Hi Igor, [Adding linux-arm-kernel] On Tue, Dec 14, 2010 at 11:16 AM, Igor Grinberg <grinberg@xxxxxxxxxxxxxx> wrote: > Hi Fabio, > > On 12/14/10 00:14, Fabio Estevam wrote: >> Hi, >> >> I am working on adding USB OTG host support for the mx31_3ds board >> (OTG PHY is a ISP1504). > > ISP1504 seems like ULPI compliant transceiver. > >> USB OTG in device mode works fine and I can only get OTG host mode to >> work if I force a 'return 0' into the ulpi_check_integrity function. I >> was wondering if anyone has any suggestions as to where to >> inspect/debug the fact that the read/write to the OTG PHY scratch >> register does not match. > > Both ULPI specifications (1.0 and 1.1) define the Scratch register as: > "an empty register byte for testing purposes. Software can read, write, > set and clear this register; and the functionality of the PHY will not be affected." > Therefore it should be implemented in the ISP1504 as such and according to > NXP's ISP1504 datasheet it should be there... > > What about the ID? Do you get the vendor/product ID value as expected? No, I am getting only zeros when reading vendor/product ID: ULPI transceiver vendor/product ID 0x0000/0x0000 Even though the ULPI integrity check fails, if I force a 'return 0' in this function, then I am able to mount a USB stick and it is functional. There are other i.MX boards that support OTG in host mode via ULPI, such as pcm037, pca100, imx27_visstrim . I am curious to know if any of this boards can work in host mode OTG with current mainline kernel. Thanks, Fabio Estevam -- 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
