Re: [PATCH 5/5] media: hantro: Add support for the Rockchip PX30

[Paul Kocialkowski <paul.kocialkowski@bootlin.com>]

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Hi Ezequiel,

On Thu 07 Jan 21, 16:08, Ezequiel Garcia wrote:
> Happy to see this patch. It was on my TODO list,
> but I hadn't had time to bringup my rk3326 device.

Same here, I just had an occasion to use it again these days so I jumped
on it!

> A few comments.
> 
> On Thu, 2021-01-07 at 14:41 +0100, Paul Kocialkowski wrote:
> > The PX30 SoC includes both the VDPU2 and VEPU2 blocks which are similar
> > to the RK3399 (Hantro G1/H1 with shuffled registers).
> > 
> > Besides taking an extra clock, it also shares an interrupt with the IOMMU
> > so it's necessary to request the interrupt shared.
> > 
> 
> Could you clarify on the commit description which iommu device interrupt
> line is being shared?

Sure! It's IRQ 79 of the GIC that's shared with vopl_mmu.
It's not very obvious in the dt commit.

> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > ---
> >  drivers/staging/media/hantro/hantro_drv.c    |  5 +++--
> >  drivers/staging/media/hantro/hantro_hw.h     |  1 +
> >  drivers/staging/media/hantro/rk3399_vpu_hw.c | 21 ++++++++++++++++++++
> >  3 files changed, 25 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/staging/media/hantro/hantro_drv.c b/drivers/staging/media/hantro/hantro_drv.c
> > index e5f200e64993..076a7782b476 100644
> > --- a/drivers/staging/media/hantro/hantro_drv.c
> > +++ b/drivers/staging/media/hantro/hantro_drv.c
> > @@ -472,6 +472,7 @@ static const struct v4l2_file_operations hantro_fops = {
> >  
> >  static const struct of_device_id of_hantro_match[] = {
> >  #ifdef CONFIG_VIDEO_HANTRO_ROCKCHIP
> > +       { .compatible = "rockchip,px30-vpu", .data = &px30_vpu_variant, },
> >         { .compatible = "rockchip,rk3399-vpu", .data = &rk3399_vpu_variant, },
> >         { .compatible = "rockchip,rk3328-vpu", .data = &rk3328_vpu_variant, },
> >         { .compatible = "rockchip,rk3288-vpu", .data = &rk3288_vpu_variant, },
> > @@ -796,8 +797,8 @@ static int hantro_probe(struct platform_device *pdev)
> >                         return -ENXIO;
> >  
> >                 ret = devm_request_irq(vpu->dev, irq,
> > -                                      vpu->variant->irqs[i].handler, 0,
> > -                                      dev_name(vpu->dev), vpu);
> > +                                      vpu->variant->irqs[i].handler,
> > +                                      IRQF_SHARED, dev_name(vpu->dev), vpu);
> 
> Maybe this irq flag should be part of vpu->variant? It sounds like an IP block
> integration specific thing.

Ah right, I agree that it would be justified. But it would also be simple to
just fix the irq handlers and assume this can generally be the case, because it
feels like a bit of a detail to justify a flag.

Do you think this could be a safe/workable assumption?

> Also, you will need a px30-specific interrupt handler now,
> since the rk3399 one is not shared-friendly.

Yeah I realize I haven't been very careful there and didn't really check that
the IOMMU driver is really safe to handle shared interrupts either. I'll take
a look a that when crafting v2.

> >                 if (ret) {
> >                         dev_err(vpu->dev, "Could not request %s IRQ.\n",
> >                                 irq_name);
> > diff --git a/drivers/staging/media/hantro/hantro_hw.h b/drivers/staging/media/hantro/hantro_hw.h
> > index 34c9e4649a25..07f516fd7a2e 100644
> > --- a/drivers/staging/media/hantro/hantro_hw.h
> > +++ b/drivers/staging/media/hantro/hantro_hw.h
> > @@ -148,6 +148,7 @@ enum hantro_enc_fmt {
> >         RK3288_VPU_ENC_FMT_UYVY422 = 3,
> >  };
> >  
> > +extern const struct hantro_variant px30_vpu_variant;
> >  extern const struct hantro_variant rk3399_vpu_variant;
> >  extern const struct hantro_variant rk3328_vpu_variant;
> >  extern const struct hantro_variant rk3288_vpu_variant;
> > diff --git a/drivers/staging/media/hantro/rk3399_vpu_hw.c b/drivers/staging/media/hantro/rk3399_vpu_hw.c
> > index 7a7962cf771e..4112f98baa60 100644
> > --- a/drivers/staging/media/hantro/rk3399_vpu_hw.c
> > +++ b/drivers/staging/media/hantro/rk3399_vpu_hw.c
> 
> Perhaps it's time to rename this to rockchip_vpu_hw.c,
> and merge rk3288 and rk3399? It's a nitpick, though.

Haha, I was thinking the exact same thing but wasn't sure it would be welcome!

I was thinking of rockchip_vpu2_hw.c or rockchip_vdpu2_hw.c since that's
apparently how it's called in Rockchip terminology: VDPU2 and VEPU2 for the
Hantro G1 and H1 with the shuffled register layout. The rk3288 stuff is
probably VDPU1/VEPU1 and we might want to rename it accordingly as well.

Cheers and thanks for the review!

Paul

> > @@ -220,3 +220,24 @@ const struct hantro_variant rk3328_vpu_variant = {
> >         .clk_names = rk3399_clk_names,
> >         .num_clocks = ARRAY_SIZE(rk3399_clk_names),
> >  };
> > +
> > +static const char * const px30_clk_names[] = {
> > +       "aclk", "hclk", "sclk"
> > +};
> > +
> > +const struct hantro_variant px30_vpu_variant = {
> > +       .enc_offset = 0x0,
> > +       .enc_fmts = rk3399_vpu_enc_fmts,
> > +       .num_enc_fmts = ARRAY_SIZE(rk3399_vpu_enc_fmts),
> > +       .dec_offset = 0x400,
> > +       .dec_fmts = rk3399_vpu_dec_fmts,
> > +       .num_dec_fmts = ARRAY_SIZE(rk3399_vpu_dec_fmts),
> > +       .codec = HANTRO_JPEG_ENCODER | HANTRO_MPEG2_DECODER |
> > +                HANTRO_VP8_DECODER,
> > +       .codec_ops = rk3399_vpu_codec_ops,
> > +       .irqs = rk3399_irqs,
> > +       .num_irqs = ARRAY_SIZE(rk3399_irqs),
> > +       .init = rk3399_vpu_hw_init,
> > +       .clk_names = px30_clk_names,
> > +       .num_clocks = ARRAY_SIZE(px30_clk_names)
> > +};
> 
> Thanks,
> Ezequiel
> 

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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