linux-kernel - Re: [PATCH v8 1/2] dmaengine: qcom: gpi: Add GPI Block event interrupt support

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Message-ID: <44msykd4jtbhqjycvsrvfrhimqixntgmtv6ihvyivfhpabwexm@4fdiursyx6yb>
Date: Fri, 3 Oct 2025 20:48:24 +0200
From: Andi Shyti <andi.shyti@...nel.org>
To: Jyothi Kumar Seerapu <jyothi.seerapu@....qualcomm.com>
Cc: Vinod Koul <vkoul@...nel.org>, 
	Mukesh Kumar Savaliya <quic_msavaliy@...cinc.com>, Viken Dadhaniya <quic_vdadhani@...cinc.com>, 
	Sumit Semwal <sumit.semwal@...aro.org>, Christian König <christian.koenig@....com>, 
	linux-arm-msm@...r.kernel.org, dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-i2c@...r.kernel.org, linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	linaro-mm-sig@...ts.linaro.org, quic_vtanuku@...cinc.com
Subject: Re: [PATCH v8 1/2] dmaengine: qcom: gpi: Add GPI Block event
 interrupt support

Hi Vinod,

On Thu, Sep 25, 2025 at 05:30:34PM +0530, Jyothi Kumar Seerapu wrote:
> From: Jyothi Kumar Seerapu <quic_jseerapu@...cinc.com>
> 
> GSI hardware generates an interrupt for each transfer completion.
> For multiple messages within a single transfer, this results in
> N interrupts for N messages, leading to significant software
> interrupt latency.
> 
> To mitigate this latency, utilize Block Event Interrupt (BEI) mechanism.
> Enabling BEI instructs the GSI hardware to prevent interrupt generation
> and BEI is disabled when an interrupt is necessary.
> 
> Large I2C transfer can be divided into chunks of messages internally.
> Interrupts are not expected for the messages for which BEI bit set,
> only the last message triggers an interrupt, indicating the completion of
> N messages. This BEI mechanism enhances overall transfer efficiency.
> 
> Signed-off-by: Jyothi Kumar Seerapu <quic_jseerapu@...cinc.com>

Ping on this patch. I'm sorry, but going to take it in the next
few days if I don't hear from you, this patch has been waiting
for a very long time.

Thanks,
Andi