the non-visible part also affects the viewport
size, so drivers supporting frame packing simply have to be more
careful how they adjust the timings, or they need to do another check
after the adjustments are done.

For the series:
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> +
>  	if (crtc->invert_dimensions)
>  		swap(hdisplay, vdisplay);
>  
> -- 
> 1.8.3.1
> 
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-- 
Ville Syrjälä
Intel OTC