summaryrefslogtreecommitdiff
path: root/src/mainboard/lenovo/t420
diff options
context:
space:
mode:
authorPatrick Rudolph <siro@das-labor.org>2015-12-26 08:35:08 +0100
committerMartin Roth <martinroth@google.com>2016-06-01 23:22:01 +0200
commit5919ba42ed0ce5b1b13717514698444232c6036c (patch)
treee9c5abf35fb95f7e483ee73538108235965b5d5d /src/mainboard/lenovo/t420
parent14d1a93e444b91311eeed2a25953bf6c0779cdcb (diff)
downloadcoreboot-5919ba42ed0ce5b1b13717514698444232c6036c.tar.xz
drivers/lenovo: Add hybrid graphics driver
Add a universal hybrid graphics driver compatible with all supported lenovo devices. Hybrid graphics allows to connect the display panel to either of one GPUs. As there are only two GPUs one GPIO needs to be toggled. In case the discrete GPU is activated the panel is routed to it. On deactivation the panel is routed to the integrated GPU. On lenovo laptops the dGPU is always connected to PEG10 and it is save to disable the PEG slot on dGPU deactivation. Use common gpio.c for southbridge I82801IX. Tested on Lenovo T520 using Nvidia NVS 5200m. Removed Lenovo T430s from the list of supported devices, as the T430s only supports "muxless Optimus". Depends on change id: Iccc6d254bafb927b6470704cec7c9dd7528e2c68 Ibb54c03fd83a529d1ceccfb2c33190e7d42224d8 I8bd981c4696c174152cf41caefa6c083650d283a Iaf0c2f941f2625a5547f9cba79da1b173da6f295 I994114734fa931926c34ed04305cddfbeb429b62 Change-Id: I9b80b31a7749bdf893ed3b772a6505c9f29a56d1 Signed-off-by: Patrick Rudolph <siro@das-labor.org> Reviewed-on: https://review.coreboot.org/12896 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com> Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@googlemail.com>
Diffstat (limited to 'src/mainboard/lenovo/t420')
-rw-r--r--src/mainboard/lenovo/t420/cmos.default1
-rw-r--r--src/mainboard/lenovo/t420/cmos.layout5
2 files changed, 5 insertions, 1 deletions
diff --git a/src/mainboard/lenovo/t420/cmos.default b/src/mainboard/lenovo/t420/cmos.default
index 1b8e212894..3a82c979dc 100644
--- a/src/mainboard/lenovo/t420/cmos.default
+++ b/src/mainboard/lenovo/t420/cmos.default
@@ -14,3 +14,4 @@ fn_ctrl_swap=Disable
sticky_fn=Disable
trackpoint=Enable
hyper_threading=Enable
+hybrid_graphics_mode=Integrated Only \ No newline at end of file
diff --git a/src/mainboard/lenovo/t420/cmos.layout b/src/mainboard/lenovo/t420/cmos.layout
index bf0f195425..58a4abeaf6 100644
--- a/src/mainboard/lenovo/t420/cmos.layout
+++ b/src/mainboard/lenovo/t420/cmos.layout
@@ -77,7 +77,8 @@ entries
# coreboot config options: northbridge
432 3 e 11 gfx_uma_size
-#435 5 r 0 unused
+435 2 e 12 hybrid_graphics_mode
+#437 3 r 0 unused
440 8 h 0 volume
@@ -135,6 +136,8 @@ enumerations
11 4 160M
11 5 192M
11 6 224M
+12 0 Integrated Only
+12 1 Discrete Only
# -----------------------------------------------------------------
checksums