From: Claudiu Beznea <claudiu.beznea@microchip.com> To: <stern@rowland.harvard.edu>, <gregkh@linuxfoundation.org>, <nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>, <ludovic.desroches@microchip.com>, <cristian.birsan@microchip.com> Cc: <linux-usb@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, Claudiu Beznea <claudiu.beznea@microchip.com> Subject: [PATCH] usb: host: ohci-at91: suspend/resume ports after/before OHCI accesses Date: Wed, 9 Jun 2021 15:10:27 +0300 [thread overview] Message-ID: <20210609121027.70951-1-claudiu.beznea@microchip.com> (raw) On SAMA7G5 suspending ports will cut the access to OHCI registers and any subsequent access to them will lead to CPU being blocked trying to access that memory. Same thing happens on resume: if OHCI memory is accessed before resuming ports the CPU will block on that access. The OCHI memory is accessed on suspend/resume though ohci_suspend()/ohci_resume(). Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> --- The patch was tested on SAMA7G5, SAMA5D2 and SAM9X60. Thank you, Claudiu Beznea drivers/usb/host/ohci-at91.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c index b3a6a497dcb1..7c6202b05ff4 100644 --- a/drivers/usb/host/ohci-at91.c +++ b/drivers/usb/host/ohci-at91.c @@ -666,8 +666,6 @@ ohci_hcd_at91_drv_suspend(struct device *dev) if (ohci_at91->wakeup) enable_irq_wake(hcd->irq); - ohci_at91_port_suspend(ohci_at91, 1); - ret = ohci_suspend(hcd, ohci_at91->wakeup); if (ret) { if (ohci_at91->wakeup) @@ -687,7 +685,10 @@ ohci_hcd_at91_drv_suspend(struct device *dev) /* flush the writes */ (void) ohci_readl (ohci, &ohci->regs->control); msleep(1); + ohci_at91_port_suspend(ohci_at91, 1); at91_stop_clock(ohci_at91); + } else { + ohci_at91_port_suspend(ohci_at91, 1); } return ret; @@ -699,6 +700,8 @@ ohci_hcd_at91_drv_resume(struct device *dev) struct usb_hcd *hcd = dev_get_drvdata(dev); struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); + ohci_at91_port_suspend(ohci_at91, 0); + if (ohci_at91->wakeup) disable_irq_wake(hcd->irq); else @@ -706,8 +709,6 @@ ohci_hcd_at91_drv_resume(struct device *dev) ohci_resume(hcd, false); - ohci_at91_port_suspend(ohci_at91, 0); - return 0; } -- 2.25.1
WARNING: multiple messages have this Message-ID (diff)
From: Claudiu Beznea <claudiu.beznea@microchip.com> To: <stern@rowland.harvard.edu>, <gregkh@linuxfoundation.org>, <nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>, <ludovic.desroches@microchip.com>, <cristian.birsan@microchip.com> Cc: <linux-usb@vger.kernel.org>, <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, Claudiu Beznea <claudiu.beznea@microchip.com> Subject: [PATCH] usb: host: ohci-at91: suspend/resume ports after/before OHCI accesses Date: Wed, 9 Jun 2021 15:10:27 +0300 [thread overview] Message-ID: <20210609121027.70951-1-claudiu.beznea@microchip.com> (raw) On SAMA7G5 suspending ports will cut the access to OHCI registers and any subsequent access to them will lead to CPU being blocked trying to access that memory. Same thing happens on resume: if OHCI memory is accessed before resuming ports the CPU will block on that access. The OCHI memory is accessed on suspend/resume though ohci_suspend()/ohci_resume(). Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com> --- The patch was tested on SAMA7G5, SAMA5D2 and SAM9X60. Thank you, Claudiu Beznea drivers/usb/host/ohci-at91.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c index b3a6a497dcb1..7c6202b05ff4 100644 --- a/drivers/usb/host/ohci-at91.c +++ b/drivers/usb/host/ohci-at91.c @@ -666,8 +666,6 @@ ohci_hcd_at91_drv_suspend(struct device *dev) if (ohci_at91->wakeup) enable_irq_wake(hcd->irq); - ohci_at91_port_suspend(ohci_at91, 1); - ret = ohci_suspend(hcd, ohci_at91->wakeup); if (ret) { if (ohci_at91->wakeup) @@ -687,7 +685,10 @@ ohci_hcd_at91_drv_suspend(struct device *dev) /* flush the writes */ (void) ohci_readl (ohci, &ohci->regs->control); msleep(1); + ohci_at91_port_suspend(ohci_at91, 1); at91_stop_clock(ohci_at91); + } else { + ohci_at91_port_suspend(ohci_at91, 1); } return ret; @@ -699,6 +700,8 @@ ohci_hcd_at91_drv_resume(struct device *dev) struct usb_hcd *hcd = dev_get_drvdata(dev); struct ohci_at91_priv *ohci_at91 = hcd_to_ohci_at91_priv(hcd); + ohci_at91_port_suspend(ohci_at91, 0); + if (ohci_at91->wakeup) disable_irq_wake(hcd->irq); else @@ -706,8 +709,6 @@ ohci_hcd_at91_drv_resume(struct device *dev) ohci_resume(hcd, false); - ohci_at91_port_suspend(ohci_at91, 0); - return 0; } -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2021-06-09 12:10 UTC|newest] Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-06-09 12:10 Claudiu Beznea [this message] 2021-06-09 12:10 ` [PATCH] usb: host: ohci-at91: suspend/resume ports after/before OHCI accesses Claudiu Beznea 2021-06-09 12:40 ` Nicolas Ferre 2021-06-09 12:40 ` Nicolas Ferre 2021-06-09 23:07 ` Alan Stern 2021-06-09 23:07 ` Alan Stern 2021-06-23 12:47 ` Claudiu.Beznea 2021-06-23 12:47 ` Claudiu.Beznea 2021-06-23 13:59 ` Alan Stern 2021-06-23 13:59 ` Alan Stern 2021-06-23 14:09 ` Claudiu.Beznea 2021-06-23 14:09 ` Claudiu.Beznea 2021-06-23 14:19 ` Alan Stern 2021-06-23 14:19 ` Alan Stern 2021-06-23 14:33 ` Claudiu.Beznea 2021-06-23 14:33 ` Claudiu.Beznea 2021-06-23 16:41 ` Alan Stern 2021-06-23 16:41 ` Alan Stern 2021-06-24 6:40 ` Claudiu.Beznea 2021-06-24 6:40 ` Claudiu.Beznea 2021-06-24 6:54 ` Claudiu.Beznea 2021-06-24 6:54 ` Claudiu.Beznea 2021-06-24 13:23 ` Alan Stern 2021-06-24 13:23 ` Alan Stern 2021-06-30 14:46 ` Claudiu.Beznea 2021-06-30 14:46 ` Claudiu.Beznea 2021-06-30 18:21 ` Alan Stern 2021-06-30 18:21 ` Alan Stern 2021-07-01 5:45 ` Claudiu.Beznea 2021-07-01 5:45 ` Claudiu.Beznea 2021-07-01 14:01 ` Alan Stern 2021-07-01 14:01 ` Alan Stern 2021-06-30 14:47 ` Claudiu.Beznea 2021-06-30 14:47 ` Claudiu.Beznea 2021-07-21 8:08 ` Greg KH 2021-07-21 8:08 ` Greg KH
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