linux-kernel - Re: [PATCH] dmaengine: xgene-dma: Fix the resource map to handle overlapping

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Date:	Fri, 10 Jul 2015 14:06:48 +0530
From:	Rameshwar Sahu <rsahu@....com>
To:	Vinod Koul <vinod.koul@...el.com>, dan.j.williams@...el.com
Cc:	dmaengine@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, jcm@...hat.com,
	patches@....com, Rameshwar Prasad Sahu <rsahu@....com>
Subject: Re: [PATCH] dmaengine: xgene-dma: Fix the resource map to handle overlapping

Hi Vinod,

On Tue, Jul 7, 2015 at 3:34 PM, Rameshwar Prasad Sahu <rsahu@....com> wrote:
> There is an overlap in dma ring cmd csr region due to sharing of ethernet
> ring cmd csr region. This patch fix the resource overlapping by mapping
> the entire dma ring cmd csr region.
>
> Signed-off-by: Rameshwar Prasad Sahu <rsahu@....com>
> ---
>  Documentation/devicetree/bindings/dma/apm-xgene-dma.txt | 2 +-
>  arch/arm64/boot/dts/apm/apm-storm.dtsi                  | 2 +-
>  drivers/dma/xgene-dma.c                                 | 3 +++
>  3 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/dma/apm-xgene-dma.txt b/Documentation/devicetree/bindings/dma/apm-xgene-dma.txt
> index d305876..c53e0b0 100644
> --- a/Documentation/devicetree/bindings/dma/apm-xgene-dma.txt
> +++ b/Documentation/devicetree/bindings/dma/apm-xgene-dma.txt
> @@ -35,7 +35,7 @@ Example:
>                         device_type = "dma";
>                         reg = <0x0 0x1f270000 0x0 0x10000>,
>                               <0x0 0x1f200000 0x0 0x10000>,
> -                             <0x0 0x1b008000 0x0 0x2000>,
> +                             <0x0 0x1b000000 0x0 0x400000>,
>                               <0x0 0x1054a000 0x0 0x100>;
>                         interrupts = <0x0 0x82 0x4>,
>                                      <0x0 0xb8 0x4>,
> diff --git a/arch/arm64/boot/dts/apm/apm-storm.dtsi b/arch/arm64/boot/dts/apm/apm-storm.dtsi
> index 0689c3f..58093ed 100644
> --- a/arch/arm64/boot/dts/apm/apm-storm.dtsi
> +++ b/arch/arm64/boot/dts/apm/apm-storm.dtsi
> @@ -823,7 +823,7 @@
>                         device_type = "dma";
>                         reg = <0x0 0x1f270000 0x0 0x10000>,
>                               <0x0 0x1f200000 0x0 0x10000>,
> -                             <0x0 0x1b008000 0x0 0x2000>,
> +                             <0x0 0x1b000000 0x0 0x400000>,
>                               <0x0 0x1054a000 0x0 0x100>;
>                         interrupts = <0x0 0x82 0x4>,
>                                      <0x0 0xb8 0x4>,
> diff --git a/drivers/dma/xgene-dma.c b/drivers/dma/xgene-dma.c
> index 620fd55ec..dff22ab 100644
> --- a/drivers/dma/xgene-dma.c
> +++ b/drivers/dma/xgene-dma.c
> @@ -111,6 +111,7 @@
>  #define XGENE_DMA_MEM_RAM_SHUTDOWN             0xD070
>  #define XGENE_DMA_BLK_MEM_RDY                  0xD074
>  #define XGENE_DMA_BLK_MEM_RDY_VAL              0xFFFFFFFF
> +#define XGENE_DMA_RING_CMD_SM_OFFSET           0x8000
>
>  /* X-Gene SoC EFUSE csr register and bit defination */
>  #define XGENE_SOC_JTAG1_SHADOW                 0x18
> @@ -1887,6 +1888,8 @@ static int xgene_dma_get_resources(struct platform_device *pdev,
>                 return -ENOMEM;
>         }
>
> +       pdma->csr_ring_cmd += XGENE_DMA_RING_CMD_SM_OFFSET;
> +
>         /* Get efuse csr region */
>         res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
>         if (!res) {
> --
> 1.8.2.1
>

Any comments on above patch ?
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