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| author | Vladimir Serbinenko <phcoder@gmail.com> | 2015-10-10 23:58:08 +0200 |
|---|---|---|
| committer | Vladimir Serbinenko <phcoder@gmail.com> | 2015-10-11 10:07:12 +0000 |
| commit | 551cff08d540ced6817cfe230750a311d573c209 (patch) | |
| tree | ed32fa211b291527ed275aa286faa2af49584f72 /src/lib | |
| parent | 68c70994e5c7c38c8fe3625477d3191d186b7e68 (diff) | |
| download | coreboot-551cff08d540ced6817cfe230750a311d573c209.tar.xz | |
Derive lvds_dual_channel from EDID timings.
Based on the info by Felix Held.
Change-Id: Iab84dd8a0e3c942da20a6e21db5510e4ad16cadd
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/11857
Tested-by: build bot (Jenkins)
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>
Diffstat (limited to 'src/lib')
| -rw-r--r-- | src/lib/edid.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/lib/edid.c b/src/lib/edid.c index 68cc38a278..d0056788a3 100644 --- a/src/lib/edid.c +++ b/src/lib/edid.c @@ -446,6 +446,21 @@ detailed_block(struct edid *out, unsigned char *x, int in_extension, if (! c->did_detailed_timing){ /* Edid contains pixel clock in terms of 10KHz */ out->mode.pixel_clock = (x[0] + (x[1] << 8)) * 10; + /* + LVDS supports following pixel clocks + 25000...112000 kHz: single channel + 80000...224000 kHz: dual channel + There is some overlap in theoretically supported + pixel clock between single-channel and dual-channel. + In practice with current panels all panels + <= 75200 kHz: single channel + >= 97750 kHz: dual channel + We have no samples between those values, so put a + threshold at 95000 kHz. If we get anything over + 95000 kHz with single channel, we can make this + more sofisticated but it's currently not needed. + */ + out->mode.lvds_dual_channel = (out->mode.pixel_clock >= 95000); extra_info.x_mm = (x[12] + ((x[14] & 0xF0) << 4)); extra_info.y_mm = (x[13] + ((x[14] & 0x0F) << 8)); out->mode.ha = (x[2] + ((x[4] & 0xF0) << 4)); |