On Fri, May 07, 2021 at 10:51:17PM +0800, Liguang Zhang wrote: > After a kernel upgrade from 4.19 to 5.10, we found that tpm flow control > always causes TIMEOUT which caused by wrong CS polarity setting depend > on gpiolib. > if (spi->cs_gpiod) > /* polarity handled by gpiolib */ > - gpiod_set_value_cansleep(spi->cs_gpiod, activate); > + gpiod_set_value_cansleep(spi->cs_gpiod, !enable); Whatever is going on here it doesn't seem likely that this is a problem in the SPI core given the widespread use of gpiod based chip selects - can you provide more explanation of what you're seeing here, how is the chip select configured, what is the hardware expectation and what actually ends up happening?
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