linux-kernel - Re: [PATCH 3/3] PCI: Cadence: Remove using "cdns,max-outbound-regions" DT property

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Message-ID: <27e3eb0b-c7d0-7eb7-1fb8-1f98b729513a@ti.com>
Date:   Fri, 27 Mar 2020 20:57:00 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Bjorn Helgaas <helgaas@...nel.org>
CC:     Tom Joseph <tjoseph@...ence.com>, Rob Herring <robh+dt@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Mark Rutland <mark.rutland@....com>,
        <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] PCI: Cadence: Remove using
 "cdns,max-outbound-regions" DT property

Hi Bjorn,

On 3/27/2020 8:24 PM, Bjorn Helgaas wrote:
> Update subject to match capitalization of others:
> 
>   PCI: cadence: Remove "cdns,max-outbound-regions" DT property
> 
> On Fri, Mar 27, 2020 at 04:17:27PM +0530, Kishon Vijay Abraham I wrote:
>> "cdns,max-outbound-regions" device tree property provides the
>> maximum number of outbound regions supported by the Host PCIe
>> controller. However the outbound regions are configured based
>> on what is populated in the "ranges" DT property.
> 
> Looks like this is missing a blank line here?  Or it should be
> rewrapped as part of the above paragraph?  I think the below makes
> more sense as a separate paragraph, though.

I'll add a blank line for the next paragraph and re-post once I get Ack from
Rob on the DT binding patch.

Thanks for reviewing!

Regards
Kishon
> 
> Again, thanks for doing this; this is a great cleanup.
> 
>> Avoid using two properties for configuring outbound regions and
>> use only "ranges" property instead.
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>>  drivers/pci/controller/cadence/pcie-cadence-host.c | 6 ------
>>  drivers/pci/controller/cadence/pcie-cadence.h      | 2 --
>>  2 files changed, 8 deletions(-)
>>
>> diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c
>> index 60f912a657b9..8f72967f298f 100644
>> --- a/drivers/pci/controller/cadence/pcie-cadence-host.c
>> +++ b/drivers/pci/controller/cadence/pcie-cadence-host.c
>> @@ -140,9 +140,6 @@ static int cdns_pcie_host_init_address_translation(struct cdns_pcie_rc *rc)
>>  	for_each_of_pci_range(&parser, &range) {
>>  		bool is_io;
>>  
>> -		if (r >= rc->max_regions)
>> -			break;
>> -
>>  		if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_MEM)
>>  			is_io = false;
>>  		else if ((range.flags & IORESOURCE_TYPE_BITS) == IORESOURCE_IO)
>> @@ -221,9 +218,6 @@ int cdns_pcie_host_setup(struct cdns_pcie_rc *rc)
>>  	pcie = &rc->pcie;
>>  	pcie->is_rc = true;
>>  
>> -	rc->max_regions = 32;
>> -	of_property_read_u32(np, "cdns,max-outbound-regions", &rc->max_regions);
>> -
>>  	if (!of_pci_dma_range_parser_init(&parser, np))
>>  		if (of_pci_range_parser_one(&parser, &range))
>>  			rc->no_bar_nbits = ilog2(range.size);
>> diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
>> index a2b28b912ca4..6bd89a21bb1c 100644
>> --- a/drivers/pci/controller/cadence/pcie-cadence.h
>> +++ b/drivers/pci/controller/cadence/pcie-cadence.h
>> @@ -251,7 +251,6 @@ struct cdns_pcie {
>>   * @bus_range: first/last buses behind the PCIe host controller
>>   * @cfg_base: IO mapped window to access the PCI configuration space of a
>>   *            single function at a time
>> - * @max_regions: maximum number of regions supported by the hardware
>>   * @no_bar_nbits: Number of bits to keep for inbound (PCIe -> CPU) address
>>   *                translation (nbits sets into the "no BAR match" register)
>>   * @vendor_id: PCI vendor ID
>> @@ -262,7 +261,6 @@ struct cdns_pcie_rc {
>>  	struct resource		*cfg_res;
>>  	struct resource		*bus_range;
>>  	void __iomem		*cfg_base;
>> -	u32			max_regions;
>>  	u32			no_bar_nbits;
>>  	u16			vendor_id;
>>  	u16			device_id;
>> -- 
>> 2.17.1
>>