Register an orientation switch for each type-c output node to support
flipping the lane mapping when the port is in reverse orientation. Only
do this when the orientation-switch property is present. This is mostly
useful for the case where the DP lanes are directly connected to the
usb-c-connector and the device doesn't have an orientation switch wired
down on the board between the connector and the DP controller.
Cc: Prashant Malani <pmal...@chromium.org>
Cc: Benson Leung <ble...@chromium.org>
Cc: Tzung-Bi Shih <tzun...@kernel.org>
Cc: <chrome-platf...@lists.linux.dev>
Cc: Pin-yen Lin <treapk...@chromium.org>
Cc: Dmitry Baryshkov <dmitry.barysh...@linaro.org>
Signed-off-by: Stephen Boyd <swb...@chromium.org>
---
drivers/gpu/drm/bridge/aux-hpd-bridge.c | 77 +++++++++++++++++++++----
1 file changed, 66 insertions(+), 11 deletions(-)
diff --git a/drivers/gpu/drm/bridge/aux-hpd-bridge.c
b/drivers/gpu/drm/bridge/aux-hpd-bridge.c
index 32565f88ade7..d2832e6481d7 100644
--- a/drivers/gpu/drm/bridge/aux-hpd-bridge.c
+++ b/drivers/gpu/drm/bridge/aux-hpd-bridge.c
@@ -47,12 +47,16 @@ struct drm_dp_typec_bridge_data;
/**
* struct drm_dp_typec_bridge_typec_port - USB type-c port associated with DP
bridge
* @lane_mapping: Physical (array index) to logical (array value) USB type-C
lane mapping
+ * @orientation: Orientation of USB type-c port
* @mode_switch: DP altmode switch
+ * @orientation_switch: USB type-c orientation switch
* @typec_data: Back pointer to type-c bridge data
*/
struct drm_dp_typec_bridge_typec_port {
u32 lane_mapping[NUM_USB_SS];
+ enum typec_orientation orientation;
struct typec_mux_dev *mode_switch;
+ struct typec_switch_dev *orientation_switch;
struct drm_dp_typec_bridge_data *typec_data;
};
@@ -378,17 +382,35 @@ static int dp_lane_to_typec_lane(enum dp_lane lane)
return -EINVAL;
}
-static int typec_to_dp_lane(enum usb_ss_lane lane)
+static int typec_to_dp_lane(enum usb_ss_lane lane,
+ enum typec_orientation orientation)
{
- switch (lane) {
- case USB_SSRX1:
- return DP_ML3;
- case USB_SSTX1:
- return DP_ML2;
- case USB_SSTX2:
- return DP_ML0;
- case USB_SSRX2:
- return DP_ML1;
+ switch (orientation) {
+ case TYPEC_ORIENTATION_NONE:
+ case TYPEC_ORIENTATION_NORMAL:
+ switch (lane) {
+ case USB_SSRX1:
+ return DP_ML3;
+ case USB_SSTX1:
+ return DP_ML2;
+ case USB_SSTX2:
+ return DP_ML0;
+ case USB_SSRX2:
+ return DP_ML1;
+ }
+ break;
+ case TYPEC_ORIENTATION_REVERSE:
+ switch (lane) {
+ case USB_SSRX1:
+ return DP_ML0;
+ case USB_SSTX1:
+ return DP_ML1;
+ case USB_SSTX2:
+ return DP_ML3;
+ case USB_SSRX2:
+ return DP_ML2;
+ }
+ break;
}
return -EINVAL;
@@ -413,6 +435,7 @@ drm_dp_typec_bridge_assign_pins(struct
drm_dp_typec_bridge_dev *typec_bridge_dev
u32 conf,
struct drm_dp_typec_bridge_typec_port *port)
{
+ enum typec_orientation orientation = port->orientation;
enum usb_ss_lane *lane_mapping = port->lane_mapping;
struct auxiliary_device *adev = &typec_bridge_dev->adev;
struct drm_aux_hpd_bridge_data *hpd_data = auxiliary_get_drvdata(adev);
@@ -448,7 +471,7 @@ drm_dp_typec_bridge_assign_pins(struct
drm_dp_typec_bridge_dev *typec_bridge_dev
typec_lane = lane_mapping[typec_lane];
/* Map logical type-c lane to logical DP lane */
- dp_lanes[i] = typec_to_dp_lane(typec_lane);
+ dp_lanes[i] = typec_to_dp_lane(typec_lane, orientation);
}
return 0;
@@ -496,6 +519,23 @@ static const struct drm_bridge_funcs
drm_dp_typec_bridge_funcs = {
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
};
+static int drm_dp_typec_bridge_orientation_set(struct typec_switch_dev *sw,
+ enum typec_orientation
orientation)
+{
+ struct drm_dp_typec_bridge_typec_port *port;
+
+ /*
+ * Lane remapping is in drm_dp_typec_bridge_mode_switch_set(). Whenever
+ * an orientation changes the mode will switch in and out of DP mode,
+ * HPD will deassert and reassert so that
+ * drm_dp_typec_bridge_atomic_check() sees the proper state.
+ */
+ port = typec_switch_get_drvdata(sw);
+ port->orientation = orientation;
+
+ return 0;
+}
+
static int
drm_dp_typec_bridge_mode_switch_set(struct typec_mux_dev *mode_switch,
struct typec_mux_state *state)
@@ -544,7 +584,9 @@ drm_dp_typec_bridge_probe_typec_ports(struct
drm_dp_typec_bridge_data *typec_dat
struct drm_dp_typec_bridge_typec_port *port;
size_t num_ports = typec_bridge_dev->num_typec_ports;
struct typec_mux_desc mode_switch_desc = { };
+ struct typec_switch_desc orientation_switch_desc = { };
struct fwnode_handle *fwnode;
+ bool orientation = of_property_read_bool(np, "orientation-switch");
const char *name;
port = devm_kcalloc(dev, num_ports, sizeof(*port), GFP_KERNEL);
@@ -587,6 +629,19 @@ drm_dp_typec_bridge_probe_typec_ports(struct
drm_dp_typec_bridge_data *typec_dat
return PTR_ERR(port->mode_switch);
}
+ if (orientation) {
+ orientation_switch_desc.set =
drm_dp_typec_bridge_orientation_set,
+ orientation_switch_desc.fwnode = fwnode;
+ orientation_switch_desc.drvdata = port;
+ orientation_switch_desc.name = name;
+ port->orientation_switch = typec_switch_register(dev,
+
&orientation_switch_desc);
+ if (IS_ERR(port->orientation_switch)) {
+ kfree(name);
+ return PTR_ERR(port->orientation_switch);
+ }
+ }
+
kfree(name);
port++;
}
--
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