* [PATCH v2] powerpc/usb: fix bug of CPU hang when missing USB PHY clock
@ 2012-08-22 10:17 Shengzhou Liu
2012-09-18 5:35 ` Kumar Gala
0 siblings, 1 reply; 4+ messages in thread
From: Shengzhou Liu @ 2012-08-22 10:17 UTC (permalink / raw)
To: linuxppc-dev, linux-usb, galak; +Cc: Shengzhou Liu
when missing USB PHY clock, kernel booting up will hang during USB
initialization. We should check USBGP[PHY_CLK_VALID] bit to avoid
CPU hanging in this case.
Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
---
v2 changes: use spin_event_timeout() instead.
drivers/usb/host/ehci-fsl.c | 58 +++++++++++++++++++++++++++++-------------
drivers/usb/host/ehci-fsl.h | 1 +
include/linux/fsl_devices.h | 1 +
3 files changed, 42 insertions(+), 18 deletions(-)
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index b7451b2..11ff4b4 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -210,11 +210,11 @@ static void usb_hcd_fsl_remove(struct usb_hcd *hcd,
usb_put_hcd(hcd);
}
-static void ehci_fsl_setup_phy(struct usb_hcd *hcd,
+static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
enum fsl_usb2_phy_modes phy_mode,
unsigned int port_offset)
{
- u32 portsc, temp;
+ u32 portsc;
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
void __iomem *non_ehci = hcd->regs;
struct device *dev = hcd->self.controller;
@@ -232,9 +232,15 @@ static void ehci_fsl_setup_phy(struct usb_hcd *hcd,
case FSL_USB2_PHY_ULPI:
if (pdata->controller_ver) {
/* controller version 1.6 or above */
- temp = in_be32(non_ehci + FSL_SOC_USB_CTRL);
- out_be32(non_ehci + FSL_SOC_USB_CTRL, temp |
- USB_CTRL_USB_EN | ULPI_PHY_CLK_SEL);
+ setbits32(non_ehci + FSL_SOC_USB_CTRL,
+ ULPI_PHY_CLK_SEL);
+ /*
+ * Due to controller issue of PHY_CLK_VALID in ULPI
+ * mode, we set USB_CTRL_USB_EN before checking
+ * PHY_CLK_VALID, otherwise PHY_CLK_VALID doesn't work.
+ */
+ clrsetbits_be32(non_ehci + FSL_SOC_USB_CTRL,
+ UTMI_PHY_EN, USB_CTRL_USB_EN);
}
portsc |= PORT_PTS_ULPI;
break;
@@ -247,9 +253,7 @@ static void ehci_fsl_setup_phy(struct usb_hcd *hcd,
case FSL_USB2_PHY_UTMI:
if (pdata->controller_ver) {
/* controller version 1.6 or above */
- temp = in_be32(non_ehci + FSL_SOC_USB_CTRL);
- out_be32(non_ehci + FSL_SOC_USB_CTRL, temp |
- UTMI_PHY_EN | USB_CTRL_USB_EN);
+ setbits32(non_ehci + FSL_SOC_USB_CTRL, UTMI_PHY_EN);
mdelay(FSL_UTMI_PHY_DLY); /* Delay for UTMI PHY CLK to
become stable - 10ms*/
}
@@ -262,23 +266,34 @@ static void ehci_fsl_setup_phy(struct usb_hcd *hcd,
case FSL_USB2_PHY_NONE:
break;
}
+
+ if ((pdata->controller_ver) && ((phy_mode == FSL_USB2_PHY_ULPI) ||
+ (phy_mode == FSL_USB2_PHY_UTMI))) {
+ /* check PHY_CLK_VALID to get phy clk valid */
+ if (!spin_event_timeout(in_be32(non_ehci + FSL_SOC_USB_CTRL) &
+ PHY_CLK_VALID, FSL_USB_PHY_CLK_TIMEOUT, 0)) {
+ printk(KERN_WARNING "fsl-ehci: USB PHY clock invalid\n");
+ return -EINVAL;
+ }
+ }
+
ehci_writel(ehci, portsc, &ehci->regs->port_status[port_offset]);
+
+ if (phy_mode != FSL_USB2_PHY_ULPI)
+ setbits32(non_ehci + FSL_SOC_USB_CTRL, USB_CTRL_USB_EN);
+
+ return 0;
}
-static void ehci_fsl_usb_setup(struct ehci_hcd *ehci)
+static int ehci_fsl_usb_setup(struct ehci_hcd *ehci)
{
struct usb_hcd *hcd = ehci_to_hcd(ehci);
struct fsl_usb2_platform_data *pdata;
void __iomem *non_ehci = hcd->regs;
- u32 temp;
pdata = hcd->self.controller->platform_data;
- /* Enable PHY interface in the control reg. */
if (pdata->have_sysif_regs) {
- temp = in_be32(non_ehci + FSL_SOC_USB_CTRL);
- out_be32(non_ehci + FSL_SOC_USB_CTRL, temp | 0x00000004);
-
/*
* Turn on cache snooping hardware, since some PowerPC platforms
* wholly rely on hardware to deal with cache coherent
@@ -293,7 +308,8 @@ static void ehci_fsl_usb_setup(struct ehci_hcd *ehci)
if ((pdata->operating_mode == FSL_USB2_DR_HOST) ||
(pdata->operating_mode == FSL_USB2_DR_OTG))
- ehci_fsl_setup_phy(hcd, pdata->phy_mode, 0);
+ if (ehci_fsl_setup_phy(hcd, pdata->phy_mode, 0))
+ return -EINVAL;
if (pdata->operating_mode == FSL_USB2_MPH_HOST) {
unsigned int chip, rev, svr;
@@ -307,9 +323,12 @@ static void ehci_fsl_usb_setup(struct ehci_hcd *ehci)
ehci->has_fsl_port_bug = 1;
if (pdata->port_enables & FSL_USB2_PORT0_ENABLED)
- ehci_fsl_setup_phy(hcd, pdata->phy_mode, 0);
+ if (ehci_fsl_setup_phy(hcd, pdata->phy_mode, 0))
+ return -EINVAL;
+
if (pdata->port_enables & FSL_USB2_PORT1_ENABLED)
- ehci_fsl_setup_phy(hcd, pdata->phy_mode, 1);
+ if (ehci_fsl_setup_phy(hcd, pdata->phy_mode, 1))
+ return -EINVAL;
}
if (pdata->have_sysif_regs) {
@@ -322,12 +341,15 @@ static void ehci_fsl_usb_setup(struct ehci_hcd *ehci)
#endif
out_be32(non_ehci + FSL_SOC_USB_SICTRL, 0x00000001);
}
+
+ return 0;
}
/* called after powerup, by probe or system-pm "wakeup" */
static int ehci_fsl_reinit(struct ehci_hcd *ehci)
{
- ehci_fsl_usb_setup(ehci);
+ if (ehci_fsl_usb_setup(ehci))
+ return -EINVAL;
ehci_port_power(ehci, 0);
return 0;
diff --git a/drivers/usb/host/ehci-fsl.h b/drivers/usb/host/ehci-fsl.h
index 8840368..dbd292e 100644
--- a/drivers/usb/host/ehci-fsl.h
+++ b/drivers/usb/host/ehci-fsl.h
@@ -61,4 +61,5 @@
#define PLL_RESET (1<<8)
#define UTMI_PHY_EN (1<<9)
#define ULPI_PHY_CLK_SEL (1<<10)
+#define PHY_CLK_VALID (1<<17)
#endif /* _EHCI_FSL_H */
diff --git a/include/linux/fsl_devices.h b/include/linux/fsl_devices.h
index 15be561..ccfc4bb 100644
--- a/include/linux/fsl_devices.h
+++ b/include/linux/fsl_devices.h
@@ -19,6 +19,7 @@
#define FSL_UTMI_PHY_DLY 10 /*As per P1010RM, delay for UTMI
PHY CLK to become stable - 10ms*/
+#define FSL_USB_PHY_CLK_TIMEOUT 1000 /* uSec */
#define FSL_USB_VER_OLD 0
#define FSL_USB_VER_1_6 1
#define FSL_USB_VER_2_2 2
--
1.6.4
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [PATCH v2] powerpc/usb: fix bug of CPU hang when missing USB PHY clock
2012-08-22 10:17 [PATCH v2] powerpc/usb: fix bug of CPU hang when missing USB PHY clock Shengzhou Liu
@ 2012-09-18 5:35 ` Kumar Gala
2012-09-18 9:31 ` Liu Shengzhou-B36685
2012-09-18 14:34 ` Greg KH
0 siblings, 2 replies; 4+ messages in thread
From: Kumar Gala @ 2012-09-18 5:35 UTC (permalink / raw)
To: Greg KH; +Cc: linux-usb, linuxppc-dev@lists.ozlabs.org list, Shengzhou Liu
On Aug 22, 2012, at 5:17 AM, Shengzhou Liu wrote:
> when missing USB PHY clock, kernel booting up will hang during USB
> initialization. We should check USBGP[PHY_CLK_VALID] bit to avoid
> CPU hanging in this case.
>=20
> Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
> ---
> v2 changes: use spin_event_timeout() instead.
>=20
> drivers/usb/host/ehci-fsl.c | 58 =
+++++++++++++++++++++++++++++-------------
> drivers/usb/host/ehci-fsl.h | 1 +
> include/linux/fsl_devices.h | 1 +
> 3 files changed, 42 insertions(+), 18 deletions(-)
Greg,
Any issues picking this fix up for v3.6 inclusion?
- k
>=20
> diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
> index b7451b2..11ff4b4 100644
> --- a/drivers/usb/host/ehci-fsl.c
> +++ b/drivers/usb/host/ehci-fsl.c
> @@ -210,11 +210,11 @@ static void usb_hcd_fsl_remove(struct usb_hcd =
*hcd,
> usb_put_hcd(hcd);
> }
>=20
> -static void ehci_fsl_setup_phy(struct usb_hcd *hcd,
> +static int ehci_fsl_setup_phy(struct usb_hcd *hcd,
> enum fsl_usb2_phy_modes phy_mode,
> unsigned int port_offset)
> {
> - u32 portsc, temp;
> + u32 portsc;
> struct ehci_hcd *ehci =3D hcd_to_ehci(hcd);
> void __iomem *non_ehci =3D hcd->regs;
> struct device *dev =3D hcd->self.controller;
> @@ -232,9 +232,15 @@ static void ehci_fsl_setup_phy(struct usb_hcd =
*hcd,
> case FSL_USB2_PHY_ULPI:
> if (pdata->controller_ver) {
> /* controller version 1.6 or above */
> - temp =3D in_be32(non_ehci + FSL_SOC_USB_CTRL);
> - out_be32(non_ehci + FSL_SOC_USB_CTRL, temp |
> - USB_CTRL_USB_EN | ULPI_PHY_CLK_SEL);
> + setbits32(non_ehci + FSL_SOC_USB_CTRL,
> + ULPI_PHY_CLK_SEL);
> + /*
> + * Due to controller issue of PHY_CLK_VALID in =
ULPI
> + * mode, we set USB_CTRL_USB_EN before checking
> + * PHY_CLK_VALID, otherwise PHY_CLK_VALID =
doesn't work.
> + */
> + clrsetbits_be32(non_ehci + FSL_SOC_USB_CTRL,
> + UTMI_PHY_EN, USB_CTRL_USB_EN);
> }
> portsc |=3D PORT_PTS_ULPI;
> break;
> @@ -247,9 +253,7 @@ static void ehci_fsl_setup_phy(struct usb_hcd =
*hcd,
> case FSL_USB2_PHY_UTMI:
> if (pdata->controller_ver) {
> /* controller version 1.6 or above */
> - temp =3D in_be32(non_ehci + FSL_SOC_USB_CTRL);
> - out_be32(non_ehci + FSL_SOC_USB_CTRL, temp |
> - UTMI_PHY_EN | USB_CTRL_USB_EN);
> + setbits32(non_ehci + FSL_SOC_USB_CTRL, =
UTMI_PHY_EN);
> mdelay(FSL_UTMI_PHY_DLY); /* Delay for UTMI PHY =
CLK to
> become stable - 10ms*/
> }
> @@ -262,23 +266,34 @@ static void ehci_fsl_setup_phy(struct usb_hcd =
*hcd,
> case FSL_USB2_PHY_NONE:
> break;
> }
> +
> + if ((pdata->controller_ver) && ((phy_mode =3D=3D =
FSL_USB2_PHY_ULPI) ||
> + (phy_mode =3D=3D FSL_USB2_PHY_UTMI))) {
> + /* check PHY_CLK_VALID to get phy clk valid */
> + if (!spin_event_timeout(in_be32(non_ehci + =
FSL_SOC_USB_CTRL) &
> + PHY_CLK_VALID, FSL_USB_PHY_CLK_TIMEOUT, =
0)) {
> + printk(KERN_WARNING "fsl-ehci: USB PHY clock =
invalid\n");
> + return -EINVAL;
> + }
> + }
> +
> ehci_writel(ehci, portsc, =
&ehci->regs->port_status[port_offset]);
> +
> + if (phy_mode !=3D FSL_USB2_PHY_ULPI)
> + setbits32(non_ehci + FSL_SOC_USB_CTRL, USB_CTRL_USB_EN);
> +
> + return 0;
> }
>=20
> -static void ehci_fsl_usb_setup(struct ehci_hcd *ehci)
> +static int ehci_fsl_usb_setup(struct ehci_hcd *ehci)
> {
> struct usb_hcd *hcd =3D ehci_to_hcd(ehci);
> struct fsl_usb2_platform_data *pdata;
> void __iomem *non_ehci =3D hcd->regs;
> - u32 temp;
>=20
> pdata =3D hcd->self.controller->platform_data;
>=20
> - /* Enable PHY interface in the control reg. */
> if (pdata->have_sysif_regs) {
> - temp =3D in_be32(non_ehci + FSL_SOC_USB_CTRL);
> - out_be32(non_ehci + FSL_SOC_USB_CTRL, temp | =
0x00000004);
> -
> /*
> * Turn on cache snooping hardware, since some PowerPC =
platforms
> * wholly rely on hardware to deal with cache coherent
> @@ -293,7 +308,8 @@ static void ehci_fsl_usb_setup(struct ehci_hcd =
*ehci)
>=20
> if ((pdata->operating_mode =3D=3D FSL_USB2_DR_HOST) ||
> (pdata->operating_mode =3D=3D FSL_USB2_DR_OTG))
> - ehci_fsl_setup_phy(hcd, pdata->phy_mode, 0);
> + if (ehci_fsl_setup_phy(hcd, pdata->phy_mode, 0))
> + return -EINVAL;
>=20
> if (pdata->operating_mode =3D=3D FSL_USB2_MPH_HOST) {
> unsigned int chip, rev, svr;
> @@ -307,9 +323,12 @@ static void ehci_fsl_usb_setup(struct ehci_hcd =
*ehci)
> ehci->has_fsl_port_bug =3D 1;
>=20
> if (pdata->port_enables & FSL_USB2_PORT0_ENABLED)
> - ehci_fsl_setup_phy(hcd, pdata->phy_mode, 0);
> + if (ehci_fsl_setup_phy(hcd, pdata->phy_mode, 0))
> + return -EINVAL;
> +
> if (pdata->port_enables & FSL_USB2_PORT1_ENABLED)
> - ehci_fsl_setup_phy(hcd, pdata->phy_mode, 1);
> + if (ehci_fsl_setup_phy(hcd, pdata->phy_mode, 1))
> + return -EINVAL;
> }
>=20
> if (pdata->have_sysif_regs) {
> @@ -322,12 +341,15 @@ static void ehci_fsl_usb_setup(struct ehci_hcd =
*ehci)
> #endif
> out_be32(non_ehci + FSL_SOC_USB_SICTRL, 0x00000001);
> }
> +
> + return 0;
> }
>=20
> /* called after powerup, by probe or system-pm "wakeup" */
> static int ehci_fsl_reinit(struct ehci_hcd *ehci)
> {
> - ehci_fsl_usb_setup(ehci);
> + if (ehci_fsl_usb_setup(ehci))
> + return -EINVAL;
> ehci_port_power(ehci, 0);
>=20
> return 0;
> diff --git a/drivers/usb/host/ehci-fsl.h b/drivers/usb/host/ehci-fsl.h
> index 8840368..dbd292e 100644
> --- a/drivers/usb/host/ehci-fsl.h
> +++ b/drivers/usb/host/ehci-fsl.h
> @@ -61,4 +61,5 @@
> #define PLL_RESET (1<<8)
> #define UTMI_PHY_EN (1<<9)
> #define ULPI_PHY_CLK_SEL (1<<10)
> +#define PHY_CLK_VALID (1<<17)
> #endif /* _EHCI_FSL_H */
> diff --git a/include/linux/fsl_devices.h b/include/linux/fsl_devices.h
> index 15be561..ccfc4bb 100644
> --- a/include/linux/fsl_devices.h
> +++ b/include/linux/fsl_devices.h
> @@ -19,6 +19,7 @@
>=20
> #define FSL_UTMI_PHY_DLY 10 /*As per P1010RM, delay for UTMI
> PHY CLK to become stable - 10ms*/
> +#define FSL_USB_PHY_CLK_TIMEOUT 1000 /* uSec */
> #define FSL_USB_VER_OLD 0
> #define FSL_USB_VER_1_6 1
> #define FSL_USB_VER_2_2 2
> --=20
> 1.6.4
>=20
^ permalink raw reply [flat|nested] 4+ messages in thread* RE: [PATCH v2] powerpc/usb: fix bug of CPU hang when missing USB PHY clock
2012-09-18 5:35 ` Kumar Gala
@ 2012-09-18 9:31 ` Liu Shengzhou-B36685
2012-09-18 14:34 ` Greg KH
1 sibling, 0 replies; 4+ messages in thread
From: Liu Shengzhou-B36685 @ 2012-09-18 9:31 UTC (permalink / raw)
To: Kumar Gala, Greg KH
Cc: linux-usb@vger.kernel.org, linuxppc-dev@lists.ozlabs.org list
> -----Original Message-----
> From: Kumar Gala [mailto:galak@kernel.crashing.org]
> Sent: Tuesday, September 18, 2012 1:35 PM
> To: Greg KH
> Cc: Liu Shengzhou-B36685; linuxppc-dev@lists.ozlabs.org list; linux-
> usb@vger.kernel.org
> Subject: Re: [PATCH v2] powerpc/usb: fix bug of CPU hang when missing USB
> PHY clock
>=20
>=20
> On Aug 22, 2012, at 5:17 AM, Shengzhou Liu wrote:
>=20
> > when missing USB PHY clock, kernel booting up will hang during USB
> > initialization. We should check USBGP[PHY_CLK_VALID] bit to avoid CPU
> > hanging in this case.
> >
> > Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
> > ---
> > v2 changes: use spin_event_timeout() instead.
> >
> > drivers/usb/host/ehci-fsl.c | 58 +++++++++++++++++++++++++++++-------
> ------
> > drivers/usb/host/ehci-fsl.h | 1 +
> > include/linux/fsl_devices.h | 1 +
> > 3 files changed, 42 insertions(+), 18 deletions(-)
>=20
> Greg,
>=20
> Any issues picking this fix up for v3.6 inclusion?
>=20
> - k
>=20
[Shengzhou] please pick the v3, thanks.
http://patchwork.ozlabs.org/patch/184666/
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH v2] powerpc/usb: fix bug of CPU hang when missing USB PHY clock
2012-09-18 5:35 ` Kumar Gala
2012-09-18 9:31 ` Liu Shengzhou-B36685
@ 2012-09-18 14:34 ` Greg KH
1 sibling, 0 replies; 4+ messages in thread
From: Greg KH @ 2012-09-18 14:34 UTC (permalink / raw)
To: Kumar Gala; +Cc: linux-usb, linuxppc-dev@lists.ozlabs.org list, Shengzhou Liu
On Tue, Sep 18, 2012 at 12:35:09AM -0500, Kumar Gala wrote:
>
> On Aug 22, 2012, at 5:17 AM, Shengzhou Liu wrote:
>
> > when missing USB PHY clock, kernel booting up will hang during USB
> > initialization. We should check USBGP[PHY_CLK_VALID] bit to avoid
> > CPU hanging in this case.
> >
> > Signed-off-by: Shengzhou Liu <Shengzhou.Liu@freescale.com>
> > ---
> > v2 changes: use spin_event_timeout() instead.
> >
> > drivers/usb/host/ehci-fsl.c | 58 +++++++++++++++++++++++++++++-------------
> > drivers/usb/host/ehci-fsl.h | 1 +
> > include/linux/fsl_devices.h | 1 +
> > 3 files changed, 42 insertions(+), 18 deletions(-)
>
> Greg,
>
> Any issues picking this fix up for v3.6 inclusion?
Yes, I will not as there is a v3 out there that I want some review on
before I can take it...
thanks,
greg k-h
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2012-09-18 14:41 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2012-08-22 10:17 [PATCH v2] powerpc/usb: fix bug of CPU hang when missing USB PHY clock Shengzhou Liu
2012-09-18 5:35 ` Kumar Gala
2012-09-18 9:31 ` Liu Shengzhou-B36685
2012-09-18 14:34 ` Greg KH
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