[PATCH 3/3] mtd: rawnand: marvell: add suspend and resume hooks

[daniel@xxxxxxxxxx (Daniel Mack)]

Hi,

On 07/06/2018 11:22 PM, Boris Brezillon wrote:
> On Fri,  6 Jul 2018 22:14:15 +0200
> Daniel Mack <daniel at zonque.org> wrote:
> 
>> This patch restores the suspend and resume hooks that the old driver used
>> to have. Apart from stopping and starting the clocks, the resume callback
>> also nullifies the selected_chip pointer, so the next command that is issued
>> will re-select the chip and thereby restore the timing registers.
>>
>> Without this patch, a PXA3xx based system would cough up an error similar to
>> the one below after resume.
>>
>> [   44.660162] marvell-nfc 43100000.nand-controller: Timeout waiting for  RB signal
>> [   44.671492] ubi0 error: ubi_io_write: error -110 while writing 2048 bytes to PEB 102:38912, written 0 bytes
>> [   44.682887] CPU: 0 PID: 1417 Comm: remote-control Not tainted 4.18.0-rc2+ #344
>> [   44.691197] Hardware name: Marvell PXA3xx (Device Tree Support)
>> [   44.697111] Backtrace:
>> [   44.699593] [<c0106458>] (dump_backtrace) from [<c0106718>] (show_stack+0x18/0x1c)
>> [   44.708931]  r7:00000800 r6:00009800 r5:00000066 r4:c6139000
>> [   44.715833] [<c0106700>] (show_stack) from [<c0678a60>] (dump_stack+0x20/0x28)
>> [   44.724206] [<c0678a40>] (dump_stack) from [<c0456cbc>] (ubi_io_write+0x3d4/0x630)
>> [   44.732925] [<c04568e8>] (ubi_io_write) from [<c0454428>] (ubi_eba_write_leb+0x690/0x6fc)
>> ...
>>
>> Signed-off-by: Daniel Mack <daniel at zonque.org>
> 
> You probably want patch 2 and 3 backported to stable.

Given that nobody has cared so far and the only board that depends on
proper PM that seems to be using this driver has bitrot quite badly in
the past and is undergoing a major rewrite currently, I'm not sure
whether it's worth it really.

I can do it if you insist though.


Thanks,
Daniel