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 | 57 +++++++++++++++++++++++-
drivers/media/i2c/adv748x/adv748x.h | 2 +
2 files changed, 58 insertions(+), 1 deletion(-)
diff --git a/drivers/media/i2c/adv748x/adv748x-core.c
b/drivers/media/i2c/adv748x/adv748x-core.c
index 200e00f93546..a586bf393558 100644
--- a/drivers/media/i2c/adv748x/adv748x-core.c
+++ b/drivers/media/i2c/adv748x/adv748x-core.c
@@ -335,6 +335,60 @@ 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 = adv748x_sd_to_csi2(sd);
+ bool enable = flags & MEDIA_LNK_FL_ENABLED;
+ u8 io10;
+
+ /* Refuse to enable multiple links to the same TX at the same time. */
+ if (enable && tx->src)
+ return -EINVAL;
+
+ /* Set or clear the source (HDMI or AFE) and the current TX. */
+ if (rsd == &state->afe.sd)
+ state->afe.tx = enable ? tx : NULL;
+ else
+ state->hdmi.tx = enable ? tx : NULL;
+
+ tx->src = enable ? rsd : NULL;
+
+ if (!enable)
+ return 0;
+
+ /* Change video stream routing, according to the newly enabled link. */
+ io10 = io_read(state, ADV748X_IO_10);
+ if (rsd == &state->afe.sd) {
+ /*
+ * Set AFE->TXA routing and power off TXB if AFE goes to TXA.
+ * if AFE goes to TXB, we need both TXA and TXB powered on.
+ */
+ io10 &= ~ADV748X_IO_10_CSI1_EN;
+ io10 &= ~ADV748X_IO_10_CSI4_IN_SEL_AFE;
+ if (is_txa(tx))
+ io10 |= ADV748X_IO_10_CSI4_IN_SEL_AFE;
+ else
+ io10 |= ADV748X_IO_10_CSI4_EN |
+ ADV748X_IO_10_CSI1_EN;
+ } else {
+ /* Clear AFE->TXA routing and power up TXA. */
+ io10 &= ~ADV748X_IO_10_CSI4_IN_SEL_AFE;
+ io10 |= ADV748X_IO_10_CSI4_EN;
+ }
+ io_write(state, ADV748X_IO_10, io10);
+
+ return 0;
+}
+
+static const struct media_entity_operations adv748x_tx_media_ops = {
+ .link_setup = adv748x_link_setup,
+ .link_validate = v4l2_subdev_link_validate,
+};
static const struct media_entity_operations adv748x_media_ops = {
.link_validate = v4l2_subdev_link_validate,
@@ -516,7 +570,8 @@ void adv748x_subdev_init(struct v4l2_subdev *sd, struct
adv748x_state *state,
state->client->addr, ident);
sd->entity.function = function;
- sd->entity.ops = &adv748x_media_ops;
+ sd->entity.ops = is_tx(adv748x_sd_to_csi2(sd)) ?
+ &adv748x_tx_media_ops : &adv748x_media_ops;
}
static int adv748x_parse_csi2_lanes(struct adv748x_state *state,
diff --git a/drivers/media/i2c/adv748x/adv748x.h
b/drivers/media/i2c/adv748x/adv748x.h
index 6eb2e4a95eed..eb19c6cbbb4e 100644
--- a/drivers/media/i2c/adv748x/adv748x.h
+++ b/drivers/media/i2c/adv748x/adv748x.h
@@ -93,6 +93,7 @@ struct adv748x_csi2 {
#define is_tx_enabled(_tx) ((_tx)->state->endpoints[(_tx)->port] != NULL)
#define __is_tx(_tx, _ab) ((_tx) == &(_tx)->state->tx##_ab)
+#define is_tx(_tx) (is_txa(_tx) || is_txb(_tx))
#define is_txa(_tx) __is_tx(_tx, a)
#define is_txb(_tx) __is_tx(_tx, b)
@@ -224,6 +225,7 @@ 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 BIT(3)
#define ADV748X_IO_CHIP_REV_ID_1 0xdf
#define ADV748X_IO_CHIP_REV_ID_2 0xe0
--
2.20.1
