linux-kernel - Re: [PATCH 1/1] dmaengine: xilinx: xdma: Fix regmap's max

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Message-ID: <bee82ccd-9cd6-295f-839d-b17228212bc4@amd.com>
Date: Wed, 24 Sep 2025 09:47:45 -0700
From: Lizhi Hou <lizhi.hou@....com>
To: Alexander Stein <alexander.stein@...tq-group.com>, Brian Xu
	<brian.xu@....com>, Raj Kumar Rampelli <raj.kumar.rampelli@....com>, "Vinod
 Koul" <vkoul@...nel.org>, Michal Simek <michal.simek@....com>, Sonal Santan
	<sonal.santan@....com>, Max Zhen <max.zhen@....com>
CC: <dmaengine@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] dmaengine: xilinx: xdma: Fix regmap's max_register

There is a patch for this.

https://lore.kernel.org/dmaengine/20250903-xdma-max-reg-v4-1-894721175025@amarulasolutions.com/


Thanks,
Lizhi
On 9/24/25 05:59, Alexander Stein wrote:
> max_register specifies the last valid register address. As the BAR is only
> 64kiB in size, 65536 aka 0x10000 is too big. Restrict the XDMA register
> space to be actually 64kiB.
>
> Fixes: 17ce252266c7 ("dmaengine: xilinx: xdma: Add xilinx xdma driver")
> Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
> ---
>   drivers/dma/xilinx/xdma-regs.h | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/dma/xilinx/xdma-regs.h b/drivers/dma/xilinx/xdma-regs.h
> index 6ad08878e9386..c6ef198ef7627 100644
> --- a/drivers/dma/xilinx/xdma-regs.h
> +++ b/drivers/dma/xilinx/xdma-regs.h
> @@ -8,7 +8,7 @@
>   #define __DMA_XDMA_REGS_H
>   
>   /* The length of register space exposed to host */
> -#define XDMA_REG_SPACE_LEN	65536
> +#define XDMA_REG_SPACE_LEN	0xffff
>   
>   /*
>    * maximum number of DMA channels for each direction: