linux-kernel - Re: [PATCH v7 2/3] dwc: PCI: intel: PCIe RC controller driver

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Date:   Mon, 18 Nov 2019 15:58:53 +0800
From:   Dilip Kota <eswara.kota@...ux.intel.com>
To:     Jingoo Han <jingoohan1@...il.com>,
        "gustavo.pimentel@...opsys.com" <gustavo.pimentel@...opsys.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "andrew.murray@....com" <andrew.murray@....com>,
        "helgaas@...nel.org" <helgaas@...nel.org>,
        "robh@...nel.org" <robh@...nel.org>,
        "martin.blumenstingl@...glemail.com" 
        <martin.blumenstingl@...glemail.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "andriy.shevchenko@...el.com" <andriy.shevchenko@...el.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "cheol.yong.kim@...el.com" <cheol.yong.kim@...el.com>,
        "chuanhua.lei@...ux.intel.com" <chuanhua.lei@...ux.intel.com>,
        "qi-ming.wu@...el.com" <qi-ming.wu@...el.com>
Subject: Re: [PATCH v7 2/3] dwc: PCI: intel: PCIe RC controller driver


On 11/16/2019 4:40 AM, Jingoo Han wrote:
> On 11/14/19, 9:31 PM, Dilip Kota wrote:
>
>> Add support to PCIe RC controller on Intel Gateway SoCs.
>> PCIe controller is based of Synopsys DesignWare PCIe core.
>>
>> Intel PCIe driver requires Upconfigure support, Fast Training
>> Sequence and link speed configurations. So adding the respective
>> helper functions in the PCIe DesignWare framework.
>> It also programs hardware autonomous speed during speed
>> configuration so defining it in pci_regs.h.
>>
>> Signed-off-by: Dilip Kota <eswara.kota@...ux.intel.com>
>> Reviewed-by: Andrew Murray <andrew.murray@....com>
>> Acked-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
>> ---
> [.....]
>
>>   drivers/pci/controller/dwc/Kconfig           |  10 +
>>   drivers/pci/controller/dwc/Makefile          |   1 +
>>   drivers/pci/controller/dwc/pcie-designware.c |  57 +++
>>   drivers/pci/controller/dwc/pcie-designware.h |  12 +
>>   drivers/pci/controller/dwc/pcie-intel-gw.c   | 542 +++++++++++++++++++++++++++
>>   include/uapi/linux/pci_regs.h                |   1 +
>>   6 files changed, 623 insertions(+)
>>   create mode 100644 drivers/pci/controller/dwc/pcie-intel-gw.c
>>
>> diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
>> index 0ba988b5b5bc..fb6d474477df 100644
>> --- a/drivers/pci/controller/dwc/Kconfig
>> +++ b/drivers/pci/controller/dwc/Kconfig
>> @@ -82,6 +82,16 @@ config PCIE_DW_PLAT_EP
>>   	  order to enable device-specific features PCI_DW_PLAT_EP must be
>>   	  selected.
>>   
>> +config PCIE_INTEL_GW
>> +	bool "Intel Gateway PCIe host controller support"
>> +	depends on OF && (X86 || COMPILE_TEST)
>> +	select PCIE_DW_HOST
>> +	help
>> +	  Say 'Y' here to enable PCIe Host controller support on Intel
>> +	  Gateway SoCs.
>> +	  The PCIe controller uses the DesignWare core plus Intel-specific
>> +	  hardware wrappers.
>> +
> Please add this config alphabetical order!
> So, this config should be after 'config PCI_IMX6'.
> There is no reason to put this config at the first place.
>
>>   config PCI_EXYNOS
>>   	bool "Samsung Exynos PCIe controller"
>>   	depends on SOC_EXYNOS5440 || COMPILE_TEST
>> diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
>> index b30336181d46..99db83cd2f35 100644
>> --- a/drivers/pci/controller/dwc/Makefile
>> +++ b/drivers/pci/controller/dwc/Makefile
>> @@ -3,6 +3,7 @@ obj-$(CONFIG_PCIE_DW) += pcie-designware.o
>>   obj-$(CONFIG_PCIE_DW_HOST) += pcie-designware-host.o
>>   obj-$(CONFIG_PCIE_DW_EP) += pcie-designware-ep.o
>>   obj-$(CONFIG_PCIE_DW_PLAT) += pcie-designware-plat.o
>> +obj-$(CONFIG_PCIE_INTEL_GW) += pcie-intel-gw.o
> Ditto.
PCIE_INTEL_GW wouldnt come after PCI_IMX6, the complete Makefile and 
Kconfig are not in order,( PCI_* and PCIE_* are not in any order). So i 
just followed PCIE_DW and placed PCIE_INTEL_GW after PCIE_DW as I is 
after D (and i see PCI_* immediately after the PCIE_DW*, so i placed 
PCIE_INTEL_GW after PCIE_DW* and before PCI_*).

Regards,
Dilip

>
> Best regards,
> Jingoo Han
>
>>   obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o
>>   obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
>>   obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
>> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
>> index 820488dfeaed..479e250695a0 100644
> [.....]