Re: Re: [PATCH] drm/sun4i: mixer: fix scanline for V3s and D1

["Jernej Škrabec" <jernej.skrabec@gmail.com>]

Dne torek, 24. maj 2022 ob 19:07:27 CEST je Samuel Holland napisal(a):
> On 5/23/22 8:14 AM, Icenowy Zheng wrote:
> > 在 2022-05-22星期日的 10:36 +0200，Jernej Škrabec写道：
> >> Hi!
> >>
> >> Dne sobota, 21. maj 2022 ob 15:34:43 CEST je Genfu Pan napisal(a):
> >>> Accrording the SDK from Allwinner, the scanline value of yuv and
> >>> rgb for
> >>> V3s are both 1024.
> >>
> >> s/scanline value/scanline length/
> >>
> >> Which SDK? All SDKs that I have or found on internet don't mention
> >> YUV nor RGB 
> >> scanline limit. That doesn't mean there is none, I'm just unable to
> >> verify 
> >> your claim. Did you test this by yourself? Also, please make YUV
> >> scanline 
> >> change separate patch with fixes tag.
> > 
> > BTW I think chip manuals all say that the chip supports NxN resolution
> > in DE2 chapter, e.g. the V3 datasheet says DE2 "Output size up to
> > 1024x1024".
> > 
> > However there's no information about D1's second mixer.
> 
> My information comes from the BSP driver[0]:
> 
> static const int sun8iw20_de_scale_line_buffer[] = {
>         /* DISP0 */
>         2048,
>         /* DISP1 */
>         1024,
> };
> 
> It looks like the value returned from de_feat_get_scale_linebuf() may be 
used
> for RGB as well, if scaling is enabled. This appears to be the "format == 3"
> case in de_rtmx_get_coarse_fac[1]. On the other hand, the code for V3 has
> specific code for the RGB limit[2].
> 
> Is there some test I can do on D1 to see what the right value for RGB is?

I use modetest for such tests. It's part of libdrm. In general, you want to 
make plane wider than scanline and then scale it down. Obviously you want to 
test this once with RGB and once with YUV format. This is all done with 
"modetest -P".

Best regards,
Jernej

> 
> Regards,
> Samuel
> 
> [0]:
> https://github.com/Tina-Linux/tina-d1x-linux-5.4/blob/master/drivers/video/
fbdev/sunxi/disp2/disp/de/lowlevel_v2x/de_feat.c#L182
> [1]:
> https://github.com/Tina-Linux/tina-d1x-linux-5.4/blob/master/drivers/video/
fbdev/sunxi/disp2/disp/de/lowlevel_v2x/de_rtmx.c#L1588
> [2]:
> https://github.com/Tina-Linux/tina-d1x-linux-5.4/blob/master/drivers/video/
fbdev/sunxi/disp2/disp/de/lowlevel_sun8iw8/de_rtmx.c#L1211
> 
> >>> The is also the same for mixer 1 of D1. Currently the
> >>> scanline value of rgb is hardcoded to 2048 for all SOCs.
> >>>
> >>> Change the scanline_yuv property of V3s to 1024. > Add the
> >>> scanline_rgb
> >>> property to the mixer config and replace the hardcoded value with
> >>> it before
> >>> scaling.
> >>
> >> I guess RGB scanline patch would also need fixes tag, since it fixes
> >> existing 
> >> bug.
> >>
> >>>
> >>> Signed-off-by: Genfu Pan <benlypan@gmail.com>
> >>> ---
> >>>  drivers/gpu/drm/sun4i/sun8i_mixer.c    | 13 ++++++++++++-
> >>>  drivers/gpu/drm/sun4i/sun8i_mixer.h    |  1 +
> >>>  drivers/gpu/drm/sun4i/sun8i_vi_layer.c |  3 +--
> >>>  3 files changed, 14 insertions(+), 3 deletions(-)
> >>>
> >>> diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c
> >>> b/drivers/gpu/drm/sun4i/sun8i_mixer.c index 875a1156c..e64e08207
> >>> 100644
> >>> --- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
> >>> +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
> >>> @@ -567,6 +567,7 @@ static const struct sun8i_mixer_cfg
> >>> sun8i_a83t_mixer0_cfg = { .ccsc         = CCSC_MIXER0_LAYOUT,
> >>>         .scaler_mask    = 0xf,
> >>>         .scanline_yuv   = 2048,
> >>> +       .scanline_rgb   = 2048,
> >>>         .ui_num         = 3,
> >>>         .vi_num         = 1,
> >>>  };
> >>> @@ -575,6 +576,7 @@ static const struct sun8i_mixer_cfg
> >>> sun8i_a83t_mixer1_cfg = { .ccsc         = CCSC_MIXER1_LAYOUT,
> >>>         .scaler_mask    = 0x3,
> >>>         .scanline_yuv   = 2048,
> >>> +       .scanline_rgb   = 2048,
> >>>         .ui_num         = 1,
> >>>         .vi_num         = 1,
> >>>  };
> >>> @@ -584,6 +586,7 @@ static const struct sun8i_mixer_cfg
> >>> sun8i_h3_mixer0_cfg
> >>> = { .mod_rate   = 432000000,
> >>>         .scaler_mask    = 0xf,
> >>>         .scanline_yuv   = 2048,
> >>> +       .scanline_rgb   = 2048,
> >>>         .ui_num         = 3,
> >>>         .vi_num         = 1,
> >>>  };
> >>> @@ -593,6 +596,7 @@ static const struct sun8i_mixer_cfg
> >>> sun8i_r40_mixer0_cfg
> >>> = { .mod_rate   = 297000000,
> >>>         .scaler_mask    = 0xf,
> >>>         .scanline_yuv   = 2048,
> >>> +       .scanline_rgb   = 2048,
> >>>         .ui_num         = 3,
> >>>         .vi_num         = 1,
> >>>  };
> >>> @@ -602,6 +606,7 @@ static const struct sun8i_mixer_cfg
> >>> sun8i_r40_mixer1_cfg
> >>> = { .mod_rate   = 297000000,
> >>>         .scaler_mask    = 0x3,
> >>>         .scanline_yuv   = 2048,
> >>> +       .scanline_rgb   = 2048,
> >>>         .ui_num         = 1,
> >>>         .vi_num         = 1,
> >>>  };
> >>> @@ -610,7 +615,8 @@ static const struct sun8i_mixer_cfg
> >>> sun8i_v3s_mixer_cfg
> >>> = { .vi_num = 2,
> >>>         .ui_num = 1,
> >>>         .scaler_mask = 0x3,
> >>> -       .scanline_yuv = 2048,
> >>> +       .scanline_yuv = 1024,
> >>> +       .scanline_rgb = 1024,
> >>>         .ccsc = CCSC_MIXER0_LAYOUT,
> >>>         .mod_rate = 150000000,
> >>>  };
> >>> @@ -620,6 +626,7 @@ static const struct sun8i_mixer_cfg
> >>> sun20i_d1_mixer0_cfg
> >>> = { .mod_rate   = 297000000,
> >>>         .scaler_mask    = 0x3,
> >>>         .scanline_yuv   = 2048,
> >>> +       .scanline_rgb   = 2048,
> >>>         .ui_num         = 1,
> >>>         .vi_num         = 1,
> >>>  };
> >>> @@ -629,6 +636,7 @@ static const struct sun8i_mixer_cfg
> >>> sun20i_d1_mixer1_cfg
> >>> = { .mod_rate   = 297000000,
> >>>         .scaler_mask    = 0x1,
> >>>         .scanline_yuv   = 1024,
> >>> +       .scanline_rgb   = 1024,
> >>>         .ui_num         = 0,
> >>>         .vi_num         = 1,
> >>>  };
> >>> @@ -638,6 +646,7 @@ static const struct sun8i_mixer_cfg
> >>> sun50i_a64_mixer0_cfg = { .mod_rate     = 297000000,
> >>>         .scaler_mask    = 0xf,
> >>>         .scanline_yuv   = 4096,
> >>> +       .scanline_rgb   = 2048,
> >>>         .ui_num         = 3,
> >>>         .vi_num         = 1,
> >>>  };
> >>> @@ -647,6 +656,7 @@ static const struct sun8i_mixer_cfg
> >>> sun50i_a64_mixer1_cfg = { .mod_rate     = 297000000,
> >>>         .scaler_mask    = 0x3,
> >>>         .scanline_yuv   = 2048,
> >>> +       .scanline_rgb   = 2048,
> >>>         .ui_num         = 1,
> >>>         .vi_num         = 1,
> >>>  };
> >>> @@ -657,6 +667,7 @@ static const struct sun8i_mixer_cfg
> >>> sun50i_h6_mixer0_cfg
> >>> = { .mod_rate   = 600000000,
> >>>         .scaler_mask    = 0xf,
> >>>         .scanline_yuv   = 4096,
> >>> +       .scanline_rgb   = 2048,
> >>>         .ui_num         = 3,
> >>>         .vi_num         = 1,
> >>>  };
> >>> diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.h
> >>> b/drivers/gpu/drm/sun4i/sun8i_mixer.h index 85c94884f..c01b3e9d6
> >>> 100644
> >>> --- a/drivers/gpu/drm/sun4i/sun8i_mixer.h
> >>> +++ b/drivers/gpu/drm/sun4i/sun8i_mixer.h
> >>> @@ -172,6 +172,7 @@ struct sun8i_mixer_cfg {
> >>>         unsigned long   mod_rate;
> >>>         unsigned int    is_de3 : 1;
> >>>         unsigned int    scanline_yuv;
> >>> +       unsigned int    scanline_rgb;
> >>
> >> This quirk needs to be documented above in the comment.
> >>
> >> Best regards,
> >> Jernej
> >>
> >>>  };
> >>>
> >>>  struct sun8i_mixer {
> >>> diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> >>> b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c index f7d0b082d..30e6bde92
> >>> 100644
> >>> --- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> >>> +++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
> >>> @@ -188,8 +188,7 @@ static int sun8i_vi_layer_update_coord(struct
> >>> sun8i_mixer *mixer, int channel, src_h = vn;
> >>>                 }
> >>>
> >>> -               /* it seems that every RGB scaler has buffer for
> >>> 2048 
> >> pixels */
> >>> -               scanline = subsampled ? mixer->cfg->scanline_yuv : 
> >> 2048;
> >>> +               scanline = subsampled ? mixer->cfg->scanline_yuv :
> >>> mixer->cfg->scanline_rgb;
> >>>
> >>>                 if (src_w > scanline) {
> >>>                         DRM_DEBUG_DRIVER("Using horizontal coarse 
> >> scaling\n");
> >>
> >>
> >>
> >>
> >>
> > 
> > 
> 
>