Hi,
On Friday, June 06, 2014 11:10:58 AM Suravee Suthikulanit wrote:
> Hans/Bartlomiej,
>
> Do you guys have any questions about this patch?
Sorry for the delay, some questions regarding the patch below.
> Thank you,
>
> Suravee
>
> On 6/3/2014 12:58 PM, Tejun Heo wrote:
> > Hans, Bartlomiej, can you guys please review this patch?
> >
> > Thanks.
> >
> > On Fri, May 23, 2014 at 12:35:10PM -0500, suravee.suthikulpa...@amd.com
> > wrote:
> >> From: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
> >>
> >> The current platform AHCI drier does not set the dma_mask correctly
> >> for 64-bit DMA capable AHCI controller. This patch checks the AHCI
> >> capability bit and set the dma_mask and coherent_dma_mask accordingly.
> >>
> >> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
> >> ---
> >> drivers/ata/libahci_platform.c | 9 +++++++++
> >> 1 file changed, 9 insertions(+)
> >>
> >> diff --git a/drivers/ata/libahci_platform.c
> >> b/drivers/ata/libahci_platform.c
> >> index 7cb3a85..85049ef 100644
> >> --- a/drivers/ata/libahci_platform.c
> >> +++ b/drivers/ata/libahci_platform.c
> >> @@ -368,6 +368,15 @@ int ahci_platform_init_host(struct platform_device
> >> *pdev,
> >> ahci_init_controller(host);
> >> ahci_print_info(host, "platform");
> >>
> >> + if (hpriv->cap & HOST_CAP_64) {
> >> + if (!dev->dma_mask)
What configuration is the above dev->dma_mask checking supposed to handle?
Is it really needed? If not the current dma_set_mask_and_coherent() call
can be replaced by dma_coerce_mask_and_coherent() one.
> >> + dev->dma_mask = &dev->coherent_dma_mask;
> >> +
> >> + rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
> >> + if (rc)
> >> + return rc;
Shouldn't we try to set DMA masks to 32-bit ones on error (like it is done
in ahci_configure_dma_masks()) instead of failing the initialization?
> >> + }
> >> +
> >> return ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
> >> &ahci_platform_sht);
> >> }
> >> --
> >> 1.9.0
BTW It seems that after DMA masks handling is fixed in the generic AHCI
platform code the driver specific code in ahci_xgene.c can be removed.
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
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