[yocto] [meta-raspberrypi][PATCH 2/8] Support for vc4 graphics driver: add vc4-kms-v3d to the overlays

[Herve Jourdain]

Hi Khem,

Well, it seems to be the way it will be activated in the future as well, through a device tree overlay.
The rationale being that people may not want/need the VC4 driver, because they prefer to use userland or other reasons, and that only the persons who want to activate it will load the overlay.
One thing to remember is that vc4 has the potential to conflict with other pieces, and it might not be for everybody (the firmware patch helps in that regards, but before it, weston/drm was conflicting with the splash screen for instance on my test setup, creating very disturbing images).

If your question is, will userland disappear one day and vc4 graphics becoming the only graphics driver, the overlay could be included in the base device tree itself, in like a few years from now, then I clearly don't have an answer to that...

But I believe the overlay will stick some time around.

Herve

> Le 19 mai 2016 à 00:53, Khem Raj <raj.khem at gmail.com> a écrit :
> 
> 
>> On May 18, 2016, at 5:21 AM, Herve Jourdain <herve.jourdain at neuf.fr> wrote:
>> 
>> This patch series enables the support for the VC4 graphics driver from Eric Anholt.
>> Add vc4-kms-v3d overlay if 'vc4graphics' is in MACHINE_FEATURES.
>> (This patch has a dependency on the patch that enables the support of .dtbo overlay files)
>> 
>> Signed-off-by: Herve Jourdain <herve.jourdain at neuf.fr>
>> ---
>> recipes-bsp/bootfiles/rpi-config_git.bb | 8 ++++++++
>> 1 file changed, 8 insertions(+)
>> 
>> diff --git a/recipes-bsp/bootfiles/rpi-config_git.bb b/recipes-bsp/bootfiles/rpi-config_git.bb
>> index 4bc8eb7..79e436d 100644
>> --- a/recipes-bsp/bootfiles/rpi-config_git.bb
>> +++ b/recipes-bsp/bootfiles/rpi-config_git.bb
>> @@ -19,6 +19,8 @@ PITFT="${@bb.utils.contains("MACHINE_FEATURES", "pitft", "1", "0", d)}"
>> PITFT22="${@bb.utils.contains("MACHINE_FEATURES", "pitft22", "1", "0", d)}"
>> PITFT28r="${@bb.utils.contains("MACHINE_FEATURES", "pitft28r", "1", "0", d)}"
>> 
>> +VC4GRAPHICS="${@bb.utils.contains("MACHINE_FEATURES", "vc4graphics", "1", "0", d)}"
>> +
>> inherit deploy
>> 
>> do_deploy() {
>> @@ -102,6 +104,12 @@ do_deploy() {
>>        echo "# Enable UART" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
>>        echo "enable_uart=1" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
>>    fi
>> +
>> +    # VC4 Graphics support
>> +    if [ "${VC4GRAPHICS}" = "1" ]; then
>> +        echo "# Enable VC4 Graphics" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
>> +        echo "dtoverlay=vc4-kms-v3d,cma-256" >>${DEPLOYDIR}/bcm2835-bootfiles/config.txt
>> +    fi
> 
> 
> will this keep appending overtime ?
> 
>> }
>> 
>> addtask deploy before do_package after do_install
>> --
>> 2.7.4
>> 
>> --
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>