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usb: typec: mux: intel_pmc_mux: Fix DP alternate mode entry 

The PMC needs to be notified separately about HPD (hotplug
detected) signal being high after mode entry. There is a bit
"HPD High" in the Alternate Mode Request that the driver
already sets, but that bit is only valid when the
DisplayPort Alternate Mode is directly entered from
disconnected state.

Fixes: 5c4edcdbcd ("usb: typec: mux: intel: Fix DP_HPD_LVL bit field")
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: stable <stable@vger.kernel.org>
Tested-by: Prashant Malani <pmalani@chromium.org>
Link: https://lore.kernel.org/r/20200529131753.15587-1-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2020-05-29 16:17:53 +03:00 committed by Greg Kroah-Hartman
parent 3d19946b50
commit 130206a886
1 changed files with 11 additions and 2 deletions
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11
drivers/usb/typec/mux/intel_pmc_mux.c
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@ -148,6 +148,7 @@ pmc_usb_mux_dp_hpd(struct pmc_usb_port *port, struct typec_mux_state *state)
msg[0] = PMC_USB_DP_HPD;
msg[0] |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
if (data->status & DP_STATUS_IRQ_HPD)
msg[1] = PMC_USB_DP_HPD_IRQ;
if (data->status & DP_STATUS_HPD_STATE)
@ -161,6 +162,7 @@ pmc_usb_mux_dp(struct pmc_usb_port *port, struct typec_mux_state *state)
{
struct typec_displayport_data *data = state->data;
struct altmode_req req = { };
int ret;
if (data->status & DP_STATUS_IRQ_HPD)
return pmc_usb_mux_dp_hpd(port, state);
@ -181,7 +183,14 @@ pmc_usb_mux_dp(struct pmc_usb_port *port, struct typec_mux_state *state)
if (data->status & DP_STATUS_HPD_STATE)
req.mode_data |= PMC_USB_ALTMODE_HPD_HIGH;
return pmc_usb_command(port, (void *)&req, sizeof(req));
ret = pmc_usb_command(port, (void *)&req, sizeof(req));
if (ret)
return ret;
if (data->status & DP_STATUS_HPD_STATE)
return pmc_usb_mux_dp_hpd(port, state);
return 0;
}
static int