Re: [RFC V3 0/2] arm64: imx8mm: Enable Hantro VPUs

Adam Ford
2021-12-02T21:00:42Z

On Thu, Dec 2, 2021 at 12:54 PM Tim Harvey <tharvey@gateworks.com> wrote:
>
> On Thu, Dec 2, 2021 at 4:29 AM Adam Ford <aford173@gmail.com> wrote:
> >
> > On Wed, Dec 1, 2021 at 10:17 PM Adam Ford <aford173@gmail.com> wrote:
> > >
> > > The i.MX8M has two Hantro video decoders, called G1 and G2 which appear
> > > to be related to the video decoders used on the i.MX8MQ, but because of
> > > how the Mini handles the power domains, the VPU driver does not need to
> > > handle all the functions, so a new compatible flag is required.
> > >
> > > V3 is rebased from git://linuxtv.org/hverkuil/media_tree.git for-v5.17c
> > > This branch has support for VP9.
> > >
> > > I set cma=512M, but this may not be enough memory as some tests appeard to run out of memory
> > >
> > > V3 of this series has several changes:
> > >
> > > Update imx8m_vpu_hw to add missing 'reg' reference names for G2 and include references to VP9
> > > Update device tree to remove IMX8MQ_VPU_RESET, remove some duplicate vpu clock parenting
> > > Fix missing reg-names from vpu_g2 node.
> > > Apply patch [1] to manage the power domains powering down.
> > > [1] - https://lore.kernel.org/linux-arm-kernel/20211016210547.171717-1-marex@denx.de/t/
> > >
> > > With the above, the following Fluster scores are produced:
> > >
> > > G1:
> > > ./fluster.py run -dGStreamer-H.264-V4L2SL-Gst1.0
> > > Ran 90/135 tests successfully in 74.406 secs
> > >
> > > ./fluster.py run -d GStreamer-VP8-V4L2SL-Gst1.0
> > > Ran 55/61 tests successfully in 8.080 secs
> > >
> > > G2:
> > > ./fluster.py run -d GStreamer-VP9-V4L2SL-Gst1.0
> > > Ran 127/303 tests successfully in 203.873 secs
> > >
> > > Fluster and G-Streamer were both built from their respective git repos using their respective master/main branches.
> > >
> >
> > I should note, that both interrupts appear to be triggering.
> >
> > # cat /proc/interrupts |grep codec
> > 57: 13442 0 0 0 GICv3 39 Level
> > 38300000.video-codec
> > 58: 7815 0 0 0 GICv3 40 Level
> > 38310000.video-codec
> >
>
> Adam,
>
> On another thread you had let me know that you also removed the reset
> from the pgc_vpumix power domain which does appear to resolve the
> hang:
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> index eb9dcd9d1a31..31710af544dc 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
> @@ -681,7 +681,6 @@
> clocks = <&clk
> IMX8MM_CLK_VPU_DEC_ROOT>;
> assigned-clocks =
> <&clk IMX8MM_CLK_VPU_BUS>;
> assigned-clock-parents
> = <&clk IMX8MM_SYS_PLL1_800M>;
> - resets = <&src
> IMX8MQ_RESET_VPU_RESET>;
> };
>
> pgc_vpu_g1: power-domain@7 {
>
> That would make such a patch have a 'Fixes commit d39d4bb15310
> ("arm64: dts: imx8mm: add GPC node")' but of course that vpu domain
> isn't active until your series so I'm not sure if we should send this
> separate or squash it with "arm64: dts: imx8mm: Enable VPU-G1 and
> VPU-G2". I'm also not clear if removing the reset requires some
> further discussion with Lucas.

Unless there is objection from Lucas, I'll likely make it the first
patch in the series marking it with a fixes tag so it gets backported,
then the rest of the series would be adding the bindings, update the
driver and adding the G1 and G2 nodes.

adam
>
> Best regards,
>
> Tim