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Date: Mon, 7 Jan 2019 00:15:48 +0800
From: Ayaka <ayaka@...lik.info>
To: Ezequiel Garcia <ezequiel@...labora.com>
Cc: linux-rockchip@...ts.infradead.org,
Tomasz Figa <tfiga@...omium.org>,
nicolas.dufresne@...labora.com, myy@...uyouyou.fr,
paul.kocialkowski@...tlin.com, mchehab@...nel.org,
linux-media@...r.kernel.org, hverkuil@...all.nl, heiko@...ech.de,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] arm64: dts: rockchip: add video codec for rk3399
Sent from my iPad
> On Jan 7, 2019, at 12:04 AM, Ezequiel Garcia <ezequiel@...labora.com> wrote:
>
> On Sun, 2019-01-06 at 23:05 +0800, Ayaka wrote:
>>> On Jan 6, 2019, at 10:22 PM, Ezequiel Garcia <ezequiel@...labora.com> wrote:
>>>
>>> Hi Randy,
>>>
>>> Thanks a lot for this patches. They are really useful
>>> to provide more insight into the VPU hardware.
>>>
>>> This change will make the vpu encoder and vpu decoder
>>> completely independent, can they really work in parallel?
>> As I said it depends on the platform, but with this patch, the user space would think they can work at the same time.
>
>
> I think there is some confusion.
>
> The devicetree is one thing: it is a hardware representation,
> a way to describe the hardware, for the kernel/bootloader to
> parse.
>
> The userspace view will depend on the driver implementation.
>
> The current devicetree and driver (without your patches),
> model the VPU as a single piece of hardware, exposing a decoder
> and an encoder.
>
> The V4L driver will then create two video devices, i.e. /dev/videoX
> and /dev/videoY. So userspace sees an independent view of the
> devices.
>
I knew that, the problem is that the driver should not always create a decoder and encoder pair, they may not exist at some platforms, even some platforms doesn’t have a encoder. You may have a look on the rk3328 I post on the first email as example.
> However, they are internally connected, and thus we can
> easily avoid two jobs running in parallel.
>
That is what the mpp service did in my patches, handing the relationship between each devices. And it is not a easy work, maybe a 4k decoder would be blocked by another high frame rate encoding work or another decoder session. The vendor kernel have more worry about this, but not in this version.
> So, in other words, if the VPU can issue a decoder and encoder
> job in parallel, then it's useful to model it as two independent
> devices. Otherwise, it's better not to.
>
> I hope this can clarify things a bit for you!
>
I would review the request API for those codecs structures and some basic designs, people from LibreELEC told me a few noticed inform.
> PS: Too bad I won't be at FOSDEM to discuss this personally.
I am sure Paulk from bootlin would be there and some others guy related, I have not cared about this for a little long time, there are more huge problem I should point out now.
>
> Thanks,
> Ezequiel
>
>> BTW, not only the decoder, there is a post processor with the decoder, it can be used as part of the decoder pipeline with only a macro block delay
>> or process the data from an external buffer.
>> I forget to write a note on what this driver doesn’t present. The real one would have much complex scheduler system, but this one is just a queue.
>> More task management feature are not there.
>> Also the clock boosting is removing and the loading analysis, which are useful for encoder, especially on the rv1108.
>>> Could you provide more details about what is
>>> shared between these devices?
>> No, if Rockchip doesn’t tell, my mouth is sealed.
>>> Thanks a lot!
>>>
>>>> On Sun, 2019-01-06 at 02:31 +0800, Randy Li wrote:
>>>> It offers an example how a full features video codec
>>>> should be configured.
>>>>
>>>> The original clocks assignment don't look good, if the clocks
>>>> lower than 300MHZ, most of decoing tasks would suffer from
>>>> timeout problem, 500MHZ is also a little high for RK3399
>>>> running in a stable state.
>>>>
>>>> Signed-off-by: Randy Li <ayaka@...lik.info>
>>>> ---
>>>> .../boot/dts/rockchip/rk3399-sapphire.dtsi | 29 ++++++++
>>>> arch/arm64/boot/dts/rockchip/rk3399.dtsi | 68 +++++++++++++++++--
>>>> 2 files changed, 90 insertions(+), 7 deletions(-)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
>>>> index 946d3589575a..c3db878bae45 100644
>>>> --- a/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
>>>> +++ b/arch/arm64/boot/dts/rockchip/rk3399-sapphire.dtsi
>>>> @@ -632,6 +632,35 @@
>>>> dr_mode = "host";
>>>> };
>>>>
>>>> +&rkvdec {
>>>> + status = "okay";
>>>> +};
>>>> +
>>>> +&rkvdec_srv {
>>>> + status = "okay";
>>>> +};
>>>> +
>>>> +&vdec_mmu {
>>>> + status = "okay";
>>>> +};
>>>> +
>>>> +&vdpu {
>>>> + status = "okay";
>>>> +};
>>>> +
>>>> +&vepu {
>>>> + status = "okay";
>>>> +};
>>>> +
>>>> +&vpu_service {
>>>> + status = "okay";
>>>> +};
>>>> +
>>>> +&vpu_mmu {
>>>> + status = "okay";
>>>> +
>>>> +};
>>>> +
>>>> &vopb {
>>>> status = "okay";
>>>> };
>>>> diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
>>>> index b22b2e40422b..5fa3247e7bf0 100644
>>>> --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
>>>> +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
>>>> @@ -1242,16 +1242,39 @@
>>>> status = "disabled";
>>>> };
>>>>
>>>> - vpu: video-codec@...50000 {
>>>> - compatible = "rockchip,rk3399-vpu";
>>>> - reg = <0x0 0xff650000 0x0 0x800>;
>>>> - interrupts = <GIC_SPI 114 IRQ_TYPE_LEVEL_HIGH 0>,
>>>> - <GIC_SPI 113 IRQ_TYPE_LEVEL_HIGH 0>;
>>>> - interrupt-names = "vepu", "vdpu";
>>>> + vpu_service: vpu-srv {
>>>> + compatible = "rockchip,mpp-service";
>>>> + status = "disabled";
>>>> + };
>>>> +
>>>> + vepu: vpu-encoder@...50000 {
>>>> + compatible = "rockchip,vpu-encoder-v2";
>>>> + reg = <0x0 0xff650000 0x0 0x400>;
>>>> + interrupts = <GIC_SPI 114 IRQ_TYPE_LEVEL_HIGH 0>;
>>>> + interrupt-names = "irq_enc";
>>>> clocks = <&cru ACLK_VCODEC>, <&cru HCLK_VCODEC>;
>>>> - clock-names = "aclk", "hclk";
>>>> + clock-names = "aclk_vcodec", "hclk_vcodec";
>>>> + resets = <&cru SRST_H_VCODEC>, <&cru SRST_A_VCODEC>;
>>>> + reset-names = "video_h", "video_a";
>>>> iommus = <&vpu_mmu>;
>>>> power-domains = <&power RK3399_PD_VCODEC>;
>>>> + rockchip,srv = <&vpu_service>;
>>>> + status = "disabled";
>>>> + };
>>>> +
>>>> + vdpu: vpu-decoder@...50400 {
>>>> + compatible = "rockchip,vpu-decoder-v2";
>>>> + reg = <0x0 0xff650400 0x0 0x400>;
>>>> + interrupts = <GIC_SPI 113 IRQ_TYPE_LEVEL_HIGH 0>;
>>>> + interrupt-names = "irq_dec";
>>>> + iommus = <&vpu_mmu>;
>>>> + clocks = <&cru ACLK_VCODEC>, <&cru HCLK_VCODEC>;
>>>> + clock-names = "aclk_vcodec", "hclk_vcodec";
>>>> + resets = <&cru SRST_H_VCODEC>, <&cru SRST_A_VCODEC>;
>>>> + reset-names = "video_h", "video_a";
>>>> + power-domains = <&power RK3399_PD_VCODEC>;
>>>> + rockchip,srv = <&vpu_service>;
>>>> + status = "disabled";
>>>> };
>>>>
>>>> vpu_mmu: iommu@...50800 {
>>>> @@ -1261,11 +1284,42 @@
>>>> interrupt-names = "vpu_mmu";
>>>> clocks = <&cru ACLK_VCODEC>, <&cru HCLK_VCODEC>;
>>>> clock-names = "aclk", "iface";
>>>> + assigned-clocks = <&cru ACLK_VCODEC_PRE>;
>>>> + assigned-clock-parents = <&cru PLL_GPLL>;
>>>> #iommu-cells = <0>;
>>>> power-domains = <&power RK3399_PD_VCODEC>;
>>>> status = "disabled";
>>>> };
>>>>
>>>> + rkvdec_srv: rkvdec-srv {
>>>> + compatible = "rockchip,mpp-service";
>>>> + status = "disabled";
>>>> + };
>>>> +
>>>> + rkvdec: video-decoder@...60000 {
>>>> + compatible = "rockchip,video-decoder-v1";
>>>> + reg = <0x0 0xff660000 0x0 0x400>;
>>>> + interrupts = <GIC_SPI 116 IRQ_TYPE_LEVEL_HIGH 0>;
>>>> + interrupt-names = "irq_dec";
>>>> + clocks = <&cru ACLK_VDU>, <&cru HCLK_VDU>,
>>>> + <&cru SCLK_VDU_CA>, <&cru SCLK_VDU_CORE>;
>>>> + clock-names = "aclk_vcodec", "hclk_vcodec",
>>>> + "clk_cabac", "clk_core";
>>>> + assigned-clocks = <&cru ACLK_VDU_PRE>, <&cru SCLK_VDU_CA>,
>>>> + <&cru SCLK_VDU_CORE>;
>>>> + assigned-clock-parents = <&cru PLL_NPLL>, <&cru PLL_NPLL>,
>>>> + <&cru PLL_NPLL>;
>>>> + resets = <&cru SRST_H_VDU>, <&cru SRST_A_VDU>,
>>>> + <&cru SRST_VDU_CORE>, <&cru SRST_VDU_CA>,
>>>> + <&cru SRST_A_VDU_NOC>, <&cru SRST_H_VDU_NOC>;
>>>> + reset-names = "video_h", "video_a", "video_core", "video_cabac",
>>>> + "niu_a", "niu_h";
>>>> + power-domains = <&power RK3399_PD_VDU>;
>>>> + rockchip,srv = <&rkvdec_srv>;
>>>> + iommus = <&vdec_mmu>;
>>>> + status = "disabled";
>>>> + };
>>>> +
>>>> vdec_mmu: iommu@...60480 {
>>>> compatible = "rockchip,iommu";
>>>> reg = <0x0 0xff660480 0x0 0x40>, <0x0 0xff6604c0 0x0 0x40>;
>
>
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