linux-kernel - Re: [PATCH] dmaengine: stm32-mdma: check the channel availability (secure or not)

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Message-ID: <YlQs/rPFnRWP6W6D@matsya>
Date:   Mon, 11 Apr 2022 18:58:30 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Amelie Delaunay <amelie.delaunay@...s.st.com>
Cc:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        dmaengine@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dmaengine: stm32-mdma: check the channel availability
 (secure or not)

On 30-03-22, 12:36, Amelie Delaunay wrote:
> STM32_MDMA_CCR bit[8] is used to enable Secure Mode (SM). If this bit is
> set, it means that all the channel registers are write-protected. So the
> channel is not available for Linux use.
> 
> Add stm32_mdma_filter_fn() callback filter and give it to
> __dma_request_chan (instead of dma_get_any_slave_channel()), to exclude the
> channel if it is marked Secure.

Applied, thanks

-- 
~Vinod