linux-kernel - Re: [PATCH v2 03/15] MIPS: PCI: Compatibility with ARM-like PCI host drivers

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Date:	Tue, 29 Mar 2016 16:19:44 -0700
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Paul Burton <paul.burton@...tec.com>, linux-mips@...ux-mips.org,
	Ralf Baechle <ralf@...ux-mips.org>
Cc:	Joshua Kinard <kumba@...too.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Zubair Lutfullah Kakakhel <Zubair.Kakakhel@...tec.com>,
	Jens Axboe <axboe@...com>, linux-kernel@...r.kernel.org,
	Yijing Wang <wangyijing@...wei.com>,
	John Crispin <blogic@...nwrt.org>,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH v2 03/15] MIPS: PCI: Compatibility with ARM-like PCI host
 drivers

Le 03/02/2016 03:30, Paul Burton a écrit :
> Introduce support for struct hw_pci & the associated pci_common_init_dev
> function as used by the PCI drivers written for ARM platforms under
> drivers/pci. This is in preparation for reusing the xilinx-pcie driver
> on the MIPS Boston board.
> 
> Platforms that make use of this more generic code will need to select
> CONFIG_MIPS_GENERIC_PCI. Platforms which don't will continue to work as
> they have, with the intent that PCI drivers be migrated towards struct
> hw_pci & drivers/pci/ over time.
> 
> Signed-off-by: Paul Burton <paul.burton@...tec.com>
> ---

[snip]

> +		if (hw->preinit)
> +			hw->preinit();
> +
> +		ret = hw->setup(i, &ctl->sysdata);
> +		if (ret < 0) {

This needs to be ret <= 0 to be compliant with what ARM PCI host
controllers do, which is return 1 in case they could get hw->setup to
finish with success, and 0 or negative if they could not, see
arch/arm/kernel/bios32.c.
-- 
Florian