linux-kernel - Re: [PATCH] usb: dwc2: hcd: fix periodic transfer schedule sequence

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Date:	Tue, 17 Nov 2015 06:41:17 +0800
From:	Caesar Wang <caesar.upstream@...il.com>
To:	Yunzhi Li <lyz@...k-chips.com>
CC:	John.Youn@...opsys.com, dianders@...omium.org, jwerner@...gle.com,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	wulf@...k-chips.com, kever.yang@...k-chips.com,
	frank.wang@...k-chips.com, huangtao@...k-chips.com
Subject: Re: [PATCH] usb: dwc2: hcd: fix periodic transfer schedule sequence

Hi,

在 2015年11月16日 23:25, Yunzhi Li 写道:
> When checking dwc2 host channel interrupts, handle qh in
> periodic_sched_queued list at first, then we could make sure CSPLIT
> packets scheduled in the same order as SSPLIT packets.
>
> Signed-off-by: Yunzhi Li <lyz@...k-chips.com>

This patch can fix some usb issues on my hand machine.

Says:
(1) The usb hub can't normal work (KB, mouse ...) when SB 
headset/Speaker is connected to USB2.0 travel HUB.
(2)  The music have the wonder noise when we are use some usb speak.
......

So, you can free add my test tag:

Tested-by: Caesar Wang <wxt@...k-chips.com>

> ---
>   drivers/usb/dwc2/hcd_intr.c | 22 ++++++++++++++++++++++
>   1 file changed, 22 insertions(+)
>
> diff --git a/drivers/usb/dwc2/hcd_intr.c b/drivers/usb/dwc2/hcd_intr.c
> index bda0b21..e8e8970 100644
> --- a/drivers/usb/dwc2/hcd_intr.c
> +++ b/drivers/usb/dwc2/hcd_intr.c
> @@ -2115,6 +2115,8 @@ static void dwc2_hc_intr(struct dwc2_hsotg *hsotg)
>   {
>   	u32 haint;
>   	int i;
> +	int hc_num;
> +	struct dwc2_qh *qh, *qh_tmp;
>   
>   	haint = dwc2_readl(hsotg->regs + HAINT);
>   	if (dbg_perio()) {
> @@ -2123,6 +2125,26 @@ static void dwc2_hc_intr(struct dwc2_hsotg *hsotg)
>   		dev_vdbg(hsotg->dev, "HAINT=%08x\n", haint);
>   	}
>   
> +	/*
> +	 * According to USB 2.0 spec section 11.18.8, a host must
> +	 * issue complete-split transactions in a microframe for a
> +	 * set of full-/low-speed endpoints in the same relative
> +	 * order as the start-splits were issued in a microframe for.
> +	 * So here we should at first picking up host channels
> +	 * from periodic_sched_queued list and checking if there is
> +	 * any start-split have already finished then schedule
> +	 * complete-split in the same order.
> +	 */
> +	list_for_each_entry_safe(qh, qh_tmp,
> +				 &hsotg->periodic_sched_queued,
> +				 qh_list_entry) {
> +		hc_num = qh->channel->hc_num;
> +		if (haint & (1 << hc_num)) {
> +			dwc2_hc_n_intr(hsotg, hc_num);
> +			haint &= ~(1 << hc_num);
> +		}
> +	}
> +
>   	for (i = 0; i < hsotg->core_params->host_channels; i++) {
>   		if (haint & (1 << i))
>   			dwc2_hc_n_intr(hsotg, i);
--
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