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nb/intel/nehalem: Don't run graphic init on S3 resume 

The assumption is made that an ACPI aware an OS does not rely on
firmware to initialize the display.

TESTED on a Lenovo Thinkpad X201 with Linux 5.2, display still works
after S3, more than 200ms in time saved (dropped from 411ms to 182ms
in total in one test).

Change-Id: I36219e6d04db561d4f2ddb6e962166c598d5bc4f
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35773
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
This commit is contained in:
Arthur Heymans 2019-10-03 09:34:57 +02:00
parent 3b452e0a79
commit 38750f88fc
1 changed files with 2 additions and 1 deletions
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3
src/northbridge/intel/nehalem/gma.c
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@ -176,7 +176,8 @@ static void gma_func0_init(struct device *dev)
if (!gtt_res || !gtt_res->base)
return;
if (CONFIG(MAINBOARD_USE_LIBGFXINIT)) {
if (!acpi_is_wakeup_s3() &&
CONFIG(MAINBOARD_USE_LIBGFXINIT)) {
struct northbridge_intel_nehalem_config *conf = dev->chip_info;
int lightup_ok;
printk(BIOS_SPEW, "Initializing VGA without OPROM.");