* [PATCH v4] usb: ohci: add check for host controller functional states
@ 2021-10-11 13:02 Yinbo Zhu
2021-12-20 15:59 ` Greg Kroah-Hartman
0 siblings, 1 reply; 3+ messages in thread
From: Yinbo Zhu @ 2021-10-11 13:02 UTC (permalink / raw)
To: Alan Stern, Greg Kroah-Hartman, linux-usb, linux-kernel,
Greg Kroah-Hartman, Patchwork Bot
Cc: zhuyinbo
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@loongson.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, ®s->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, ®s->intrdisable);
+ (void)ohci_readl(ohci, ®s->intrdisable);
+ }
if (ohci->rh_state == OHCI_RH_RUNNING) {
ohci_writel (ohci, ints, ®s->intrstatus);
--
1.8.3.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v4] usb: ohci: add check for host controller functional states
2021-10-11 13:02 [PATCH v4] usb: ohci: add check for host controller functional states Yinbo Zhu
@ 2021-12-20 15:59 ` Greg Kroah-Hartman
2021-12-20 21:35 ` Alan Stern
0 siblings, 1 reply; 3+ messages in thread
From: Greg Kroah-Hartman @ 2021-12-20 15:59 UTC (permalink / raw)
To: Yinbo Zhu; +Cc: Alan Stern, linux-usb, linux-kernel, Patchwork Bot
On Mon, Oct 11, 2021 at 09:02:58PM +0800, Yinbo Zhu wrote:
> 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.
I do not understand this change. What commit is this fixing? What
devices today do not work with the code as-is?
>
> Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.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;
New line for a new variable please.
>
> /* 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, ®s->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, ®s->intrdisable);
> + (void)ohci_readl(ohci, ®s->intrdisable);
No need for (void).
thanks,
greg k-h
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH v4] usb: ohci: add check for host controller functional states
2021-12-20 15:59 ` Greg Kroah-Hartman
@ 2021-12-20 21:35 ` Alan Stern
0 siblings, 0 replies; 3+ messages in thread
From: Alan Stern @ 2021-12-20 21:35 UTC (permalink / raw)
To: Greg Kroah-Hartman; +Cc: Yinbo Zhu, linux-usb, linux-kernel, Patchwork Bot
On Mon, Dec 20, 2021 at 04:59:13PM +0100, Greg Kroah-Hartman wrote:
> On Mon, Oct 11, 2021 at 09:02:58PM +0800, Yinbo Zhu wrote:
> > 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.
>
> I do not understand this change. What commit is this fixing? What
> devices today do not work with the code as-is?
>
> >
> > Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.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;
>
> New line for a new variable please.
>
> >
> > /* 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, ®s->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, ®s->intrdisable);
> > + (void)ohci_readl(ohci, ®s->intrdisable);
>
> No need for (void).
Greg:
I didn't reply to v4 of this patch because the OP never responded to my
request regarding v3. See
https://lore.kernel.org/linux-usb/20211011161732.GA822456@rowland.harvard.edu/
Alan Stern
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-12-20 15:59 ` Greg Kroah-Hartman
2021-12-20 21:35 ` Alan Stern
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