Hi, gustavo panizzo <gfa@xxxxxxxxxxxx> writes: >>> On Wed, Jul 12, 2017 at 02:08:04PM +0800, Baolin Wang wrote: >>>> >>>> Hi, >>>> >>>> On 12 July 2017 at 11:52, gustavo panizzo <gfa@xxxxxxxxxxxx> wrote: >>>>> >>>>> The dwc3 could not release resources when the module is built-in >>>>> because this module does not have shutdown method. This causes the USB >>>>> 3.0 hub is not able to detect after warm boot. >>>>> >>>>> Original patch by Brian Kim, updated and submitted upstream by gustavo >>>>> panizzo. >>>>> >>>>> Also see https://bugs.debian.org/843448 >>>>> >>>>> Signed-off-by: Brian Kim <brian.kim@xxxxxxxxxxxxxx> >>>>> Signed-off-by: gustavo panizzo <gfa@xxxxxxxxxxxx> >>>>> --- >>>>> drivers/usb/dwc3/core.c | 33 +++++++++++++++++++++++++++++++++ >>>>> 1 file changed, 33 insertions(+) >>>>> >>>>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c >>>>> index 326b302fc440..f92dfe213d89 100644 >>>>> --- a/drivers/usb/dwc3/core.c >>>>> +++ b/drivers/usb/dwc3/core.c >>>>> @@ -1259,6 +1259,38 @@ static int dwc3_probe(struct platform_device >>>>> *pdev) >>>>> return ret; >>>>> } >>>>> >>>>> +static void dwc3_shutdown(struct platform_device *pdev) >>>>> +{ >>>>> + struct dwc3 *dwc = platform_get_drvdata(pdev); >>>>> + struct resource *res = platform_get_resource(pdev, >>>>> IORESOURCE_MEM, 0); >>>>> + >>>>> + pm_runtime_get_sync(&pdev->dev); >>>>> + /* >>>>> + * restore res->start back to its original value so that, in case >>>>> the >>>>> + * probe is deferred, we don't end up getting error in request >>>>> the >>>>> + * memory region the next time probe is called. >>>>> + */ >>>>> + res->start -= DWC3_GLOBALS_REGS_START; >>>>> + >>>>> + dwc3_debugfs_exit(dwc); >>>>> + dwc3_core_exit_mode(dwc); >>>>> + dwc3_event_buffers_cleanup(dwc); >>> >>> >>> What about dwc3_event_buffers_cleanup? should I remove it from >>> dwc3_shutdown()? >>> It is already in dwc3_core_exit() >> >>I think so. We should avoid duplicate code. >> >>>>> + dwc3_free_event_buffers(dwc); >>>>> + >>>>> + usb_phy_set_suspend(dwc->usb2_phy, 1); >>>>> + usb_phy_set_suspend(dwc->usb3_phy, 1); >>>>> + >>>>> + phy_power_off(dwc->usb2_generic_phy); >>>>> + phy_power_off(dwc->usb3_generic_phy); >>>> >>>> >>>> We've done these in dwc3_core_exit(). > > This is the patch after testing on a Odroid XU4, on top of linux-next > 964bcc1b4f57028d56dace7d9bc5924f2eb43f36 which translates to 4.13.0-rc1-next-20170717+ > I tested this patch for a week without problems with heavy USB and NIC usage. > Please consider merging it > > > Author: gustavo panizzo <gfa@xxxxxxxxxxxx> > Date: Wed Jul 12 11:26:55 2017 +0800 > > usb: dwc3: Fix the USB 3.0 hub detection bug after warm boot > > The dwc3 could not release resources when the module is built-in > because this module does not have shutdown method. This causes the USB > 3.0 hub is not able to detect after warm boot. > > Original patch by Brian Kim, updated and submitted upstream by gustavo > panizzo. if the original patch is from Brian, then 'Author' should be Brian. Please fix it. I also don't get why all of a sudden we need to implement ->shutdown(). Why is it that we never needed it before and we need it now? Care to bisect to find the first commit which started causing this problem? -- balbi
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