diff options
| author | Mats Randgaard <matrandg@cisco.com> | 2013-12-05 07:33:08 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <m.chehab@samsung.com> | 2014-01-07 05:25:34 -0200 |
| commit | bafd5d79fbc764f9dd977737e3b25d480ade2d5a (patch) | |
| tree | 0323f554bb693f98bd7a18f8d405b87deb7ea891 /drivers/media/i2c/ad9389b.c | |
| parent | e63fa180e81576d144606a1d4aa6976edde70cfd (diff) | |
[media] ad9389b: verify EDID header
Ignore EDIDs where the header is wrong.
Signed-off-by: Mats Randgaard <matrandg@cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/i2c/ad9389b.c')
| -rw-r--r-- | drivers/media/i2c/ad9389b.c | 26 |
1 files changed, 23 insertions, 3 deletions
diff --git a/drivers/media/i2c/ad9389b.c b/drivers/media/i2c/ad9389b.c index b06a7e54ee0d..e7f7171f9303 100644 --- a/drivers/media/i2c/ad9389b.c +++ b/drivers/media/i2c/ad9389b.c @@ -978,7 +978,7 @@ static bool edid_block_verify_crc(u8 *edid_block) return sum == 0; } -static bool edid_segment_verify_crc(struct v4l2_subdev *sd, u32 segment) +static bool edid_verify_crc(struct v4l2_subdev *sd, u32 segment) { struct ad9389b_state *state = get_ad9389b_state(sd); u32 blocks = state->edid.blocks; @@ -992,6 +992,25 @@ static bool edid_segment_verify_crc(struct v4l2_subdev *sd, u32 segment) return false; } +static bool edid_verify_header(struct v4l2_subdev *sd, u32 segment) +{ + static const u8 hdmi_header[] = { + 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00 + }; + struct ad9389b_state *state = get_ad9389b_state(sd); + u8 *data = state->edid.data; + int i; + + if (segment) + return true; + + for (i = 0; i < ARRAY_SIZE(hdmi_header); i++) + if (data[i] != hdmi_header[i]) + return false; + + return true; +} + static bool ad9389b_check_edid_status(struct v4l2_subdev *sd) { struct ad9389b_state *state = get_ad9389b_state(sd); @@ -1019,9 +1038,10 @@ static bool ad9389b_check_edid_status(struct v4l2_subdev *sd) v4l2_dbg(1, debug, sd, "%s: %d blocks in total\n", __func__, state->edid.blocks); } - if (!edid_segment_verify_crc(sd, segment)) { + if (!edid_verify_crc(sd, segment) || + !edid_verify_header(sd, segment)) { /* edid crc error, force reread of edid segment */ - v4l2_err(sd, "%s: edid crc error\n", __func__); + v4l2_err(sd, "%s: edid crc or header error\n", __func__); state->have_monitor = false; ad9389b_s_power(sd, false); ad9389b_s_power(sd, true); |