On 20/05/16 12:53, Peter Chen wrote: > On Fri, May 20, 2016 at 12:19:07PM +0300, Roger Quadros wrote: >> On 20/05/16 11:31, Roger Quadros wrote: >>> On 18/05/16 15:59, Roger Quadros wrote: >>>> Hi Peter, >>>> >>>> On 18/05/16 10:45, Peter Chen wrote: >>>>> >>>>> >>>>> On Mon, May 16, 2016 at 5:00 PM, Roger Quadros <rogerq@xxxxxx <mailto:rogerq@xxxxxx>> wrote: >>>>> >>>>> On 13/05/16 13:03, Roger Quadros wrote: >>>>> > It provides APIs for the following tasks >>>>> > >>>>> > - Registering an OTG/dual-role capable controller >>>>> > - Registering Host and Gadget controllers to OTG core >>>>> > - Providing inputs to and kicking the OTG state machine >>>>> > >>>>> > Provide a dual-role device (DRD) state machine. >>>>> > DRD mode is a reduced functionality OTG mode. In this mode >>>>> > we don't support SRP, HNP and dynamic role-swap. >>>>> > >>>>> > In DRD operation, the controller mode (Host or Peripheral) >>>>> > is decided based on the ID pin status. Once a cable plug (Type-A >>>>> > or Type-B) is attached the controller selects the state >>>>> > and doesn't change till the cable in unplugged and a different >>>>> > cable type is inserted. >>>>> > >>>>> > As we don't need most of the complex OTG states and OTG timers >>>>> > we implement a lean DRD state machine in usb-otg.c. >>>>> > The DRD state machine is only interested in 2 hardware inputs >>>>> > 'id' and 'b_sess_vld'. >>>>> > >>>>> > Signed-off-by: Roger Quadros <rogerq@xxxxxx <mailto:rogerq@xxxxxx>> >>>>> > --- >>>>> > drivers/usb/common/Makefile | 2 +- >>>>> > drivers/usb/common/usb-otg.c | 1042 ++++++++++++++++++++++++++++++++++++++++++ >>>>> > drivers/usb/core/Kconfig | 4 +- >>>>> > include/linux/usb/gadget.h | 2 + >>>>> > include/linux/usb/hcd.h | 1 + >>>>> > include/linux/usb/otg-fsm.h | 7 + >>>>> > include/linux/usb/otg.h | 154 ++++++- >>>>> > 7 files changed, 1206 insertions(+), 6 deletions(-) >>>>> > create mode 100644 drivers/usb/common/usb-otg.c >>>>> >>>>> >>>>> This patch causes the following build issues when CONFIG_USB_GADGET=m, CONFIG_USB=m, >>>>> CONFIG_USB_COMMON=m and CONFIG_USB_OTG=y >>>>> >>>>> ERROR: "usb_otg_register_gadget" [drivers/usb/gadget/udc/udc-core.ko] undefined! >>>>> ERROR: "usb_otg_unregister_gadget" [drivers/usb/gadget/udc/udc-core.ko] undefined! >>>>> ERROR: "usb_otg_register_hcd" [drivers/usb/core/usbcore.ko] undefined! >>>>> ERROR: "usb_otg_unregister_hcd" [drivers/usb/core/usbcore.ko] undefined! >>>>> ERROR: "otg_statemachine" [drivers/usb/chipidea/ci_hdrc.ko] undefined! >>>>> scripts/Makefile.modpost:91: recipe for target '__modpost' failed >>>>> make[1]: *** [__modpost] Error 1 >>>>> Makefile:1141: recipe for target 'modules' failed >>>>> make: *** [modules] Error 2 >>>>> make: *** Waiting for unfinished jobs.... >>>>> >>>>> drivers/built-in.o: In function `drd_set_state': >>>>> usb-otg.c:(.text+0x2b4242): undefined reference to `usb_otg_state_string' >>>>> drivers/built-in.o: In function `drd_statemachine': >>>>> (.text+0x2b4b4c): undefined reference to `usb_otg_state_string' >>>>> Makefile:937: recipe for target 'vmlinux' failed >>>>> >>>>> I'll fix it up with the following diff. >>>>> >>>>> diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile >>>>> index dca7856..16a5b55 100644 >>>>> --- a/drivers/usb/Makefile >>>>> +++ b/drivers/usb/Makefile >>>>> @@ -59,5 +59,6 @@ obj-$(CONFIG_USB_RENESAS_USBHS) += renesas_usbhs/ >>>>> obj-$(CONFIG_USB_GADGET) += gadget/ >>>>> >>>>> obj-$(CONFIG_USB_COMMON) += common/ >>>>> +obj-$(CONFIG_USB_OTG) += common/ >>>>> >>>>> obj-$(CONFIG_USBIP_CORE) += usbip/ >>>>> diff --git a/drivers/usb/common/usb-otg.c b/drivers/usb/common/usb-otg.c >>>>> index 77048aa..17e449e 100644 >>>>> --- a/drivers/usb/common/usb-otg.c >>>>> +++ b/drivers/usb/common/usb-otg.c >>>>> @@ -56,6 +56,30 @@ static int usb_otg_hcd_is_primary_hcd(struct usb_hcd *hcd) >>>>> return hcd == hcd->primary_hcd; >>>>> } >>>>> >>>>> +static const char *otg_state_string(enum usb_otg_state state) >>>>> +{ >>>>> + static const char *const names[] = { >>>>> + [OTG_STATE_A_IDLE] = "a_idle", >>>>> + [OTG_STATE_A_WAIT_VRISE] = "a_wait_vrise", >>>>> + [OTG_STATE_A_WAIT_BCON] = "a_wait_bcon", >>>>> + [OTG_STATE_A_HOST] = "a_host", >>>>> + [OTG_STATE_A_SUSPEND] = "a_suspend", >>>>> + [OTG_STATE_A_PERIPHERAL] = "a_peripheral", >>>>> + [OTG_STATE_A_WAIT_VFALL] = "a_wait_vfall", >>>>> + [OTG_STATE_A_VBUS_ERR] = "a_vbus_err", >>>>> + [OTG_STATE_B_IDLE] = "b_idle", >>>>> + [OTG_STATE_B_SRP_INIT] = "b_srp_init", >>>>> + [OTG_STATE_B_PERIPHERAL] = "b_peripheral", >>>>> + [OTG_STATE_B_WAIT_ACON] = "b_wait_acon", >>>>> + [OTG_STATE_B_HOST] = "b_host", >>>>> + }; >>>>> + >>>>> + if (state < 0 || state >= ARRAY_SIZE(names)) >>>>> + return "UNDEFINED"; >>>>> + >>>>> + return names[state]; >>>>> +} >>>>> + >>>>> >>>>> >>>>> >>>>> From my point, make another copy for otg stuff is not a good way, >>>>> could we make folder under usb/ named otg for dedicated otg stuffs, >>>>> in that case, build otg stuffs can not depend on USB_COMMON. >>>> >>>> OK. I can try that. I'll delete otg_state_string from usb-common.c and >>>> move it into usb/otg/usb-otg.c >>>> >>>> I'll also move usb-otg-fsm.c to usb/otg/. >>> >>> But we can't delete usb_otg_state_string() from usb-common.c. That is used at a >>> number of places whether OTG is enabled or not. >>> >>> One option is to make usb-common built in when otg is enabled. What do you say? >>> >> >> This should also get solved if we make USB_OTG tristate so that it is same as >> USB_COMMON. >> >> However I haven't had success in making Kconfig behave like this. >> >> USB_OTG = y if USB == y && GADGET = m >> USB_OTG = y if USB == m && GADGET = y >> >> Is there any Kconfig trickery to get this behaviour? >> > > Unless let the USB_OTG works like USB_COMMON which is selected by GADGET > or HCD. In fact, HCD and Gadget code uses USB OTG symbol directly in > this framework, it seems like HCD and Gadget depends on OTG, but not > otherwise. Not necessarily for build. We have dummy otg functions if USB_OTG is not defined, and we have checks in place if OTG drivers use OTG related functions while USB_OTG is not enabled. > > If we want OTG to depend on HCD && GADGET, we need not to use OTG symbol > at HCD and GADGET, and the OTG can use HCD and GADGET symbol directly. > We can't use select as we don't want USB_OTG enabled when only one of HCD or GADGET is enabled. We also want users to be able to disable USB_OTG when both HCD and GADGET are enabled. cheers, -roger -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
