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[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>
This commit is contained in:
Mats Randgaard 2013-12-05 07:33:08 -03:00 committed by Mauro Carvalho Chehab
parent e63fa180e8
commit bafd5d79fb
1 changed files with 23 additions and 3 deletions
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26
drivers/media/i2c/ad9389b.c
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@ -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);