From: Vinod Koul <vkoul@kernel.org>
To: Aidan MacDonald <aidanmacdonald.0x0@gmail.com>
Cc: paul@crapouillou.net, linux-mips@vger.kernel.org,
dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] dmaengine: jz4780: set DMA maximum segment size
Date: Wed, 20 Apr 2022 17:13:32 +0530 [thread overview]
Message-ID: <Yl/x5BNqlKjxYgif@matsya> (raw)
In-Reply-To: <20220411153618.49876-1-aidanmacdonald.0x0@gmail.com>
On 11-04-22, 16:36, Aidan MacDonald wrote:
> Set the maximum segment size, since the hardware can do transfers larger
> than the default 64 KiB returned by dma_get_max_seg_size().
>
> The maximum segment size is limited by the 24-bit transfer count field
> in DMA descriptors. The number of bytes is equal to the transfer count
> times the transfer size unit, which is selected by the driver based on
> the DMA buffer address and length of the transfer. The size unit can be
> as small as 1 byte, so set the maximum segment size to 2^24-1 bytes to
> ensure the transfer count will not overflow regardless of the size unit
> selected by the driver.
Applied, thanks
--
~Vinod
prev parent reply other threads:[~2022-04-20 11:43 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-11 15:36 [PATCH] dmaengine: jz4780: set DMA maximum segment size Aidan MacDonald
2022-04-20 11:43 ` Vinod Koul [this message]
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