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Subject[PATCH v2 08/11] staging: typec: tcpm: Set mux to device mode when configured as such
Date
Setting the mux to TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT when the
data-role is device is not correct. Plenty of devices support operating
as USB device through a (separate) USB device controller.

So this commit instead splits out TYPEC_MUX_USB into TYPEC_MUX_USB_HOST
and TYPEC_MUX_USB_DEVICE and makes tcpm_set_roles() set the mux
accordingly.

Likewise TCPC_MUX_DP gets renamed to TCPC_MUX_DP_SRC to make clear that
this is for configuring the Type-C port as a Display Port source, not a
sink.

Last this commit makes tcpm_reset_port() to set the mux to
TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT so that it does not and up
staying in host (and with this commit also device) mode after a detach.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/staging/typec/tcpm.c | 7 ++++---
drivers/staging/typec/tcpm.h | 22 ++++++++++++++--------
2 files changed, 18 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
index 8af62e74d54c..ffe7e26d4ed3 100644
--- a/drivers/staging/typec/tcpm.c
+++ b/drivers/staging/typec/tcpm.c
@@ -752,11 +752,11 @@ static int tcpm_set_roles(struct tcpm_port *port, bool attached,
int ret;

if (data == TYPEC_HOST)
- ret = tcpm_mux_set(port, TYPEC_MUX_USB,
+ ret = tcpm_mux_set(port, TYPEC_MUX_USB_HOST,
TCPC_USB_SWITCH_CONNECT);
else
- ret = tcpm_mux_set(port, TYPEC_MUX_NONE,
- TCPC_USB_SWITCH_DISCONNECT);
+ ret = tcpm_mux_set(port, TYPEC_MUX_USB_DEVICE,
+ TCPC_USB_SWITCH_CONNECT);
if (ret < 0)
return ret;

@@ -2025,6 +2025,7 @@ static void tcpm_reset_port(struct tcpm_port *port)
tcpm_init_vconn(port);
tcpm_set_current_limit(port, 0, 0);
tcpm_set_polarity(port, TYPEC_POLARITY_CC1);
+ tcpm_mux_set(port, TYPEC_MUX_NONE, TCPC_USB_SWITCH_DISCONNECT);
tcpm_set_attached_state(port, false);
port->try_src_count = 0;
port->try_snk_count = 0;
diff --git a/drivers/staging/typec/tcpm.h b/drivers/staging/typec/tcpm.h
index 7e9a6b7b5cd6..f662eed48c86 100644
--- a/drivers/staging/typec/tcpm.h
+++ b/drivers/staging/typec/tcpm.h
@@ -83,17 +83,23 @@ enum tcpc_usb_switch {
};

/* Mux state attributes */
-#define TCPC_MUX_USB_ENABLED BIT(0) /* USB enabled */
-#define TCPC_MUX_DP_ENABLED BIT(1) /* DP enabled */
-#define TCPC_MUX_POLARITY_INVERTED BIT(2) /* Polarity inverted */
+#define TCPC_MUX_USB_DEVICE_ENABLED BIT(0) /* USB device enabled */
+#define TCPC_MUX_USB_HOST_ENABLED BIT(1) /* USB host enabled */
+#define TCPC_MUX_DP_SRC_ENABLED BIT(2) /* DP enabled */
+#define TCPC_MUX_POLARITY_INVERTED BIT(3) /* Polarity inverted */

/* Mux modes, decoded to attributes */
enum tcpc_mux_mode {
- TYPEC_MUX_NONE = 0, /* Open switch */
- TYPEC_MUX_USB = TCPC_MUX_USB_ENABLED, /* USB only */
- TYPEC_MUX_DP = TCPC_MUX_DP_ENABLED, /* DP only */
- TYPEC_MUX_DOCK = TCPC_MUX_USB_ENABLED | /* Both USB and DP */
- TCPC_MUX_DP_ENABLED,
+ /* Open switch */
+ TYPEC_MUX_NONE = 0,
+ /* USB device only */
+ TYPEC_MUX_USB_DEVICE = TCPC_MUX_USB_DEVICE_ENABLED,
+ /* USB host only */
+ TYPEC_MUX_USB_HOST = TCPC_MUX_USB_HOST_ENABLED,
+ /* DP source only */
+ TYPEC_MUX_DP = TCPC_MUX_DP_SRC_ENABLED,
+ /* Both USB host and DP source */
+ TYPEC_MUX_DOCK = TCPC_MUX_USB_HOST_ENABLED | TCPC_MUX_DP_SRC_ENABLED,
};

struct tcpc_mux_dev {
--
2.13.5
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