[PATCH 3/5] rcar-vin: Cache the CSI-2 channel selection value

[Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>]

In preparation of suspend/resume support cache the chsel value when
written to the register so it can be restored on resume if needed.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
 drivers/media/platform/rcar-vin/rcar-dma.c | 2 ++
 drivers/media/platform/rcar-vin/rcar-vin.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c b/drivers/media/platform/rcar-vin/rcar-dma.c
index 680160f9f851d8a3..f65deac4c2dbed54 100644
--- a/drivers/media/platform/rcar-vin/rcar-dma.c
+++ b/drivers/media/platform/rcar-vin/rcar-dma.c
@@ -1456,6 +1456,8 @@ int rvin_set_channel_routing(struct rvin_dev *vin, u8 chsel)
 
 	vin_dbg(vin, "Set IFMD 0x%x\n", ifmd);
 
+	vin->chsel = chsel;
+
 	/* Restore VNMC. */
 	rvin_write(vin, vnmc, VNMC_REG);
 
diff --git a/drivers/media/platform/rcar-vin/rcar-vin.h b/drivers/media/platform/rcar-vin/rcar-vin.h
index 8396e0e45478fe4f..2fef23470e3ddfe3 100644
--- a/drivers/media/platform/rcar-vin/rcar-vin.h
+++ b/drivers/media/platform/rcar-vin/rcar-vin.h
@@ -189,6 +189,7 @@ struct rvin_info {
  * @state:		keeps track of operation state
  *
  * @is_csi:		flag to mark the VIN as using a CSI-2 subdevice
+ * @chsel		Cached value of the current CSI-2 channel selection
  *
  * @mbus_code:		media bus format code
  * @format:		active V4L2 pixel format
@@ -232,6 +233,7 @@ struct rvin_dev {
 	enum rvin_dma_state state;
 
 	bool is_csi;
+	unsigned int chsel;
 
 	u32 mbus_code;
 	struct v4l2_pix_format format;
-- 
2.28.0