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SubjectRe: musb: am3358: having performance problem with usb1

On 08/13/2016 01:44 AM, Greg KH wrote:
> On Sat, Aug 13, 2016 at 12:38:46AM +0800, ayaka wrote:
>> On 08/12/2016 03:40 PM, Greg KH wrote:
>>> On Fri, Aug 12, 2016 at 10:23:15AM +0800, ayaka wrote:
>>>> Hello all:
>>>> I recently add a support for customize am3358 board using the branch
>>>> processor-sdk-linux-03.00.00 from Ti git. But I meet a problem with musb
>>>> at the peripheral mode.
>>> Then you are going to have to get support from TI for this, nothing we
>>> can do here about random vendor kernel trees, sorry.
>>> If you can use the 4.7 tree, or better yet, the 4.8-rc tree, then we
>> I have tried the 4.8-rc1, I meet the same problem.
> What problem is that exactly?
OK, I would said it is a performance problem.
First it can't work with DMA
brd: module loaded
loop: module loaded
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
ehci-platform: EHCI generic platform driver
ehci-omap: OMAP-EHCI Host Controller driver
ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
musb-hdrc Failed to request rx1.
musb-hdrc musb_init_controller failed with status -517
i2c /dev entries driver
omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
sdhci: Secure Digital Host Controller Interface driver

Second, the USB1 is always work on usb 2.0 full speed when I used it as
a gadget device.
But it should support high speed mode.

>> I have enabled the CONFIG_OMAP_USB2, I don't find at ti's kernel.
> I don't understand, is that your hardware you are using?
> thanks,
> greg k-h

Here is the usb part of dts I wrote, should I give you a full dts?
&usb {
status = "okay";

&usb_ctrl_mod {
status = "okay";

&usb1_phy {
vcc-supply = <&v33_reg>;
status = "okay";

&usb1 {
status = "okay";
dr_mode = "peripheral";

&cppi41dma {
status = "okay";

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