Re: [PATCH v9] usb: dwc3: fix gadget mode suspend interrupt handler issue

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On Thu, May 11, 2023, Linyu Yuan wrote:
> 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: 6f26ebb79a84 ("usb: dwc3: gadget: Rename EOPF event macros to Suspend")

That change is unrelated to what this fixes. Change to this:

Fixes: 799e9dc82968 ("usb: dwc3: gadget: conditionally disable Link State change events")

Thanks,
Thinh

> Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
> Signed-off-by: Linyu Yuan <quic_linyyuan@xxxxxxxxxxx>
> ---
> 
> v9: (refer v8 https://urldefense.com/v3/__https://lore.kernel.org/linux-usb/20230510014718.13872-1-quic_linyyuan@xxxxxxxxxxx/__;!!A4F2R9G_pg!fXFLPApL2C4HhrxpqTxcoAHO1ze8zfNE4AuzweO-KJw9EbeP1cBbHII8xLUdcpCgIHivCp_GAiFNyRVQSYNpJczpAuIfoA$ )
> 1) add a Fixes tag
> 2) add Acked-by tag from Thinh
> 
> v8: (refer v7 https://urldefense.com/v3/__https://lore.kernel.org/linux-usb/20230509050743.5781-1-quic_linyyuan@xxxxxxxxxxx/__;!!A4F2R9G_pg!fXFLPApL2C4HhrxpqTxcoAHO1ze8zfNE4AuzweO-KJw9EbeP1cBbHII8xLUdcpCgIHivCp_GAiFNyRVQSYNpJczy3KrvGg$ )
> 1) move some suspended flag clear to specific event handler
> 
> v7: (refer v6 https://urldefense.com/v3/__https://lore.kernel.org/linux-usb/20230505014902.27313-1-quic_linyyuan@xxxxxxxxxxx/__;!!A4F2R9G_pg!fXFLPApL2C4HhrxpqTxcoAHO1ze8zfNE4AuzweO-KJw9EbeP1cBbHII8xLUdcpCgIHivCp_GAiFNyRVQSYNpJcxpYUi6EA$ )
> 1) reword suspended flag comment
> 2) remove one extra space in if operation
> 4) clear suspended flag for wakeup/reset/disconnect interrupt
> 3) clear suspended flag for remote wakeup related case.
> 
> v6: (refer v5 https://urldefense.com/v3/__https://lore.kernel.org/linux-usb/1682476780-2367-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/__;!!A4F2R9G_pg!fXFLPApL2C4HhrxpqTxcoAHO1ze8zfNE4AuzweO-KJw9EbeP1cBbHII8xLUdcpCgIHivCp_GAiFNyRVQSYNpJcx4sSbscA$ )
> 1) change subject
> 2) only keep suspended flag related change
> 
> v5: (refer v4 https://urldefense.com/v3/__https://lore.kernel.org/linux-usb/1682393256-15572-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/__;!!A4F2R9G_pg!fXFLPApL2C4HhrxpqTxcoAHO1ze8zfNE4AuzweO-KJw9EbeP1cBbHII8xLUdcpCgIHivCp_GAiFNyRVQSYNpJczljSAAXQ$ )
> 1) rename suspend_irq_happen to suspended and document it
> 2) add old_link_state for link change interrupt usage and change accordingly
> 
> v4: (refer v3 https://urldefense.com/v3/__https://lore.kernel.org/linux-usb/1682053861-21737-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/__;!!A4F2R9G_pg!fXFLPApL2C4HhrxpqTxcoAHO1ze8zfNE4AuzweO-KJw9EbeP1cBbHII8xLUdcpCgIHivCp_GAiFNyRVQSYNpJcxgG00LTA$ )
> 1) remove link state checking in dwc3_gadget_wakeup_interrupt()
> 2) remove two switch/case to if opeartion
> 
> v3: (refer v2 https://urldefense.com/v3/__https://lore.kernel.org/linux-usb/1682042472-21222-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/__;!!A4F2R9G_pg!fXFLPApL2C4HhrxpqTxcoAHO1ze8zfNE4AuzweO-KJw9EbeP1cBbHII8xLUdcpCgIHivCp_GAiFNyRVQSYNpJcyY04T_6w$ )
> no code change since v2, changes compare v1 as below,
> 1) add a flag suspend_irq_happen to simplify dwc3_gadget_suspend_interrupt(),
>    it will avoid refer to software level link_state, finally link_state will
>    only used in dwc3_gadget_linksts_change_interrupt().
> 2) remove sw setting of link_state in dwc3_gadget_func_wakeup()
> 3) add dwc3_gadget_interrupt_early() to correct setting of link_state
>    and suspend_irq_happen.
> 
> v2: update according v1 discussion
> v1: https://urldefense.com/v3/__https://lore.kernel.org/linux-usb/1675221286-23833-1-git-send-email-quic_linyyuan@xxxxxxxxxxx/__;!!A4F2R9G_pg!fXFLPApL2C4HhrxpqTxcoAHO1ze8zfNE4AuzweO-KJw9EbeP1cBbHII8xLUdcpCgIHivCp_GAiFNyRVQSYNpJcwl52Uxdg$ 
> 
>  drivers/usb/dwc3/core.h   |  2 ++
>  drivers/usb/dwc3/gadget.c | 12 +++++++++++-
>  2 files changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index d56457c02996..1f043c31a096 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -1116,6 +1116,7 @@ struct dwc3_scratchpad_array {
>   * @dis_metastability_quirk: set to disable metastability quirk.
>   * @dis_split_quirk: set to disable split boundary.
>   * @wakeup_configured: set if the device is configured for remote wakeup.
> + * @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.
> @@ -1332,6 +1333,7 @@ struct dwc3 {
>  	unsigned		dis_split_quirk:1;
>  	unsigned		async_callbacks:1;
>  	unsigned		wakeup_configured:1;
> +	unsigned		suspended:1;
>  
>  	u16			imod_interval;
>  
> diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
> index c0ca4d12f95d..f244bebf1ea0 100644
> --- a/drivers/usb/dwc3/gadget.c
> +++ b/drivers/usb/dwc3/gadget.c
> @@ -2440,6 +2440,7 @@ static int dwc3_gadget_func_wakeup(struct usb_gadget *g, int intf_id)
>  			return -EINVAL;
>  		}
>  		dwc3_resume_gadget(dwc);
> +		dwc->suspended = false;
>  		dwc->link_state = DWC3_LINK_STATE_U0;
>  	}
>  
> @@ -3938,6 +3939,8 @@ 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);
> @@ -3962,6 +3965,8 @@ 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.
> @@ -4180,6 +4185,8 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
>  
>  static void dwc3_gadget_wakeup_interrupt(struct dwc3 *dwc, unsigned int evtinfo)
>  {
> +	dwc->suspended = false;
> +
>  	/*
>  	 * TODO take core out of low power mode when that's
>  	 * implemented.
> @@ -4277,6 +4284,7 @@ static void dwc3_gadget_linksts_change_interrupt(struct dwc3 *dwc,
>  		if (dwc->gadget->wakeup_armed) {
>  			dwc3_gadget_enable_linksts_evts(dwc, false);
>  			dwc3_resume_gadget(dwc);
> +			dwc->suspended = false;
>  		}
>  		break;
>  	case DWC3_LINK_STATE_U1:
> @@ -4303,8 +4311,10 @@ 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;
>  }
> -- 
> 2.17.1
> 




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