1. [CCG2 is power sink role] Adjust request PDO as per SOURCE CAP advertised.
{CCG2 firmware is following PD 2.0 SPEC, the function static bool is_src_acceptable_snk(tPD_DO* pdo_src, tPD_DO* pdo_snk) @ file cy_solution.c is for checking which sink PDO is acceptable based on the SOURC_CAP from DFP. CCG2 firmware is select out the one match the SOURCE_CAP as per Power Delivery SPEC, which is means, the sink voltage and current shall be covered by SOURCE_CAP (Voltage shall be match, Current of SOUCE CAP s larger or equal sink capabilities), otherwise, CCG2 will request 5V request.}
>> Need update the case PDO_FIXED_SUPPLY. Example is below
case PDO_FIXED_SUPPLY:
if(fix_volt == pdo_snk->fixed_snk.voltage)
{
max_type_cur = get_max_cur(0u, pdo_snk, fix_volt);
if(pdo_src->fixed_src.max_current >= max_type_cur)
{
contract_power = udiv_round_up(fix_volt * pdo_snk->fixed_snk.op_current, 500u);
contract_voltage = fix_volt;
op_cur_power = pdo_snk->fixed_snk.op_current;
out = true;
}
//Added for update current for mismatch current only
else if(fix_volt > V_SAFE_5V)
{
contract_power = udiv_round_up(fix_volt * pdo_src->fixed_src.max_current, 500u);
contract_voltage = fix_volt;
op_cur_power = pdo_src->fixed_src.max_current;
max_type_cur = pdo_src->fixed_src.max_current;
out = true;
}
}
break;
2. [CCG2 is power sink role] Request DR_SWAP or PR_SWAP
{Type-C SPEC defines Power source role as data host by default and power sink role as data device. Type-C can support Power role is not sync with data role. For example, Power source role and data sink role.}
>> Firmware implement process is: (PR_SWAP for example, and expect to work as Power source role.)
a. Check current role.((get_current_port_role() == PRT_ROLE_SINK) )
{There may need add more conditions to go ahead to next step, for example, make sure power source is already asserted.}
b. send PR_SWAP if the current role is not match the expect. (handle_pd_command (DPM_CMD_PR_SWAP, NULL, NULL); )
