Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   roman.stratiienko@globallogic.com
To:     mripard@kernel.org, dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        jernej.skrabec@siol.net
Cc:     Roman Stratiienko <roman.stratiienko@globallogic.com>
Subject: [PATCH v3 2/2] drm/sun4i: Add alpha property for sun8i and sun50i VI layer
Date:   Fri,  3 Jan 2020 23:19:01 +0200
Message-Id: <20200103211901.44201-2-roman.stratiienko@globallogic.com>
In-Reply-To: <20200103211901.44201-1-roman.stratiienko@globallogic.com>
References: <20200103211901.44201-1-roman.stratiienko@globallogic.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Roman Stratiienko <roman.stratiienko@globallogic.com>

DE3.0 VI layers supports plane-global alpha channel.
DE2.0 FCC block have GLOBAL_ALPHA register that can be used as alpha source
for blender.

Add alpha property to the DRM plane and connect it to the
corresponding registers in the mixer.

Do not add alpha property for systems with DE2.0 and more than 1 VI planes.

Signed-off-by: Roman Stratiienko <roman.stratiienko@globallogic.com>
---
v2: Initial version by mistake
v3:
- Skip adding & applying alpha property if VI count > 1
---
 drivers/gpu/drm/sun4i/sun8i_vi_layer.c | 48 +++++++++++++++++++++-----
 drivers/gpu/drm/sun4i/sun8i_vi_layer.h | 11 ++++++
 2 files changed, 51 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
index 42d445d23773..e61aec7d6d07 100644
--- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.c
@@ -65,6 +65,36 @@ static void sun8i_vi_layer_enable(struct sun8i_mixer *mixer, int channel,
 	}
 }
 
+static void sun8i_vi_layer_update_alpha(struct sun8i_mixer *mixer, int channel,
+					int overlay, struct drm_plane *plane)
+{
+	u32 mask, val, ch_base;
+
+	ch_base = sun8i_channel_base(mixer, channel);
+
+	if (mixer->cfg->is_de3) {
+		mask = SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MASK |
+		       SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_MASK;
+		val = SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA
+			(plane->state->alpha >> 8);
+
+		val |= (plane->state->alpha == DRM_BLEND_ALPHA_OPAQUE) ?
+			SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_PIXEL :
+			SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_COMBINED;
+
+		regmap_update_bits(mixer->engine.regs,
+				   SUN8I_MIXER_CHAN_VI_LAYER_ATTR(ch_base,
+								  overlay),
+				   mask, val);
+	} else if (mixer->cfg->vi_num == 1) {
+		regmap_update_bits(mixer->engine.regs,
+				   SUN8I_MIXER_FCC_GLOBAL_ALPHA_REG,
+				   SUN8I_MIXER_FCC_GLOBAL_ALPHA_MASK,
+				   SUN8I_MIXER_FCC_GLOBAL_ALPHA
+					(plane->state->alpha >> 8));
+	}
+}
+
 static int sun8i_vi_layer_update_coord(struct sun8i_mixer *mixer, int channel,
 				       int overlay, struct drm_plane *plane,
 				       unsigned int zpos)
@@ -248,14 +278,6 @@ static int sun8i_vi_layer_update_formats(struct sun8i_mixer *mixer, int channel,
 			   SUN8I_MIXER_CHAN_VI_LAYER_ATTR(ch_base, overlay),
 			   SUN8I_MIXER_CHAN_VI_LAYER_ATTR_RGB_MODE, val);
 
-	/* It seems that YUV formats use global alpha setting. */
-	if (mixer->cfg->is_de3)
-		regmap_update_bits(mixer->engine.regs,
-				   SUN8I_MIXER_CHAN_VI_LAYER_ATTR(ch_base,
-								  overlay),
-				   SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MASK,
-				   SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA(0xff));
-
 	return 0;
 }
 
@@ -373,6 +395,8 @@ static void sun8i_vi_layer_atomic_update(struct drm_plane *plane,
 
 	sun8i_vi_layer_update_coord(mixer, layer->channel,
 				    layer->overlay, plane, zpos);
+	sun8i_vi_layer_update_alpha(mixer, layer->channel,
+				    layer->overlay, plane);
 	sun8i_vi_layer_update_formats(mixer, layer->channel,
 				      layer->overlay, plane);
 	sun8i_vi_layer_update_buffer(mixer, layer->channel,
@@ -464,6 +488,14 @@ struct sun8i_vi_layer *sun8i_vi_layer_init_one(struct drm_device *drm,
 
 	plane_cnt = mixer->cfg->ui_num + mixer->cfg->vi_num;
 
+	if (mixer->cfg->vi_num == 1 || mixer->cfg->is_de3) {
+		ret = drm_plane_create_alpha_property(&layer->plane);
+		if (ret) {
+			dev_err(drm->dev, "Couldn't add alpha property\n");
+			return ERR_PTR(ret);
+		}
+	}
+
 	ret = drm_plane_create_zpos_property(&layer->plane, index,
 					     0, plane_cnt - 1);
 	if (ret) {
diff --git a/drivers/gpu/drm/sun4i/sun8i_vi_layer.h b/drivers/gpu/drm/sun4i/sun8i_vi_layer.h
index eaa6076f5dbc..48c399e1c86d 100644
--- a/drivers/gpu/drm/sun4i/sun8i_vi_layer.h
+++ b/drivers/gpu/drm/sun4i/sun8i_vi_layer.h
@@ -29,14 +29,25 @@
 #define SUN8I_MIXER_CHAN_VI_VDS_UV(base) \
 		((base) + 0xfc)
 
+#define SUN8I_MIXER_FCC_GLOBAL_ALPHA_REG \
+		(0xAA000 + 0x90)
+
+#define SUN8I_MIXER_FCC_GLOBAL_ALPHA(x)			((x) << 24)
+#define SUN8I_MIXER_FCC_GLOBAL_ALPHA_MASK		GENMASK(31, 24)
+
 #define SUN8I_MIXER_CHAN_VI_LAYER_ATTR_EN		BIT(0)
 /* RGB mode should be set for RGB formats and cleared for YCbCr */
 #define SUN8I_MIXER_CHAN_VI_LAYER_ATTR_RGB_MODE		BIT(15)
 #define SUN8I_MIXER_CHAN_VI_LAYER_ATTR_FBFMT_OFFSET	8
 #define SUN8I_MIXER_CHAN_VI_LAYER_ATTR_FBFMT_MASK	GENMASK(12, 8)
+#define SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_MASK	GENMASK(2, 1)
 #define SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MASK	GENMASK(31, 24)
 #define SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA(x)	((x) << 24)
 
+#define SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_PIXEL	((0) << 1)
+#define SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_LAYER	((1) << 1)
+#define SUN50I_MIXER_CHAN_VI_LAYER_ATTR_ALPHA_MODE_COMBINED	((2) << 1)
+
 #define SUN8I_MIXER_CHAN_VI_DS_N(x)			((x) << 16)
 #define SUN8I_MIXER_CHAN_VI_DS_M(x)			((x) << 0)
 
-- 
2.17.1