| commit | 3f86b0b121ff5f07d5d1ab5c1b210ea92620bb30 | [log] [tgz] |
|---|---|---|
| author | Angel Pons <th3fanbus@gmail.com> | Sat Jul 18 00:22:32 2020 +0200 |
| committer | Nico Huber <nico.h@gmx.de> | Sun Jul 19 17:38:39 2020 +0000 |
| tree | 8bef2905e89040626ee649e5ae1f1f85c1488112 | |
| parent | c0db994900fe9dabff9efd1b7fc547288a68c6c0 [diff] |
Move `PSR_Off` out of `Power_And_Clocks_Haswell` Allowing other platforms to use the Haswell-specific power and clocks package precludes with'ing other Haswell-specific units unless they are placed under `haswell_shared` as well. This unnecessarily forces several implementation-specific details to be public, breaking encapsulation. The only benefit is that the `PSR_Off` procedure gets to be shared. However, we can allow reusing said procedure without having to destroy encapsulation, by moving it elsewhere. As the SRD/PSR registers are tied to transcoders, place `PSR_Off` and the corresponding definitions to the common `Transcoder` package. Also update the callers of this procedure to refer to the `Transcoder` package, and then drop the visibility of the power and clocks package for Haswell. Change-Id: I7483409b8b7db58874cbba3c0a7edb1968bba456 Signed-off-by: Angel Pons <th3fanbus@gmail.com> Reviewed-on: https://review.coreboot.org/c/libgfxinit/+/43563 Tested-by: Nico Huber <nico.h@gmx.de> Reviewed-by: Nico Huber <nico.h@gmx.de>
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 verifica- tion 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 reposi- tories 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 de- scribed 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 re- stores it before exiting. This works somehow even while the i915 driver is running. A wrapper script gfxtest/gfx_test.sh is pro- vided 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.