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

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Date:   Sun, 22 May 2022 10:36:57 +0200
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     mripard@...nel.org, wens@...e.org, Genfu Pan <benlypan@...il.com>
Cc:     airlied@...ux.ie, daniel@...ll.ch, samuel@...lland.org,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org, Genfu Pan <benlypan@...il.com>
Subject: Re: [PATCH] drm/sun4i: mixer: fix scanline for V3s and D1

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.

> 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@...il.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");