The 07/01/2019 12:04, Miquel Raynal wrote:
EXTERNAL MAIL
Hi Piotr,
Piotr Sroka <pio...@cadence.com> wrote on Mon, 1 Jul 2019 10:51:45
+0100:
[...]
>> >> >
>> >> >This driver is way too massive, I am pretty sure it can shrink a
>> >> >little bit more.
>> >> >[...]
>> >> >
>> >> I will try to make it shorer but it will be difucult to achive. It is
because - there are a lot of calculation needed for PHY - ECC are interleaved with
data (like on marvell-nand or gpmi-nand).
>> >> Therefore: + RAW mode is complicated + protecting BBM increases
number of lines of source code
>> >> - need to support two DMA engines internal and external (slave) We will
see on next patch version what is the result. That page layout looks:
>> >
>> >Maybe you don't need to support both internal and external DMA?
>> >
>> >I am pretty sure there are rooms for size reduction.
>>
>> I describe how it works in general and maybe you help me chose better
solution.
>>
>> HW controller can work in 3 modes. PIO - can work in master or slave DMA
>> CDMA - needs Master DMA for accessing command descriptors.
>> Generic mode - can use only Slave DMA.
>>
>> Generic mode is neccessery to implement functions other than page
>> program, page read, block erase. So it is essential. I cannot avoid
>> to use Slave DMA.
>
>This deserves a nice comment at the top.
Ok I will add the modes description to cover letter. >
Not only to the cover letter: People read the code. Interested people
might also read the commit log which is quite easy to find. The cover
letter however will just disappear in the history of the Internet. I
would rather prefer you explain how the IP works at the top of the
driver.
So I will add the modes description to both cover letter and
at the top of the driver.
Thanks,
Miquèl
Thanks,
Piotr
