| Message ID | 299185620.10681.1516214926155@email.1und1.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Stefan, thank you so much for detailed answer. On 01/17/2018 09:48 PM, Stefan Wahren wrote: > Hi Sergey, > >> Sergey Suloev <ssuloev@orpaltech.com> hat am 17. Januar 2018 um 14:45 geschrieben: >> >> >> Hello everyone, >> >> I am trying to use RPi3 VC4 gpu with Qt5 quick/qml. When I run my >> application Qt5 is always complaining about missing vchiq device in the >> system. I know there is vchiq driver available in staging. >> >> My questions are: >> >> 1) What is the current status of the driver ? Is it working at all? > From my point of view it's still experimental. It's mostly the same driver as in downstream, but its function highly dependents on the configuration: > > arm/bcm2835_defconfig = should work > arm/multi_v7_defconfig = may work > arm64/defconfig = won't work [1] > > In order to the function of the driver use vchiq_test from the Raspberry Pi userland. > > Btw testers are always welcome :-) > >> can it be used with Qt5 ? > If your application works with the downstream kernel, there is a high chance. > >> 2) Can I have a working example of DT binding for the driver ? > This is one of my many TODOs [2] to provide a binding document. Please try the following old patch. The cache-line-size depends on the used SoC (BCM2835 = 32, BCM2836/BCM2837 = 64). > > Good luck > > diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi > index e55b362..7398b96 100644 > --- a/arch/arm/boot/dts/bcm2835-rpi.dtsi > +++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi > @@ -27,6 +27,14 @@ > firmware = <&firmware>; > #power-domain-cells = <1>; > }; > + > + vchiq: vchiq { > + compatible = "brcm,bcm2835-vchiq"; > + reg = <0x7e00b840 0xf>; > + interrupts = <0 2>; > + cache-line-size = <64>; > + firmware = <&firmware>; > + }; > }; > }; > > > [1] - https://github.com/lategoodbye/rpi-zero/issues/23 > [2] - https://github.com/lategoodbye/rpi-zero/issues/8 > >> Thanks >> >> >> _______________________________________________ >> linux-arm-kernel mailing list >> linux-arm-kernel@lists.infradead.org >> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi index e55b362..7398b96 100644 --- a/arch/arm/boot/dts/bcm2835-rpi.dtsi +++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi @@ -27,6 +27,14 @@ firmware = <&firmware>; #power-domain-cells = <1>; }; + + vchiq: vchiq { + compatible = "brcm,bcm2835-vchiq"; + reg = <0x7e00b840 0xf>; + interrupts = <0 2>; + cache-line-size = <64>; + firmware = <&firmware>; + }; }; };