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-rw-r--r--src/lib/edid.c61
1 files changed, 60 insertions, 1 deletions
diff --git a/src/lib/edid.c b/src/lib/edid.c
index ed3565cb57..be3d90602a 100644
--- a/src/lib/edid.c
+++ b/src/lib/edid.c
@@ -977,6 +977,52 @@ static void dump_breakdown(unsigned char *edid)
}
/*
+ * Lookup table of some well-known modes that can be useful in case the
+ * auto-detected mode is unsuitable.
+ * ha = hdisplay; va = vdisplay;
+ * hbl = htotal - hdisplay; vbl = vtotal - vdisplay;
+ * hso = hsync_start - hdsiplay; vso = vsync_start - vdisplay;
+ * hspw = hsync_end - hsync_start; vspw = vsync_end - vsync_start;
+ */
+static struct edid_mode known_modes[NUM_KNOWN_MODES] = {
+ [EDID_MODE_640x480_60Hz] = {
+ .name = "640x480@60Hz", .pixel_clock = 25175, .refresh = 60,
+ .ha = 640, .hbl = 160, .hso = 16, .hborder = 96,
+ .va = 480, .vbl = 45, .vso = 10, .vspw = 2,
+ .phsync = '-', .pvsync = '-' },
+ [EDID_MODE_720x480_60Hz] = {
+ .name = "720x480@60Hz", .pixel_clock = 27000, .refresh = 60,
+ .ha = 720, .hbl = 78, .hso = 16, .hborder = 62,
+ .va = 480, .vbl = 45, .vso = 9, .vspw = 6,
+ .phsync = '-', .pvsync = '-' },
+ [EDID_MODE_1280x720_60Hz] = {
+ .name = "1280x720@60Hz", .pixel_clock = 74250, .refresh = 60,
+ .ha = 1280, .hbl = 370, .hso = 110, .hborder = 40,
+ .va = 720, .vbl = 30, .vso = 5, .vspw = 20,
+ .phsync = '+', .pvsync = '+' },
+ [EDID_MODE_1920x1080_60Hz] = {
+ .name = "1920x1080@60Hz", .pixel_clock = 148500, .refresh = 60,
+ .ha = 1920, .hbl = 280, .hso = 88, .hborder = 44,
+ .va = 1080, .vbl = 45, .vso = 4, .vspw = 5,
+ .phsync = '+', .pvsync = '+' },
+};
+
+int set_display_mode(struct edid *edid, enum edid_modes mode)
+{
+ if (mode == EDID_MODE_AUTO)
+ return 0;
+
+ if (edid->mode_is_supported[mode]) {
+ printk(BIOS_DEBUG, "Forcing mode %s\n", known_modes[mode].name);
+ edid->mode = known_modes[mode];
+ return 0;
+ }
+
+ printk(BIOS_ERR, "Requested display mode not supported.\n");
+ return -1;
+}
+
+/*
* Given a raw edid bloc, decode it into a form
* that other parts of coreboot can use -- mainly
* graphics bringup functions. The raw block is
@@ -986,7 +1032,7 @@ static void dump_breakdown(unsigned char *edid)
*/
int decode_edid(unsigned char *edid, int size, struct edid *out)
{
- int analog, i;
+ int analog, i, j;
struct edid_context c = {
.has_valid_cvt = 1,
.has_valid_dummy_block = 1,
@@ -1210,6 +1256,14 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
printk(BIOS_SPEW, " %dx%d@%dHz\n", established_timings[i].x,
established_timings[i].y, established_timings[i].refresh);
}
+
+ for (j = 0; j < NUM_KNOWN_MODES; j++) {
+ if (known_modes[j].ha == established_timings[i].x &&
+ known_modes[j].va == established_timings[i].y &&
+ known_modes[j].refresh == established_timings[i].refresh)
+ out->mode_is_supported[j] = 1;
+ }
+
}
printk(BIOS_SPEW, "Standard timings supported:\n");
@@ -1245,6 +1299,11 @@ int decode_edid(unsigned char *edid, int size, struct edid *out)
refresh = 60 + (b2 & 0x3f);
printk(BIOS_SPEW, " %dx%d@%dHz\n", x, y, refresh);
+ for (j = 0; j < NUM_KNOWN_MODES; j++) {
+ if (known_modes[j].ha == x && known_modes[j].va == y &&
+ known_modes[j].refresh == refresh)
+ out->mode_is_supported[j] = 1;
+ }
}
/* detailed timings */