linux-kernel - [PATCH v2 0/2] spi-geni-qcom: Add new interfaces and utilise them to do map/unmap in framework for SE DMA

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Date:   Wed, 17 May 2023 17:48:12 +0530
From:   Vijaya Krishna Nivarthi <quic_vnivarth@...cinc.com>
To:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        broonie@...nel.org, quic_vnivarth@...cinc.com,
        dianders@...omium.org, linux-arm-msm@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     quic_msavaliy@...cinc.com, mka@...omium.org, swboyd@...omium.org,
        quic_vtanuku@...cinc.com, quic_ptalari@...cinc.com
Subject: [PATCH v2 0/2] spi-geni-qcom: Add new interfaces and utilise them to do map/unmap in framework for SE DMA

A "known issue" during implementation of SE DMA for spi geni driver was
that it does DMA map/unmap internally instead of in spi framework.
Current patches remove this hiccup and also clean up code a bit.

Testing revealed no regressions and results with 1000 iterations of
reading from EC showed no loss of performance.
Results
=======
Before - Iteration 999, min=5.10, max=5.17, avg=5.14, ints=25129
After  - Iteration 999, min=5.10, max=5.20, avg=5.15, ints=25153

Vijaya Krishna Nivarthi (2):
  soc: qcom: geni-se: Add interfaces geni_se_tx_init_dma() and
    geni_se_rx_init_dma()
  spi: spi-geni-qcom: Do not do DMA map/unmap inside driver, use
    framework instead
---
v1 -> v2:
- Modified interfaces arguments and accordingly calls to them
- Added dma_max_len to driver

 drivers/soc/qcom/qcom-geni-se.c  |  67 ++++++++++++++++++-------
 drivers/spi/spi-geni-qcom.c      | 103 +++++++++++++++++++--------------------
 include/linux/soc/qcom/geni-se.h |   4 ++
 3 files changed, 103 insertions(+), 71 deletions(-)

-- 
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