linux-kernel - Re: [PATCH v2] PCI: designware: move remaining rc setup code to dw_pcie_setup

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Message-ID: <20160405231219.GG15353@localhost>
Date:	Tue, 5 Apr 2016 18:12:19 -0500
From:	Bjorn Helgaas <helgaas@...nel.org>
To:	Jisheng Zhang <jszhang@...vell.com>
Cc:	jingoohan1@...il.com, pratyush.anand@...il.com,
	bhelgaas@...gle.com, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] PCI: designware: move remaining rc setup code to
 dw_pcie_setup_rc()

On Wed, Mar 16, 2016 at 07:40:33PM +0800, Jisheng Zhang wrote:
> dw_pcie_setup_rc(), as its name indicates, setups the RC. But current
> dw_pcie_host_init() also contains some necessary rc setup code.
> 
> Another reason: the host may lost power during suspend to ram, the RC
> need to be re-setup after resume. The rc can't be correctly resumed
> without the rc setup code in dw_pcie_host_init().
> 
> So this patch moves the code to dw_pcie_setup_rc() to address the above
> two issues. After this patch, each pcie designware driver users could
> call dw_pcie_setup_rc() to re-setup rc when resume back.
> 
> Signed-off-by: Jisheng Zhang <jszhang@...vell.com>

Very nice, applied with Pratyush's ack to pci/host-designware for
v4.7, thanks!

> ---
> Since v1:
>  - fix gcc warning found by lkp, thanks
> 
>  drivers/pci/host/pcie-designware.c | 39 +++++++++++++++++++-------------------
>  1 file changed, 19 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index a4cccd3..261e4a11 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -434,7 +434,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
>  	struct platform_device *pdev = to_platform_device(pp->dev);
>  	struct pci_bus *bus, *child;
>  	struct resource *cfg_res;
> -	u32 val;
>  	int i, ret;
>  	LIST_HEAD(res);
>  	struct resource_entry *win;
> @@ -544,25 +543,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
>  	if (pp->ops->host_init)
>  		pp->ops->host_init(pp);
>  
> -	/*
> -	 * If the platform provides ->rd_other_conf, it means the platform
> -	 * uses its own address translation component rather than ATU, so
> -	 * we should not program the ATU here.
> -	 */
> -	if (!pp->ops->rd_other_conf)
> -		dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
> -					  PCIE_ATU_TYPE_MEM, pp->mem_base,
> -					  pp->mem_bus_addr, pp->mem_size);
> -
> -	dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
> -
> -	/* program correct class for RC */
> -	dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
> -
> -	dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
> -	val |= PORT_LOGIC_SPEED_CHANGE;
> -	dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
> -
>  	pp->root_bus_nr = pp->busn->start;
>  	if (IS_ENABLED(CONFIG_PCI_MSI)) {
>  		bus = pci_scan_root_bus_msi(pp->dev, pp->root_bus_nr,
> @@ -800,6 +780,25 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
>  	val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
>  		PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
>  	dw_pcie_writel_rc(pp, val, PCI_COMMAND);
> +
> +	/*
> +	 * If the platform provides ->rd_other_conf, it means the platform
> +	 * uses its own address translation component rather than ATU, so
> +	 * we should not program the ATU here.
> +	 */
> +	if (!pp->ops->rd_other_conf)
> +		dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
> +					  PCIE_ATU_TYPE_MEM, pp->mem_base,
> +					  pp->mem_bus_addr, pp->mem_size);
> +
> +	dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
> +
> +	/* program correct class for RC */
> +	dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
> +
> +	dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
> +	val |= PORT_LOGIC_SPEED_CHANGE;
> +	dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
>  }
>  
>  MODULE_AUTHOR("Jingoo Han <jg1.han@...sung.com>");
> -- 
> 2.7.0
> 
> --
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