[PATCH 4/5] media: atmel-isi: setup YCC_SWAP correctly when using preview path

[Josh Wu]

The preview path only can convert UYVY format to RGB data.

To make preview path work correctly, we need to set up YCC_SWAP
according to sensor output and convert them to UYVY.

Signed-off-by: Josh Wu <josh.wu at atmel.com>
---

 drivers/media/platform/soc_camera/atmel-isi.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/media/platform/soc_camera/atmel-isi.c b/drivers/media/platform/soc_camera/atmel-isi.c
index bbf6449..e87d354 100644
--- a/drivers/media/platform/soc_camera/atmel-isi.c
+++ b/drivers/media/platform/soc_camera/atmel-isi.c
@@ -127,6 +127,22 @@ static u32 setup_cfg2_yuv_swap(struct atmel_isi *isi,
 			cfg2_yuv_swap = ISI_CFG2_YCC_SWAP_MODE_1;
 			break;
 		}
+	} else if (xlate->host_fmt->fourcc == V4L2_PIX_FMT_RGB565) {
+		/* Preview path is enabled, it will convert UYVY to RGB format.
+		 * But if sensor output format is not UYVY, we need to set
+		 * YCC_SWAP_MODE to convert it as UYVY.
+		 */
+		switch (xlate->code) {
+		case MEDIA_BUS_FMT_VYUY8_2X8:
+			cfg2_yuv_swap = ISI_CFG2_YCC_SWAP_MODE_1;
+			break;
+		case MEDIA_BUS_FMT_YUYV8_2X8:
+			cfg2_yuv_swap = ISI_CFG2_YCC_SWAP_MODE_2;
+			break;
+		case MEDIA_BUS_FMT_YVYU8_2X8:
+			cfg2_yuv_swap = ISI_CFG2_YCC_SWAP_MODE_3;
+			break;
+		}
 	}
 
 	return cfg2_yuv_swap;
-- 
1.9.1