JFFS2 errors on qspi with Arria10

Hi there,

Thanks for your answers!

I am sorry, i was unable to answer for some days.

These are the qspi timings i use:

https://github.com/enclustra-bsp/altera-linux/blob/master/arch/arm/boot/dts/socfpga_arria10_mercury_aa1.dts

Altering these timing values did not improve the performance!

for example: Kernel 4.3 does autodetection of read-delay to "2" - setting read delay to values of 2,3..6 on 4.15 doesn't change the behavior

I did some further research in the code and discovered that the driver in version 4.3 does not use 4 channel communication with the qspi, but 4.15 does!

So i patched the 4.15 driver to only use single channel qspi and this seem to work. This leads me to believe there might be a problem with the hardware.

--> so this also confirms why changing any devicetree values do not help the problem.

For Reference:

driver 4.3: https://github.com/enclustra-bsp/altera-linux/blob/v1.6/drivers/mtd/spi-nor/cadence-quadspi.c

driver 4.15: https://github.com/enclustra-bsp/altera-linux/blob/v1.8/drivers/mtd/spi-nor/cadence-quadspi.c