mtd: rawnand: stm32_fmc2: avoid to lock the CPU bus

Miquel Raynal miquel.raynal at
Thu Jan 9 11:15:10 PST 2020

On Mon, 2019-12-16 at 09:01:55 UTC, Christophe Kerello wrote:
> We are currently using nand_soft_waitrdy to poll the status of the NAND
> flash. FMC2 enables the wait feature bit (this feature is mandatory for
> the sequencer mode). By enabling this feature, we can't poll the status
> of the NAND flash, the read status command is stucked in FMC2 pipeline
> until R/B# signal is high, and locks the CPU bus.
> To avoid to lock the CPU bus, we poll FMC2 ISR register. This register
> reports the status of the R/B# signal.
> Fixes: 2cd457f328c1 ("mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver")
> Signed-off-by: Christophe Kerello <christophe.kerello at>

Applied to mtd/fixes, thanks.


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