linux-kernel - Re: [PATCH v2 0/3] dmaengine: Add support for immediate commands

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Message-ID: <Y2UIS7P0alvqT4jn@matsya>
Date:   Fri, 4 Nov 2022 18:10:43 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Sireesh Kodali <sireeshkodali1@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH v2 0/3] dmaengine: Add support for immediate commands

On 27-10-22, 10:44, Sireesh Kodali wrote:
> The IPA v2.x block, found on some older Qualcomm SoCs, uses BAM DMA to
> send and receive packets from the AP. It also uses BAM to receive
> commands from the AP (and possibly the modem). These commands are
> encoded as "Immediate Commands". They vary from regular BAM DMA
> commands. Adding support for immediate commands is trivial, but requires
> also adding Immediate Commands to the dmaengine API, which is what this
> patch series does.

Can you explain a bit more. I understand you need "Immediate Commands"
but am really reluctant to add another interface to support a specific
use case

> 
> Sireesh Kodali (3):
>   doc: dmaengine: client-api: Add immediate commands in the DMA client
>     API
>   dmaengine: Add support for immediate commands in the client API
>   dmaengine: bam_dma: Add support for immediate commands
> 
>  Documentation/driver-api/dmaengine/provider.rst | 10 ++++++++++
>  drivers/dma/qcom/bam_dma.c                      |  3 +++
>  include/linux/dmaengine.h                       |  4 ++++
>  3 files changed, 17 insertions(+)
> 
> -- 
> 2.38.1

-- 
~Vinod