linux-kernel - Re: [PATCH v2 02/16] dmaengine: qcom: bam_dma: add bam_pipe

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Message-ID: <9271efb2-db9a-4f45-bdb1-724ce6dbcbf1@kernel.org>
Date: Sat, 17 Aug 2024 11:08:49 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Md Sadre Alam <quic_mdalam@...cinc.com>, vkoul@...nel.org,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 andersson@...nel.org, konradybcio@...nel.org, thara.gopinath@...il.com,
 herbert@...dor.apana.org.au, davem@...emloft.net, gustavoars@...nel.org,
 u.kleine-koenig@...gutronix.de, kees@...nel.org, agross@...nel.org,
 linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-crypto@...r.kernel.org
Cc: quic_srichara@...cinc.com, quic_varada@...cinc.com,
 quic_utiwari@...cinc.com
Subject: Re: [PATCH v2 02/16] dmaengine: qcom: bam_dma: add bam_pipe_lock dt
 property

On 15/08/2024 10:57, Md Sadre Alam wrote:
> bam having locking and unlocking mechanism of bam pipes.
> Upon encountering a descriptor with Lock bit set, the
> BAM will lock all other pipes not related to the current
> pipe group, and keep handling the current pipe only until
> it sees the Un-Lock set , then it will release all locked
> pipes. The actual locking is done on the new descriptor
> fetching for publishing, i.e. locked pipe will not fetch
> new descriptors even if it got event/events adding more
> descriptors for this pipe.
> 
> Adding the bam_pipe_lock flag in bam driver to handle
> Lock and Un-Lock bit set on command descriptor.
> 
> Signed-off-by: Md Sadre Alam <quic_mdalam@...cinc.com>
> ---
> 
> Change in [v2]
> 
> * Added bam_pipe_lock dt property
> 
> Change in [v1]
> 
> * This patch was not included in [v1]
> 
>  drivers/dma/qcom/bam_dma.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
> index 5e7d332731e0..1ac7e250bdaa 100644
> --- a/drivers/dma/qcom/bam_dma.c
> +++ b/drivers/dma/qcom/bam_dma.c
> @@ -389,6 +389,7 @@ struct bam_device {
>  	u32 ee;
>  	bool controlled_remotely;
>  	bool powered_remotely;
> +	bool bam_pipe_lock;

There is no user of this property. It's just no-op. Split your code into
logical chunks, but logical chunk is not "I add field to structure which
is not used".


Best regards,
Krzysztof