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video: Check EDID for HDMI connection

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Check EDID Vendor Specific Data Block bytes to see if the connection
is HDMI and set FB_MISC_HDMI.

Signed-off-by: David Ung <davidu@nvidia.com>
Signed-off-by: Christopher Freeman <cfreeman@nvidia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
David Ung 2014-03-26 15:35:37 -07:00 committed by Tomi Valkeinen
parent f474f0e1fb
commit e6853aafd4
2 changed files with 9 additions and 1 deletions
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9
drivers/video/fbdev/core/fbmon.c
View File

@ -1012,13 +1012,20 @@ void fb_edid_add_monspecs(unsigned char *edid, struct fb_monspecs *specs)
while (pos < edid[2]) {
u8 len = edid[pos] & 0x1f, type = (edid[pos] >> 5) & 7;
pr_debug("Data block %u of %u bytes\n", type, len);
if (type == 2)
if (type == 2) {
for (i = pos; i < pos + len; i++) {
u8 idx = edid[pos + i] & 0x7f;
svd[svd_n++] = idx;
pr_debug("N%sative mode #%d\n",
edid[pos + i] & 0x80 ? "" : "on-n", idx);
}
} else if (type == 3 && len >= 3) {
/* Check Vendor Specific Data Block. For HDMI,
it is always 00-0C-03 for HDMI Licensing, LLC. */
if (edid[pos + 1] == 3 && edid[pos + 2] == 0xc &&
edid[pos + 3] == 0)
specs->misc |= FB_MISC_HDMI;
}
pos += len + 1;
}

1
include/linux/fb.h
View File

@ -47,6 +47,7 @@ struct device_node;
#define FB_MISC_PRIM_COLOR 1
#define FB_MISC_1ST_DETAIL 2 /* First Detailed Timing is preferred */
#define FB_MISC_HDMI 4
struct fb_chroma {
__u32 redx; /* in fraction of 1024 */
__u32 greenx;