Mark Brown b30f7c8eb0 spi: mux: Fix mux interaction with fast path optimisations ... The spi-mux driver is rather too clever and attempts to resubmit any message that is submitted to it to the parent controller with some adjusted callbacks. This does not play at all nicely with the fast path which now sets flags on the message indicating that it's being handled through the fast path, we see async messages flagged as being on the fast path. Ideally the spi-mux code would duplicate the message but that's rather invasive and a bit fragile in that it relies on the mux knowing which fields in the message to copy. Instead teach the core that there are controllers which can't cope with the fast path and have the mux flag itself as being such a controller, ensuring that messages going via the mux don't get partially handled via the fast path. This will reduce the performance of any spi-mux connected device since we'll now always use the thread for both the actual controller and the mux controller instead of just the actual controller but given that we were always hitting the slow path anyway it's hopefully not too much of an additional cost and it allows us to keep the fast path. Fixes: ae7d2346dc ("spi: Don't use the message queue if possible in spi_sync") Reported-by: Casper Andersson <casper.casan@gmail.com> Tested-by: Casper Andersson <casper.casan@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20220901120732.49245-1-broonie@kernel.org Signed-off-by: Mark Brown <broonie@kernel.org>		2022-09-02 13:27:13 +01:00
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ad7877.h
ads7846.h
altera.h
at73c213.h
at86rf230.h
cc2520.h
corgi_lcd.h
ds1305.h
eeprom.h
flash.h
libertas_spi.h
max7301.h
mc33880.h
mmc_spi.h
mxs-spi.h
pxa2xx_spi.h	spi: pxa2xx_spi: Convert to use GPIO descriptors	2022-01-31 15:17:27 +00:00
rspi.h
s3c24xx-fiq.h
s3c24xx.h	spi: s3c24xx: Convert to GPIO descriptors	2022-01-24 13:37:34 +00:00
sh_hspi.h
sh_msiof.h
spi-fsl-dspi.h
spi-mem.h	spi: spi-mem: Add an ecc parameter to the spi_mem_op structure	2022-02-10 09:32:30 +01:00
spi.h	spi: mux: Fix mux interaction with fast path optimisations	2022-09-02 13:27:13 +01:00
spi_bitbang.h
spi_gpio.h
spi_oc_tiny.h
tdo24m.h
tle62x0.h
xilinx_spi.h