linux-kernel - [PATCH v1 1/2] usb: dwc3: Refactor usb-psy init

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Date: Sat, 16 Dec 2023 03:43:34 +0000
From: Badhri Jagan Sridharan <badhri@...gle.com>
To: Thinh.Nguyen@...opsys.com, gregkh@...uxfoundation.org, raychi@...gle.com, 
	royluo@...gle.com
Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Badhri Jagan Sridharan <badhri@...gle.com>, stable@...r.kernel.org
Subject: [PATCH v1 1/2] usb: dwc3: Refactor usb-psy init

Move usb-psy init to dwc3_populate_usb_psy() so that gadget can re-use
it to retry setting up usb-psy when null.

Cc: stable@...r.kernel.org
Fixes: 6f0764b5adea ("usb: dwc3: add a power supply for current control")
Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
---
 drivers/usb/dwc3/core.c | 24 ++++++++++++++++--------
 drivers/usb/dwc3/core.h |  1 +
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index b101dbf8c5dc..a93425b9c1c0 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1495,6 +1495,19 @@ static void dwc3_core_exit_mode(struct dwc3 *dwc)
 	dwc3_set_prtcap(dwc, DWC3_GCTL_PRTCAP_DEVICE);
 }
 
+void dwc3_populate_usb_psy(struct dwc3 *dwc)
+{
+	const char *usb_psy_name;
+	int ret;
+
+	if (dwc->usb_psy)
+		return;
+
+	ret = device_property_read_string(dwc->dev, "usb-psy-name", &usb_psy_name);
+	if (ret >= 0)
+		dwc->usb_psy = power_supply_get_by_name(usb_psy_name);
+}
+
 static void dwc3_get_properties(struct dwc3 *dwc)
 {
 	struct device		*dev = dwc->dev;
@@ -1510,8 +1523,6 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 	u8			tx_thr_num_pkt_prd = 0;
 	u8			tx_max_burst_prd = 0;
 	u8			tx_fifo_resize_max_num;
-	const char		*usb_psy_name;
-	int			ret;
 
 	/* default to highest possible threshold */
 	lpm_nyet_threshold = 0xf;
@@ -1544,12 +1555,9 @@ static void dwc3_get_properties(struct dwc3 *dwc)
 	else
 		dwc->sysdev = dwc->dev;
 
-	ret = device_property_read_string(dev, "usb-psy-name", &usb_psy_name);
-	if (ret >= 0) {
-		dwc->usb_psy = power_supply_get_by_name(usb_psy_name);
-		if (!dwc->usb_psy)
-			dev_err(dev, "couldn't get usb power supply\n");
-	}
+	dwc3_populate_usb_psy(dwc);
+	if (!dwc->usb_psy)
+		dev_err(dev, "couldn't get usb power supply\n");
 
 	dwc->has_lpm_erratum = device_property_read_bool(dev,
 				"snps,has-lpm-erratum");
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index efe6caf4d0e8..6c65d76e6fe2 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1526,6 +1526,7 @@ struct dwc3_gadget_ep_cmd_params {
 void dwc3_set_prtcap(struct dwc3 *dwc, u32 mode);
 void dwc3_set_mode(struct dwc3 *dwc, u32 mode);
 u32 dwc3_core_fifo_space(struct dwc3_ep *dep, u8 type);
+void dwc3_populate_usb_psy(struct dwc3 *dwc);
 
 #define DWC3_IP_IS(_ip)							\
 	(dwc->ip == _ip##_IP)

base-commit: 51920207674e9e3475a91d2091583889792df99a
-- 
2.43.0.472.g3155946c3a-goog