linux-kernel - [PATCH 0/7] dmaengine: pl330: Updates and new quirks for peripheral usecases

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Date:   Thu,  4 May 2023 14:57:30 +0000
From:   Joy Chakraborty <joychakr@...gle.com>
To:     Vinod Koul <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, manugautam@...gle.com,
        danielmentz@...gle.com, sjadavani@...gle.com,
        Joy Chakraborty <joychakr@...gle.com>
Subject: [PATCH 0/7] dmaengine: pl330: Updates and new quirks for peripheral usecases

This patch series makes some initial minor and cosmetic changes:
    -Add variables and logic to handle separate source and destination
    AxSize and AxLen.
    -Use __ffs to calculate AxSize for consistency in the driver
    -Use switch-case in prep_slave_sg() for consistency
    -Change args get_burst_len() to remove redundant "len" and add
    burst_size so that it can be used in multiple places.

to majorly enable addition of 2 quirks in the last 2 patches:
    -Addition of a quirk to allow transactions towards memory to use the
    maximum possible bus width (AxSize) during a memory to peripheral
    dma usage or vise-versa.
    -Addition of a quirk which makes PL330 copy left over data after
    executing bursts to the peripheral in singles instead of bursts.
    -Update dt-bindings to represent the quirks
Quirks are explained further in the commit text.
---

Joy Chakraborty (7):
  dmaengine: pl330: Separate SRC and DST burst size and len
  dmaengine: pl330: Use FFS to calculate burst size
  dmaengine: pl330: Change if-else to switch-case for consistency
  dmaengine: pl330: Change unused arg "len" from get_burst_len()
  dmaengine: pl330: Quirk to optimize AxSize for peripheral usecases
  dmaengine: pl330: Quirk to use DMA singles for peripheral _dregs
  dt-bindings: dmaengine: pl330: Add new quirks

 .../devicetree/bindings/dma/arm,pl330.yaml    |   8 +
 drivers/dma/pl330.c                           | 245 +++++++++++++++---
 2 files changed, 213 insertions(+), 40 deletions(-)

-- 
2.40.1.495.gc816e09b53d-goog