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Allow tweaking edid parameters #30

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Allow tweaking edid parameters #30

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3947db2
Allow tweaking edid parameters
ahmubashshir Dec 15, 2023
cd32cd3
Allow replacing Descriptors with dummies
ahmubashshir Dec 18, 2023
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146 changes: 115 additions & 31 deletions edid.S
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Original file line number Diff line number Diff line change
Expand Up @@ -20,13 +20,94 @@


/* Manufacturer */
#define MFG_LNX1 'L'
#define MFG_LNX2 'N'
#define MFG_LNX3 'X'
#ifndef MFG1
#define MFG1 'L'
#endif
#ifndef MFG2
#define MFG2 'N'
#endif
#ifndef MFG3
#define MFG3 'X'
#endif

#ifndef SERIAL
#define SERIAL 0
#endif

#ifndef YEAR
#define YEAR 2012
#endif

#ifndef WEEK
#define WEEK 5
#endif

#ifndef PROD
#define PROD 0
#endif

#ifndef DSP
#define DSP 0xea
#endif

#ifndef VIDMOD
#define VIDMOD 0x6d
#endif

#ifndef RED_GREEN
#define RED_GREEN 0x5e
#endif

#ifndef BLU_WHITE
#define BLU_WHITE 0xc0
#endif

#ifndef RED_XY
#define RED_XY 0xa4,0x59
#endif

#ifndef GRN_XY
#define GRN_XY 0x4a,0x98
#endif

#ifndef BLU_XY
#define BLU_XY 0x25,0x20
#endif

#ifndef WHT_XY
#define WHT_XY 0x50,0x54
#endif

#ifndef DSC2_TYPE
#define DSC2_TYPE 0xff
#define DSC2_DATA .ascii "Linux #0"
#elif ! defined(DSC2_DATA)
#error "DSC2_DATA" not defined
#endif

#ifndef DSC3_TYPE
#define DSC3_TYPE 0xff
#define DSC3_DATA \
.byte VFREQ-1; /* Minimum vertical field rate (1-255 Hz) */ \
.byte VFREQ+1; /* Maximum vertical field rate (1-255 Hz) */ \
.byte (CLOCK/(XPIX+XBLANK))-1; \
/* Minimum horizontal line rate (1-255 kHz) */ \
.byte (CLOCK/(XPIX+XBLANK))+1; \
/* Maximum horizontal line rate (1-255 kHz) */ \
.byte (CLOCK/10000)+1; \
/* Maximum pixel clock rate, rounded up \
to 10 MHz multiple (10-2550 MHz) */ \
.byte 0; /* No extended timing information type */
#elif ! defined(DSC3_DATA)
#error "DSC3_DATA" not defined
#endif

#ifndef DSC4_TYPE
#define DSC4_TYPE 0xfc
#define DSC4_DATA .ascii TIMING_NAME
#elif ! defined(DSC4_DATA)
#error "DSC4_DATA" not defined
#endif
/* EDID 1.3 standard definitions */
#define XY_RATIO_16_10 0b00
#define XY_RATIO_4_3 0b01
Expand Down Expand Up @@ -59,9 +140,9 @@
/* Fixed header pattern */
header: .byte 0x00,0xff,0xff,0xff,0xff,0xff,0xff,0x00

mfg_id: .hword swap16(mfgname2id(MFG_LNX1, MFG_LNX2, MFG_LNX3))
mfg_id: .hword swap16(mfgname2id(MFG1, MFG2, MFG3))

prod_code: .hword 0
prod_code: .hword PROD

/* Serial number. 32 bits, little endian. */
serial_number: .long SERIAL
Expand Down Expand Up @@ -90,7 +171,7 @@ revision: .byte REVISION /* EDID revision, usually 3 (for 1.3) */
Bit 1 Sync on green supported
Bit 0 VSync pulse must be serrated when somposite or
sync-on-green is used. */
video_parms: .byte 0x6d
video_parms: .byte VIDMOD

/* Maximum horizontal image size, in centimetres
(max 292 cm/115 in at 16:9 aspect ratio) */
Expand All @@ -112,34 +193,31 @@ gamma: .byte 120
sRGB standard values.
Bit 1 Preferred timing mode specified in descriptor block 1.
Bit 0 GTF supported with default parameter values. */
dsp_features: .byte 0xea
dsp_features: .byte DSP

/* Chromaticity coordinates. */
/* Red and green least-significant bits
Bits 7-6 Red x value least-significant 2 bits
Bits 5-4 Red y value least-significant 2 bits
Bits 3-2 Green x value lst-significant 2 bits
Bits 1-0 Green y value least-significant 2 bits */
red_green_lsb: .byte 0x5e
red_green_lsb: .byte RED_GREEN

/* Blue and white least-significant 2 bits */
blue_white_lsb: .byte 0xc0
blue_white_lsb: .byte BLU_WHITE

/* Red x value most significant 8 bits.
0-255 encodes 0-0.996 (255/256); 0-0.999 (1023/1024) with lsbits */
red_x_msb: .byte 0xa4

/* Red y value most significant 8 bits */
red_y_msb: .byte 0x59
red_x_y_msb: .byte RED_XY

/* Green x and y value most significant 8 bits */
green_x_y_msb: .byte 0x4a,0x98
green_x_y_msb: .byte GRN_XY

/* Blue x and y value most significant 8 bits */
blue_x_y_msb: .byte 0x25,0x20
blue_x_y_msb: .byte BLU_XY

/* Default white point x and y value most significant 8 bits */
white_x_y_msb: .byte 0x50,0x54
white_x_y_msb: .byte WHT_XY

/* Established timings */
/* Bit 7 720x400 @ 70 Hz
Expand All @@ -166,6 +244,10 @@ estbl_timing2: .byte ESTABLISHED_TIMING2_BITS
Bits 6-0 Other manufacturer-specific display mod */
estbl_timing3: .byte ESTABLISHED_TIMING3_BITS

#ifdef NO_STI
/* Standard timing: none */
.fill 8,2,0x0101 /* Unused */
#else
/* Standard timing */
/* X resolution, less 31, divided by 8 (256-2288 pixels) */
std_xres: .byte (XPIX/8)-31
Expand All @@ -174,6 +256,7 @@ std_xres: .byte (XPIX/8)-31
Bits 5-0 Vertical frequency, less 60 (60-123 Hz) */
std_vres: .byte (XY_RATIO<<6)+VFREQ-60
.fill 7,2,0x0101 /* Unused */
#endif

descriptor1:
/* Pixel clock in 10 kHz units. (0.-655.35 MHz, little-endian) */
Expand Down Expand Up @@ -238,34 +321,35 @@ y_border: .byte 0
Digital: HSync polarity (1=positive)
Bit 0 2-way line-interleaved stereo, if bits 4-3 are not 00. */
features: .byte 0x18+(VSYNC_POL<<2)+(HSYNC_POL<<1)

#ifndef DSC2_DISABLE
descriptor2: .byte 0,0 /* Not a detailed timing descriptor */
.byte 0 /* Must be zero */
.byte 0xff /* Descriptor is monitor serial number (text) */
.byte DSC2_TYPE /* Descriptor is monitor serial number (text) */
.byte 0 /* Must be zero */
start1: .ascii "Linux #0"
start1: DSC2_DATA
end1: .byte 0x0a /* End marker */
.fill 12-(end1-start1), 1, 0x20 /* Padded spaces */
#else
.byte 0
.byte 0
.byte 0
.byte 0x10
.fill 12,1,0x01
.byte 0x0a
.byte 0x20
#endif
descriptor3: .byte 0,0 /* Not a detailed timing descriptor */
.byte 0 /* Must be zero */
.byte 0xfd /* Descriptor is monitor range limits */
.byte DSC3_TYPE /* Descriptor is monitor range limits */
.byte 0 /* Must be zero */
start2: .byte VFREQ-1 /* Minimum vertical field rate (1-255 Hz) */
.byte VFREQ+1 /* Maximum vertical field rate (1-255 Hz) */
.byte (CLOCK/(XPIX+XBLANK))-1 /* Minimum horizontal line rate
(1-255 kHz) */
.byte (CLOCK/(XPIX+XBLANK))+1 /* Maximum horizontal line rate
(1-255 kHz) */
.byte (CLOCK/10000)+1 /* Maximum pixel clock rate, rounded up
to 10 MHz multiple (10-2550 MHz) */
.byte 0 /* No extended timing information type */
start2: DSC3_DATA
end2: .byte 0x0a /* End marker */
.fill 12-(end2-start2), 1, 0x20 /* Padded spaces */
descriptor4: .byte 0,0 /* Not a detailed timing descriptor */
.byte 0 /* Must be zero */
.byte 0xfc /* Descriptor is text */
.byte DSC4_TYPE /* Descriptor is text */
.byte 0 /* Must be zero */
start3: .ascii TIMING_NAME
start3: DSC4_DATA
end3: .byte 0x0a /* End marker */
.fill 12-(end3-start3), 1, 0x20 /* Padded spaces */
extensions: .byte 0 /* Number of extensions to follow */
Expand Down