? 2017?5?5? GMT+08:00 ??8:36:18, Maxime Ripard [off-list ref] ??:

On Fri, May 05, 2017 at 12:50:51AM +0800, icenowy at aosc.io wrote:

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+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);

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+
+	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.

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+	/* 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

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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.

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P.S. The negative coordinates are broken, how should I deal with it?

or

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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