Re: [PATCH v2 3/3] mtd: rawnand: Support for sequential cache reads

Måns Rullgård
2023-07-17T13:12:34Z

Miquel Raynal <miquel.raynal@bootlin.com> writes:

> So, I should have done that earlier but, could you please slow the
> whole operation down, just to see if there is something wrong with the
> timings or if we should look in another direction.
>
> Maybe you could add a boolean to flag if the last CMD was a
> READCACHESEQ, READCACHESTART or READCACHEEND, and if the flag is
> true, please get the jiffies before and after each waitrdy and
> delay_ns. Finally, please print the expected delay and the actual one
> and compare to see if something was too fast compared to what we
> expected.

Between which points exactly should the delay be measured? Also, there
is no command called READCACHESTART. Did you mean READSTART or
something else?

> In a second test, you could simply add a udelay(50); at the end of
> omap_nand_exec_instr().

That didn't help.

--
Måns Rullgård