linux-kernel - Re: [PATCH] ARM: PCI: Use PCI_CLASS

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Message-ID: <53FAFBBC.3070100@huawei.com>
Date:	Mon, 25 Aug 2014 17:02:52 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Rostislav Lisovy <lisovy@...il.com>,
	Sasha Levin <sashal@...nel.org>
CC:	Russell King <linux@....linux.org.uk>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	Nicholas Krause <xerofoify@...il.com>
Subject: Re: [PATCH] ARM: PCI: Use PCI_CLASS_* defines for PCI class

On 2014/8/25 16:39, Rostislav Lisovy wrote:
> On Mon, 2014-08-04 at 11:31 +0200, Rostislav Lisovy wrote:
>> On Sun, 2014-08-03 at 09:16 -0400, Sasha Levin wrote:
>>>> -     /* FIXME: add defines for class 0x68000 and 0x80103 */
>>>>       if ((dev->class >> 8) == PCI_CLASS_BRIDGE_HOST ||
>>>> -         dev->class == 0x68000 ||
>>>> -         dev->class == 0x80103) {
>>>> +         dev->class == (PCI_CLASS_BRIDGE_OTHER << 8) ||
>>>> +         dev->class == ((PCI_CLASS_SYSTEM_DMA << 8) | 0x03)) {
>>>>               for (i = 0; i < PCI_NUM_RESOURCES; i++) {
>>>>                       dev->resource[i].start = 0;
>>>>                       dev->resource[i].end   = 0;
>>>>
>>>
>>> Care to explain how your new code is equivalent to the old one?
>>
>> The header file include/linux/pci_ids.h defines
>> #define PCI_CLASS_BRIDGE_OTHER          0x0680
>> #define PCI_CLASS_SYSTEM_DMA            0x0801
>>
>> ((struct pci_dev*)dev)->class
>> corresponds to the 3 bytes Class code in the PCI Configuration space
>> header -- 1B Base class, 1B Sub-class, 1B Reg-level interface.
>>
>> In that case
>> (PCI_CLASS_BRIDGE_OTHER << 8)
>> is equivalent to 0x68000 (imagine the leading zero)
>> and
>> ((PCI_CLASS_SYSTEM_DMA << 8) | 0x03))
>> is equivalent to 0x80103.
>>
> 
> Just a kind reminder in case anyone is interested in reviewing and
> accepting the patch.

Reviewed-by : Yijing Wang <wangyijing@...wei.com>

> 
> Best regards;
> Rostislav Lisovy
> 
> 
> 
> .
> 


-- 
Thanks!
Yijing

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