Hi Fabio,
On 16/08/14 18:01, Fabio Estevam wrote:
Hi Philippe,
On Sat, Aug 16, 2014 at 12:38 PM, Philippe Reynes<tremyfr@xxxxxxxxx> wrote:
Hi all,
i.MX27's usb needs three clocks (usb_ipg_gate, usb_ahb_gate and usb_div)
but the current chipidea driver implementation, and devicetree, provides
only ipg and ahb. Consequently, if the bootloader don't enable the last
one, the kernel will crash.
Which kernel version and what is the crash log you are getting?
I use linux git kernel (from linus) and 3.16.
Both has the same result, a crash in the function hw_phymode_configure.
I used to get a USB crash on mx27, which was fixed with the following commit:
commit b67b19447eb4f60d4f004f48298154630d4bed39
Author: Fabio Estevam<fabio.estevam@xxxxxxxxxxxxx>
Date: Wed Apr 16 14:53:18 2014 -0300
ARM: dts: imx27: Use the correct usb clock gate
USB Host1, Host2 and OTG are gated via 'usb_ipg_gate' clock, so
fix it in order
to avoid the following kernel oops:
usbcore: registered new interface driver usb-storage
10024000.usb supply vbus not found, using dummy regulator
Unhandled fault: external abort on non-linefetch (0x808) at 0xf4424184
Internal error: : 808 [#1] PREEMPT ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 3.15.0-rc1-26325-g971f9fd-dirty #64
task: c7829aa0 ti: c7836000 task.ti: c7836000
PC is at ci_hdrc_probe+0x3a4/0x634
LR is at ci_hdrc_probe+0x100/0x634
pc : [<c036cc78>] lr : [<c036c9d4>] psr: 60000013
sp : c7837d48 ip : 00000001 fp : 00000000
r10: 00000000 r9 : 00000000 r8 : c791b6c0
r7 : c7945000 r6 : f4424000 r5 : c7945010 r4 : c794e010
r3 : f4424184 r2 : 00000000 r1 : 8c000004 r0 : 0c000004
Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
Control: 0005317f Table: a0004000 DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc78361c0)
Stack: (0xc7837d48 to 0xc7838000)
Signed-off-by: Fabio Estevam<fabio.estevam@xxxxxxxxxxxxx>
Signed-off-by: Shawn Guo<shawn.guo@xxxxxxxxxxxxx>
Do you have this one applied?
Yes, I've got this commit on my kernel.
This patch enable clock ipg, but the clock usb_div is disable,
so the "crash" still happen. The only way we found to get the
usb working is to enable the three usb clock : ipg, ahb and per.
Best regards,
Philippe
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