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usb: typec: mux: intel: Handle alt mode HPD_HIGH

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According to the PMC Type C Subsystem (TCSS) Mux programming guide rev
0.6, when a device is transitioning to DP Alternate Mode state, if the
HPD_STATE (bit 7) field in the status update command VDO is set to
HPD_HIGH, the HPD_HIGH field in the Alternate Mode request “mode_data”
field (bit 14) should also be set. Ensure the bit is correctly handled
while issuing the Alternate Mode request.

Signed-off-by: Prashant Malani <pmalani@chromium.org>
Fixes: 6701adfa9693 ("usb: typec: driver for Intel PMC mux control")
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20200429054432.134178-1-pmalani@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Prashant Malani 2020-04-28 22:44:28 -07:00 committed by Greg Kroah-Hartman
parent 2bef9aed6f
commit 7990be48ef
1 changed files with 4 additions and 0 deletions
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4
drivers/usb/typec/mux/intel_pmc_mux.c
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@ -157,6 +157,10 @@ pmc_usb_mux_dp(struct pmc_usb_port *port, struct typec_mux_state *state)
req.mode_data |= (state->mode - TYPEC_STATE_MODAL) <<
PMC_USB_ALTMODE_DP_MODE_SHIFT;
if (data->status & DP_STATUS_HPD_STATE)
req.mode_data |= PMC_USB_DP_HPD_LVL <<
PMC_USB_ALTMODE_DP_MODE_SHIFT;
return pmc_usb_command(port, (void *)&req, sizeof(req));
}