Re: [PATCH v2] PCI: dwc: Move iATU detection earlier

[Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>]

On Tue, Apr 13, 2021 at 05:22:19PM +0300, Dmitry Baryshkov wrote:
> From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> 
> dw_pcie_ep_init() depends on the detected iATU region numbers to allocate
> the in/outbound window management bitmap.  It fails after 281f1f99cf3a
> ("PCI: dwc: Detect number of iATU windows").
> 
> Move the iATU region detection into a new function, move the detection to
> the very beginning of dw_pcie_host_init() and dw_pcie_ep_init().  Also
> remove it from the dw_pcie_setup(), since it's more like a software
> initialization step than hardware setup.
> 
> Fixes: 281f1f99cf3a ("PCI: dwc: Detect number of iATU windows")
> Link: https://lore.kernel.org/r/20210125044803.4310-1-Zhiqiang.Hou@nxp.com
> Tested-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
> Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> Reviewed-by: Rob Herring <robh@kernel.org>
> Cc: stable@vger.kernel.org	# v5.11+
> [DB: moved dw_pcie_iatu_detect to happen after host_init callback]
> Link: https://lore.kernel.org/linux-pci/20210407131255.702054-1-dmitry.baryshkov@linaro.org
> Cc: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>

Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>

Thanks,
Mani

> ---
>  drivers/pci/controller/dwc/pcie-designware-ep.c   |  2 ++
>  drivers/pci/controller/dwc/pcie-designware-host.c |  1 +
>  drivers/pci/controller/dwc/pcie-designware.c      | 11 ++++++++---
>  drivers/pci/controller/dwc/pcie-designware.h      |  1 +
>  4 files changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
> index 1c25d8337151..8d028a88b375 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-ep.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
> @@ -705,6 +705,8 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
>  		}
>  	}
>  
> +	dw_pcie_iatu_detect(pci);
> +
>  	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space");
>  	if (!res)
>  		return -EINVAL;
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 7e55b2b66182..24192b40e3a2 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -398,6 +398,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
>  		if (ret)
>  			goto err_free_msi;
>  	}
> +	dw_pcie_iatu_detect(pci);
>  
>  	dw_pcie_setup_rc(pp);
>  	dw_pcie_msi_init(pp);
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 004cb860e266..a945f0c0e73d 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -660,11 +660,9 @@ static void dw_pcie_iatu_detect_regions(struct dw_pcie *pci)
>  	pci->num_ob_windows = ob;
>  }
>  
> -void dw_pcie_setup(struct dw_pcie *pci)
> +void dw_pcie_iatu_detect(struct dw_pcie *pci)
>  {
> -	u32 val;
>  	struct device *dev = pci->dev;
> -	struct device_node *np = dev->of_node;
>  	struct platform_device *pdev = to_platform_device(dev);
>  
>  	if (pci->version >= 0x480A || (!pci->version &&
> @@ -693,6 +691,13 @@ void dw_pcie_setup(struct dw_pcie *pci)
>  
>  	dev_info(pci->dev, "Detected iATU regions: %u outbound, %u inbound",
>  		 pci->num_ob_windows, pci->num_ib_windows);
> +}
> +
> +void dw_pcie_setup(struct dw_pcie *pci)
> +{
> +	u32 val;
> +	struct device *dev = pci->dev;
> +	struct device_node *np = dev->of_node;
>  
>  	if (pci->link_gen > 0)
>  		dw_pcie_link_set_max_speed(pci, pci->link_gen);
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 7247c8b01f04..7d6e9b7576be 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -306,6 +306,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
>  void dw_pcie_disable_atu(struct dw_pcie *pci, int index,
>  			 enum dw_pcie_region_type type);
>  void dw_pcie_setup(struct dw_pcie *pci);
> +void dw_pcie_iatu_detect(struct dw_pcie *pci);
>  
>  static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
>  {
> -- 
> 2.30.2
>