4.18-stable review patch. If anyone has any objections, please let me know.
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From: Adam Thomson Adam.Thomson.Opensource@diasemi.com
[ Upstream commit 554fab6dbf20ee7298ed2d4e8398b85e6058abb7 ]
Currently when requesting a specific voltage or current through the psy interface, for PPS, when reading back from that interface the values will always be the same as previously given, if the request was successful. However PPS only allows for 20mV voltage steps and 50mA current steps, and the psy class expects microvolt and micro amp requests, so inbetween values can be provided through this interface. Really when reading back the true values negotiated should be given, and not the ones originally asked for.
To report the actual values negotiated with the Source, the values stored are now rounded down to the relevant step units prior to building the PPS request, so that those values are later correctly reported through the psy interface. In addition this improves the adjustments made to meet the operating power requirements of the platform, which previously could have been slightly out due to not using valid PPS units of voltage and current.
Signed-off-by: Adam Thomson Adam.Thomson.Opensource@diasemi.com Reviewed-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/typec/tcpm.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/usb/typec/tcpm.c +++ b/drivers/usb/typec/tcpm.c @@ -4018,6 +4018,9 @@ static int tcpm_pps_set_op_curr(struct t goto port_unlock; }
+ /* Round down operating current to align with PPS valid steps */ + op_curr = op_curr - (op_curr % RDO_PROG_CURR_MA_STEP); + reinit_completion(&port->pps_complete); port->pps_data.op_curr = op_curr; port->pps_status = 0; @@ -4071,6 +4074,9 @@ static int tcpm_pps_set_out_volt(struct goto port_unlock; }
+ /* Round down output voltage to align with PPS valid steps */ + out_volt = out_volt - (out_volt % RDO_PROG_VOLT_MV_STEP); + reinit_completion(&port->pps_complete); port->pps_data.out_volt = out_volt; port->pps_status = 0;