linux-kernel - Re: [PATCH 1/2] Revert "ARM: dts: imx: use dual-fifo sdma script for ssi"

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Date:	Wed, 8 Jan 2014 10:03:26 -0200
From:	Fabio Estevam <festevam@...il.com>
To:	Nicolin Chen <Guangyu.Chen@...escale.com>
Cc:	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Sascha Hauer <kernel@...gutronix.de>,
	Shawn Guo <shawn.guo@...aro.org>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	dmaengine@...r.kernel.org,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/2] Revert "ARM: dts: imx: use dual-fifo sdma script for ssi"

On Wed, Jan 8, 2014 at 6:45 AM, Nicolin Chen <Guangyu.Chen@...escale.com> wrote:
> This reverts commit b1d27c79c8377df1880447375deffa3bb82c7bd3.
>
> Previously we switched the SSI scriprt to dual-fifo mode to reduce playback
> underrun issue, which is only included by SDMA firmware version 2. However,
> there are quite a lot people still using version 1 or default firmware in
> the ROM code of SoC while these two kinds of firmwares do not support the
> dual-fifo script and the audio function on their platform would be broken.
>
> Thus this patch provisionally reverts the dual-fifo script to the original
> single fifo script to meet all kinds of users' requirements, including the
> version 1/2 or inner ROM firmware.
>
> Reported-by: Fabio Estevam <fabio.estevam@...escale.com>
> Signed-off-by: Nicolin Chen <Guangyu.Chen@...escale.com>

Thanks, Nicolin.

This fixes audio playback without additional SDMA firmware:

Tested-by: Fabio Estevam <fabio.estevam@...escale.com>
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