linux-kernel - Re: [PATCH v4 5/6] PCI: update dma configuration from DT

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Date:	Mon, 26 Jan 2015 18:28:54 -0500
From:	Murali Karicheri <m-karicheri2@...com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	<devicetree@...r.kernel.org>, <iommu@...ts.linux-foundation.org>,
	Joerg Roedel <joro@...tes.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Will Deacon <will.deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Subject: Re: [PATCH v4 5/6] PCI: update dma configuration from DT

On 01/23/2015 06:27 PM, Bjorn Helgaas wrote:
> On Fri, Jan 23, 2015 at 05:32:38PM -0500, Murali Karicheri wrote:
>> If there is a DT node available for the root bridge's parent device,
>> use the dma configuration from that device node. For example, keystone
>> PCI devices would require dma_pfn_offset to be set correctly in the
>> device structure of the pci device in order to have the correct dma mask.
>> The DT node will have dma-ranges defined for this. Also support using
>> the DT property dma-coherent to allow coherent DMA operation by the
>> PCI device.
>>
>> This patch use the new helper function of_pci_dma_configure() to update
>> the device dma configuration.
>>
>> Cc: Joerg Roedel<joro@...tes.org>
>> Cc: Grant Likely<grant.likely@...aro.org>
>> Cc: Rob Herring<robh+dt@...nel.org>
>> Cc: Bjorn Helgaas<bhelgaas@...gle.com>
>> Cc: Will Deacon<will.deacon@....com>
>> Cc: Russell King<linux@....linux.org.uk>
>> Cc: Arnd Bergmann<arnd@...db.de>
>> Cc: Suravee Suthikulpanit<Suravee.Suthikulpanit@....com>
>>
>> Signed-off-by: Murali Karicheri<m-karicheri2@...com>
>
> I assume this series will be merged via some non-PCI tree, so:

Not sure who will pick this. Since this is for PCI, will it be possible 
to apply this to arm-pci/next?

>
> Acked-by: Bjorn Helgaas<bhelgaas@...gle.com>

I will add your ack for v5.

Murali
>
>> ---
>>   drivers/pci/probe.c |    2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
>> index 23212f8..d7dcd6c 100644
>> --- a/drivers/pci/probe.c
>> +++ b/drivers/pci/probe.c
>> @@ -6,6 +6,7 @@
>>   #include<linux/delay.h>
>>   #include<linux/init.h>
>>   #include<linux/pci.h>
>> +#include<linux/of_pci.h>
>>   #include<linux/pci_hotplug.h>
>>   #include<linux/slab.h>
>>   #include<linux/module.h>
>> @@ -1520,6 +1521,7 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
>>   	dev->dev.dma_mask =&dev->dma_mask;
>>   	dev->dev.dma_parms =&dev->dma_parms;
>>   	dev->dev.coherent_dma_mask = 0xffffffffull;
>> +	of_pci_dma_configure(dev);
>>
>>   	pci_set_dma_max_seg_size(dev, 65536);
>>   	pci_set_dma_seg_boundary(dev, 0xffffffff);
>> --
>> 1.7.9.5
>>


-- 
Murali Karicheri
Linux Kernel, Texas Instruments
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