[PATCH 2/2] staging: media: imx: imx7-mipi-csic: Set PIXEL_MODE for YUV422

[Jacopo Mondi <jacopo@jmondi.org>]

Bits 13 and 12 of the ISP_CONFIGn register configure the PIXEL_MODE
which specifies the sampling size, in pixel component units, on the
CSI-2 output data interface when data are transferred to memory.

The register description in the chip manual specifies that DUAL mode
should be used for YUV422 data but does not clarify the reason.

Todo: verify if other YUV formats require the same setting and what is the
appropriate setting for RAW and sRGB formats.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
---
 drivers/staging/media/imx/imx7-mipi-csis.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
index cb54bb7491d9..e96989c46479 100644
--- a/drivers/staging/media/imx/imx7-mipi-csis.c
+++ b/drivers/staging/media/imx/imx7-mipi-csis.c
@@ -499,6 +499,10 @@ static void __mipi_csis_set_format(struct csi_state *state)
 	/* Color format */
 	val = mipi_csis_read(state, MIPI_CSIS_ISP_CONFIG_CH(0));
 	val &= ~(MIPI_CSIS_ISPCFG_ALIGN_32BIT | MIPI_CSIS_ISPCFG_FMT_MASK);
+
+	if (state->csis_fmt->data_type == MIPI_CSI2_DATA_TYPE_YUV422_8)
+		val |= MIPI_CSIS_ISPCFG_PIXEL_MODE_DUAL;
+
 	val |= MIPI_CSIS_ISPCFG_FMT(state->csis_fmt->data_type);
 	mipi_csis_write(state, MIPI_CSIS_ISP_CONFIG_CH(0), val);
 
-- 
2.34.1