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edid: Add HDMI flag to timing info

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Some DVI monitors don't show anything in HDMI mode since audio stream
confuses them. To solve this situation, this commit adds HDMI flag in
timing data and sets it accordingly during edid parsing.

First existence of extension block is checked. If it exists and it is
CEA861 extension, then data blocks are checked for presence of HDMI
vendor specific data block. If it is present, HDMI flag is set.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Jernej Skrabec
2017-04-29 14:43:36 +02:00
committed by Anatolij Gustschin
parent dc8cae4df3
commit 43c6bdd020
3 changed files with 57 additions and 0 deletions
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14
include/edid.h
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@@ -19,6 +19,9 @@
#define EDID_SIZE 128
#define EDID_EXT_SIZE 256
/* OUI of HDMI vendor specific data block */
#define HDMI_IEEE_OUI 0x000c03
#define GET_BIT(_x, _pos) \
(((_x) >> (_pos)) & 1)
#define GET_BITS(_x, _pos_msb, _pos_lsb) \
@@ -234,6 +237,13 @@ struct edid1_info {
unsigned char checksum;
} __attribute__ ((__packed__));
enum edid_cea861_db_types {
EDID_CEA861_DB_AUDIO = 0x01,
EDID_CEA861_DB_VIDEO = 0x02,
EDID_CEA861_DB_VENDOR = 0x03,
EDID_CEA861_DB_SPEAKER = 0x04,
};
struct edid_cea861_info {
unsigned char extension_tag;
#define EDID_CEA861_EXTENSION_TAG 0x02
@@ -251,6 +261,10 @@ struct edid_cea861_info {
#define EDID_CEA861_DTD_COUNT(_x) \
GET_BITS(((_x).dtd_count), 3, 0)
unsigned char data[124];
#define EDID_CEA861_DB_TYPE(_x, offset) \
GET_BITS((_x).data[offset], 7, 5)
#define EDID_CEA861_DB_LEN(_x, offset) \
GET_BITS((_x).data[offset], 4, 0)
} __attribute__ ((__packed__));
/**