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

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Date:	Thu, 17 Jul 2014 11:11:06 -0400
From:	Murali Karicheri <m-karicheri2@...com>
To:	Mohit KUMAR DCG <Mohit.KUMAR@...com>
CC:	"Jingoo Han (jg1.han@...sung.com)" <jg1.han@...sung.com>,
	"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>,
	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>,
	Pratyush ANAND <pratyush.anand@...com>
Subject: Re: [PATCH v5 3/5] PCI: designware: enhance dw_pcie_host_init() to
 support v3.65 DW hardware

On 07/17/2014 12:18 AM, Mohit KUMAR DCG wrote:
>
>
>> -----Original Message-----
>> From: Pratyush ANAND
>> Sent: Thursday, July 17, 2014 9:07 AM
>> To: Murali Karicheri
>> Cc: linux-pci@...r.kernel.org; linux-kernel@...r.kernel.org; linux-arm-
>> kernel@...ts.infradead.org; Santosh Shilimkar; Russell King; Grant Likely; Rob
>> Herring; Mohit KUMAR DCG; Jingoo Han; Bjorn Helgaas; Richard Zhu; Kishon
>> Vijay Abraham I; Marek Vasut; Arnd Bergmann; Pawel Moll; Mark Rutland;
>> Ian Campbell; Kumar Gala; Randy Dunlap
>> Subject: Re: [PATCH v5 3/5] PCI: designware: enhance dw_pcie_host_init()
>> to support v3.65 DW hardware
>>
>> 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>
>>
>
> - Now looks fine to me.
>
> Acked-by: Mohit KUMAR<mohit.kumar@...com>
>
> Jingoo,
> After Murali's patches,  dw code can be used by  older Synopsys controller based driver too.
> Pls have a look at the series if you have any further comment.
>
> Thanks
> Mohit

Mohit,

Thanks for the review and Ack.

Murali
>
>>>   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.
>>
>> ~Pratyush

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