5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Selvarasu Ganesan <selvarasu.g@xxxxxxxxxxx>
commit 0d410e8913f5cffebcca79ffdd596009d4a13a28 upstream.
This commit addresses an issue where events were being processed when
the controller was in a halted state. To fix this issue by stop
processing the events as the event count was considered stale or
invalid when the controller was halted.
Fixes: fc8bb91bc83e ("usb: dwc3: implement runtime PM")
Cc: stable@xxxxxxxxxx
Signed-off-by: Selvarasu Ganesan <selvarasu.g@xxxxxxxxxxx>
Suggested-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240916231813.206-1-selvarasu.g@xxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/core.c | 22 +++++++++++++++++++---
drivers/usb/dwc3/core.h | 4 ----
drivers/usb/dwc3/gadget.c | 11 -----------
3 files changed, 19 insertions(+), 18 deletions(-)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -418,6 +418,7 @@ static int dwc3_alloc_event_buffers(stru
int dwc3_event_buffers_setup(struct dwc3 *dwc)
{
struct dwc3_event_buffer *evt;
+ u32 reg;
if (!dwc->ev_buf)
return 0;
@@ -430,8 +431,10 @@ int dwc3_event_buffers_setup(struct dwc3
upper_32_bits(evt->dma));
dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0),
DWC3_GEVNTSIZ_SIZE(evt->length));
- dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0);
+ /* Clear any stale event */
+ reg = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));
+ dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), reg);
return 0;
}
@@ -458,7 +461,10 @@ void dwc3_event_buffers_cleanup(struct d
dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(0), 0);
dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(0), DWC3_GEVNTSIZ_INTMASK
| DWC3_GEVNTSIZ_SIZE(0));
- dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), 0);
+
+ /* Clear any stale event */
+ reg = dwc3_readl(dwc->regs, DWC3_GEVNTCOUNT(0));
+ dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(0), reg);
}
static int dwc3_alloc_scratch_buffers(struct dwc3 *dwc)
@@ -1799,7 +1805,11 @@ static int dwc3_runtime_resume(struct de
switch (dwc->current_dr_role) {
case DWC3_GCTL_PRTCAP_DEVICE:
- dwc3_gadget_process_pending_events(dwc);
+ if (dwc->pending_events) {
+ pm_runtime_put(dwc->dev);
+ dwc->pending_events = false;
+ enable_irq(dwc->irq_gadget);
+ }
break;
case DWC3_GCTL_PRTCAP_HOST:
default:
@@ -1886,6 +1896,12 @@ static void dwc3_complete(struct device
static const struct dev_pm_ops dwc3_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(dwc3_suspend, dwc3_resume)
.complete = dwc3_complete,
+
+ /*
+ * Runtime suspend halts the controller on disconnection. It relies on
+ * platforms with custom connection notification to start the controller
+ * again.
+ */
SET_RUNTIME_PM_OPS(dwc3_runtime_suspend, dwc3_runtime_resume,
dwc3_runtime_idle)
};
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -1487,7 +1487,6 @@ static inline void dwc3_otg_host_init(st
#if !IS_ENABLED(CONFIG_USB_DWC3_HOST)
int dwc3_gadget_suspend(struct dwc3 *dwc);
int dwc3_gadget_resume(struct dwc3 *dwc);
-void dwc3_gadget_process_pending_events(struct dwc3 *dwc);
#else
static inline int dwc3_gadget_suspend(struct dwc3 *dwc)
{
@@ -1499,9 +1498,6 @@ static inline int dwc3_gadget_resume(str
return 0;
}
-static inline void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
-{
-}
#endif /* !IS_ENABLED(CONFIG_USB_DWC3_HOST) */
#if IS_ENABLED(CONFIG_USB_DWC3_ULPI)
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -3827,14 +3827,3 @@ err1:
err0:
return ret;
}
-
-void dwc3_gadget_process_pending_events(struct dwc3 *dwc)
-{
- if (dwc->pending_events) {
- dwc3_interrupt(dwc->irq_gadget, dwc->ev_buf);
- dwc3_thread_interrupt(dwc->irq_gadget, dwc->ev_buf);
- pm_runtime_put(dwc->dev);
- dwc->pending_events = false;
- enable_irq(dwc->irq_gadget);
- }
-}
