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usb: typec: intel_pmc_mux: Configure HPD first for HPD+IRQ request 

Warm reboot scenarios some times type C Mux driver gets Mux configuration
request as HPD=1,IRQ=1. In that scenario typeC Mux driver need to configure
Mux as follows as per IOM requirement:
 (1). Confgiure Mux HPD = 1, IRQ = 0
 (2). Configure Mux with HPD = 1, IRQ = 1

IOM expects TypeC Mux configuration as follows:
 (1). HPD=1, IRQ=0
 (2). HPD=1, IRQ=1
if IOM gets mux config request (2) without configuring (1), it will ignore
the request. The impact of this is there is no DP_alt mode display.

Fixes: 43d596e322 ("usb: typec: intel_pmc_mux: Check the port status before connect")
Cc: stable@vger.kernel.org
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Madhusudanarao Amara <madhusudanarao.amara@intel.com>
Link: https://lore.kernel.org/r/20201216140918.49197-1-madhusudanarao.amara@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Madhusudanarao Amara 2020-12-16 19:39:18 +05:30 committed by Greg Kroah-Hartman
parent 5e5ff0b4b6
commit 0f041b8592
1 changed files with 11 additions and 0 deletions
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11
drivers/usb/typec/mux/intel_pmc_mux.c
View File

@ -207,10 +207,21 @@ static int
pmc_usb_mux_dp_hpd(struct pmc_usb_port *port, struct typec_displayport_data *dp)
{
u8 msg[2] = { };
int ret;
msg[0] = PMC_USB_DP_HPD;
msg[0] |= port->usb3_port << PMC_USB_MSG_USB3_PORT_SHIFT;
/* Configure HPD first if HPD,IRQ comes together */
if (!IOM_PORT_HPD_ASSERTED(port->iom_status) &&
dp->status & DP_STATUS_IRQ_HPD &&
dp->status & DP_STATUS_HPD_STATE) {
msg[1] = PMC_USB_DP_HPD_LVL;
ret = pmc_usb_command(port, msg, sizeof(msg));
if (ret)
return ret;
}
if (dp->status & DP_STATUS_IRQ_HPD)
msg[1] = PMC_USB_DP_HPD_IRQ;