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usb: typec: intel_pmc_mux: Avoid connect request on disconnect

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When pmc_usb_mux_set() is invoked when a device is disconnected, a valid
scenario is for state->alt == NULL and state->mode == TYPEC_STATE_USB.

In such cases, if a pmc_usb_disconnect() has already been issued (from
either pmc_usb_set_orientation() when orientation ==
TYPEC_ORIENTATION_NONE, or pmc_usb_set_role() when role ==
USB_ROLE_NONE), a pmc_usb_connect() will be issued despite no peripheral
being present.

This confuses the PMC and leads to all subsequent PMC IPC requests
returning errors due to timeout.

To prevent this, return early if the port orientation or role is already
set to none.

Cc: Benson Leung <bleung@chromium.org>
Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Rajmohan Mani <rajmohan.mani@intel.com>
Fixes: f3c1c41ebc ("usb: typec: intel_pmc_mux: Add support for USB4")
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Link: https://lore.kernel.org/r/20200709002441.1309189-1-pmalani@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Prashant Malani 2020-07-08 17:24:41 -07:00 committed by Greg Kroah-Hartman
parent b1b6bed3b5
commit 658027afea
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/typec/mux/intel_pmc_mux.c
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@ -310,6 +310,9 @@ pmc_usb_mux_set(struct typec_mux *mux, struct typec_mux_state *state)
{
struct pmc_usb_port *port = typec_mux_get_drvdata(mux);
if (port->orientation == TYPEC_ORIENTATION_NONE || port->role == USB_ROLE_NONE)
return 0;
if (state->mode == TYPEC_STATE_SAFE)
return pmc_usb_mux_safe_state(port);
if (state->mode == TYPEC_STATE_USB)