drm/vc4: hdmi: Add container_of macros for encoders and connectors

Whenever the code needs to access the vc4_hdmi structure from a DRM
connector or encoder, it first accesses the drm_device associated to the
connector, then retrieve the drm_dev private data which gives it a
pointer to our vc4_dev, and will finally follow the vc4_hdmi pointer in
that structure.

That will also give us some trouble when having multiple controllers,
but now that we have our encoder and connector structures that are part
of vc4_hdmi, we can simply call container_of on the DRM connector or
encoder and retrieve the vc4_hdmi structure directly.
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Tested-by: Chanwoo Choi <cw00.choi@samsung.com>
Tested-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/536ecce5898ea75839fa3788b876009d69a5ccae.1599120059.git-series.maxime@cerno.tech

drivers/gpu/drm/vc4/vc4_hdmi.c

@@ -121,9 +121,7 @@ static int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused)
 static enum drm_connector_status
 vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
 {
-	struct drm_device *dev = connector->dev;
-	struct vc4_dev *vc4 = to_vc4_dev(dev);
-	struct vc4_hdmi *vc4_hdmi = vc4->hdmi;
+	struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
 
 	if (vc4_hdmi->hpd_gpio) {
 		if (gpio_get_value_cansleep(vc4_hdmi->hpd_gpio) ^
@@ -150,17 +148,13 @@ static void vc4_hdmi_connector_destroy(struct drm_connector *connector)
 
 static int vc4_hdmi_connector_get_modes(struct drm_connector *connector)
 {
-	struct vc4_hdmi_connector *vc4_connector =
-		to_vc4_hdmi_connector(connector);
-	struct drm_encoder *encoder = vc4_connector->encoder;
-	struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
-	struct drm_device *dev = connector->dev;
-	struct vc4_dev *vc4 = to_vc4_dev(dev);
+	struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
+	struct vc4_hdmi_encoder *vc4_encoder = &vc4_hdmi->encoder;
 	int ret = 0;
 	struct edid *edid;
 
-	edid = drm_get_edid(connector, vc4->hdmi->ddc);
-	cec_s_phys_addr_from_edid(vc4->hdmi->cec_adap, edid);
+	edid = drm_get_edid(connector, vc4_hdmi->ddc);
+	cec_s_phys_addr_from_edid(vc4_hdmi->cec_adap, edid);
 	if (!edid)
 		return -ENODEV;
 
@@ -229,9 +223,7 @@ static int vc4_hdmi_connector_init(struct drm_device *dev,
 static int vc4_hdmi_stop_packet(struct drm_encoder *encoder,
 				enum hdmi_infoframe_type type)
 {
-	struct drm_device *dev = encoder->dev;
-	struct vc4_dev *vc4 = to_vc4_dev(dev);
-	struct vc4_hdmi *vc4_hdmi = vc4->hdmi;
+	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 	u32 packet_id = type - 0x80;
 
 	HDMI_WRITE(VC4_HDMI_RAM_PACKET_CONFIG,
@@ -244,9 +236,7 @@ static int vc4_hdmi_stop_packet(struct drm_encoder *encoder,
 static void vc4_hdmi_write_infoframe(struct drm_encoder *encoder,
 				     union hdmi_infoframe *frame)
 {
-	struct drm_device *dev = encoder->dev;
-	struct vc4_dev *vc4 = to_vc4_dev(dev);
-	struct vc4_hdmi *vc4_hdmi = vc4->hdmi;
+	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 	u32 packet_id = frame->any.type - 0x80;
 	u32 packet_reg = VC4_HDMI_RAM_PACKET(packet_id);
 	uint8_t buffer[VC4_HDMI_PACKET_STRIDE];
@@ -292,9 +282,8 @@ static void vc4_hdmi_write_infoframe(struct drm_encoder *encoder,
 
 static void vc4_hdmi_set_avi_infoframe(struct drm_encoder *encoder)
 {
+	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 	struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
-	struct vc4_dev *vc4 = encoder->dev->dev_private;
-	struct vc4_hdmi *vc4_hdmi = vc4->hdmi;
 	struct drm_connector *connector = &vc4_hdmi->connector.base;
 	struct drm_connector_state *cstate = connector->state;
 	struct drm_crtc *crtc = encoder->crtc;
@@ -338,9 +327,7 @@ static void vc4_hdmi_set_spd_infoframe(struct drm_encoder *encoder)
 
 static void vc4_hdmi_set_audio_infoframe(struct drm_encoder *encoder)
 {
-	struct drm_device *drm = encoder->dev;
-	struct vc4_dev *vc4 = drm->dev_private;
-	struct vc4_hdmi *vc4_hdmi = vc4->hdmi;
+	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 	union hdmi_infoframe frame;
 	int ret;
 
@@ -362,9 +349,7 @@ static void vc4_hdmi_set_infoframes(struct drm_encoder *encoder)
 
 static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
 {
-	struct drm_device *dev = encoder->dev;
-	struct vc4_dev *vc4 = to_vc4_dev(dev);
-	struct vc4_hdmi *vc4_hdmi = vc4->hdmi;
+	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
 	int ret;
 
 	HDMI_WRITE(VC4_HDMI_RAM_PACKET_CONFIG, 0);
@@ -383,10 +368,8 @@ static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder)
 static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder)
 {
 	struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
-	struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
-	struct drm_device *dev = encoder->dev;
-	struct vc4_dev *vc4 = to_vc4_dev(dev);
-	struct vc4_hdmi *vc4_hdmi = vc4->hdmi;
+	struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
+	struct vc4_hdmi_encoder *vc4_encoder = &vc4_hdmi->encoder;
 	bool debug_dump_regs = false;
 	bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC;
 	bool vsync_pos = mode->flags & DRM_MODE_FLAG_PVSYNC;

drivers/gpu/drm/vc4/vc4_hdmi.h

@@ -78,6 +78,22 @@ struct vc4_hdmi {
 	struct debugfs_regset32 hd_regset;
 };
 
+static inline struct vc4_hdmi *
+connector_to_vc4_hdmi(struct drm_connector *connector)
+{
+	struct vc4_hdmi_connector *_connector = to_vc4_hdmi_connector(connector);
+
+	return container_of(_connector, struct vc4_hdmi, connector);
+}
+
+static inline struct vc4_hdmi *
+encoder_to_vc4_hdmi(struct drm_encoder *encoder)
+{
+	struct vc4_hdmi_encoder *_encoder = to_vc4_hdmi_encoder(encoder);
+
+	return container_of(_encoder, struct vc4_hdmi, encoder);
+}
+
 #define HDMI_READ(offset) readl(vc4_hdmi->hdmicore_regs + offset)
 #define HDMI_WRITE(offset, val) writel(val, vc4_hdmi->hdmicore_regs + offset)
 #define HD_READ(offset) readl(vc4_hdmi->hd_regs + offset)