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drm/edid: Decode 3-byte CVT codes from EDID 1.4 

Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
hifive-unleashed-5.1
Adam Jackson 2009-12-03 17:44:40 -05:00 committed by Dave Airlie
parent 2dbdc52c81
commit 9340d8cfea
2 changed files with 53 additions and 0 deletions
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48
drivers/gpu/drm/drm_edid.c
View File

@ -897,6 +897,51 @@ static int drm_gtf_modes_for_range(struct drm_connector *connector,
return modes;
}
static int drm_cvt_modes(struct drm_connector *connector,
struct detailed_timing *timing)
{
int i, j, modes = 0;
struct drm_display_mode *newmode;
struct drm_device *dev = connector->dev;
struct cvt_timing *cvt;
const int rates[] = { 60, 85, 75, 60, 50 };
for (i = 0; i < 4; i++) {
int width, height;
cvt = &(timing->data.other_data.data.cvt[i]);
height = (cvt->code[0] + ((cvt->code[1] & 0xf0) << 8) + 1) * 2;
switch (cvt->code[1] & 0xc0) {
case 0x00:
width = height * 4 / 3;
break;
case 0x40:
width = height * 16 / 9;
break;
case 0x80:
width = height * 16 / 10;
break;
case 0xc0:
width = height * 15 / 9;
break;
}
for (j = 1; j < 5; j++) {
if (cvt->code[2] & (1 << j)) {
newmode = drm_cvt_mode(dev, width, height,
rates[j], j == 0,
false, false);
if (newmode) {
drm_mode_probed_add(connector, newmode);
modes++;
}
}
}
}
return modes;
}
static int add_detailed_modes(struct drm_connector *connector,
struct detailed_timing *timing,
struct edid *edid, u32 quirks, int preferred)
@ -941,6 +986,9 @@ static int add_detailed_modes(struct drm_connector *connector,
}
}
break;
case EDID_DETAIL_CVT_3BYTE:
modes += drm_cvt_modes(connector, timing);
break;
default:
break;
}

5
include/drm/drm_edid.h
View File

@ -106,6 +106,10 @@ struct detailed_data_color_point {
u8 wpindex2[3];
} __attribute__((packed));
struct cvt_timing {
u8 code[3];
} __attribute__((packed));
struct detailed_non_pixel {
u8 pad1;
u8 type; /* ff=serial, fe=string, fd=monitor range, fc=monitor name
@ -117,6 +121,7 @@ struct detailed_non_pixel {
struct detailed_data_monitor_range range;
struct detailed_data_wpindex color;
struct std_timing timings[5];
struct cvt_timing cvt[4];
} data;
} __attribute__((packed));