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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef EDID_H
#define EDID_H
#include <stdint.h>
#include <framebuffer_info.h>
#include "commonlib/coreboot_tables.h"
enum edid_modes {
EDID_MODE_640x480_60Hz,
EDID_MODE_720x480_60Hz,
EDID_MODE_1280x720_60Hz,
EDID_MODE_1920x1080_60Hz,
NUM_KNOWN_MODES,
EDID_MODE_AUTO
};
struct edid_mode {
const char *name;
unsigned int pixel_clock;
int lvds_dual_channel;
unsigned int refresh;
unsigned int ha;
unsigned int hbl;
unsigned int hso;
unsigned int hspw;
unsigned int hborder;
unsigned int va;
unsigned int vbl;
unsigned int vso;
unsigned int vspw;
unsigned int vborder;
unsigned char phsync;
unsigned char pvsync;
unsigned int x_mm;
unsigned int y_mm;
};
/* structure for communicating EDID information from a raw EDID block to
* higher level functions.
* The size of the data types is not critical, so we leave them as
* unsigned int. We can move more into this struct as needed.
*/
#define EDID_ASCII_STRING_LENGTH 13
struct edid {
/* These next three things used to all be called bpp.
* Merriment ensued. The identifier
* 'bpp' is herewith banished from our
* Kingdom.
*/
/* How many bits in the framebuffer per pixel.
* Under all reasonable circumstances, it's 32.
*/
unsigned int framebuffer_bits_per_pixel;
/* On the panel, how many bits per color?
* In almost all cases, it's 6 or 8.
* The standard allows for much more!
*/
unsigned int panel_bits_per_color;
/* On the panel, how many bits per pixel.
* On Planet Earth, there are three colors
* per pixel, but this is convenient to have here
* instead of having 3*panel_bits_per_color
* all over the place.
*/
unsigned int panel_bits_per_pixel;
/* used to compute timing for graphics chips. */
struct edid_mode mode;
u8 mode_is_supported[NUM_KNOWN_MODES];
unsigned int link_clock;
/* 3 variables needed for coreboot framebuffer.
* In most cases, they are the same as the ha
* and va variables, but not always, as in the
* case of a 1366 wide display.
*/
u32 x_resolution;
u32 y_resolution;
u32 bytes_per_line;
int hdmi_monitor_detected;
char ascii_string[EDID_ASCII_STRING_LENGTH + 1];
char manufacturer_name[3 + 1];
};
enum edid_status {
EDID_CONFORMANT,
EDID_NOT_CONFORMANT,
EDID_ABSENT,
};
/* Defined in src/lib/edid.c */
int decode_edid(unsigned char *edid, int size, struct edid *out);
void edid_set_framebuffer_bits_per_pixel(struct edid *edid, int fb_bpp,
int row_byte_alignment);
int set_display_mode(struct edid *edid, enum edid_modes mode);
#endif /* EDID_H */
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