linux-kernel - Re: [PATCH v5 3/5] PCI: designware: enhance dw_pcie_host

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Date:	Thu, 17 Jul 2014 11:04:51 -0400
From:	Murali Karicheri <m-karicheri2@...com>
To:	Pratyush Anand <pratyush.anand@...com>
CC:	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Russell King <linux@....linux.org.uk>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Mohit KUMAR DCG <Mohit.KUMAR@...com>,
	Jingoo Han <jg1.han@...sung.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Richard Zhu <r65037@...escale.com>,
	Kishon Vijay Abraham I <kishon@...com>,
	Marek Vasut <marex@...x.de>, Arnd Bergmann <arnd@...db.de>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH v5 3/5] PCI: designware: enhance dw_pcie_host_init() to
 support v3.65 DW hardware

On 07/16/2014 11:36 PM, Pratyush Anand wrote:
> On Thu, Jul 17, 2014 at 12:38:04AM +0800, Murali Karicheri wrote:
>> keystone PCI controller is based on v3.65 designware hardware. This
>> version differs from newer versions of the hardware in few functional
>> areas discussed below that makes it necessary to change dw_pcie_host_init()
>> to support v3.65 based PCI controller.
>>
>>   1. No support for ATU port. So any ATU specific resource handling code
>>      is to be bypassed for v3.65 h/w.
>>   2. MSI controller uses Application space to implement MSI and 32 MSI
>>      interrupts are multiplexed over 8 IRQs to the host. Hence the code
>>      to process MSI IRQ needs to be different. This patch allows platform
>>      driver to provide its own irq_domain_ops ptr to irq_domain_add_linear()
>>      through an API callback from the designware core driver.
>>   3. MSI interrupt generation requires EP to write to the RC's application
>>      register. So enhance the driver to allow setup of inbound access to
>>      MSI irq register as a post scan bus API callback.
>>
>> Signed-off-by: Murali Karicheri<m-karicheri2@...com>
> Looks almost ok to me.
>
> Reviewed-by: Pratyush Anand<pratyush.anand@...com>
>
>>   int __init dw_pcie_host_init(struct pcie_port *pp)
>>   {
>>   	struct device_node *np = pp->dev->of_node;
>> -	struct of_pci_range range;
>>   	struct of_pci_range_parser parser;
>> +	struct of_pci_range range;
> You may avoid moving the above line.
Thought the variables are to be sorted. I can fix this when I resend it 
today with your reviewed by and Mohit's Ack.

Regards,

Murali
> ~Pratyush

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