From: Mason <slash.tmp@free.fr>
To: Bjorn Helgaas <helgaas@kernel.org>
Cc: Marc Gonzalez <marc_gonzalez@sigmadesigns.com>,
Marc Zyngier <marc.zyngier@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-pci <linux-pci@vger.kernel.org>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
LKML <linux-kernel@vger.kernel.org>,
DT <devicetree@vger.kernel.org>,
Thibaud Cornic <thibaud_cornic@sigmadesigns.com>
Subject: Re: [PATCH v9 0/3] Tango PCIe controller support
Date: Wed, 5 Jul 2017 23:59:33 +0200 [thread overview]
Message-ID: <8dcab663-245b-880a-be3a-2965fd12d663@free.fr> (raw)
In-Reply-To: <20170705213419.GD25063@bhelgaas-glaptop.roam.corp.google.com>
On 05/07/2017 23:34, Bjorn Helgaas wrote:
> On Wed, Jul 05, 2017 at 10:39:19PM +0200, Mason wrote:
>
>> On 05/07/2017 20:03, Bjorn Helgaas wrote:
>>
>>> On Wed, Jul 05, 2017 at 12:55:37AM +0200, Mason wrote:
>>>
>>>> On 04/07/2017 22:24, Bjorn Helgaas wrote:
>>>>
>>>>> I made the trivial changes I mentioned, added a dependency on
>>>>> CONFIG_BROKEN (for the config/MMIO muxing issue), and put these on
>>>>> pci/host-tango. I can't build or test this, so I probably broke
>>>>> something in the process. I think the combination of the boot-time
>>>>> warning, the taint, and CONFIG_BROKEN is a reasonable amount of
>>>>> warning that a user should expect issues.
>>>>>
>>>>> Can you take a look and see if it works for you?
>>>>>
>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/log/?h=pci/host-tango
>>>>
>>>> Thanks. I'll take it for a spin ASAP.
>>>>
>>>> TAINT_CRAP... Smirk. I didn't see that one in the docs:
>>>> https://www.kernel.org/doc/html/latest/admin-guide/tainted-kernels.html
>>>>
>>>> Oh wait... TAINT_CRAP is "C" => a staging driver has been loaded
>>>
>>> I wish it had a less pejorative, more descriptive name. But it seems like
>>> the closest to this situation.
>>
>> Maybe it is not too late to submit a patch to Linus
>> renaming TAINT_CRAP?
>>
>> Here are a few candidates, off the top of my head:
>>
>> TAINT_STAGING
>> TAINT_STAGING_DRIVER
>> TAINT_BROKEN_HW
>> TAINT_BROKEN_HARDWARE
>> TAINT_USE_AT_YOUR_OWN_RISK
>
> I personally wouldn't object, but it's not a PCI thing so that can all
> be separate from this driver.
Yes, of course. I was just asking for your (and anyone's)
opinion, as a Linux dev.
>>>> The one issue I anticipate with "depends on BROKEN" is
>>>> when I add support for revision 2, which isn't broken.
>>>
>>> How about this:
>>>
>>> - Rename PCIE_TANGO to PCIE_TANGO_REV1
>>> - PCIE_TANGO_REV1 depends on BROKEN
>>> - Add rev2 support later, enabled by PCIE_TANGO
>>> - PCIE_TANGO_REV1 depends on PCIE_TANGO && BROKEN
>>>
>>> I updated pci/host-tango along these lines (without rev2 support,
>>> obviously).
>>
>> And support for REV1 wouldn't be compiled in, unless
>> BROKEN is selected? Yes, I think that could fly.
>
> Right.
>
>> Don't you think the naming should follow the DT
>> convention of using the first SoC embedding the
>> IP (for the compatible string) ?
>>
>> PCIE_TANGO_REV1 vs PCIE_TANGO_SMP8759
>
> Sounds reasonable. So v2 will be something other than SMP8759?
> I renamed it to CONFIG_PCIE_TANGO_SMP8759.
Right, HW bugs are fixed in newer chips. Old chips rarely
get bug fixes, apparently.
> If you confirm that
> https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/commit/?h=pci/host-tango&id=d752a8b29345
> works for you, I'll include it in my v4.13 pull request.
There were a few nits I wanted to address:
- Since we added suppress_bind_attrs = true, probe()
can only be called at init, so I wanted to mark __init
all the probe functions, to save space.
- I left the definition of MSI_MAX in the wrong patch
- You put a pointer to the pdev in the struct tango_pcie.
I think this is redundant, since the pdev already has a
pointer to the struct, as drvdata.
So I wanted to change tango_msi_probe() to take a pdev
as argument (to make it more like an actual probe function)
and derive pcie from pdev, instead of the other way around.
Can I send you a patch series with these changes on Friday?
Regards.
next prev parent reply other threads:[~2017-07-05 22:00 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-20 8:12 [PATCH v9 0/3] Tango PCIe controller support Marc Gonzalez
2017-06-20 8:14 ` [PATCH v9 1/3] PCI: Add DT binding for tango PCIe controller Marc Gonzalez
2017-06-20 8:17 ` [PATCH v9 2/3] PCI: Add tango PCIe host bridge support Marc Gonzalez
2017-07-02 23:18 ` Bjorn Helgaas
2017-07-03 9:35 ` Ard Biesheuvel
2017-07-03 13:27 ` Bjorn Helgaas
2017-07-04 6:58 ` Jisheng Zhang
2017-07-04 7:16 ` Jisheng Zhang
2017-07-04 8:02 ` Ard Biesheuvel
2017-07-04 8:19 ` Jisheng Zhang
2017-07-04 9:38 ` Ard Biesheuvel
2017-07-05 13:53 ` Joao Pinto
2017-07-03 9:54 ` Marc Gonzalez
2017-07-03 13:13 ` Marc Gonzalez
2017-07-03 15:30 ` Marc Gonzalez
2017-07-04 7:09 ` Peter Zijlstra
2017-07-04 13:08 ` Mason
2017-07-04 14:27 ` Peter Zijlstra
2017-07-04 15:18 ` Mason
2017-07-03 13:40 ` Bjorn Helgaas
2017-07-03 14:34 ` Marc Gonzalez
2017-07-04 15:58 ` Bjorn Helgaas
2017-07-04 23:42 ` Mason
2017-07-03 18:11 ` Russell King - ARM Linux
2017-07-03 18:44 ` Ard Biesheuvel
2017-07-04 15:15 ` Bjorn Helgaas
2017-07-04 18:17 ` Russell King - ARM Linux
2017-07-04 23:59 ` Mason
2017-07-05 5:21 ` Greg Kroah-Hartman
2017-07-05 12:33 ` Mark Brown
2017-06-20 8:18 ` [PATCH v9 3/3] PCI: Add tango MSI controller support Marc Gonzalez
2017-07-04 20:24 ` [PATCH v9 0/3] Tango PCIe " Bjorn Helgaas
2017-07-04 22:55 ` Mason
2017-07-05 18:03 ` Bjorn Helgaas
2017-07-05 20:39 ` Mason
2017-07-05 21:34 ` Bjorn Helgaas
2017-07-05 21:59 ` Mason [this message]
2017-07-06 3:39 ` Bjorn Helgaas
2017-07-06 12:26 ` Mason
2017-07-06 12:40 ` Marc Zyngier
2017-07-06 19:46 ` Bjorn Helgaas
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