From e205410728d8c327a2264ff760eb0698eac030e8 Mon Sep 17 00:00:00 2001 From: David Hendricks Date: Fri, 7 Aug 2015 18:41:37 -0700 Subject: edid: add function to manually specify mode This patch will let you to choose a favourite mode to display, while not just taking the edid detail timing. But not all modes are able to set, only modes that are in established or standard timing, and we only support a few common common resolutions for now. BUG=chrome-os-partner:42946 BRANCH=firmware-veyron TEST=tested dev mode on Mickey at 640x480@60Hz Change-Id: I8a9dedfe08057d42d85b8ca129935a258cb26762 Signed-off-by: Patrick Georgi Original-Commit-Id: 090583f90ff720d88e5cfe69fcb2d541c716f0e6 Original-Change-Id: Iaa8c9a6fad106ee792f7cd1a0ac77e3dcbadf481 Original-Signed-off-by: Yakir Yang Original-Signed-off-by: David Hendricks Original-Reviewed-on: https://chromium-review.googlesource.com/289671 Original-Reviewed-by: Julius Werner Reviewed-on: http://review.coreboot.org/11390 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/lib/edid.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 60 insertions(+), 1 deletion(-) (limited to 'src/lib') 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 @@ -976,6 +976,52 @@ static void dump_breakdown(unsigned char *edid) printk(BIOS_SPEW, "\n"); } +/* + * 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 @@ -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 */ -- cgit v1.2.3