From: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
To: Stephen Boyd <swboyd@chromium.org>, <agross@kernel.org>,
<andersson@kernel.org>, <broonie@kernel.org>,
<devicetree@vger.kernel.org>, <konrad.dybcio@linaro.org>,
<krzysztof.kozlowski+dt@linaro.org>,
<linux-arm-msm@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-spi@vger.kernel.org>, <robh+dt@kernel.org>,
<vkoul@kernel.org>
Cc: <quic_msavaliy@quicinc.com>, <dianders@chromium.org>,
<mka@chromium.org>, <quic_vtanuku@quicinc.com>
Subject: Re: [PATCH 0/2] spi: Add DMA mode support to spi-qcom-qspi
Date: Wed, 12 Apr 2023 20:58:32 +0530 [thread overview]
Message-ID: <c2c802e0-73fb-a362-7e46-f6a7ec40d6b1@quicinc.com> (raw)
In-Reply-To: <CAE-0n52U7yG=5DzYiHCH=JR4LvdczvhpuaU3RXqX6K9VwfvEgw@mail.gmail.com>
Thank you for the review...
On 4/5/2023 2:00 AM, Stephen Boyd wrote:
> Quoting Vijaya Krishna Nivarthi (2023-04-04 11:03:18)
>> There are large number of QSPI irqs that fire during boot/init and later
>> on every suspend/resume.
>> This could be made faster by doing DMA instead of PIO.
>> Below is comparison for number of interrupts raised in 2 acenarios...
>> Boot up and stabilise
>> Suspend/Resume
>>
>> Sequence PIO DMA
>> =======================
>> Boot-up 69088 19284
>> S/R 5066 3430
>>
> The interrupts are less, yes, but does it save time or power?
We have not made measurements but the change is expected to improve
performance.
Testing revealed no regressions.
prev parent reply other threads:[~2023-04-12 15:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-04 18:03 [PATCH 0/2] spi: Add DMA mode support to spi-qcom-qspi Vijaya Krishna Nivarthi
2023-04-04 18:03 ` [PATCH 1/2] arm64: dts: qcom: sc7280: Add stream-id of qspi to iommus Vijaya Krishna Nivarthi
2023-04-04 18:19 ` Krzysztof Kozlowski
2023-04-12 15:28 ` Vijaya Krishna Nivarthi
2023-04-04 18:03 ` [PATCH 2/2] spi: spi-qcom-qspi: Add DMA mode support Vijaya Krishna Nivarthi
2023-04-04 18:17 ` Mark Brown
2023-04-06 14:53 ` Vijaya Krishna Nivarthi
2023-04-06 15:28 ` Mark Brown
2023-04-12 15:29 ` Vijaya Krishna Nivarthi
2023-04-12 16:12 ` Mark Brown
2023-04-12 17:27 ` Vijaya Krishna Nivarthi
2023-04-04 20:45 ` Stephen Boyd
2023-04-12 15:28 ` Vijaya Krishna Nivarthi
2023-04-04 22:05 ` kernel test robot
2023-04-04 20:30 ` [PATCH 0/2] spi: Add DMA mode support to spi-qcom-qspi Stephen Boyd
2023-04-12 15:28 ` Vijaya Krishna Nivarthi [this message]
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