media: sun6i-csi: Tidy capture configure code

Some misc code cleanups and preparation for upcoming changes.
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/sunxi/sun6i-csi/sun6i_csi_capture.c

@@ -353,133 +353,120 @@ static enum csi_input_seq get_csi_input_seq(struct sun6i_csi_device *csi_dev,
 static void
 sun6i_csi_capture_configure_interface(struct sun6i_csi_device *csi_dev)
 {
+	struct device *dev = csi_dev->dev;
+	struct regmap *regmap = csi_dev->regmap;
 	struct v4l2_fwnode_endpoint *endpoint =
 		&csi_dev->bridge.source_parallel.endpoint;
+	unsigned char bus_width = endpoint->bus.parallel.bus_width;
+	unsigned int flags = endpoint->bus.parallel.flags;
 	u32 pixelformat, field;
-	unsigned char bus_width;
-	u32 flags;
-	u32 cfg = 0;
-	bool input_interlaced = false;
+	u32 value = SUN6I_CSI_IF_CFG_IF_CSI;
 
 	sun6i_csi_capture_format(csi_dev, &pixelformat, &field);
 
 	if (field == V4L2_FIELD_INTERLACED ||
 	    field == V4L2_FIELD_INTERLACED_TB ||
 	    field == V4L2_FIELD_INTERLACED_BT)
-		input_interlaced = true;
-
-	bus_width = endpoint->bus.parallel.bus_width;
-
-	if (input_interlaced)
-		cfg |= SUN6I_CSI_IF_CFG_SRC_TYPE_INTERLACED |
-		       SUN6I_CSI_IF_CFG_FIELD_DT_PCLK_SHIFT(1) |
-		       SUN6I_CSI_IF_CFG_FIELD_DT_FIELD_VSYNC;
+		value |= SUN6I_CSI_IF_CFG_SRC_TYPE_INTERLACED |
+			 SUN6I_CSI_IF_CFG_FIELD_DT_PCLK_SHIFT(1) |
+			 SUN6I_CSI_IF_CFG_FIELD_DT_FIELD_VSYNC;
 	else
-		cfg |= SUN6I_CSI_IF_CFG_SRC_TYPE_PROGRESSIVE;
+		value |= SUN6I_CSI_IF_CFG_SRC_TYPE_PROGRESSIVE;
 
 	switch (endpoint->bus_type) {
 	case V4L2_MBUS_PARALLEL:
-		cfg |= SUN6I_CSI_IF_CFG_IF_CSI;
-
-		flags = endpoint->bus.parallel.flags;
-
 		if (bus_width == 16)
-			cfg |= SUN6I_CSI_IF_CFG_IF_CSI_YUV_COMBINED;
+			value |= SUN6I_CSI_IF_CFG_IF_CSI_YUV_COMBINED;
 		else
-			cfg |= SUN6I_CSI_IF_CFG_IF_CSI_YUV_RAW;
+			value |= SUN6I_CSI_IF_CFG_IF_CSI_YUV_RAW;
 
 		if (flags & V4L2_MBUS_FIELD_EVEN_LOW)
-			cfg |= SUN6I_CSI_IF_CFG_FIELD_NEGATIVE;
+			value |= SUN6I_CSI_IF_CFG_FIELD_NEGATIVE;
 		else
-			cfg |= SUN6I_CSI_IF_CFG_FIELD_POSITIVE;
+			value |= SUN6I_CSI_IF_CFG_FIELD_POSITIVE;
 
 		if (flags & V4L2_MBUS_VSYNC_ACTIVE_LOW)
-			cfg |= SUN6I_CSI_IF_CFG_VREF_POL_NEGATIVE;
+			value |= SUN6I_CSI_IF_CFG_VREF_POL_NEGATIVE;
 		else
-			cfg |= SUN6I_CSI_IF_CFG_VREF_POL_POSITIVE;
+			value |= SUN6I_CSI_IF_CFG_VREF_POL_POSITIVE;
 
 		if (flags & V4L2_MBUS_HSYNC_ACTIVE_LOW)
-			cfg |= SUN6I_CSI_IF_CFG_HREF_POL_NEGATIVE;
+			value |= SUN6I_CSI_IF_CFG_HREF_POL_NEGATIVE;
 		else
-			cfg |= SUN6I_CSI_IF_CFG_HREF_POL_POSITIVE;
+			value |= SUN6I_CSI_IF_CFG_HREF_POL_POSITIVE;
 
 		if (flags & V4L2_MBUS_PCLK_SAMPLE_RISING)
-			cfg |= SUN6I_CSI_IF_CFG_CLK_POL_RISING;
+			value |= SUN6I_CSI_IF_CFG_CLK_POL_RISING;
 		else
-			cfg |= SUN6I_CSI_IF_CFG_CLK_POL_FALLING;
+			value |= SUN6I_CSI_IF_CFG_CLK_POL_FALLING;
 		break;
 	case V4L2_MBUS_BT656:
-		cfg |= SUN6I_CSI_IF_CFG_IF_CSI;
-
-		flags = endpoint->bus.parallel.flags;
-
 		if (bus_width == 16)
-			cfg |= SUN6I_CSI_IF_CFG_IF_CSI_BT1120;
+			value |= SUN6I_CSI_IF_CFG_IF_CSI_BT1120;
 		else
-			cfg |= SUN6I_CSI_IF_CFG_IF_CSI_BT656;
+			value |= SUN6I_CSI_IF_CFG_IF_CSI_BT656;
 
 		if (flags & V4L2_MBUS_FIELD_EVEN_LOW)
-			cfg |= SUN6I_CSI_IF_CFG_FIELD_NEGATIVE;
+			value |= SUN6I_CSI_IF_CFG_FIELD_NEGATIVE;
 		else
-			cfg |= SUN6I_CSI_IF_CFG_FIELD_POSITIVE;
+			value |= SUN6I_CSI_IF_CFG_FIELD_POSITIVE;
 
 		if (flags & V4L2_MBUS_PCLK_SAMPLE_FALLING)
-			cfg |= SUN6I_CSI_IF_CFG_CLK_POL_RISING;
+			value |= SUN6I_CSI_IF_CFG_CLK_POL_RISING;
 		else
-			cfg |= SUN6I_CSI_IF_CFG_CLK_POL_FALLING;
+			value |= SUN6I_CSI_IF_CFG_CLK_POL_FALLING;
 		break;
 	default:
-		dev_warn(csi_dev->dev, "Unsupported bus type: %d\n",
-			 endpoint->bus_type);
+		dev_warn(dev, "unsupported bus type: %d\n", endpoint->bus_type);
 		break;
 	}
 
 	switch (bus_width) {
 	case 8:
-		cfg |= SUN6I_CSI_IF_CFG_DATA_WIDTH_8;
+	/* 16-bit YUV formats use a doubled width in 8-bit mode. */
+	case 16:
+		value |= SUN6I_CSI_IF_CFG_DATA_WIDTH_8;
 		break;
 	case 10:
-		cfg |= SUN6I_CSI_IF_CFG_DATA_WIDTH_10;
+		value |= SUN6I_CSI_IF_CFG_DATA_WIDTH_10;
 		break;
 	case 12:
-		cfg |= SUN6I_CSI_IF_CFG_DATA_WIDTH_12;
-		break;
-	case 16: /* No need to configure DATA_WIDTH for 16bit */
+		value |= SUN6I_CSI_IF_CFG_DATA_WIDTH_12;
 		break;
 	default:
-		dev_warn(csi_dev->dev, "Unsupported bus width: %u\n", bus_width);
+		dev_warn(dev, "unsupported bus width: %u\n", bus_width);
 		break;
 	}
 
-	regmap_write(csi_dev->regmap, SUN6I_CSI_IF_CFG_REG, cfg);
+	regmap_write(regmap, SUN6I_CSI_IF_CFG_REG, value);
 }
 
 static void sun6i_csi_capture_configure_format(struct sun6i_csi_device *csi_dev)
 {
+	struct regmap *regmap = csi_dev->regmap;
 	u32 mbus_code, pixelformat, field;
-	u32 cfg = 0;
-	u32 val;
+	u8 input_format, input_yuv_seq, output_format;
+	u32 value = 0;
 
 	sun6i_csi_capture_format(csi_dev, &pixelformat, &field);
 	sun6i_csi_bridge_format(csi_dev, &mbus_code, NULL);
 
-	val = get_csi_input_format(csi_dev, mbus_code, pixelformat);
-	cfg |= SUN6I_CSI_CH_CFG_INPUT_FMT(val);
-
-	val = get_csi_output_format(csi_dev, pixelformat, field);
-	cfg |= SUN6I_CSI_CH_CFG_OUTPUT_FMT(val);
+	input_format = get_csi_input_format(csi_dev, mbus_code, pixelformat);
+	input_yuv_seq = get_csi_input_seq(csi_dev, mbus_code, pixelformat);
+	output_format = get_csi_output_format(csi_dev, pixelformat, field);
 
-	val = get_csi_input_seq(csi_dev, mbus_code, pixelformat);
-	cfg |= SUN6I_CSI_CH_CFG_INPUT_YUV_SEQ(val);
+	value |= SUN6I_CSI_CH_CFG_OUTPUT_FMT(output_format);
+	value |= SUN6I_CSI_CH_CFG_INPUT_FMT(input_format);
+	value |= SUN6I_CSI_CH_CFG_INPUT_YUV_SEQ(input_yuv_seq);
 
 	if (field == V4L2_FIELD_TOP)
-		cfg |= SUN6I_CSI_CH_CFG_FIELD_SEL_FIELD0;
+		value |= SUN6I_CSI_CH_CFG_FIELD_SEL_FIELD0;
 	else if (field == V4L2_FIELD_BOTTOM)
-		cfg |= SUN6I_CSI_CH_CFG_FIELD_SEL_FIELD1;
+		value |= SUN6I_CSI_CH_CFG_FIELD_SEL_FIELD1;
 	else
-		cfg |= SUN6I_CSI_CH_CFG_FIELD_SEL_EITHER;
+		value |= SUN6I_CSI_CH_CFG_FIELD_SEL_EITHER;
 
-	regmap_write(csi_dev->regmap, SUN6I_CSI_CH_CFG_REG, cfg);
+	regmap_write(regmap, SUN6I_CSI_CH_CFG_REG, value);
 }
 
 static void sun6i_csi_capture_configure_window(struct sun6i_csi_device *csi_dev)