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authorPeter Chen <peter.chen@freescale.com>2013-06-13 18:59:52 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-06-18 00:45:46 +0400
commit20a677fd63c57edd5b0c463baa44f133b2f2d4a0 (patch)
tree7ef8fc254c14cf2cac8b2771133c42cd4dbc74e7 /drivers/usb/chipidea
parent05f6353b830768d2f3ac34005975e78b4dc7ec45 (diff)
downloadlinux-20a677fd63c57edd5b0c463baa44f133b2f2d4a0.tar.xz
usb: chipidea: improve kconfig
Randy Dunlap <rdunlap@infradead.org> reported this problem on i386: > drivers/built-in.o: In function `ci_hdrc_host_init': > (.text+0x2ce75c): undefined reference to `ehci_init_driver' > > When USB_EHCI_HCD=m and USB_CHIPIDEA=y. In fact, this problem is existed on all platforms which are using chipidea driver. The root cause of this problem is the chipidea host uses symbol exported from ehci-hcd, but chipidea core does not depends on USB_EHCI_HCD. So, chipidea driver will not be compiled as module if USB_EHCI_HCD=m. It is very hard to give a perfect solution since chipidea core depends on USB || USB_GADGET, and chipdiea host depends on both USB_EHCI_HCD and USB_CHIPIDEA, the same problem exists for gadget. To fix this problem, we had to have below assumptions: - If USB_EHCI_HCD=y && USB_GADGET=y, USB_CHIPIDEA can be 'y'. - If USB_EHCI_HCD=m && USB_GADGET=y, USB_CHIPIDEA=m or USB_CHIPIDEA_HOST can't be seen if USB_CHIPIDEA=y. It will cause compile error due to no glue layer for ehci: > error: #error "missing bus glue for ehci-hcd" So, we had to compile USB_CHIPIDEA=m if USB_EHCI_HCD=m, current ehci hcd core guarantee it. - If USB_EHCI_HCD=y && USB_GADGET=m, USB_CHIPIDEA=m or USB_CHIPIDEA_UDC can't be seen if USB_CHIPIDEA=y. Of cos, the gadget will out of working at this situation, so the user had to compile USB_CHIPIDEA=m. - USB_EHCI_HCD=m && USB_GADGET=m, we can't see USB_CHIPIDEA_HOST and USB_CHIPIDEA_UDC unless USB_CHIPIDEA=m. The reason why it has above assumptions: - If both ehci core and gadget core build as module, the chipidea has to build as module. - If one of ehci core or gadget core is built in, another is built as module, we can only enable the function which is built in, or enable both roles as modules (USB_CHIPIDEA=m), since chipidea core driver takes care of both host and device roles. Signed-off-by: Peter Chen <peter.chen@freescale.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/chipidea')
-rw-r--r--drivers/usb/chipidea/Kconfig6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
index b2df442eb3e5..eb2aa2e5a842 100644
--- a/drivers/usb/chipidea/Kconfig
+++ b/drivers/usb/chipidea/Kconfig
@@ -12,15 +12,15 @@ if USB_CHIPIDEA
config USB_CHIPIDEA_UDC
bool "ChipIdea device controller"
- depends on USB_GADGET=y || USB_GADGET=USB_CHIPIDEA
+ depends on USB_GADGET=y || USB_CHIPIDEA=m
help
Say Y here to enable device controller functionality of the
ChipIdea driver.
config USB_CHIPIDEA_HOST
bool "ChipIdea host controller"
- depends on USB=y || USB=USB_CHIPIDEA
- depends on USB_EHCI_HCD=y
+ depends on USB=y
+ depends on USB_EHCI_HCD=y || USB_CHIPIDEA=m
select USB_EHCI_ROOT_HUB_TT
help
Say Y here to enable host controller functionality of the