linux-kernel - Re: [PATCH v2 for 5.4 2/4] media: hantro: Fix H264 max frmsize supported on RK3288

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Date:   Thu, 10 Oct 2019 16:23:56 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     Jonas Karlman <jonas@...boo.se>
Cc:     Ezequiel Garcia <ezequiel@...labora.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        "kernel@...labora.com" <kernel@...labora.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Alexandre Courbot <acourbot@...omium.org>,
        "fbuergisser@...omium.org" <fbuergisser@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Douglas Anderson <dianders@...omium.org>
Subject: Re: [PATCH v2 for 5.4 2/4] media: hantro: Fix H264 max frmsize
 supported on RK3288

On Tue, Oct 8, 2019 at 11:12 PM Jonas Karlman <jonas@...boo.se> wrote:
>
> On 2019-10-08 15:53, Tomasz Figa wrote:
> > On Tue, Oct 8, 2019 at 10:35 PM Tomasz Figa <tfiga@...omium.org> wrote:
> >> On Tue, Oct 8, 2019 at 7:42 PM Tomasz Figa <tfiga@...omium.org> wrote:
> >>> On Tue, Oct 8, 2019 at 3:31 PM Jonas Karlman <jonas@...boo.se> wrote:
> >>>> On 2019-10-08 07:27, Tomasz Figa wrote:
> >>>>> Hi Ezequiel, Jonas,
> >>>>>
> >>>>> On Tue, Oct 8, 2019 at 2:46 AM Ezequiel Garcia <ezequiel@...labora.com> wrote:
> >>>>>> From: Jonas Karlman <jonas@...boo.se>
> >>>>>>
> >>>>>> TRM specify supported image size 48x48 to 4096x2304 at step size 16 pixels,
> >>>>>> change frmsize max_width/max_height to match TRM.
> >>>>>>
> >>>>>> Fixes: 760327930e10 ("media: hantro: Enable H264 decoding on rk3288")
> >>>>>> Signed-off-by: Jonas Karlman <jonas@...boo.se>
> >>>>>> ---
> >>>>>> v2:
> >>>>>> * No changes.
> >>>>>>
> >>>>>>  drivers/staging/media/hantro/rk3288_vpu_hw.c | 4 ++--
> >>>>>>  1 file changed, 2 insertions(+), 2 deletions(-)
> >>>>>>
> >>>>>> diff --git a/drivers/staging/media/hantro/rk3288_vpu_hw.c b/drivers/staging/media/hantro/rk3288_vpu_hw.c
> >>>>>> index 6bfcc47d1e58..ebb017b8a334 100644
> >>>>>> --- a/drivers/staging/media/hantro/rk3288_vpu_hw.c
> >>>>>> +++ b/drivers/staging/media/hantro/rk3288_vpu_hw.c
> >>>>>> @@ -67,10 +67,10 @@ static const struct hantro_fmt rk3288_vpu_dec_fmts[] = {
> >>>>>>                 .max_depth = 2,
> >>>>>>                 .frmsize = {
> >>>>>>                         .min_width = 48,
> >>>>>> -                       .max_width = 3840,
> >>>>>> +                       .max_width = 4096,
> >>>>>>                         .step_width = H264_MB_DIM,
> >>>>>>                         .min_height = 48,
> >>>>>> -                       .max_height = 2160,
> >>>>>> +                       .max_height = 2304,
> >>>>> This doesn't match the datasheet I have, which is RK3288 Datasheet Rev
> >>>>> 1.4 and which has the values as in current code. What's the one you
> >>>>> got the values from?
> >>>> The RK3288 TRM vcodec chapter from [1], unknown revision and date, lists 48x48 to 4096x2304 step size 16 pixels under 25.5.1 H.264 decoder.
> >>>>
> >>>> I can also confirm that one of my test samples (PUPPIES BATH IN 4K) is 4096x2304 and can be decoded after this patch.
> >>>> However the decoding speed is not optimal at 400Mhz, if I recall correctly you need to set the VPU1 clock to 600Mhz for 4K decoding on RK3288.
> >>>>
> >>>> I am not sure if I should include a v2 of this patch in my v2 series, as-is this patch do not apply on master (H264_MB_DIM has changed to MB_DIM in master).
> >>>>
> >>>> [1] http://www.t-firefly.com/download/firefly-rk3288/docs/TRM/rk3288-chapter-25-video-encoder-decoder-unit-(vcodec).pdf
> >>> I checked the RK3288 TRM V1.1 too and it refers to 3840x2160@...ps as
> >>> the maximum.
> >>>
> >>> As for performance, we've actually been getting around 33 fps at 400
> >>> MHz with 3840x2160 on our devices (the old RK3288 Asus Chromebook
> >>> Flip).
> >>>
> >>> I guess we might want to check that with Hantro.
> >> Could you check the value of bits 10:0 in register at 0x0c8? That
> >> should be the maximum supported stream width in the units of 16
> >> pixels.
> > Correction: The unit is 1 pixel and there are additional 2 most
> > significant bits at 0x0d8, 15:14.
>
> I will check this later tonight when I have access to my devices.
> The PUPPIES BATH IN 4K (4096x2304) sample decoded without issue using rockchip 4.4 BSP kernel and mpp last time I tested.
>
> The vcodec driver in 4.4 BSP kernel use 300/400 Mhz as default clock rate and will change to 600 Mhz when width is over 2560, see [1]:
>   raise frequency for resolution larger than 1440p avc
>
> [1] https://github.com/rockchip-linux/kernel/blob/develop-4.4/drivers/video/rockchip/vcodec/vcodec_service.c#L2551-L2570

How comes it works for us well at 400 MHz? Better DRAM? Differences in
how Vcodec BSP handles the hardware that somehow make the decoding
slower?

Best regards,
Tomasz