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haswell: Allow pre-graphics delay

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Some slow monitors/TVs can't wake up quickly enough for coreboot,
so when the VBIOS is run it won't detect them. Hence, add an option
to wait for a while before running the VBIOS.

BUG=none
BRANCH=panther
TEST=Boot to dev mode on one of the systems that exposed the problem
     and see it go away.

Change-Id: Ib9524f1c7ee08bedf96a6468da8b4ccf712fe0e2
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: https://chromium-review.googlesource.com/183545
Reviewed-by: Mohammed Habibulla <moch@google.com>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
This commit is contained in:
Stefan Reinauer 2014-01-22 15:16:30 -08:00 • committed by chrome-internal-fetch
commit 3940197a4c
2 changed files with 10 additions and 0 deletions
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9
src/northbridge/intel/haswell/Kconfig
View file

@ -112,4 +112,13 @@ config CBFS_SIZE
This option allows to limit the size of the CBFS portion in the
firmware image.
config PRE_GRAPHICS_DELAY
int
default 0
help
On some systems, coreboot boots so fast that connected monitors
(mostly TVs) won't be able to wake up fast enough to talk to the
VBIOS. On those systems we need to wait for a bit before executing
the VBIOS.
endif

1
src/northbridge/intel/haswell/gma.c
View file

@ -465,6 +465,7 @@ static void gma_func0_init(struct device *dev)
#endif
if (! lightup_ok) {
printk(BIOS_SPEW, "FUI did not run; using VBIOS\n");
mdelay(CONFIG_PRE_GRAPHICS_DELAY);
pci_dev_init(dev);
}