linux-kernel - Re: [PATCH v3] dma: imx-sdma: switch to dynamic context mode after script loaded

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Message-ID: <20150122091330.GT12209@pengutronix.de>
Date:	Thu, 22 Jan 2015 10:13:30 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Robin Gong <b38343@...escale.com>
Cc:	dan.j.williams@...el.com, vinod.koul@...el.com,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] dma: imx-sdma: switch to dynamic context mode after
 script loaded

On Thu, Jan 22, 2015 at 03:23:40PM +0800, Robin Gong wrote:
> Below comments got from Page4724 of Reference Manual of i.mx6q:
> http://cache.freescale.com/files/32bit/doc/ref_manual/IMX6DQRM.pdf
> 
> --"Static context mode should be used for the first channel called
> after reset to ensure that the all context RAM for that channel is
> initialized during the context SAVE phase when the channel is
> done or yields. Subsequent calls to the same channel or
> different channels may use any of the dynamic context modes.
> This will ensure that all context locations for the bootload
> channel are initialized, and prevent undefined values in context
> RAM from being loaded during the context restore if the
> channel is re-started later"
> 
> Unfortunately, the rule was broken by commit(5b28aa319bba96987316425a1131813d87cbab35)
> .This patch just take them back.
> 
> Signed-off-by: Robin Gong <b38343@...escale.com>

Acked-by: Sascha Hauer <s.hauer@...gutronix.de>

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