linux-kernel - Re: [PATCH v2 1/5] PCI:xilinx-nwl: Enable Root DMA

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Date:   Tue, 19 Sep 2017 14:36:35 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Ravi Shankar Jonnalagadda <venkata.ravi.jonnalagadda@...inx.com>
Cc:     vinod.koul@...el.com, robh+dt@...nel.org, mark.rutland@....com,
        michal.simek@...inx.com, soren.brinkmann@...inx.com,
        dan.j.williams@...el.com, bhelgaas@...gle.com, vjonnal@...inx.com,
        lorenzo.pieralisi@....com, bharat.kumar.gogada@...inx.com,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, rgummal@...inx.com
Subject: Re: [PATCH v2 1/5] PCI:xilinx-nwl: Enable Root DMA

Hi Ravi,

Please make the subject line follow the existing convention, i.e., run

  $ git log --oneline drivers/pci/host/pcie-xilinx-nwl.c

and make yours match spacing, capitalization, and style (imperative
sentence).

Also waiting for ack from Michal.

On Fri, Sep 08, 2017 at 05:53:03PM +0530, Ravi Shankar Jonnalagadda wrote:
> Enabling Root DMA interrupts
> 
> Adding Root DMA translations to bridge for Register Access
> 
> Signed-off-by: Ravi Shankar Jonnalagadda <vjonnal@...inx.com>
> Signed-off-by: RaviKiran Gummaluri <rgummal@...inx.com>
> ---
>  drivers/pci/host/pcie-xilinx-nwl.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 
> diff --git a/drivers/pci/host/pcie-xilinx-nwl.c b/drivers/pci/host/pcie-xilinx-nwl.c
> index eec641a..5766582 100644
> --- a/drivers/pci/host/pcie-xilinx-nwl.c
> +++ b/drivers/pci/host/pcie-xilinx-nwl.c
> @@ -39,6 +39,11 @@
>  #define E_ECAM_CONTROL			0x00000228
>  #define E_ECAM_BASE_LO			0x00000230
>  #define E_ECAM_BASE_HI			0x00000234
> +#define E_DREG_CTRL			0x00000288
> +#define E_DREG_BASE_LO			0x00000290
> +
> +#define DREG_DMA_EN			BIT(0)
> +#define DREG_DMA_BASE_LO		0xFD0F0000
>  
>  /* Ingress - address translations */
>  #define I_MSII_CAPABILITIES		0x00000300
> @@ -57,6 +62,10 @@
>  #define MSGF_MSI_STATUS_HI		0x00000444
>  #define MSGF_MSI_MASK_LO		0x00000448
>  #define MSGF_MSI_MASK_HI		0x0000044C
> +/* Root DMA Interrupt register */
> +#define MSGF_DMA_MASK			0x00000464
> +
> +#define MSGF_INTR_EN			BIT(0)
>  
>  /* Msg filter mask bits */
>  #define CFG_ENABLE_PM_MSG_FWD		BIT(1)
> @@ -766,6 +775,12 @@ static int nwl_pcie_bridge_init(struct nwl_pcie *pcie)
>  	nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, MSGF_LEG_STATUS) &
>  			  MSGF_LEG_SR_MASKALL, MSGF_LEG_STATUS);
>  
> +	/* Enabling DREG translations */
> +	nwl_bridge_writel(pcie, DREG_DMA_EN, E_DREG_CTRL);
> +	nwl_bridge_writel(pcie, DREG_DMA_BASE_LO, E_DREG_BASE_LO);
> +	/* Enabling Root DMA interrupts */
> +	nwl_bridge_writel(pcie, MSGF_INTR_EN, MSGF_DMA_MASK);
> +
>  	/* Enable all legacy interrupts */
>  	nwl_bridge_writel(pcie, MSGF_LEG_SR_MASKALL, MSGF_LEG_MASK);
>  
> -- 
> 2.7.4
>