linux-kernel - Re: [PATCH 1/4] PCI:xilinx-nwl: Enable Root DMA

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Date:   Sat, 19 Aug 2017 16:15:48 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Ravi Shankar Jonnalagadda <venkata.ravi.jonnalagadda@...inx.com>
Cc:     bhelgaas@...gle.com, michal.simek@...inx.com,
        soren.brinkmann@...inx.com, lorenzo.pieralisi@....com,
        bharat.kumar.gogada@...inx.com, vjonnal@...inx.com,
        paul.gortmaker@...driver.com, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dan.j.williams@...el.com, vinod.koul@...el.com,
        dmaengine@...r.kernel.org
Subject: Re: [PATCH 1/4] PCI:xilinx-nwl: Enable Root DMA

On Tue, Aug 08, 2017 at 04:42:16PM +0530, Ravi Shankar Jonnalagadda wrote:

Please update the subject line to match previous changes to this file,
e.g. (note spacing),

  PCI: xilinx-nwl: Enable Root DMA

> Enabling Root DMA interrupts

s/Enabling/Enable/  (also in code comments)

> Adding Root DMA translations to bridge for Register Access

s/Adding/Add/

> Signed-off-by: Ravi Shankar Jonnalagadda <vjonnal@...inx.com>

This should have an ack from Michal, but as far as I'm concerned:

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

Since the bulk of this series is in drivers/dma, I assume Dan or Vinod
will take care of it.

> ---
>  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);
>  
> -- 
> 2.1.1
>