| commit | 3ab6b08173b61c3793b7c86da54cac71f41a6322 | [log] [tgz] |
|---|---|---|
| author | Jeremy Compostella <[email protected]> | Wed Jan 11 21:05:42 2023 |
| committer | Chromeos LUCI <[email protected]> | Tue Feb 21 02:33:03 2023 |
| tree | cf90900b3ad347ab95c2146c1740a7db9cebb33b | |
| parent | 31042e8cb3dd2e1fbc56cd1e07b41c00c37e33c6 [diff] |
common: Turn off VGA when not in use anymore When VGA mode is up on Alder Lake or Raptor Lake devices, `Update_Outputs' does successfully turn off graphics but it also leaves some undesirable configuration which can confuse following graphics drivers such as the PEIM graphics driver. Experimentally, we have identified that `libgfxinit' should turn off VGA when it disables the ouput which was using this mode. BUG=b:264526798 BRANCH=firmware-brya-14505.B TEST=Developer screen shows up on the recovery flow on skolas (cherry picked from commit fe80fbb74de59781da2435bc7a9602eb0ce82bbe) Original-Change-Id: Id39c308a4d0408b996834439186645b33e692d02 Original-Signed-off-by: Jeremy Compostella <[email protected]> Original-Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/72123 Original-Reviewed-by: Tarun Tuli <[email protected]> Original-Reviewed-by: Nick Vaccaro <[email protected]> Original-Tested-by: Stefan Reinauer <[email protected]> GitOrigin-RevId: fe80fbb74de59781da2435bc7a9602eb0ce82bbe Change-Id: Ic5a021b6b17f90cd8a87cf10e127b83e61c03ac2 Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/coreboot/libgfxinit/+/4220199 Tested-by: CopyBot Service Account <[email protected]> Reviewed-by: Kangheui Won <[email protected]> Commit-Queue: Kangheui Won <[email protected]>
libgfxinit is a graphics initialization (aka modesetting) library for embedded environments. It currently supports only Intel hardware, more specifically the Intel Core processor line.
It can query and set up most kinds of displays based on their EDID information. You can, however, also specify particular mode lines.
libgfxinit is written in SPARK, an Ada subset with formal verification aspects. Absence of runtime errors can be proved automatically with SPARK GPL 2016.
For compilation, the GNAT Ada compiler is required. Usual package names in Linux distributions are gcc-ada and gnat.
You'll need libhwbase and libgfxinit. Best is to clone the repositories into a common parent directory (this way libgfxinit will know where to find libhwbase).
$ mkdir gfxfun && cd gfxfun $ git clone https://review.coreboot.org/p/libhwbase.git $ git clone https://review.coreboot.org/p/libgfxinit.git
Both libraries are currently configured by hand-written config files. You can either write your own .config, link one of the shipped files in configs/, e.g.:
$ ln -s configs/linux libhwbase/.config
or overwrite the config filename by specifying cnf=<configfile> on the make command line.
By default most debug messages won't be compiled into the binary. To include them into the build, set DEBUG=1 on the command line or in your .config.
Let‘s install libhwbase. We’ll need configs/linux to build regular Linux executables:
$ cd libhwbase $ make DEBUG=1 cnf=configs/linux install
By default this installs into a new subdirectory dest. You can however overwrite this decision by specifying DESTDIR=.
gfx_testlibgfxinit is configured and installed in the same manner as described above. You will have to select a configuration matching your hardware.
The makefile knows an additional target gfx_test to build a small Linux test application:
$ cd ../libgfxinit $ make DEBUG=1 cnf=configs/sandybridge gfx_test
The resulting binary is build/gfx_test.
gfx_test sets up its own framebuffer in the stolen memory. It backs any current framebuffer mapping and contents up first and restores it before exiting. This works somehow even while the i915 driver is running. A wrapper script gfxtest/gfx_test.sh is provided to help with the setup. It switches to a text console first and tries to unload the i915 driver. But ignores failures to do so (it won't work if you still have any application running that uses the gfx driver, e.g. an X server).
# gfxtest/gfx_test.sh
If you chose the right config above, you should be presented with a nice test image. But please be prepared that your console might be stuck in that state afterwards. You can try to run it with i915 deactivated then (e.g. when booting with nomodeset in the kernel command line or with i915 blacklisted) and loading it afterwards.