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Subject[PATCH 7/7] drm/bridge: anx7625: Add typec_mux_set callback function
Date
From: Pin-Yen Lin <treapking@chromium.org>

Add the callback function when the driver receives state
changes of the Type-C port. The callback function configures the
crosspoint switch of the anx7625 bridge chip, which can change the
output pins of the signals according to the port state.

Signed-off-by: Pin-Yen Lin <treapking@chromium.org>
Signed-off-by: Prashant Malani <pmalani@chromium.org>
---
drivers/gpu/drm/bridge/analogix/anx7625.c | 58 +++++++++++++++++++++++
drivers/gpu/drm/bridge/analogix/anx7625.h | 13 +++++
2 files changed, 71 insertions(+)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index d41a21103bd3..2c308d12fab2 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -15,6 +15,7 @@
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/types.h>
+#include <linux/usb/typec_dp.h>
#include <linux/usb/typec_mux.h>
#include <linux/workqueue.h>

@@ -2582,9 +2583,66 @@ static void anx7625_runtime_disable(void *data)
pm_runtime_disable(data);
}

+static void anx7625_set_crosspoint_switch(struct anx7625_data *ctx,
+ enum typec_orientation orientation)
+{
+ if (orientation == TYPEC_ORIENTATION_NORMAL) {
+ anx7625_reg_write(ctx, ctx->i2c.tcpc_client, TCPC_SWITCH_0,
+ SW_SEL1_SSRX_RX1 | SW_SEL1_DPTX0_RX2);
+ anx7625_reg_write(ctx, ctx->i2c.tcpc_client, TCPC_SWITCH_1,
+ SW_SEL2_SSTX_TX1 | SW_SEL2_DPTX1_TX2);
+ } else if (orientation == TYPEC_ORIENTATION_REVERSE) {
+ anx7625_reg_write(ctx, ctx->i2c.tcpc_client, TCPC_SWITCH_0,
+ SW_SEL1_SSRX_RX2 | SW_SEL1_DPTX0_RX1);
+ anx7625_reg_write(ctx, ctx->i2c.tcpc_client, TCPC_SWITCH_1,
+ SW_SEL2_SSTX_TX2 | SW_SEL2_DPTX1_TX1);
+ }
+}
+
+static void anx7625_typec_two_ports_update(struct anx7625_data *ctx)
+{
+ if (ctx->typec_ports[0].dp_connected && ctx->typec_ports[1].dp_connected)
+ /* Both ports available, do nothing to retain the current one. */
+ return;
+ else if (ctx->typec_ports[0].dp_connected)
+ anx7625_set_crosspoint_switch(ctx, TYPEC_ORIENTATION_NORMAL);
+ else if (ctx->typec_ports[1].dp_connected)
+ anx7625_set_crosspoint_switch(ctx, TYPEC_ORIENTATION_REVERSE);
+}
+
static int anx7625_typec_mux_set(struct typec_mux_dev *mux,
struct typec_mux_state *state)
{
+ struct anx7625_port_data *data = typec_mux_get_drvdata(mux);
+ struct anx7625_data *ctx = data->ctx;
+ struct device *dev = &ctx->client->dev;
+
+ bool old_dp_connected = (ctx->typec_ports[0].dp_connected ||
+ ctx->typec_ports[1].dp_connected);
+ bool new_dp_connected;
+
+ if (ctx->num_typec_switches == 1)
+ return 0;
+
+ dev_dbg(dev, "mux_set dp_connected: c0=%d, c1=%d\n",
+ ctx->typec_ports[0].dp_connected, ctx->typec_ports[1].dp_connected);
+
+ data->dp_connected = (state->alt && state->alt->svid == USB_TYPEC_DP_SID &&
+ state->alt->mode == USB_TYPEC_DP_MODE);
+
+ new_dp_connected = (ctx->typec_ports[0].dp_connected ||
+ ctx->typec_ports[1].dp_connected);
+
+ /* dp on, power on first */
+ if (!old_dp_connected && new_dp_connected)
+ pm_runtime_get_sync(dev);
+
+ anx7625_typec_two_ports_update(ctx);
+
+ /* dp off, power off last */
+ if (old_dp_connected && !new_dp_connected)
+ pm_runtime_put_sync(dev);
+
return 0;
}

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index 76cfc64f7574..7d6c6fdf9a3a 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -55,6 +55,18 @@
#define HPD_STATUS_CHANGE 0x80
#define HPD_STATUS 0x80

+#define TCPC_SWITCH_0 0xB4
+#define SW_SEL1_DPTX0_RX2 BIT(0)
+#define SW_SEL1_DPTX0_RX1 BIT(1)
+#define SW_SEL1_SSRX_RX2 BIT(4)
+#define SW_SEL1_SSRX_RX1 BIT(5)
+
+#define TCPC_SWITCH_1 0xB5
+#define SW_SEL2_DPTX1_TX2 BIT(0)
+#define SW_SEL2_DPTX1_TX1 BIT(1)
+#define SW_SEL2_SSTX_TX2 BIT(4)
+#define SW_SEL2_SSTX_TX1 BIT(5)
+
/******** END of I2C Address 0x58 ********/

/***************************************************************/
@@ -444,6 +456,7 @@ struct anx7625_i2c_client {
};

struct anx7625_port_data {
+ bool dp_connected;
struct typec_mux_dev *typec_mux;
struct anx7625_data *ctx;
};
--
2.36.1.255.ge46751e96f-goog
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