* Tony Lindgren <tony@xxxxxxxxxxx> [151021 16:44]:
> Hi all,
>
> I noticed a regresssino in v4.3-rc series to day with MUSB gadgets
> and DMA. Doing a git bisect between v4.2..v4.3-rc1 on it pointed to:
>
> ddef08dd00f5 ("Driver core: wakeup the parent device before trying probe")
>
> With the commit above reverted things work fine with DMA and USB gadgets.
>
> This is on omap3 with CONFIG_USB_INVENTRA_DMA selected. Selecting
> CONFIG_MUSB_PIO_ONLY still works even without reverting ddef08dd00f5.
>
> Anybody got ideas what might be wrong? Some wrong runtime PM usage
> under drivers/usb/musb?
Here's some more debug info on where things are different initializing
the USB gadgets. I added some printks and diffed the dmesg output. The
added calls from commit ddef08dd00f5 start with dd:
+dd __device_attach pm_runtime_put parent 480ab000.usb_otg_hs
+dd driver_probe_device pm_runtime_get_sync parent 0-0048
twl4030_usb 48070000.i2c:twl@48:twl4030-usb: Initialized TWL4030 USB module
+dd driver_probe_device pm_runtime_put parent 0-0048
+dd __device_attach pm_runtime_get_sync parent 480ab000.usb_otg_hs
+dd driver_probe_device pm_runtime_get_sync parent 480ab000.usb_otg_hs
musb musb-hdrc.0.auto _pm_runtime_get_sync
musb musb-hdrc.0.auto _pm_runtime_get_sync
musb-hdrc: ConfigData=0xde (UTMI-8, dyn FIFOs, bulk combine, bulk split, HB-ISO Rx, HB-ISO Tx, SoftConn)
@@ -273,11 +695,24 @@
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: MUSB HDRC host driver
-usb usb1: Manufacturer: Linux 4.3.0-rc6-00005-gb037ac9 musb-hcd
+usb usb1: Manufacturer: Linux 4.3.0-rc6-00005-g24b084c musb-hcd
usb usb1: SerialNumber: musb-hdrc.0.auto
+dd __device_attach pm_runtime_get_sync parent musb-hdrc.0.auto
+dd driver_probe_device pm_runtime_get_sync parent musb-hdrc.0.auto
+dd __device_attach pm_runtime_get_sync parent usb1
+dd driver_probe_device pm_runtime_get_sync parent usb1
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
+dd driver_probe_device pm_runtime_put parent usb1
+dd __device_attach pm_runtime_put parent usb1
+dd driver_probe_device pm_runtime_put parent musb-hdrc.0.auto
+dd __device_attach pm_runtime_put parent musb-hdrc.0.auto
musb musb-hdrc.0.auto _pm_runtime_put
+dd driver_probe_device pm_runtime_put parent 480ab000.usb_otg_hs
+dd __device_attach pm_runtime_put parent 480ab000.usb_otg_hs
modprobe: module 'usb_core' not found
userial_init: registered 4 ttyGS* devices
Mass Storage Function, version: 2009/09/11
The musb driver is using autosuspend like Felipe pointed out offline,
so maybe that's where things go wrong with commit ddef08dd00f5?
Regards,
Tony
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