4.19-stable review patch. If anyone has any objections, please let me know.
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From: Selvarasu Ganesan selvarasu.g@samsung.com
[ Upstream commit 0d410e8913f5cffebcca79ffdd596009d4a13a28 ]
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@kernel.org Signed-off-by: Selvarasu Ganesan selvarasu.g@samsung.com Suggested-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Acked-by: Thinh Nguyen Thinh.Nguyen@synopsys.com Link: https://lore.kernel.org/r/20240916231813.206-1-selvarasu.g@samsung.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c index f50b8bf22356b..c10306234bb11 100644 --- a/drivers/usb/dwc3/core.c +++ b/drivers/usb/dwc3/core.c @@ -404,6 +404,7 @@ static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned length) int dwc3_event_buffers_setup(struct dwc3 *dwc) { struct dwc3_event_buffer *evt; + u32 reg;
if (!dwc->ev_buf) return 0; @@ -416,8 +417,10 @@ int dwc3_event_buffers_setup(struct dwc3 *dwc) 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; }
@@ -444,7 +447,10 @@ void dwc3_event_buffers_cleanup(struct dwc3 *dwc) 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) @@ -1792,7 +1798,11 @@ static int dwc3_runtime_resume(struct device *dev)
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: @@ -1879,6 +1889,12 @@ static void dwc3_complete(struct device *dev) 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) }; diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 7f8804e9e74c3..1115ed88f3571 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -1430,7 +1430,6 @@ static inline void dwc3_otg_host_init(struct dwc3 *dwc) #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) { @@ -1442,9 +1441,6 @@ static inline int dwc3_gadget_resume(struct dwc3 *dwc) 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) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index e617a28aca436..c6610c15e03ed 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -3474,14 +3474,3 @@ int dwc3_gadget_resume(struct dwc3 *dwc) 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); - } -}