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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_bitbang.h | ||
| spi_gpio.h | ||
| spi_oc_tiny.h | ||
| spi-fsl-dspi.h | ||
| spi-mem.h | ||
| spi.h | ||
| tdo24m.h | ||
| tle62x0.h | ||
| xilinx_spi.h | ||