On Tue, Sep 15, 2015 at 10:49 PM, Peter Chen <peter.chen@xxxxxxxxxxxxx> wrote: > For imx27, it needs three clocks to let the controller work, > the old code is wrong, and will cause below data abort when > accass usbmisc registers. > > usbcore: registered new interface driver usb-storage > Unhandled fault: external abort on non-linefetch (0x008) at 0xf4424600 > pgd = c0004000 > [f4424600] *pgd=10000452(bad) > Internal error: : 8 [#1] PREEMPT ARM > Modules linked in: > CPU: 0 PID: 1 Comm: swapper Not tainted 4.1.0-next-20150701-dirty #3089 > Hardware name: Freescale i.MX27 (Device Tree Support) > task: c7832b60 ti: c783e000 task.ti: c783e000 > PC is at usbmisc_imx27_init+0x4c/0xbc > LR is at usbmisc_imx27_init+0x40/0xbc > pc : [<c03cb5c0>] lr : [<c03cb5b4>] psr: 60000093 > sp : c783fe08 ip : 00000000 fp : 00000000 > r10: c0576434 r9 : 0000009c r8 : c7a773a0 > r7 : 01000000 r6 : 60000013 r5 : c7a776f0 r4 : c7a773f0 > r3 : f4424600 r2 : 00000000 r1 : 00000001 r0 : 00000001 > Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel > Control: 0005317f Table: a0004000 DAC: 00000017 > Process swapper (pid: 1, stack limit = 0xc783e190) > Stack: (0xc783fe08 to 0xc7840000) > > Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx> > Reported-by: Fabio Estevam <fabio.estevam@xxxxxxxxxxxxx> > Cc: <stable@xxxxxxxxxxxxxxx> > --- > arch/arm/boot/dts/imx27.dtsi | 19 +++++++++++++++---- > 1 file changed, 15 insertions(+), 4 deletions(-) > > diff --git a/arch/arm/boot/dts/imx27.dtsi b/arch/arm/boot/dts/imx27.dtsi > index feb9d34..93e3e14 100644 > --- a/arch/arm/boot/dts/imx27.dtsi > +++ b/arch/arm/boot/dts/imx27.dtsi mx25.dtsi and mx35.dtsi also need to be changed. > @@ -486,7 +486,11 @@ > compatible = "fsl,imx27-usb"; > reg = <0x10024000 0x200>; > interrupts = <56>; > - clocks = <&clks IMX27_CLK_USB_IPG_GATE>; > + need-three-clocks; > + clocks = <&clks IMX27_CLK_USB_IPG_GATE>, > + <&clks IMX27_CLK_USB_AHB_GATE>, > + <&clks IMX27_CLK_USB_DIV>; > + clock-names = "ipg", "ahb", "per"; 'ipg' and 'ahb' are enough. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
