linux-kernel - [PATCH v3 0/3] spi: Add DMA mode support to spi-qcom-qspi

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Date:   Fri, 14 Apr 2023 19:35:50 +0530
From:   Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>
To:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        broonie@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org,
        cros-qcom-dts-watchers@...omium.org, linux-arm-msm@...r.kernel.org,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     quic_msavaliy@...cinc.com, dianders@...omium.org, mka@...omium.org,
        swboyd@...omium.org, quic_vtanuku@...cinc.com,
        Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>
Subject: [PATCH v3 0/3] spi: Add DMA mode support to spi-qcom-qspi

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

Though we have not made measurements for speed, power we expect
the performance to be better with DMA mode and no regressions were
encountered in testing.

Vijaya Krishna Nivarthi (3):
  spi: dt-bindings: qcom,spi-qcom-qspi: Add iommus
  arm64: dts: qcom: sc7280: Add stream-id of qspi to iommus
  spi: spi-qcom-qspi: Add DMA mode support
---
v2 -> v3:
- Modified commit messages
- Made a change to driver based on re-review

v1 -> v2:
- Added documentation file to the series
- Made changes to driver based on HPG re-review
---
 .../bindings/spi/qcom,spi-qcom-qspi.yaml           |   3 +
 arch/arm64/boot/dts/qcom/sc7280.dtsi               |   1 +
 drivers/spi/spi-qcom-qspi.c                        | 434 +++++++++++++++++++--
 3 files changed, 407 insertions(+), 31 deletions(-)

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