Messages in this thread | | | Date | Mon, 14 Mar 2016 10:52:12 -0500 | From | Bjorn Helgaas <> | Subject | Re: [PATCH v4 3/3] mmc: sdhci-pci: Do not set DMA mask in enable_dma() |
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On Mon, Mar 14, 2016 at 03:00:36PM +0200, Adrian Hunter wrote: > On 14/03/16 05:15, Alexandre Courbot wrote: > > On Tue, Mar 8, 2016 at 10:18 PM, Adrian Hunter <adrian.hunter@intel.com> wrote: > >> On 07/03/16 04:07, Alexandre Courbot wrote: > >>> DMA mask will already be set by sdhci_set_dma_mask(), which > >>> is equivalent to the removed code since pci_set_dma_mask() > >>> expands to its DMA-API counterpart. > >>> > >>> There should also be no reason to set the DMA mask after probe. > >> > >> Let's run that by the PCI mailing list just to be sure. The patches for > >> reference: > >> > >> http://marc.info/?l=linux-mmc&m=145731654328126&w=2 > >> http://marc.info/?l=linux-mmc&m=145731654328128&w=2 > >> > >> change the sdhci-pci driver to set the DMA mask once during probe instead of > >> every time during resume. Is there any reason a PCI device driver might > >> need to set the DMA mask every time during resume? > > > > Not seeing much reaction for this patchset. PCI being the only > > possible point of contention, can we maybe roll it into -next and see > > what happens? > > +Rafael > > Rafael, can you offer any thoughts on this: > > PCI drivers that want to use DMA might call pci_set_master() in the pm > resume callback. Some drivers (like sdhci-pci) also, presumably out of > convenience, set the DMA mask at the same time. The question is: is it OK > instead to set the DMA mask just once during probe, or is there some other > reason the DMA mask needs to be set every time during resume?
I don't see a reason why the DMA mask would need to be set during resume.
Bjorn
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