Hi,
On 04-04-15 16:02, Paul Kocialkowski wrote:
Le samedi 04 avril 2015 à 15:48 +0200, Hans de Goede a écrit :
Hi,
On 04-04-15 15:42, Paul Kocialkowski wrote:
Le dimanche 29 mars 2015 à 13:18 +0200, Hans de Goede a écrit :
Hi,
On 28-03-15 18:26, Paul Kocialkowski wrote:
musb might be used in gadget mode on sunxi, so we don't want to assume anything related to host mode, especially USB keyboard support. Thus, there is no reason to keep USB_KEYBOARD always enabled and in Kconfig: it is much better fit to enable it in the common sunxi config header, when needed (some devices also have no USB support at all).
In case gadget mode is not explicitly enabled, this will fallback to host mode.
Signed-off-by: Paul Kocialkowski contact@paulk.fr
Nack, I'm not going to take any patch which removes config USB_KEYBOARD, having USB_KEYBOARD always enabled on devices with usb host capability causes a significant penalty in boot time, and some people may want to turn it off because of that.
Actually, I said I would give up on this, but there are still parts of that patch that I need for USB gadget (not related to USB keyboard).
Regarding USB keyboard, the best solution IMO would be to set it disabled by default in board/sunxi/Kconfig (both because of the boot time penality and because it's not relevant when using gadget mode) and have it enabled individually in each configs/*_defconfig that uses USB in host mode.
We try to offer the best ootb experience with the defconfigs and many users will not have serial consoles attached, so we really want usb-keyboard by default. Actually we can currently already use host mode on ehci and gadget mode on musb and then we still want usb-keyboard and that is how I expect the majority of the boards to eventually be configured ootb.
I hadn't thought of that, it makes sense.
The only time when we do not want USB_KEYBOARD is when we've no usb hosts at all because that will cause linking errors, this should go away once we move over usb to the device model which will happen soon.
Of course, the best solution would be to have USB keyboard enabled but not used at run-time when there is no host available at all.
I'm happy to take patches you need to enable gadget mode, but I do not think it is a good idea to flip the the default and then add CONFIG_USB_KEYBOARD=y to pretty much every one of our 55 defconfig files.
Well, the long way to do it without modifying each board would be to:
- switch USB_EHCI to Kconfig
- switch MUSB_HOST and MUSB_GADGET to Kconfig
- default MUSB_GADGET to n
- default MUSB_HOST to y if !MUSB_GADGET
- default USB_KEYBORAD to y if USB_EHCI || MUSB_HOST
That way, we don't have to change the defconfigs and my problem is solved. What do you think?
This would also be one more step to eliminating CONFIG_SYS_EXTRA_OPTIONS, which is not a bad thing.
This sounds good to me, note there already is a USB_EHCI_HCD Kconfig which does what you want in drivers/usb/host/Kconfig (it automatically defines CONFIG_USB_EHCI to keep non converted boards working).
So step 1 would be a patch moving sunxi over to stop setting USB_EHCI in CONFIG_SYS_EXTRA_OPTIONS and instead have it use define USB_ARCH_HAS_HCD and use USB_EHCI_HCD please set USB_EHCI_HCD by default in board/sunxi/Kconfig like how we also set a default for e.g. SYS_CLK_FREQ, I think in the initial patch it should have a default of: default y And then later be changed to: default y if !MUSB_HOST
As for moving MUSB_HOST / GADGET to Kconfig please coordinate that with Marek.
Regards,
Hans