linux-kernel - Re: [PATCH 13/17] drm/sun4i: Add DE2 CSC library

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Message-ID: <5439299.3c0LKkSZrY@jernej-laptop>
Date:   Tue, 28 Nov 2017 22:43:39 +0100
From:   Jernej Škrabec <jernej.skrabec@...l.net>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     wens@...e.org, airlied@...ux.ie, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, icenowy@...c.io,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH 13/17] drm/sun4i: Add DE2 CSC library

Hi!

Dne torek, 28. november 2017 ob 21:55:50 CET je Maxime Ripard napisal(a):
> On Mon, Nov 27, 2017 at 09:57:46PM +0100, Jernej Skrabec wrote:
> > DE2 have many CSC units - channel input CSC, channel output CSC and
> > mixer output CSC and maybe more.
> > 
> > Fortunately, they have all same register layout, only base offsets
> > differs.
> > 
> > Add support only for channel output CSC for now.
> > 
> > Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
> > ---
> > 
> >  drivers/gpu/drm/sun4i/Makefile    |  2 +-
> >  drivers/gpu/drm/sun4i/sun8i_csc.c | 90
> >  +++++++++++++++++++++++++++++++++++++++
> >  drivers/gpu/drm/sun4i/sun8i_csc.h | 36 ++++++++++++++++
> >  3 files changed, 127 insertions(+), 1 deletion(-)
> >  create mode 100644 drivers/gpu/drm/sun4i/sun8i_csc.c
> >  create mode 100644 drivers/gpu/drm/sun4i/sun8i_csc.h
> > 
> > diff --git a/drivers/gpu/drm/sun4i/Makefile
> > b/drivers/gpu/drm/sun4i/Makefile index 70df480792f9..f82cc69ede72 100644
> > --- a/drivers/gpu/drm/sun4i/Makefile
> > +++ b/drivers/gpu/drm/sun4i/Makefile
> > @@ -9,7 +9,7 @@ sun4i-drm-hdmi-y		+= sun4i_hdmi_enc.o
> > 
> >  sun4i-drm-hdmi-y		+= sun4i_hdmi_i2c.o
> >  sun4i-drm-hdmi-y		+= sun4i_hdmi_tmds_clk.o
> > 
> > -sun8i-mixer-y			+= sun8i_mixer.o sun8i_layer.o sun8i_scaler.o
> > +sun8i-mixer-y			+= sun8i_mixer.o sun8i_layer.o sun8i_scaler.o 
sun8i_csc.o
> 
> Please wrap that line.
> 
> >  sun4i-tcon-y			+= sun4i_crtc.o
> >  sun4i-tcon-y			+= sun4i_dotclock.o
> > 
> > diff --git a/drivers/gpu/drm/sun4i/sun8i_csc.c
> > b/drivers/gpu/drm/sun4i/sun8i_csc.c new file mode 100644
> > index 000000000000..d48c28f8d568
> > --- /dev/null
> > +++ b/drivers/gpu/drm/sun4i/sun8i_csc.c
> > @@ -0,0 +1,90 @@
> > +/*
> > + * Copyright (C) Jernej Skrabec <jernej.skrabec@...l.net>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License as
> > + * published by the Free Software Foundation; either version 2 of
> > + * the License, or (at your option) any later version.
> > + */
> > +
> > +#include "sun8i_csc.h"
> > +
> > +static const u32 ccsc_base[2][2] = {
> > +	{CCSC00_OFFSET, CCSC01_OFFSET},
> > +	{CCSC10_OFFSET, CCSC11_OFFSET},
> > +};
> > +
> > +/*
> > + * Factors are in two's complement format, 10 bits for fractinal part.
> > + * First tree values in each line are multiplication factor and last
> > + * value is constant, which is added at the end.
> > + */
> > +static const u32 yuv2rgb[] = {
> > +	0x000004A8, 0x00000000, 0x00000662, 0xFFFC845A,
> > +	0x000004A8, 0xFFFFFE6F, 0xFFFFFCBF, 0x00021DF4,
> > +	0x000004A8, 0x00000813, 0x00000000, 0xFFFBAC4A,
> > +};
> > +
> > +static const u32 yvu2rgb[] = {
> > +	0x000004A8, 0x00000662, 0x00000000, 0xFFFC845A,
> > +	0x000004A8, 0xFFFFFCBF, 0xFFFFFE6F, 0x00021DF4,
> > +	0x000004A8, 0x00000000, 0x00000813, 0xFFFBAC4A,
> > +};
> > +
> > +static void sun8i_csc_set_coefficients(struct regmap *map, u32 base,
> > +				       enum sun8i_csc_mode mode)
> > +{
> > +	const u32 *table;
> > +	int i, data;
> > +
> > +	switch (mode) {
> > +	case SUN8I_CSC_MODE_YUV2RGB:
> > +		table = yuv2rgb;
> > +		break;
> > +	case SUN8I_CSC_MODE_YVU2RGB:
> > +		table = yvu2rgb;
> > +		break;
> > +	default:
> > +		WARN(1, "Wrong CSC mode specified.");
> 
> A hard warn is a bit overkill here. What about a dev_warn?

dev_warn requires device, which is not available here and seems a bit overkill 
to have it as parameter just to print warning. What about DRM_WARN()?

Best regards,
Jernej

> 
> Looks good otherwise.
> 
> Thanks!
> Maxime
> 
> --
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com