In a couple of places, we were checking qtd->urb for NULL after
we had already dereferenced it. Fix this by moving the check to
before the dereference.
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
According to the spec for the DWC2 controller, when the PRTINT interrupt fires,
the application must clear the appropriate status bit in the Host Port Control
and Status register to clear this bit.
When disconnecting an A-cable when the dwc2 host driver, the PRTINT fires, but
only the GINTSTS_PRTINT status is cleared, no action is done with the HPRT0
register. The HPRT0_ENACHG bit in the HPRT0 must also be poked to correctly
clear the GINTSTS_PRTINT interrupt.
I am seeing this behavoir on v2.93 of the DWC2 IP. When I disconnect an OTG
A-cable adapter, the PRTINT interrupt fires when the DWC2 is in device mode
and is never cleared.
This patch adds the function to read the HPRT0 register when the PRTINT fires
and the dwc2 IP has already transitioned to device mode. This function is only
clearing the HPRT0_ENACHG bit for now, but can be modified to handle more.
Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
[ paulz: modified patch to preserve HPRT0_ENA bit ]
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The move from the staging tree to the main tree exposed a
longstanding memory corruption bug in the dwc2 driver. The
reordering of the driver initialization caused the dwc2 driver
to corrupt the initialization data of the sdhci driver on the
Raspberry Pi platform, which made the bug show up.
The error is in calling to_usb_device(hsotg->dev), since ->dev
is not a member of struct usb_device. The easiest fix is to
just remove the offending code, since it is not really needed.
Thanks to Stephen Warren for tracking down the cause of this.
Reported-by: Andre Heider <a.heider@gmail.com>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Commit beb7e592bc "staging: dwc2: add check on dwc2_core_reset
return" broke the B -> A role switching on OTG-enabled platforms.
This commit fixes it.
Reported-by: Dinh Nguyen <dinguyen@altera.com>
Tested-by: Dinh Nguyen <dinguyen@altera.com>
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Add usb_disabled() check to prevent kernel oops when booting with "nousb"
in the cmdline:
Unable to handle kernel NULL pointer dereference at virtual address 00000030
...
PC is at bus_add_device+0xe0/0x18c
LR is at device_add_groups+0x1c/0x20
...
[<c02191c0>] (bus_add_device) from [<c0217130>] (device_add+0x41c/0x538)
[<c0217130>] (device_add) from [<c023b1d4>] (usb_new_device+0x270/0x35c)
[<c023b1d4>] (usb_new_device) from [<c0241174>] (usb_add_hcd+0x4fc/0x760)
[<c0241174>] (usb_add_hcd) from [<c0254ce0>] (dwc2_hcd_init+0x434/0x510)
[<c0254ce0>] (dwc2_hcd_init) from [<c02594f4>] (dwc2_driver_probe+0x130/0x170)
[<c02594f4>] (dwc2_driver_probe) from [<c021bbd0>] (platform_drv_probe+0x28/0x58)
Signed-off-by: Andre Heider <a.heider@gmail.com>
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Here's the big USB pull request for 3.14-rc1
Lots of little things all over the place, and the usual USB gadget
updates, and XHCI fixes (some for an issue reported by a lot of people.)
USB PHY updates as well as chipidea updates and fixes.
All of these have been in the linux-next tree with no reported issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB updates from Greg KH:
"Here's the big USB pull request for 3.14-rc1
Lots of little things all over the place, and the usual USB gadget
updates, and XHCI fixes (some for an issue reported by a lot of
people). USB PHY updates as well as chipidea updates and fixes.
All of these have been in the linux-next tree with no reported issues"
* tag 'usb-3.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (318 commits)
usb: chipidea: udc: using MultO at TD as real mult value for ISO-TX
usb: chipidea: need to mask INT_STATUS when write otgsc
usb: chipidea: put hw_phymode_configure before ci_usb_phy_init
usb: chipidea: Fix Internal error: : 808 [#1] ARM related to STS flag
usb: chipidea: imx: set CI_HDRC_IMX28_WRITE_FIX for imx28
usb: chipidea: add freescale imx28 special write register method
usb: ehci: add freescale imx28 special write register method
usb: core: check for valid id_table when using the RefId feature
usb: cdc-wdm: resp_count can be 0 even if WDM_READ is set
usb: core: bail out if user gives an unknown RefId when using new_id
usb: core: allow a reference device for new_id
usb: core: add sanity checks when using bInterfaceClass with new_id
USB: image: correct spelling mistake in comment
USB: c67x00: correct spelling mistakes in comments
usb: delete non-required instances of include <linux/init.h>
usb:hub set hub->change_bits when over-current happens
Revert "usb: chipidea: imx: set CI_HDRC_IMX28_WRITE_FIX for imx28"
xhci: Set scatter-gather limit to avoid failed block writes.
xhci: Avoid infinite loop when sg urb requires too many trbs
usb: gadget: remove unused variable in gr_queue_int()
...
The DWC2 driver should now be in good enough shape to move out of
staging. I have stress tested it overnight on RPI running mass
storage and Ethernet transfers in parallel, and for several days
on our proprietary PCI-based platform.
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Cc: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Paul Zimmerman