On Wed, Nov 28, 2018 at 10:05 AM Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx> wrote:
>
> On Tue, 2018-11-27 at 19:09 +0900, Tomasz Figa wrote:
> > On Fri, Nov 23, 2018 at 5:24 AM Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx> wrote:
> > [snip]
> > > > > +const struct rockchip_vpu_variant rk3288_vpu_variant = {
> > > > > + .enc_offset = 0x0,
> > > > > + .enc_fmts = rk3288_vpu_enc_fmts,
> > > > > + .num_enc_fmts = ARRAY_SIZE(rk3288_vpu_enc_fmts),
> > > > > + .codec_ops = rk3288_vpu_codec_ops,
> > > > > + .codec = RK_VPU_CODEC_JPEG,
> > > > > + .vepu_irq = rk3288_vepu_irq,
> > > > > + .init = rk3288_vpu_hw_init,
> > > > > + .clk_names = {"aclk", "hclk"},
> > > >
> > > > nit: Spaces inside the brackets.
> > > >
> > >
> > > You mean you this style is prefered?
> > >
> > > .clk_names = { "aclk", "hclk" },
> > >
> > > Grepping thru sources, it seems there is no convention on this,
> > > so it's your call.
> > >
> >
> > I thought this is a part of CodingStyle, but it doesn't seem to
> > mention it. I personally prefer to have the spaces there, but we can
> > go with your personal preferences here. :)
>
> OK.
>
> > [snip]
> > > > > + * by .vidioc_s_fmt_vid_cap_mplane() callback
> > > > > + */
> > > > > + reg = VEPU_REG_IN_IMG_CTRL_ROW_LEN(pix_fmt->width);
> > > > > + vepu_write_relaxed(vpu, reg, VEPU_REG_INPUT_LUMA_INFO);
> > > > > +
> > > > > + reg = VEPU_REG_IN_IMG_CTRL_OVRFLR_D4(0) |
> > > > > + VEPU_REG_IN_IMG_CTRL_OVRFLB(0);
> > > >
> > > > For reference, this register controls the input crop, as the offset
> > > > from the right/bottom within the last macroblock. The offset from the
> > > > right must be divided by 4 and so the crop must be aligned to 4 pixels
> > > > horizontally.
> > > >
> > >
> > > OK, I'll add a comment.
> > >
> >
> > I meant to refer to the comment Hans had, about input images of
> > resolutions that are not of full macroblocks, so the comment would
> > probably go to the TODO file together with Hans's note.
>
> Got it.
>
> > [snip]
> > > > > +static inline u32 vepu_read(struct rockchip_vpu_dev *vpu, u32 reg)
> > > > > +{
> > > > > + u32 val = readl(vpu->enc_base + reg);
> > > > > +
> > > > > + vpu_debug(6, "MARK: get reg[%03d]: %08x\n", reg / 4, val);
> > > >
> > > > I remember seeing this "MARK" in the logs when debugging. I don't
> > > > think it's desired here.
> > > >
> > > > How about printing "%s(%03d) = %08x\n" for reads and "%s(%08x,
> > > > %03d)\n" for writes?
> >
> > Actually, I missed the 0x prefix for hex values and possibly also
> > changing the decimal register offset to hexadecimal:
> > "%s(0x%04x) = 0x%08x\n"
> >
> > >
> > > Makes sense, but why a %s string format?
> > >
> >
> > For __func__, so that we end up with messages like:
> >
> > vepu_write(0x12345678, 0x0123)
> > vepu_read(0x0123) = 0x12345678
> >
>
> vepu_debug already uses __func__, so it would look like this:
>
> [ 27.125090] vepu_write_relaxed:215: 0x001f = 0x01010101
> [ 27.127413] vepu_write:221: 0x0069 = 0xfc000000
> [ 27.129673] vepu_write_relaxed:215: 0x0036 = 0x00001000
> [ 27.132079] vepu_write:221: 0x0067 = 0x00f01461
> [ 27.135042] vepu_read:229: 0x006d = 0x00001003
> [ 27.137450] vepu_read:229: 0x0035 = 0x00020318
> [ 27.139778] vepu_write:221: 0x006d = 0x00000000
> [ 27.142144] vepu_write:221: 0x0036 = 0x00000000
>
> Unless we use a different debug macro for i/o access.
>
Okay, I missed that part of vepu_debug(). We can drop the %s and
explicit __func__ from the message then.
> > [snip]
> > > > > + dst->field = src->field;
> > > > > + dst->timecode = src->timecode;
> > > >
> > > > Time code is only valid if the buffer has V4L2_BUF_FLAG_TIMECODE set.
> > > > I don't think there is any use case for mem2mem devices for it.
> > > >
> > >
> > > Right. Other mem2mem drivers seem to pass thru the timecode like this:
> > >
> > > if (in_vb->flags & V4L2_BUF_FLAG_TIMECODE)
> > > out_vb->timecode = in_vb->timecode;
> > >
> > > It fails a v4l2-compliance test without it.
> > >
> >
> > Hmm, I don't see the spec defining it to be copied by a mem2mem device
> > and I wonder if it's actually of any use for those. Hans, could you
> > comment on this?
> >
>
> I asked Hans about this and he said timecode should behave as timestamp,
> and be carried from the output queue to the capture queue.
>
> This helper will take care of it: https://patchwork.linuxtv.org/patch/52961/
>
Fair enough.
Best regards,
Tomasz
