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Subject[PATCH v10 12/15] usb: typec: tcpm: Parse frs type-c current from device tree
From
New source's current capability is now defined as string based
device tree property through new-source-frs-typec-current.
Refactor tcpm code to parse new-source-frs-typec-current and
infer local port's new source current capability during frs.

Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
---
v9 is the first version of this patch in this series to rebase
TCPM code to read new source frs current from
new-source-frs-typec-current. No changes since v9.
---
drivers/usb/typec/tcpm/tcpm.c | 41 +++++++++++++++++++----------------
include/linux/usb/typec.h | 12 ++++++++++
2 files changed, 34 insertions(+), 19 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 02b7f623f584..d5a3e2b3bea2 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -180,16 +180,11 @@ enum adev_actions {
ADEV_ATTENTION,
};

-/*
- * Initial current capability of the new source when vSafe5V is applied during PD3.0 Fast Role Swap.
- * Based on "Table 6-14 Fixed Supply PDO - Sink" of "USB Power Delivery Specification Revision 3.0,
- * Version 1.2"
- */
-enum frs_typec_current {
- FRS_NOT_SUPPORTED,
- FRS_DEFAULT_POWER,
- FRS_5V_1P5A,
- FRS_5V_3A,
+static const char * const typec_new_source_frs_current[] = {
+ [FRS_NOT_SUPPORTED] = "not-supported",
+ [FRS_DEFAULT_POWER] = "default",
+ [FRS_5V_1P5A] = "1.5A",
+ [FRS_5V_3A] = "3.0A",
};

/* Events from low level driver */
@@ -364,7 +359,7 @@ struct tcpm_port {
bool self_powered;

/* FRS */
- enum frs_typec_current frs_current;
+ enum typec_new_source_frs_current new_source_frs_current;

/* Sink caps have been queried */
bool sink_cap_done;
@@ -1713,7 +1708,7 @@ static void tcpm_pd_data_request(struct tcpm_port *port,
unsigned int cnt = pd_header_cnt_le(msg->header);
unsigned int rev = pd_header_rev_le(msg->header);
unsigned int i;
- enum frs_typec_current frs_current;
+ enum typec_new_source_frs_current partner_frs_current;
bool frs_enable;
int ret;

@@ -1786,12 +1781,13 @@ static void tcpm_pd_data_request(struct tcpm_port *port,
for (i = 0; i < cnt; i++)
port->sink_caps[i] = le32_to_cpu(msg->payload[i]);

- frs_current = (port->sink_caps[0] & PDO_FIXED_FRS_CURR_MASK) >>
+ partner_frs_current = (port->sink_caps[0] & PDO_FIXED_FRS_CURR_MASK) >>
PDO_FIXED_FRS_CURR_SHIFT;
- frs_enable = frs_current && (frs_current <= port->frs_current);
+ frs_enable = partner_frs_current && (partner_frs_current <=
+ port->new_source_frs_current);
tcpm_log(port,
"Port partner FRS capable partner_frs_current:%u port_frs_current:%u enable:%c",
- frs_current, port->frs_current, frs_enable ? 'y' : 'n');
+ partner_frs_current, port->new_source_frs_current, frs_enable ? 'y' : 'n');
if (frs_enable) {
ret = port->tcpc->enable_frs(port->tcpc, true);
tcpm_log(port, "Enable FRS %s, ret:%d\n", ret ? "fail" : "success", ret);
@@ -4746,7 +4742,8 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,
{
const char *cap_str;
int ret;
- u32 mw, frs_current;
+ u32 mw;
+ const char *new_source_frs_current;

if (!fwnode)
return -EINVAL;
@@ -4817,9 +4814,15 @@ static int tcpm_fw_get_caps(struct tcpm_port *port,

/* FRS can only be supported byb DRP ports */
if (port->port_type == TYPEC_PORT_DRP) {
- ret = fwnode_property_read_u32(fwnode, "frs-typec-current", &frs_current);
- if (ret >= 0 && frs_current <= FRS_5V_3A)
- port->frs_current = frs_current;
+ ret = fwnode_property_read_string(fwnode, "new-source-frs-typec-current",
+ &new_source_frs_current);
+ if (!ret) {
+ ret = match_string(typec_new_source_frs_current,
+ ARRAY_SIZE(typec_new_source_frs_current),
+ new_source_frs_current);
+ if (ret >= 0)
+ port->new_source_frs_current = ret;
+ }
}

return 0;
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index 6be558045942..3198b89fa451 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -72,6 +72,18 @@ enum typec_orientation {
TYPEC_ORIENTATION_REVERSE,
};

+/*
+ * Based on "Table 6-14 Fixed Supply PDO - Sink" of "USB Power Delivery Specification Revision 3.0,
+ * Version 1.2"
+ * Initial current capability of the new source when vSafe5V is applied.
+ */
+enum typec_new_source_frs_current {
+ FRS_NOT_SUPPORTED,
+ FRS_DEFAULT_POWER,
+ FRS_5V_1P5A,
+ FRS_5V_3A,
+};
+
/*
* struct enter_usb_data - Enter_USB Message details
* @eudo: Enter_USB Data Object
--
2.28.0.806.g8561365e88-goog
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