Re: [PATCH 05/13] PCI: dwc: Ensure all outbound ATU windows are reset

[Jingoo Han <jingoohan1@gmail.com>]

On 10/28/20, 4:47 PM, Rob Herring wrote:
> 
> The Layerscape driver clears the ATU registers which may have been
> configured by the bootloader. Any driver could have the same issue
> and doing it for all drivers doesn't hurt, so let's move it into the
> common DWC code.
>
> Cc: Minghuan Lian <minghuan.Lian@nxp.com>
> Cc: Mingkai Hu <mingkai.hu@nxp.com>
> Cc: Roy Zang <roy.zang@nxp.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Jingoo Han <jingoohan1@gmail.com>

Acked-by: Jingoo Han <jingoohan1@gmail.com>

Best regards,
Jingoo Han

> Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> Cc: linuxppc-dev@lists.ozlabs.org
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
>  drivers/pci/controller/dwc/pci-layerscape.c       | 14 --------------
>  drivers/pci/controller/dwc/pcie-designware-host.c |  5 +++++
>  2 files changed, 5 insertions(+), 14 deletions(-)
>
>  diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
>  index f24f79a70d9a..53e56d54c482 100644
>  --- a/drivers/pci/controller/dwc/pci-layerscape.c
>  +++ b/drivers/pci/controller/dwc/pci-layerscape.c
>  @@ -83,14 +83,6 @@ static void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie)
>   	iowrite32(val, pci->dbi_base + PCIE_STRFMR1);
>   }
>  
>  -static void ls_pcie_disable_outbound_atus(struct ls_pcie *pcie)
>  -{
>  -	int i;
>  -
>  -	for (i = 0; i < PCIE_IATU_NUM; i++)
>  -		dw_pcie_disable_atu(pcie->pci, i, DW_PCIE_REGION_OUTBOUND);
>  -}
>  -
>   static int ls1021_pcie_link_up(struct dw_pcie *pci)
>   {
>   	u32 state;
>  @@ -136,12 +128,6 @@ static int ls_pcie_host_init(struct pcie_port *pp)
>   	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>   	struct ls_pcie *pcie = to_ls_pcie(pci);
>  
>  -	/*
>  -	 * Disable outbound windows configured by the bootloader to avoid
>  -	 * one transaction hitting multiple outbound windows.
>  -	 * dw_pcie_setup_rc() will reconfigure the outbound windows.
>  -	 */
>  -	ls_pcie_disable_outbound_atus(pcie);
>   	ls_pcie_fix_error_response(pcie);
>  
>   	dw_pcie_dbi_ro_wr_en(pci);
>  diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
>  index cde45b2076ee..265a48f1a0ae 100644
>  --- a/drivers/pci/controller/dwc/pcie-designware-host.c
>  +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
>  @@ -534,6 +534,7 @@ static struct pci_ops dw_pcie_ops = {
>  
>   void dw_pcie_setup_rc(struct pcie_port *pp)
>   {
>  +	int i;
>   	u32 val, ctrl, num_ctrls;
>   	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  
>  @@ -583,6 +584,10 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
>   		PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
>   	dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
>  
>  +	/* Ensure all outbound windows are disabled so there are multiple matches */
>  +	for (i = 0; i < pci->num_viewport; i++)
>  +		dw_pcie_disable_atu(pci, i, DW_PCIE_REGION_OUTBOUND);
>  +
>   	/*
>   	 * If the platform provides its own child bus config accesses, it means
>   	 * the platform uses its own address translation component rather than
>  -- 
>  2.25.1