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spi: cadence-xspi: support 4bytes sdma-io-width

Jisheng Zhang linux-devicetree linux-spi lkml 1 version In review

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  1. v1 Latest2 patches 11 repliesIn review

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#Subject and filesSizeRepliesApplied
1/2spi: dt-bindings: cdns,xspi: add sdma-io-widthDocumentation/devicetree/bindings/spi/cdns,xspi.yaml+6 -011 replies
2/2spi: cadence-xspi: support 4bytes sdma-io-widthdrivers/spi/spi-cadence-xspi.c+39 -40 replies

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Cover letter [PATCH 0/2] spi: cadence-xspi: support 4bytes sdma-io-width

The cdns xspi controller SDMA data port may support wider I/O width. Wider I/O width can benefit performance. A simple test with QSPI nor flash on one arm64 platform:

1 byte io width (default):

 # dd if=/dev/mtdblock0 of=/dev/null bs=8192 count=1000
 1000+0 records in
 1000+0 records out
 8192000 bytes (7.8MB) copied, 1.368735 seconds, 5.7MB/s

4 bytes io width:

 # dd if=/dev/mtdblock0 of=/dev/null bs=8192 count=1000
 1000+0 records in
 1000+0 records out
 8192000 bytes (7.8MB) copied, 1.088787 seconds, 7.2MB/s

Improved by 26.3%!

Jisheng Zhang (2):
spi: dt-bindings: cdns,xspi: add sdma-io-width
spi: cadence-xspi: support 4bytes sdma-io-width

 .../devicetree/bindings/spi/cdns,xspi.yaml    |  6 +++
 drivers/spi/spi-cadence-xspi.c                | 43 +++++++++++++++++--
 2 files changed, 45 insertions(+), 4 deletions(-)
Signature · 1 line
2.53.0

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