When the adv748x driver is informed about a link being created from HDMI or
AFE to a CSI-2 TX output, the 'link_setup()' callback is invoked. Make
sure to implement proper routing management at link setup time, to route
the selected video stream to the desired TX output.
Signed-off-by: Jacopo Mondi <jacopo+rene...@jmondi.org>
---
drivers/media/i2c/adv748x/adv748x-core.c | 63 +++++++++++++++++++++++++++++++-
drivers/media/i2c/adv748x/adv748x.h | 1 +
2 files changed, 63 insertions(+), 1 deletion(-)
diff --git a/drivers/media/i2c/adv748x/adv748x-core.c
b/drivers/media/i2c/adv748x/adv748x-core.c
index f3aabbccdfb5..08dc0e89b053 100644
--- a/drivers/media/i2c/adv748x/adv748x-core.c
+++ b/drivers/media/i2c/adv748x/adv748x-core.c
@@ -335,9 +335,70 @@ int adv748x_tx_power(struct adv748x_csi2 *tx, bool on)
/*
-----------------------------------------------------------------------------
* Media Operations
*/
+static int adv748x_link_setup(struct media_entity *entity,
+ const struct media_pad *local,
+ const struct media_pad *remote, u32 flags)
+{
+ struct v4l2_subdev *rsd = media_entity_to_v4l2_subdev(remote->entity);
+ struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
+ struct adv748x_state *state = v4l2_get_subdevdata(sd);
+ struct adv748x_csi2 *tx;
+ struct media_link *link;
+ u8 io10;
+
+ /*
+ * For each link setup from [HDMI|AFE] to TX we receive two
+ * notifications: "[HDMI|AFE]->TX" and "TX<-[HDMI|AFE]".
+ *
+ * Use the second notification form to make sure we're linking
+ * to a TX and find out from where, to set up routing properly.
+ */
+ if ((sd != &state->txa.sd && sd != &state->txb.sd) ||
+ !(flags & MEDIA_LNK_FL_ENABLED))
+ return 0;
+ tx = adv748x_sd_to_csi2(sd);
+
+ /*
+ * Now that we're sure we're operating on one of the two TXs,
+ * make sure there are no enabled links ending there from
+ * either HDMI or AFE (this can only happens for TXA though).
+ */
+ if (is_txa(tx))
+ list_for_each_entry(link, &entity->links, list)
+ if (link->sink->entity == entity &&
+ link->flags & MEDIA_LNK_FL_ENABLED)
+ return -EINVAL;
+
+ /* Change video stream routing, according to the newly created link. */
+ io10 = io_read(state, ADV748X_IO_10);
+ if (rsd == &state->afe.sd) {
+ state->afe.tx = tx;
+
+ /*
+ * If AFE is routed to TXA, make sure TXB is off;
+ * If AFE goes to TXB, we need TXA powered on.
+ */
+ if (is_txa(tx)) {
+ io10 |= ADV748X_IO_10_CSI4_IN_SEL_AFE;
+ io10 &= ~ADV748X_IO_10_CSI1_EN;
+ } else {
+ io10 |= ADV748X_IO_10_CSI4_EN |
+ ADV748X_IO_10_CSI1_EN;
+ }
+ } else {
+ state->hdmi.tx = tx;
+ io10 &= ~ADV748X_IO_10_CSI4_IN_SEL_AFE;
+ }
+ io_write(state, ADV748X_IO_10, io10);
+
+ tx->rsd = rsd;
+
+ return 0;
+}
static const struct media_entity_operations adv748x_media_ops = {
- .link_validate = v4l2_subdev_link_validate,
+ .link_setup = adv748x_link_setup,
+ .link_validate = v4l2_subdev_link_validate,
};
/*
-----------------------------------------------------------------------------
diff --git a/drivers/media/i2c/adv748x/adv748x.h
b/drivers/media/i2c/adv748x/adv748x.h
index 0ee3b8d5c795..63a17c31c169 100644
--- a/drivers/media/i2c/adv748x/adv748x.h
+++ b/drivers/media/i2c/adv748x/adv748x.h
@@ -220,6 +220,7 @@ struct adv748x_state {
#define ADV748X_IO_10_CSI4_EN BIT(7)
#define ADV748X_IO_10_CSI1_EN BIT(6)
#define ADV748X_IO_10_PIX_OUT_EN BIT(5)
+#define ADV748X_IO_10_CSI4_IN_SEL_AFE 0x08
#define ADV748X_IO_CHIP_REV_ID_1 0xdf
#define ADV748X_IO_CHIP_REV_ID_2 0xe0
--
2.7.4
