Re: [PATCH v2 08/11] spi: cadence-qspi: add early busywait to cqspi_wait_for_bit()

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, Apr 05, 2024 at 05:02:18PM +0200, Théo Lebrun wrote:

> If the CQSPI_BUSYWAIT_EARLY quirk flag is on, call
> readl_relaxed_poll_timeout() with no sleep at the start of
> cqspi_wait_for_bit(). If its short timeout expires, a sleeping
> readl_relaxed_poll_timeout() call takes the relay.
> 
> Behavior is hidden behind a quirk flag to keep the previous behavior the
> same on all platforms.
> 
> The reason is to avoid hrtimer interrupts on the system. All read
> operations take less than 100µs.

Why would this be platform specific, this seems like a very standard
optimisation technique?

Attachment: signature.asc
Description: PGP signature


[Index of Archives]     [LKML Archive]     [Linux ARM Kernel]     [Linux ARM]     [Git]     [Yosemite News]     [Linux SCSI]     [Linux Hams]

  Powered by Linux