>>> Now, most of controllers set hcd->has_tt = 1, but they may not have
>>> hostpc. Why you think these two things have relationship?
>> Setting has_tt and has_lpm can't work without has_hostpc, they have
>> incompatible
>> register layout for port register :
>> :
>> has_lpm
>> #define PORT_LPM (1<<9) /* LPM transaction */
>> #define PORT_DEV_ADDR (0x7f<<25) /* device address */
>> #define PORT_SSTS (0x3<<23) /* suspend status */
>>
>> has_tt (without has_hostpc)
>> 9 HSP (high speed status)
>> 23 PHCD (phy clock disable)
>> 24 PFSC (force speed)
>> 26-27 (port speed)
>>
> I mean why set ehci->has_hostpc = 1 when hcd->has_tt =1
> Is it possible read register to know if has_hostpc and has_lpm?
>
>
I think you miss some context. The code is [1]. So ehci->has_hostpc is set when
hcd->has_tt =1 and ehci->has_lpm = 1.
Matthieu
[1]
if (HCC_LPM(hcc_params)) {
/* support link power management EHCI 1.1 addendum */
ehci_dbg(ehci, "support lpm\n");
ehci->has_lpm = 1;
if (hird > 0xf) {
ehci_dbg(ehci, "hird %d invalid, use default 0",
hird);
hird = 0;
}
temp |= hird << 24;
if (ehci_is_TDI(ehci)) {
ehci->has_hostpc = 1;
ehci->has_tdi_phy_lpm = 1;
}
}
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