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

Icenowy Zheng
2017-05-05T12:39:31Z

? 2017?5?5? GMT+08:00 ??8:36:18, Maxime Ripard <maxime.ripard@free-electrons.com> ??:
>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.

Are they these two lines:
```
paddr += (state->src_x >> 16) * bpp;
paddr += (state->src_y >> 16) * fb->pitches[0];
```

I think I copied them here, so I don't need to mind this problem any more, right?

>
>Maxime