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authorEvgeny Zinoviev <me@ch1p.com>2018-08-30 02:18:48 +0300
committerPatrick Georgi <pgeorgi@google.com>2018-09-05 10:04:20 +0000
commit384e9aed8c477922c960e2cbd429bd3a15b371de (patch)
treefd46db5b106df1a26c6e6fd5e93d1e1569924733 /src/mainboard/lenovo/t420
parentce1af8b0bf8569ad2d0ebc7bc7b0babe1579c7f2 (diff)
downloadcoreboot-384e9aed8c477922c960e2cbd429bd3a15b371de.tar.xz
mb/lenovo: Support dual graphics for xx20/xx30 ThinkPads
Add CMOS option that allows to use both integrated and discrete GPU. Tested on ThinkPad W530. Change-Id: I8842fef0fa1235eb91abf6b7e655ed4d8598adc7 Signed-off-by: Evgeny Zinoviev <me@ch1p.com> Reviewed-on: https://review.coreboot.org/28393 Reviewed-by: Patrick Rudolph <siro@das-labor.org> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/mainboard/lenovo/t420')
-rw-r--r--src/mainboard/lenovo/t420/cmos.layout1
-rw-r--r--src/mainboard/lenovo/t420/romstage.c3
2 files changed, 4 insertions, 0 deletions
diff --git a/src/mainboard/lenovo/t420/cmos.layout b/src/mainboard/lenovo/t420/cmos.layout
index 5a9e570c3f..f55c2037d5 100644
--- a/src/mainboard/lenovo/t420/cmos.layout
+++ b/src/mainboard/lenovo/t420/cmos.layout
@@ -129,6 +129,7 @@ enumerations
11 6 224M
12 0 Integrated Only
12 1 Discrete Only
+12 2 Dual Graphics
13 0 Disable
13 1 AC and battery
13 2 AC only
diff --git a/src/mainboard/lenovo/t420/romstage.c b/src/mainboard/lenovo/t420/romstage.c
index 36e83a3c72..bef256200e 100644
--- a/src/mainboard/lenovo/t420/romstage.c
+++ b/src/mainboard/lenovo/t420/romstage.c
@@ -30,6 +30,9 @@ static void hybrid_graphics_init(void)
early_hybrid_graphics(&igd, &peg);
+ if (peg && igd)
+ return;
+
/* Hide disabled devices */
reg32 = pci_read_config32(PCI_DEV(0, 0, 0), DEVEN);
reg32 &= ~(DEVEN_PEG10 | DEVEN_IGD);