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SubjectRe: [PATCH 0/2] spi: Add DMA mode support to spi-qcom-qspi
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Thank you for the review...


On 4/5/2023 2:00 AM, Stephen Boyd wrote:
> Quoting Vijaya Krishna Nivarthi (2023-04-04 11:03:18)
>> 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
>>
> The interrupts are less, yes, but does it save time or power?

We have not made measurements but the change is expected to improve
performance.

Testing revealed no regressions.

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