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Subject[V2 0/3] spi: Add DMA mode support to spi-qcom-qspi
Date
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 binding for qspi
arm64: dts: qcom: sc7280: Add stream-id of qspi to iommus
spi: spi-qcom-qspi: Add DMA mode support
---
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(-)

--
Qualcomm INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by the Linux Foundation.

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