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Message-ID: <20240804084612.2561230-1-kyletso@google.com>
Date: Sun, 4 Aug 2024 16:46:12 +0800
From: Kyle Tso <kyletso@...gle.com>
To: Thinh.Nguyen@...opsys.com, gregkh@...uxfoundation.org, raychi@...gle.com
Cc: badhri@...gle.com, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
royluo@...gle.com, bvanassche@....org, Kyle Tso <kyletso@...gle.com>,
stable@...r.kernel.org
Subject: [PATCH v3] usb: dwc3: Runtime get and put usb power_supply handle
It is possible that the usb power_supply is registered after the probe
of dwc3. In this case, trying to get the usb power_supply during the
probe will fail and there is no chance to try again. Also the usb
power_supply might be unregistered at anytime so that the handle of it
in dwc3 would become invalid. To fix this, get the handle right before
calling to power_supply functions and put it afterward.
dwc3_gadet_vbus_draw might be in interrupt context. Create a kthread
worker beforehand and use it to process the "might-sleep"
power_supply_put ASAP after the property set.
Fixes: 6f0764b5adea ("usb: dwc3: add a power supply for current control")
Cc: stable@...r.kernel.org
Signed-off-by: Kyle Tso <kyletso@...gle.com>
---
v2 -> v3:
- Only move power_supply_put to a work. Still call _get_by_name and
_set_property in dwc3_gadget_vbus_draw.
- Create a kthread_worker to handle the work
v1 -> v2:
- move power_supply_put out of interrupt context
drivers/usb/dwc3/core.c | 29 ++++++++++++----------------
drivers/usb/dwc3/core.h | 6 ++++--
drivers/usb/dwc3/gadget.c | 40 +++++++++++++++++++++++++++++++++++----
3 files changed, 52 insertions(+), 23 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 734de2a8bd21..82c8376330d7 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1631,8 +1631,6 @@ 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;
@@ -1667,12 +1665,7 @@ static void dwc3_get_properties(struct dwc3 *dwc)
dwc->sys_wakeup = device_may_wakeup(dwc->sysdev);
- 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");
- }
+ device_property_read_string(dev, "usb-psy-name", &dwc->usb_psy_name);
dwc->has_lpm_erratum = device_property_read_bool(dev,
"snps,has-lpm-erratum");
@@ -2132,19 +2125,24 @@ static int dwc3_probe(struct platform_device *pdev)
dwc3_get_software_properties(dwc);
+ dwc->worker = kthread_create_worker(0, "dwc3-worker");
+ if (IS_ERR(dwc->worker))
+ return PTR_ERR(dwc->worker);
+ sched_set_fifo(dwc->worker->task);
+
dwc->reset = devm_reset_control_array_get_optional_shared(dev);
if (IS_ERR(dwc->reset)) {
ret = PTR_ERR(dwc->reset);
- goto err_put_psy;
+ goto err_destroy_worker;
}
ret = dwc3_get_clocks(dwc);
if (ret)
- goto err_put_psy;
+ goto err_destroy_worker;
ret = reset_control_deassert(dwc->reset);
if (ret)
- goto err_put_psy;
+ goto err_destroy_worker;
ret = dwc3_clk_enable(dwc);
if (ret)
@@ -2245,9 +2243,8 @@ static int dwc3_probe(struct platform_device *pdev)
dwc3_clk_disable(dwc);
err_assert_reset:
reset_control_assert(dwc->reset);
-err_put_psy:
- if (dwc->usb_psy)
- power_supply_put(dwc->usb_psy);
+err_destroy_worker:
+ kthread_destroy_worker(dwc->worker);
return ret;
}
@@ -2258,6 +2255,7 @@ static void dwc3_remove(struct platform_device *pdev)
pm_runtime_get_sync(&pdev->dev);
+ kthread_destroy_worker(dwc->worker);
dwc3_core_exit_mode(dwc);
dwc3_debugfs_exit(dwc);
@@ -2276,9 +2274,6 @@ static void dwc3_remove(struct platform_device *pdev)
pm_runtime_set_suspended(&pdev->dev);
dwc3_free_event_buffers(dwc);
-
- if (dwc->usb_psy)
- power_supply_put(dwc->usb_psy);
}
#ifdef CONFIG_PM
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 1e561fd8b86e..3fc58204db6e 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -993,6 +993,7 @@ struct dwc3_scratchpad_array {
/**
* struct dwc3 - representation of our controller
* @drd_work: workqueue used for role swapping
+ * @worker: dedicated kthread worker
* @ep0_trb: trb which is used for the ctrl_req
* @bounce: address of bounce buffer
* @setup_buf: used while precessing STD USB requests
@@ -1045,7 +1046,7 @@ struct dwc3_scratchpad_array {
* @role_sw: usb_role_switch handle
* @role_switch_default_mode: default operation mode of controller while
* usb role is USB_ROLE_NONE.
- * @usb_psy: pointer to power supply interface.
+ * @usb_psy_name: name of the usb power supply interface
* @usb2_phy: pointer to USB2 PHY
* @usb3_phy: pointer to USB3 PHY
* @usb2_generic_phy: pointer to array of USB2 PHYs
@@ -1163,6 +1164,7 @@ struct dwc3_scratchpad_array {
*/
struct dwc3 {
struct work_struct drd_work;
+ struct kthread_worker *worker;
struct dwc3_trb *ep0_trb;
void *bounce;
u8 *setup_buf;
@@ -1223,7 +1225,7 @@ struct dwc3 {
struct usb_role_switch *role_sw;
enum usb_dr_mode role_switch_default_mode;
- struct power_supply *usb_psy;
+ const char *usb_psy_name;
u32 fladj;
u32 ref_clk_per;
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 89fc690fdf34..1ff583281eff 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -30,6 +30,11 @@
#define DWC3_ALIGN_FRAME(d, n) (((d)->frame_number + ((d)->interval * (n))) \
& ~((d)->interval - 1))
+struct dwc3_psy_put {
+ struct kthread_work work;
+ struct power_supply *psy;
+};
+
/**
* dwc3_gadget_set_test_mode - enables usb2 test modes
* @dwc: pointer to our context structure
@@ -3047,22 +3052,49 @@ static void dwc3_gadget_set_ssp_rate(struct usb_gadget *g,
spin_unlock_irqrestore(&dwc->lock, flags);
}
+static void dwc3_gadget_psy_put(struct kthread_work *work)
+{
+ struct dwc3_psy_put *psy_put = container_of(work, struct dwc3_psy_put, work);
+
+ power_supply_put(psy_put->psy);
+ kfree(psy_put);
+}
+
static int dwc3_gadget_vbus_draw(struct usb_gadget *g, unsigned int mA)
{
- struct dwc3 *dwc = gadget_to_dwc(g);
+ struct dwc3 *dwc = gadget_to_dwc(g);
+ struct power_supply *usb_psy;
union power_supply_propval val = {0};
+ struct dwc3_psy_put *psy_put;
int ret;
if (dwc->usb2_phy)
return usb_phy_set_power(dwc->usb2_phy, mA);
- if (!dwc->usb_psy)
+ if (!dwc->usb_psy_name)
return -EOPNOTSUPP;
+ usb_psy = power_supply_get_by_name(dwc->usb_psy_name);
+ if (!usb_psy) {
+ dev_err(dwc->dev, "couldn't get usb power supply\n");
+ return -ENODEV;
+ }
+
val.intval = 1000 * mA;
- ret = power_supply_set_property(dwc->usb_psy, POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);
+ ret = power_supply_set_property(usb_psy, POWER_SUPPLY_PROP_INPUT_CURRENT_LIMIT, &val);
+ if (ret < 0) {
+ dev_err(dwc->dev, "failed to set power supply property\n");
+ return ret;
+ }
- return ret;
+ psy_put = kzalloc(sizeof(*psy_put), GFP_ATOMIC);
+ if (!psy_put)
+ return -ENOMEM;
+ kthread_init_work(&psy_put->work, dwc3_gadget_psy_put);
+ psy_put->psy = usb_psy;
+ kthread_queue_work(dwc->worker, &psy_put->work);
+
+ return 0;
}
/**
--
2.46.0.rc2.264.g509ed76dc8-goog
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