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From: Jon Hunter <jonathanh@nvidia.com>
To: Sameer Pujar <spujar@nvidia.com>, <vkoul@kernel.org>,
	<dan.j.williams@intel.com>
Cc: <thierry.reding@gmail.com>, <ldewangan@nvidia.com>,
	<dmaengine@vger.kernel.org>, <linux-tegra@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] dmaengine: tegra210-adma: fix transfer failure
Date: Thu, 20 Jun 2019 17:43:04 +0100	[thread overview]
Message-ID: <bf478236-9aa7-68cc-4a56-296db2fc4379@nvidia.com> (raw)
In-Reply-To: <1561047348-14413-1-git-send-email-spujar@nvidia.com>


On 20/06/2019 17:15, Sameer Pujar wrote:
> From Tegra186 onwards OUTSTANDING_REQUESTS field is added in channel
> configuration register (bits 7:4). ADMA allows a maximum of 8 reads
> to source and that many writes to target memory be outstanding at any
> given point of time. If this field is not programmed, DMA transfers
> fail to happen.

BTW, I am not sure I follow the above. You say a max of 8 reads to the
source, however, the field we are programming can have a value of up to
15. So does that mean this field should only be programmed with a max of 8?

Thanks
Jon

-- 
nvpublic

  parent reply	other threads:[~2019-06-20 16:43 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-20 16:15 Sameer Pujar
2019-06-20 16:37 ` Jon Hunter
2019-06-21  2:50   ` Sameer Pujar
2019-06-20 16:43 ` Jon Hunter [this message]
2019-06-21  3:06   ` Sameer Pujar

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