diff options
| author | Peter Chen <peter.chen@freescale.com> | 2013-07-22 12:05:24 +0800 |
|---|---|---|
| committer | Nitin Garg <nitin.garg@freescale.com> | 2014-06-03 23:01:38 -0500 |
| commit | 5e45d3f04f81adc5c3116507ad8375bc222eb449 (patch) | |
| tree | c5d2d4ebca139f26882d90aef4a45efc6cde69a0 /arch/arm | |
| parent | 1aef0803e99722e1586704fea04e470591c71d88 (diff) | |
ENGR00272022 msl-mx6: usb: wait PHY clock stable explicitly
At mx6, if usb wakeup is not enabled, the PHY's power
will be off during the system suspend, so the dp/dm
will be unknown after the system resumes, it may wake up
controller at some boards since dp/dm's status satisfies
wake up condition. If the controller is waken up, the
PHCD will be cleared automatically.
According to IC requirement, after PHCD is cleared, we
need to wait 1ms before clear PHY's clock gate to wait
PHY's clock stable. At above condition, the PHCD is cleared
automatically, it may less than 1ms before we clear
PHY's clock gate, then, software operation to clear PHY's
clock gate will be useless. At this case, the PHY will works
abnormal, and cause the controller hang when we write some registers
(eg, portsc).
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-mx6/usb_dr.c | 8 | ||||
| -rw-r--r-- | arch/arm/mach-mx6/usb_h1.c | 8 |
2 files changed, 10 insertions, 6 deletions
diff --git a/arch/arm/mach-mx6/usb_dr.c b/arch/arm/mach-mx6/usb_dr.c index e6496bc9cd50..c02158b4a2fc 100644 --- a/arch/arm/mach-mx6/usb_dr.c +++ b/arch/arm/mach-mx6/usb_dr.c @@ -248,10 +248,12 @@ static void enter_phy_lowpower_suspend(struct fsl_usb2_platform_data *pdata, boo usbotg_internal_phy_clock_gate(false); } else { - if (UOG_PORTSC1 & PORTSC_PHCD) { + if (UOG_PORTSC1 & PORTSC_PHCD) UOG_PORTSC1 &= ~PORTSC_PHCD; - mdelay(1); - } + + /* Wait PHY clock stable */ + mdelay(1); + usbotg_internal_phy_clock_gate(true); tmp = (BM_USBPHY_PWD_TXPWDFS | BM_USBPHY_PWD_TXPWDIBIAS diff --git a/arch/arm/mach-mx6/usb_h1.c b/arch/arm/mach-mx6/usb_h1.c index 6de99d96142b..a95bcdead9d6 100644 --- a/arch/arm/mach-mx6/usb_h1.c +++ b/arch/arm/mach-mx6/usb_h1.c @@ -332,10 +332,12 @@ static void _phy_lowpower_suspend(struct fsl_usb2_platform_data *pdata, bool ena usbh1_internal_phy_clock_gate(false); } else { - if (UH1_PORTSC1 & PORTSC_PHCD) { + if (UH1_PORTSC1 & PORTSC_PHCD) UH1_PORTSC1 &= ~PORTSC_PHCD; - mdelay(1); - } + + /* Wait PHY clock stable */ + mdelay(1); + usbh1_internal_phy_clock_gate(true); tmp = (BM_USBPHY_PWD_TXPWDFS | BM_USBPHY_PWD_TXPWDIBIAS |