Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx> writes:
> On 9/6/19 3:43 PM, Mika Westerberg wrote:
>> On Fri, Sep 06, 2019 at 03:40:29PM +0300, Jarkko Nikula wrote:
>>> I failed to notice the pci_set_master() call is needless in the
>>> commit 21aa3983d619 ("i2c: designware-pci: Switch over to MSI interrupts")
>>> due the fact driver don't support DMA.
>>
>> Hmm, MSI still needs bus mastering to be enabled, no?
>>
> At least Documentation/PCI/msi-howto.rst doesn't mention it and I think
> I saw some commit adding MSI support without pci_set_master() but I'll
> dig more.
Read PCI documentation (see attached)
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-- balbi
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