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From: Vinod Koul <vkoul@kernel.org>
To: Mathias Nyman <mathias.nyman@linux.intel.com>
Cc: Christian Lamparter <chunkeey@gmail.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	John Stultz <john.stultz@linaro.org>,
	Mathias Nyman <mathias.nyman@intel.com>,
	linux-arm-msm@vger.kernel.org,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	USB list <linux-usb@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Alan Stern <stern@rowland.harvard.edu>,
	Heikki Krogerus <heikki.krogerus@linux.intel.com>
Subject: Re: [PATCH v6 0/5] usb: xhci: Add support for Renesas USB controllers
Date: Thu, 12 Mar 2020 12:26:36 +0530	[thread overview]
Message-ID: <20200312065636.GX4885@vkoul-mobl> (raw)
In-Reply-To: <1ce257f5-df10-73ac-53ea-1c771abe70f2@linux.intel.com>

On 04-02-20, 18:33, Mathias Nyman wrote:

> > > 
> > > There are a few other opens regarding this series. Mostly because I'm not (yet)
> > > familiar with all the details, so I'll just just list them here.
> > > 
> > > - Is it really enough to add the Renesas driver to Makefile before xhci-pci
> > >    driver to make sure it gets matched and probed based on vendor/device id
> > >    before xhci-pci driver is matched and probed based on pci class?
> > >    What if the Renesas driver is a module and xhci-pci compiled in?
> > 
> > The driver loading rules are based on level and makefile order. So
> > renesas will always be loaded before xhci driver. This is required since
> > xhci claims all devices, so we need to make sure it loads before.
> > 
> > I think we should make it inbuilt driver rather than a module. xhci
> > driver is only inbuilt.
> > 
> > If there is a better way to handle this, am all for it.
> > 
> > > - Previously probe didn't return before hcd's were added and everything set up.
> > >    Now with request_firmware_nowait() probe returns early successfully, and the
> > >    old xhci_pci_probe() which sets up everything is called later by the request
> > >    firmware callback. So there could be whole new set of races possible.
> > >    For example pci remove can be called mid firmware loading, or when the old
> > >    xhci_pci_probe is still setting up things.
> > 
> > I think this is a valid concern. Let me think about how to solve this..
> > maybe add a flag in remove which ensure remove doesnt run untill the
> > probe/firmware callback is completed.
> 
> How about initiating async firmware loading before probe is called by using
> DECLARE_PCI_FIXUP_*() hooks?

Well somehow that does not work :(

I tried using DECLARE_PCI_FIXUP_FINAL hook to request the firmware.
Doing so from probe works but from fixup fails always!

So expect this one, I have done the rest of the changes requested, will
send them over soon

Thanks
-- 
~Vinod

  reply	other threads:[~2020-03-12  6:56 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-13  8:40 Vinod Koul
2020-01-13  8:40 ` [PATCH v6 1/5] usb: xhci: export few functions Vinod Koul
2020-01-13  8:40 ` [PATCH v6 2/5] usb: renesas-xhci: Add the renesas xhci driver Vinod Koul
2020-01-13  8:40 ` [PATCH v6 3/5] usb: renesas-xhci: Add ROM loader for uPD720201 Vinod Koul
2020-01-13  8:40 ` [PATCH v6 4/5] usb: renesas-xhci: allow multiple firmware versions Vinod Koul
2020-01-13  8:40 ` [PATCH v6 5/5] usb: xhci: provide a debugfs hook for erasing rom Vinod Koul
2020-01-13 20:09 ` [PATCH v6 0/5] usb: xhci: Add support for Renesas USB controllers John Stultz
2020-01-13 20:33   ` Christian Lamparter
2020-01-21  6:46     ` Vinod Koul
2020-01-21 20:26       ` Christian Lamparter
2020-01-24 21:38         ` Christian Lamparter
2020-01-25  5:32           ` Vinod Koul
2020-01-30 17:07             ` Mathias Nyman
2020-01-31  8:40               ` Vinod Koul
2020-02-04 16:33                 ` Mathias Nyman
2020-03-12  6:56                   ` Vinod Koul [this message]
2020-01-31 15:47               ` Alan Stern
2020-03-10 11:55                 ` Vinod Koul
2020-01-26  0:11 ` Andreas Böhler
2020-01-26 13:07   ` Christian Lamparter

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