[Intel-gfx] [PATCH v2 2/4] drm: Add aspect ratio parsing in DRM layer

[Jim Bride]

On Tue, Aug 09, 2016 at 08:25:48PM +0530, Shashank Sharma wrote:
> Current DRM layer functions don't parse aspect ratio information
> while converting a user mode->kernel mode or vice versa. This
> causes modeset to pick mode with wrong aspect ratio, eventually
> causing failures in HDMI compliance test cases, due to wrong VIC.
> 
> This patch adds aspect ratio information in DRM's mode conversion
> and mode comparision functions, to make sure kernel picks mode
> with right aspect ratio (as per the VIC).
> 
> V2: Addressed review comments from Sean:
> - Fix spellings/typo
> - No need to handle aspect ratio none
> - Add a break, for default case too
> 
> Signed-off-by: Shashank Sharma <shashank.sharma at intel.com>
> Signed-off-by: Lin, Jia <lin.a.jia at intel.com>
> Signed-off-by: Akashdeep Sharma <akashdeep.sharma at intel.com>

Reviewed-by: Jim Bride <jim.bride at linux.intel.com>

> 
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: Emil Velikov <emil.l.velikov at gmail.com>
> ---
>  drivers/gpu/drm/drm_modes.c | 31 +++++++++++++++++++++++++++++++
>  1 file changed, 31 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index fc5040a..9d8f00d 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -969,6 +969,7 @@ bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
>  	    mode1->vsync_end == mode2->vsync_end &&
>  	    mode1->vtotal == mode2->vtotal &&
>  	    mode1->vscan == mode2->vscan &&
> +	    mode1->picture_aspect_ratio == mode2->picture_aspect_ratio &&
>  	    (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
>  	     (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
>  		return true;
> @@ -1471,6 +1472,21 @@ void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
>  	out->vrefresh = in->vrefresh;
>  	out->flags = in->flags;
>  	out->type = in->type;
> +	out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
> +
> +	switch (in->picture_aspect_ratio) {
> +	case HDMI_PICTURE_ASPECT_4_3:
> +		out->flags |= DRM_MODE_FLAG_PIC_AR_4_3;
> +		break;
> +	case HDMI_PICTURE_ASPECT_16_9:
> +		out->flags |= DRM_MODE_FLAG_PIC_AR_16_9;
> +		break;
> +	case HDMI_PICTURE_ASPECT_RESERVED:
> +	default:
> +		out->flags |= DRM_MODE_FLAG_PIC_AR_NONE;
> +		break;
> +	}
> +
>  	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
>  	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
>  }
> @@ -1516,6 +1532,21 @@ int drm_mode_convert_umode(struct drm_display_mode *out,
>  	strncpy(out->name, in->name, DRM_DISPLAY_MODE_LEN);
>  	out->name[DRM_DISPLAY_MODE_LEN-1] = 0;
>  
> +	/* Clearing picture aspect ratio bits from out flags */
> +	out->flags &= ~DRM_MODE_FLAG_PIC_AR_MASK;
> +
> +	switch (in->flags & DRM_MODE_FLAG_PIC_AR_MASK) {
> +	case DRM_MODE_FLAG_PIC_AR_4_3:
> +		out->picture_aspect_ratio |= HDMI_PICTURE_ASPECT_4_3;
> +		break;
> +	case DRM_MODE_FLAG_PIC_AR_16_9:
> +		out->picture_aspect_ratio |= HDMI_PICTURE_ASPECT_16_9;
> +		break;
> +	default:
> +		out->picture_aspect_ratio = HDMI_PICTURE_ASPECT_NONE;
> +		break;
> +	}
> +
>  	out->status = drm_mode_validate_basic(out);
>  	if (out->status != MODE_OK)
>  		goto out;
> -- 
> 1.9.1
> 
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