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BACKPORT: usb: dwc3: fix gadget mode suspend interrupt handler issue

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When work in gadget mode, currently driver doesn't update software level
link_state correctly as link state change event is not enabled for most
devices, in function dwc3_gadget_suspend_interrupt(), it will only pass
suspend event to UDC core when software level link state changes, so when
interrupt generated in sequences of suspend -> reset -> conndone ->
suspend, link state is not updated during reset and conndone, so second
suspend interrupt event will not pass to UDC core.

Remove link_state compare in dwc3_gadget_suspend_interrupt() and add a
suspended flag to replace the compare function.

Fixes: 799e9dc829 ("usb: dwc3: gadget: conditionally disable Link State change events")
Cc: stable <stable@kernel.org>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Linyu Yuan <quic_linyyuan@quicinc.com>
Link: https://lore.kernel.org/r/20230512004524.31950-1-quic_linyyuan@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 283221152
(cherry picked from commit 4e8ef34e36
https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git/ usb-linus)
[prashk: Didn't add suspended flag in dwc3_gadget_func_wakeup() & dwc3_gadget_linksts_change_interrupt()]
Signed-off-by: Prashanth K <quic_prashk@quicinc.com>
Change-Id: Iaaf34456136e873f1ce5a8fa573f40e22873f2c4
This commit is contained in:
Prashanth K
2023-05-24 11:21:36 +05:30
committed by Todd Kjos
parent 364def466a
commit 751bcb9de0
2 changed files with 12 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/usb/dwc3/core.h
View File

@@ -1110,6 +1110,7 @@ struct dwc3_scratchpad_array {
* 3 - Reserved
* @dis_metastability_quirk: set to disable metastability quirk.
* @dis_split_quirk: set to disable split boundary.
* @suspended: set to track suspend event due to U3/L2.
* @imod_interval: set the interrupt moderation interval in 250ns
* increments or 0 to disable.
* @max_cfg_eps: current max number of IN eps used across all USB configs.
@@ -1327,6 +1328,7 @@ struct dwc3 {
unsigned dis_split_quirk:1;
unsigned async_callbacks:1;
unsigned suspended:1;
u16 imod_interval;

11
drivers/usb/dwc3/gadget.c
View File

@@ -3835,6 +3835,8 @@ static void dwc3_gadget_disconnect_interrupt(struct dwc3 *dwc)
{
int reg;
dwc->suspended = false;
dwc3_gadget_set_link_state(dwc, DWC3_LINK_STATE_RX_DET);
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
@@ -3857,6 +3859,8 @@ static void dwc3_gadget_reset_interrupt(struct dwc3 *dwc)
{
u32 reg;
dwc->suspended = false;
/*
* Ideally, dwc3_reset_gadget() would trigger the function
* drivers to stop any active transfers through ep disable.
@@ -4073,6 +4077,9 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc)
{
dwc->suspended = false;
/*
* TODO take core out of low power mode when that's
* implemented.
@@ -4188,8 +4195,10 @@ static void dwc3_gadget_suspend_interrupt(struct dwc3 *dwc,
{
enum dwc3_link_state next = evtinfo & DWC3_LINK_STATE_MASK;
if (dwc->link_state != next && next == DWC3_LINK_STATE_U3)
if (!dwc->suspended && next == DWC3_LINK_STATE_U3) {
dwc->suspended = true;
dwc3_suspend_gadget(dwc);
}
dwc->link_state = next;
}