linux-kernel - [PATCH v4] usb: ohci: add check for host controller functional states

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Date:   Mon, 11 Oct 2021 21:02:58 +0800
From:   Yinbo Zhu <zhuyinbo@...ngson.cn>
To:     Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <greg@...ah.com>,
        Patchwork Bot <patchwork-bot@...nel.org>
Cc:     zhuyinbo@...ngson.cn
Subject: [PATCH v4] usb: ohci: add check for host controller functional states

The usb states of ohci controller include UsbOperational, UsbReset,
UsbSuspend and UsbResume. Among them, only the UsbOperational state
supports launching the start of frame for host controller according
the ohci protocol spec, but in S3 and S4 (suspend to memory/suspend
to disk) press test procedure, it may happen that the start of
frame was launched in other usb states and cause ohci works failed,
that the phenomenon was hc will allways reproduce the SoF interrupt
and consider that hc doesn't deal with the ed/td/done list in non-
UsbOperational, and this patch was to add check for host controller
functional states and if it is not UsbOperational state that need
set INTR_SF in intrdisable register to ensure SOF Token generation
was been disabled so that it can fix ohci SoF abnormally interrupt.

Signed-off-by: Yinbo Zhu <zhuyinbo@...ngson.cn>
---
Change in v4:
		Rework the commit log information.
		Remove the extra unnecessary blank line. 

 drivers/usb/host/ohci-hcd.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 1f5e693..4fd59fa 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -879,7 +879,7 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd)
 {
 	struct ohci_hcd		*ohci = hcd_to_ohci (hcd);
 	struct ohci_regs __iomem *regs = ohci->regs;
-	int			ints;
+	int			ints, ctl;

 	/* Read interrupt status (and flush pending writes).  We ignore the
 	 * optimization of checking the LSB of hcca->done_head; it doesn't
@@ -969,9 +969,14 @@ static irqreturn_t ohci_irq (struct usb_hcd *hcd)
 	 * when there's still unlinking to be done (next frame).
 	 */
 	ohci_work(ohci);
-	if ((ints & OHCI_INTR_SF) != 0 && !ohci->ed_rm_list
-			&& ohci->rh_state == OHCI_RH_RUNNING)
+
+	ctl = ohci_readl(ohci, &regs->control);
+	if (((ints & OHCI_INTR_SF) != 0 && !ohci->ed_rm_list
+			&& ohci->rh_state == OHCI_RH_RUNNING) ||
+			((ctl & OHCI_CTRL_HCFS) != OHCI_USB_OPER)) {
 		ohci_writel (ohci, OHCI_INTR_SF, &regs->intrdisable);
+		(void)ohci_readl(ohci, &regs->intrdisable);
+	}

 	if (ohci->rh_state == OHCI_RH_RUNNING) {
 		ohci_writel (ohci, ints, &regs->intrstatus);
-- 
1.8.3.1