[PATCH v6 08/13] drm/sun4i: add support for Allwinner DE2 mixers

Maxime Ripard
2017-05-05T12:36:18Z

On Fri, May 05, 2017 at 12:50:51AM +0800, icenowy at aosc.io wrote:
> > > +void sun8i_mixer_layer_enable(struct sun8i_mixer *mixer,
> > > + int layer, bool enable)
> > > +{
> > > + u32 val;
> > > + /* Currently the first UI channel is used */
> > > + int chan = mixer->cfg->vi_num;
> > > +
> > > + DRM_DEBUG_DRIVER("Enabling layer %d in channel %d\n", layer, chan);
> > > +
> > > + if (enable)
> > > + val = SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN;
> > > + else
> > > + val = 0;
> > > +
> > > + regmap_update_bits(mixer->engine.regs,
> > > + SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
> > > + SUN8I_MIXER_CHAN_UI_LAYER_ATTR_EN, val);
> > > +
> > > + /* Set the alpha configuration */
> > > + regmap_update_bits(mixer->engine.regs,
> > > + SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
> > > + SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_MASK,
> > > + SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MODE_DEF);
> > > + regmap_update_bits(mixer->engine.regs,
> > > + SUN8I_MIXER_CHAN_UI_LAYER_ATTR(chan, layer),
> > > + SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_MASK,
> > > + SUN8I_MIXER_CHAN_UI_LAYER_ATTR_ALPHA_DEF);
> > > +}
> >
> > This one too.
>
> It's called from sun8i_layer.c, so it cannot be static.

Fair enough.

> > > + /* Set base coordinates */
> > > + DRM_DEBUG_DRIVER("Layer coordinates X: %d Y: %d\n",
> > > + state->crtc_x, state->crtc_y);
> > > + regmap_write(mixer->engine.regs,
> > > + SUN8I_MIXER_CHAN_UI_LAYER_COORD(chan, layer),
> > > + SUN8I_MIXER_COORD(state->crtc_x, state->crtc_y));
> >
> > X and Y are fixed point numbers. You want to keep only the higher 16
> > bits there.
>
> Do you mean "lower 16 bits"? Thus should I (x & 0xffff) or ((u16)x) ?

Nevermind, I got confused with src_x and src_y.

> P.S. The negative coordinates are broken, how should I deal with it? or
> is the coordinates promised to be not negative?

Adjust the buffer base address, and use a shorter line. You have such
an example in the sun4i code.

Maxime

--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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