Re: [PATCH v2] mtd: rawnand: denali: add more delays before latching incoming data

[Ralph Siemsen]

On Mon, Jul 05, 2021 at 01:00:43AM +0900, Masahiro Yamada wrote:
> I no longer have any hardware to test this driver.
>
> If you increase data_setup_on_host (the current value is 10000),
> will it solve your issue?

Yes, it does seem to work with this value increased to 10001.

Looking more closely, I compared timing parameters in struct 
denali_chip_sel, for the kernel 5.4 (which works), for 5.10 (which 
fails), and also for 5.10 with data_setup_host=10001 (which works).

                5.4     5.10    5.10+10001
acc_clks        2       3       4
rdwr_en_lo_cnt  3       2       3
cs_setup_cnt    1       0       0

So it seems that on my hardware, rdwr_en_lo_cnt must be >= 3.

Regards,
Ralph