spi: bcm2835: make the polling duration limits configurable

Browse source

Under some circumstances the default 30 us polling limit is not optimal
and may lead to long delays because we are waiting on an interrupt.
with this patch we have the possibility to influence this policy.

So make this limit (in us) configurable via a module parameters
(but also modifyable via /sys/modules/...)

This replicates similar code found in spi-bcm2835aux.

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>

Changelog:
  V1 -> V2: applied feedback by Stefan Wahren
            reorganized patchset
	    added extra rational, descriptions
Signed-off-by: Mark Brown <broonie@kernel.org>

...

This commit is contained in:

Martin Sperl 2019-04-23 20:15:11 +00:00 • committed by Mark Brown

parent c41d62b06c

commit ff245d90eb

No known key found for this signature in database

GPG key ID: 24D68B725D5487D0

1 changed files with 14 additions and 8 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

22

drivers/spi/spi-bcm2835.c

View file