linux-kernel - Re: [PATCH V4 5/5] PCI: tegra: Add support for PCIe endpoint mode in Tegra194

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Date:   Tue, 3 Mar 2020 14:38:54 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     lorenzo.pieralisi@....com, bhelgaas@...gle.com, robh+dt@...nel.org,
        jonathanh@...dia.com, andrew.murray@....com, kishon@...com,
        gustavo.pimentel@...opsys.com, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kthota@...dia.com, mmaddireddy@...dia.com, sagar.tv@...il.com
Subject: Re: [PATCH V4 5/5] PCI: tegra: Add support for PCIe endpoint mode in
 Tegra194

On Tue, Mar 03, 2020 at 04:24:18PM +0530, Vidya Sagar wrote:
> Add support for the endpoint mode of Synopsys DesignWare core based
> dual mode PCIe controllers present in Tegra194 SoC.
> 
> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
> ---
> V4:
> * Addressed Lorenzo's review comments
> * Started using threaded irqs instead of kthreads
> 
> V3:
> * Addressed Thierry's review comments
> 
> V2:
> * Addressed Bjorn's review comments
> * Made changes as part of addressing review comments for other patches
> 
>  drivers/pci/controller/dwc/Kconfig         |  30 +-
>  drivers/pci/controller/dwc/pcie-tegra194.c | 681 ++++++++++++++++++++-
>  2 files changed, 693 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
> index 0830dfcfa43a..169cde58dd92 100644
> --- a/drivers/pci/controller/dwc/Kconfig
> +++ b/drivers/pci/controller/dwc/Kconfig
> @@ -248,14 +248,38 @@ config PCI_MESON
>  	  implement the driver.
>  
>  config PCIE_TEGRA194
> -	tristate "NVIDIA Tegra194 (and later) PCIe controller"
> +	tristate
> +
> +config PCIE_TEGRA194_HOST
> +	tristate "NVIDIA Tegra194 (and later) PCIe controller - Host Mode"
>  	depends on ARCH_TEGRA_194_SOC || COMPILE_TEST
>  	depends on PCI_MSI_IRQ_DOMAIN
>  	select PCIE_DW_HOST
>  	select PHY_TEGRA194_P2U
> +	select PCIE_TEGRA194
> +	default y
> +	help
> +	  Enables support for the PCIe controller in the NVIDIA Tegra194 SoC to
> +	  work in host mode. There are two instances of PCIe controllers in
> +	  Tegra194. This controller can work either as EP or RC. In order to
> +	  enable host-specific features PCIE_TEGRA194_HOST must be selected and
> +	  in order to enable device-specific features PCIE_TEGRA194_EP must be
> +	  selected. This uses the DesignWare core.
> +
> +config PCIE_TEGRA194_EP
> +	tristate "NVIDIA Tegra194 (and later) PCIe controller - Endpoint Mode"
> +	depends on ARCH_TEGRA_194_SOC || COMPILE_TEST
> +	depends on PCI_ENDPOINT
> +	select PCIE_DW_EP
> +	select PHY_TEGRA194_P2U
> +	select PCIE_TEGRA194
>  	help
> -	  Say Y here if you want support for DesignWare core based PCIe host
> -	  controller found in NVIDIA Tegra194 SoC.
> +	  Enables support for the PCIe controller in the NVIDIA Tegra194 SoC to
> +	  work in host mode. There are two instances of PCIe controllers in
> +	  Tegra194. This controller can work either as EP or RC. In order to
> +	  enable host-specific features PCIE_TEGRA194_HOST must be selected and
> +	  in order to enable device-specific features PCIE_TEGRA194_EP must be
> +	  selected. This uses the DesignWare core.
>  
>  config PCIE_UNIPHIER
>  	bool "Socionext UniPhier PCIe controllers"
> diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
> index cbe95f0ea0ca..81810e644b23 100644
> --- a/drivers/pci/controller/dwc/pcie-tegra194.c
> +++ b/drivers/pci/controller/dwc/pcie-tegra194.c
> @@ -14,6 +14,8 @@
>  #include <linux/interrupt.h>
>  #include <linux/iopoll.h>
>  #include <linux/kernel.h>
> +#include <linux/kfifo.h>
> +#include <linux/kthread.h>

After moving to threaded IRQs, do you still need these includes?

Acked-by: Thierry Reding <treding@...dia.com>

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