On Thu, Nov 28, 2013 at 05:12:46PM +0000, Thomas Wood wrote:
> Signed-off-by: Thomas Wood <thomas.wood@xxxxxxxxx>
> ---
> drivers/gpu/drm/drm_edid.c | 67 +++++++++++++++++++++++++++-------------------
> 1 file changed, 39 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index 52e060e..1dd82cd 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -2557,25 +2557,40 @@ add_alternate_cea_modes(struct drm_connector *connector, struct edid *edid)
> return modes;
> }
>
> -static int
> -do_cea_modes(struct drm_connector *connector, const u8 *db, u8 len)
> +static struct drm_display_mode *
> +drm_display_mode_from_vic_index(struct drm_connector *connector,
> + const u8 *video_db, u8 video_len,
> + u8 video_index)
> {
> struct drm_device *dev = connector->dev;
> - const u8 *mode;
> + struct drm_display_mode *newmode;
> u8 cea_mode;
> - int modes = 0;
>
> - for (mode = db; mode < db + len; mode++) {
> - cea_mode = (*mode & 127) - 1; /* CEA modes are numbered 1..127 */
> - if (cea_mode < ARRAY_SIZE(edid_cea_modes)) {
> - struct drm_display_mode *newmode;
> - newmode = drm_mode_duplicate(dev,
> - &edid_cea_modes[cea_mode]);
> - if (newmode) {
> - newmode->vrefresh = 0;
> - drm_mode_probed_add(connector, newmode);
> - modes++;
> - }
> + if (video_db == NULL || video_index > video_len)
> + return NULL;
Hmm, this seems wrong. video_len is the length of the payload only,
so the check should be >=. But this bug is already present in
the current code in add_3d_struct_modes(). So maybe include another
patch to fix that up first.
The rest looks OK to me.
> +
> + /* CEA modes are numbered 1..127 */
> + cea_mode = (video_db[video_index] & 127) - 1;
> + if (cea_mode >= ARRAY_SIZE(edid_cea_modes))
> + return NULL;
> +
> + newmode = drm_mode_duplicate(dev, &edid_cea_modes[cea_mode]);
> + newmode->vrefresh = 0;
> +
> + return newmode;
> +}
> +
> +static int
> +do_cea_modes(struct drm_connector *connector, const u8 *db, u8 len)
> +{
> + int i, modes = 0;
> +
> + for (i = 0; i < len; i++) {
> + struct drm_display_mode *mode;
> + mode = drm_display_mode_from_vic_index(connector, db, len, i);
> + if (mode) {
> + drm_mode_probed_add(connector, mode);
> + modes++;
> }
> }
>
> @@ -2669,21 +2684,13 @@ static int add_hdmi_mode(struct drm_connector *connector, u8 vic)
> static int add_3d_struct_modes(struct drm_connector *connector, u16 structure,
> const u8 *video_db, u8 video_len, u8 video_index)
> {
> - struct drm_device *dev = connector->dev;
> struct drm_display_mode *newmode;
> int modes = 0;
> - u8 cea_mode;
> -
> - if (video_db == NULL || video_index > video_len)
> - return 0;
> -
> - /* CEA modes are numbered 1..127 */
> - cea_mode = (video_db[video_index] & 127) - 1;
> - if (cea_mode >= ARRAY_SIZE(edid_cea_modes))
> - return 0;
>
> if (structure & (1 << 0)) {
> - newmode = drm_mode_duplicate(dev, &edid_cea_modes[cea_mode]);
> + newmode = drm_display_mode_from_vic_index(connector, video_db,
> + video_len,
> + video_index);
> if (newmode) {
> newmode->flags |= DRM_MODE_FLAG_3D_FRAME_PACKING;
> drm_mode_probed_add(connector, newmode);
> @@ -2691,7 +2698,9 @@ static int add_3d_struct_modes(struct drm_connector *connector, u16 structure,
> }
> }
> if (structure & (1 << 6)) {
> - newmode = drm_mode_duplicate(dev, &edid_cea_modes[cea_mode]);
> + newmode = drm_display_mode_from_vic_index(connector, video_db,
> + video_len,
> + video_index);
> if (newmode) {
> newmode->flags |= DRM_MODE_FLAG_3D_TOP_AND_BOTTOM;
> drm_mode_probed_add(connector, newmode);
> @@ -2699,7 +2708,9 @@ static int add_3d_struct_modes(struct drm_connector *connector, u16 structure,
> }
> }
> if (structure & (1 << 8)) {
> - newmode = drm_mode_duplicate(dev, &edid_cea_modes[cea_mode]);
> + newmode = drm_display_mode_from_vic_index(connector, video_db,
> + video_len,
> + video_index);
> if (newmode) {
> newmode->flags |= DRM_MODE_FLAG_3D_SIDE_BY_SIDE_HALF;
> drm_mode_probed_add(connector, newmode);
> --
> 1.8.4.2
>
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> dri-devel@xxxxxxxxxxxxxxxxxxxxx
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--
Ville Syrjälä
Intel OTC
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