linux-kernel - Re: [PATCH] dmaengine: ti: k3-udma: Fix teardown timeout for cyclic mode

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Message-ID: <20240312181325.GA4602@francesco-nb>
Date: Tue, 12 Mar 2024 19:13:25 +0100
From: Francesco Dolcini <francesco@...cini.it>
To: Vignesh Raghavendra <vigneshr@...com>
Cc: Peter Ujfalusi <peter.ujfalusi@...il.com>,
	Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	j-luthra@...com, j-choudhary@...com, francesco@...cini.it
Subject: Re: [PATCH] dmaengine: ti: k3-udma: Fix teardown timeout for cyclic
 mode

Hello Vignesh,

On Mon, Aug 21, 2023 at 04:10:03PM +0530, Vignesh Raghavendra wrote:
> In cyclic mode, last descriptor needs to have EOP flag set so that
> teardown flushes data towards PDMA in case of MEM_TO_DMA.  Else,
> operation will not complete successfully leading to spurious timeout on
> channel terminate.
> 
> Without this terminating aplay cmd outputs false error msg like:
> [116.402800] ti-bcdma 485c0100.dma-controller: chan1 teardown timeout!
> 
> This doesn't seem to be problem with UDMA-P on J7xx devices (although is
> a requirement as per spec) but shows up easily on BCDMA + McASP. Fix
> this by setting the appropriate flag
> 
> Fixes: 017794739702 ("dmaengine: ti: k3-udma: Initial support for K3 BCDMA")
> Suggested-by: Peter Ujfalusi <peter.ujfalusi@...il.com>
> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>

Any update on this? Not sure what's the current status here.
How can I help?

Francesco