Re: [PATCH 3/3] drm/edid: parse the list of additional 3D modes

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

On Fri, Nov 29, 2013 at 03:33:28PM +0000, Thomas Wood wrote:
> Parse 2D_VIC_order_X and 3D_Structure_X from the list at the end of the
> HDMI Vendor Specific Data Block.
> 
> v2: Use an offset value depending on 3D_Multi_present and add
>     detail_present. (Ville Syrjälä)
> 
> Signed-off-by: Thomas Wood <thomas.wood@intel.com>
> ---
>  drivers/gpu/drm/drm_edid.c | 64 ++++++++++++++++++++++++++++++++++++++++++----
>  1 file changed, 59 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index f1d6e1e..9426563 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -2734,7 +2734,7 @@ static int
>  do_hdmi_vsdb_modes(struct drm_connector *connector, const u8 *db, u8 len,
>  		   const u8 *video_db, u8 video_len)
>  {
> -	int modes = 0, offset = 0, i, multi_present = 0;
> +	int modes = 0, offset = 0, i, multi_present = 0, multi_len;
>  	u8 vic_len, hdmi_3d_len = 0;
>  	u16 mask;
>  	u16 structure_all;
> @@ -2783,12 +2783,15 @@ do_hdmi_vsdb_modes(struct drm_connector *connector, const u8 *db, u8 len,
>  	if (!(multi_present == 1 || multi_present == 2))
>  		goto out;

We should actually skip the 3D_Structure_ALL/MASK stuff in
this case, but we should still go on and parse the 2D_VIC_order
stuff. So this check should be removed.

>  
> -	if ((multi_present == 1 && len < (9 + offset)) ||
> -	    (multi_present == 2 && len < (11 + offset)))
> +	if (multi_present == 1)
> +		multi_len = 2;
> +	else

and this should then be 'else if (multi_present == 2)' and
initialize multi_len to 0 in the beginning.

> +		multi_len = 4;
> +
> +	if (len < (offset + hdmi_3d_len))

At this point db[8 + offset] we be the first 3d byte, so
I think this should actually be something like:

if (len < (8 + offset + hdmi_3d_len - 1))

>  		goto out;
>  
> -	if ((multi_present == 1 && hdmi_3d_len < 2) ||
> -	    (multi_present == 2 && hdmi_3d_len < 4))
> +	if (hdmi_3d_len < multi_len)
>  		goto out;
>  
>  	/* 3D_Structure_ALL */
> @@ -2808,6 +2811,57 @@ do_hdmi_vsdb_modes(struct drm_connector *connector, const u8 *db, u8 len,
>  						     video_len, i);
>  	}
>  
> +	if (hdmi_3d_len <= multi_len)
> +		goto out;

Already checked, except the == case, but the loop will check
that for us, so this check can be dropped.

> +
> +	offset += multi_len;
> +
> +	for (i = 0; i < (hdmi_3d_len - multi_len); i++) {
> +		int vic_index;
> +		struct drm_display_mode *newmode = NULL;
> +		unsigned int newflag = 0;
> +		bool detail_present;
> +
> +		detail_present = ((db[8 + offset + i] & 0x0f) > 7);
> +
> +		if (detail_present && (i + 1 == hdmi_3d_len - multi_len))
> +			break;
> +
> +		/* 2D_VIC_order_X */
> +		vic_index = db[8 + offset + i] >> 4;
> +
> +		/* 3D_Structure_X */
> +		switch (db[8 + offset + i] & 0x0f) {
> +		case 0:
> +			newflag = DRM_MODE_FLAG_3D_FRAME_PACKING;
> +			break;
> +		case 6:
> +			newflag = DRM_MODE_FLAG_3D_TOP_AND_BOTTOM;
> +			break;
> +		case 8:
> +			/* 3D_Detail_X */
> +			if ((db[9 + offset + i] >> 4) == 1)
> +				newflag = DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF;
> +			break;
> +		}
> +
> +		if (newflag != 0) {
> +			newmode = drm_display_mode_from_vic_index(connector,
> +								  video_db,
> +								  video_len,
> +								  vic_index);
> +
> +			if (newmode) {
> +				newmode->flags |= newflag;
> +				drm_mode_probed_add(connector, newmode);
> +				modes++;
> +			}
> +		}
> +
> +		if (detail_present)
> +			i++;
> +	}
> +
>  out:
>  	return modes;
>  }
> -- 
> 1.8.4.2
> 
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-- 
Ville Syrjälä
Intel OTC