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With STM32 QSPI, it is possible to poll the status register of the device. This could be done to offload the CPU during an operation (erase or program a SPI NAND for example). spi_mem_poll_status API has been added to handle this feature. This new function take care of the offload/non-offload cases. For the non-offload case, use read_poll_timeout() to poll the status in order to release CPU during this phase. For example, previously, when erasing large area, in non-offload case, CPU load can reach ~50%, now it decrease to ~35%. Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com> Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com> Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com> Link: https://lore.kernel.org/r/20210518162754.15940-2-patrice.chotard@foss.st.com Signed-off-by: Mark Brown <broonie@kernel.org> |
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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 | ||
rspi.h | ||
s3c24xx-fiq.h | ||
s3c24xx.h | ||
sh_hspi.h | ||
sh_msiof.h | ||
spi-fsl-dspi.h | ||
spi-mem.h | ||
spi.h | ||
spi_bitbang.h | ||
spi_gpio.h | ||
spi_oc_tiny.h | ||
tdo24m.h | ||
tle62x0.h | ||
xilinx_spi.h |