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FAILED: patch "[PATCH] usb: typec: tcpm: Address incorrect values of tcpm psy for" failed to apply to 4.19-stable tree

PATCH [email protected] 1 participant 1 message May 12, 2021

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Stable branch USB USB Type-C class USB Type-C port controller drivers
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The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f3dedafb8263ca4791a92a23f5230068f5bde008 Mon Sep 17 00:00:00 2001
From: Badhri Jagan Sridharan <[email protected]>
Date: Wed, 7 Apr 2021 13:07:18 -0700
Subject: [PATCH] usb: typec: tcpm: Address incorrect values of tcpm psy for
fixed supply

tcpm_pd_build_request overwrites current_limit and supply_voltage even before port partner accepts the requests. This leaves stale values in current_limit and supply_voltage that get exported by "tcpm-source-psy-". Solving this problem by caching the request values of current limit/supply voltage in req_current_limit and req_supply_voltage. current_limit/supply_voltage gets updated once the port partner accepts the request.

Fixes f2a8aa053c176 ("typec: tcpm: Represent source supply through power_supply")
Signed-off-by Badhri Jagan Sridharan <[email protected]>
Cc stable <[email protected]>
Reviewed-by Guenter Roeck <[email protected]>
Reviewed-by Adam Thomson <[email protected]>
Reviewed-by Heikki Krogerus <[email protected]>
Link https://lore.kernel.org/r/[email protected] open here
Signed-off-by Greg Kroah-Hartman <[email protected]>
drivers/usb/typec/tcpm/tcpm.c +10 -7
index ca1fc77697fc..4ea4b30ae885 100644
@@ -389,7 +389,10 @@ struct tcpm_port {
 	unsigned int operating_snk_mw;
 	bool update_sink_caps;
 
-	/* Requested current / voltage */
+	/* Requested current / voltage to the port partner */
+	u32 req_current_limit;
+	u32 req_supply_voltage;
+	/* Actual current / voltage limit of the local port */
 	u32 current_limit;
 	u32 supply_voltage;
 

@@ -2435,8 +2438,8 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
 		case SNK_TRANSITION_SINK:
 			if (port->vbus_present) {
 				tcpm_set_current_limit(port,
-						       port->current_limit,
-						       port->supply_voltage);
+						       port->req_current_limit,
+						       port->req_supply_voltage);
 				port->explicit_contract = true;
 				tcpm_set_auto_vbus_discharge_threshold(port,
 								       TYPEC_PWR_MODE_PD,

@@ -2545,8 +2548,8 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
 			break;
 		case SNK_NEGOTIATE_PPS_CAPABILITIES:
 			port->pps_data.active = true;
-			port->supply_voltage = port->pps_data.out_volt;
-			port->current_limit = port->pps_data.op_curr;
+			port->req_supply_voltage = port->pps_data.out_volt;
+			port->req_current_limit = port->pps_data.op_curr;
 			tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
 			break;
 		case SOFT_RESET_SEND:

@@ -3195,8 +3198,8 @@ static int tcpm_pd_build_request(struct tcpm_port *port, u32 *rdo)
 			 flags & RDO_CAP_MISMATCH ? " [mismatch]" : "");
 	}
 
-	port->current_limit = ma;
-	port->supply_voltage = mv;
+	port->req_current_limit = ma;
+	port->req_supply_voltage = mv;
 
 	return 0;
 }