[PATCH v5 24/69] drm/vc4: dpi: Embed DRM structures into the private structure

[Maxime Ripard]

The VC4 DPI driver private structure contains only a pointer to the
encoder it implements. This makes the overall structure somewhat
inconsistent with the rest of the driver, and complicates its
initialisation without any apparent gain.

Let's embed the drm_encoder structure (through the vc4_encoder one) into
struct vc4_dpi to fix both issues.

Acked-by: Thomas Zimmermann <tzimmermann at suse.de>
Reviewed-by: Dave Stevenson <dave.stevenson at raspberrypi.com>
Signed-off-by: Maxime Ripard <maxime at cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_dpi.c | 49 ++++++++++++-----------------------
 1 file changed, 16 insertions(+), 33 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_dpi.c b/drivers/gpu/drm/vc4/vc4_dpi.c
index d3625dcb5dcb..7c4bfbd7ed9f 100644
--- a/drivers/gpu/drm/vc4/vc4_dpi.c
+++ b/drivers/gpu/drm/vc4/vc4_dpi.c
@@ -84,10 +84,10 @@
 
 /* General DPI hardware state. */
 struct vc4_dpi {
+	struct vc4_encoder encoder;
+
 	struct platform_device *pdev;
 
-	struct drm_encoder *encoder;
-
 	void __iomem *regs;
 
 	struct clk *pixel_clock;
@@ -96,21 +96,15 @@ struct vc4_dpi {
 	struct debugfs_regset32 regset;
 };
 
+static inline struct vc4_dpi *
+to_vc4_dpi(struct drm_encoder *encoder)
+{
+	return container_of(encoder, struct vc4_dpi, encoder.base);
+}
+
 #define DPI_READ(offset) readl(dpi->regs + (offset))
 #define DPI_WRITE(offset, val) writel(val, dpi->regs + (offset))
 
-/* VC4 DPI encoder KMS struct */
-struct vc4_dpi_encoder {
-	struct vc4_encoder base;
-	struct vc4_dpi *dpi;
-};
-
-static inline struct vc4_dpi_encoder *
-to_vc4_dpi_encoder(struct drm_encoder *encoder)
-{
-	return container_of(encoder, struct vc4_dpi_encoder, base.base);
-}
-
 static const struct debugfs_reg32 dpi_regs[] = {
 	VC4_REG32(DPI_C),
 	VC4_REG32(DPI_ID),
@@ -118,8 +112,7 @@ static const struct debugfs_reg32 dpi_regs[] = {
 
 static void vc4_dpi_encoder_disable(struct drm_encoder *encoder)
 {
-	struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
-	struct vc4_dpi *dpi = vc4_encoder->dpi;
+	struct vc4_dpi *dpi = to_vc4_dpi(encoder);
 
 	clk_disable_unprepare(dpi->pixel_clock);
 }
@@ -128,8 +121,7 @@ static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
 {
 	struct drm_device *dev = encoder->dev;
 	struct drm_display_mode *mode = &encoder->crtc->mode;
-	struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
-	struct vc4_dpi *dpi = vc4_encoder->dpi;
+	struct vc4_dpi *dpi = to_vc4_dpi(encoder);
 	struct drm_connector_list_iter conn_iter;
 	struct drm_connector *connector = NULL, *connector_scan;
 	u32 dpi_c = DPI_ENABLE;
@@ -262,7 +254,7 @@ static int vc4_dpi_init_bridge(struct vc4_dpi *dpi)
 			return PTR_ERR(bridge);
 	}
 
-	return drm_bridge_attach(dpi->encoder, bridge, NULL, 0);
+	return drm_bridge_attach(&dpi->encoder.base, bridge, NULL, 0);
 }
 
 static int vc4_dpi_bind(struct device *dev, struct device *master, void *data)
@@ -270,21 +262,12 @@ static int vc4_dpi_bind(struct device *dev, struct device *master, void *data)
 	struct platform_device *pdev = to_platform_device(dev);
 	struct drm_device *drm = dev_get_drvdata(master);
 	struct vc4_dpi *dpi;
-	struct vc4_dpi_encoder *vc4_dpi_encoder;
 	int ret;
 
 	dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
 	if (!dpi)
 		return -ENOMEM;
-
-	vc4_dpi_encoder = devm_kzalloc(dev, sizeof(*vc4_dpi_encoder),
-				       GFP_KERNEL);
-	if (!vc4_dpi_encoder)
-		return -ENOMEM;
-	vc4_dpi_encoder->base.type = VC4_ENCODER_TYPE_DPI;
-	vc4_dpi_encoder->dpi = dpi;
-	dpi->encoder = &vc4_dpi_encoder->base.base;
-
+	dpi->encoder.type = VC4_ENCODER_TYPE_DPI;
 	dpi->pdev = pdev;
 	dpi->regs = vc4_ioremap_regs(pdev, 0);
 	if (IS_ERR(dpi->regs))
@@ -318,8 +301,8 @@ static int vc4_dpi_bind(struct device *dev, struct device *master, void *data)
 	if (ret)
 		DRM_ERROR("Failed to turn on core clock: %d\n", ret);
 
-	drm_simple_encoder_init(drm, dpi->encoder, DRM_MODE_ENCODER_DPI);
-	drm_encoder_helper_add(dpi->encoder, &vc4_dpi_encoder_helper_funcs);
+	drm_simple_encoder_init(drm, &dpi->encoder.base, DRM_MODE_ENCODER_DPI);
+	drm_encoder_helper_add(&dpi->encoder.base, &vc4_dpi_encoder_helper_funcs);
 
 	ret = vc4_dpi_init_bridge(dpi);
 	if (ret)
@@ -332,7 +315,7 @@ static int vc4_dpi_bind(struct device *dev, struct device *master, void *data)
 	return 0;
 
 err_destroy_encoder:
-	drm_encoder_cleanup(dpi->encoder);
+	drm_encoder_cleanup(&dpi->encoder.base);
 	clk_disable_unprepare(dpi->core_clock);
 	return ret;
 }
@@ -344,7 +327,7 @@ static void vc4_dpi_unbind(struct device *dev, struct device *master,
 
 	drm_of_panel_bridge_remove(dev->of_node, 0, 0);
 
-	drm_encoder_cleanup(dpi->encoder);
+	drm_encoder_cleanup(&dpi->encoder.base);
 
 	clk_disable_unprepare(dpi->core_clock);
 }
-- 
2.36.1