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From: Hannes.Schmelzer@br-automation.com (Hannes Schmelzer)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] memory: omap-gpmc: Add Kconfig option for debug
Date: Fri, 28 Aug 2015 06:44:02 +0200	[thread overview]
Message-ID: <OF3C55E837.F60C3642-ONC1257EAF.0019FAE8-C1257EAF.001A0165@br-automation.com> (raw)
In-Reply-To: <20150827165940.GY4215@atomide.com>

> 
> Hi,
Hi,

> 
> * Hannes Schmelzer <Hannes.Schmelzer@br-automation.com> [150826 22:55]:
> > Hi Tony,
> > 
> > Did anyone test this changeset on some AM335x board?
> 
> Apparently not if it does not work or else you somehow have a different
> configuration for GPMC.
> 
> > Today I ran into trouble with that because:
> > 
> > The GPMC controller gets reseted on kernel boot due to the 
missing/removed 
> > HWMOD_INIT_NO_RESET flag.
> 
> Oh so you mean it only works on am335x if CONFIG_OMAP_GPMC_DEBUG is set?
Exactly.

> 
> > I also tried to issue some SYSRESET through GPMC registers without 
> > success, same strange behavior.
> 
> Interesting, never heard of that one before.

Unfortunately i only have my B&R hardware to test,
maybe somebody else has an am335x board with NAND flash on it and can 
test.


> > What?s your thinking around that?
> 
> We could add a custom hwmod reset function that sets GPMC_CONFIG to 0.
> Similar to omap_i2c_reset() is set up. 
This would be possible, but we've to take care that such functions isn't 
called during the new introduced debug-case.


> Or we could set up a property for
> the wait pin polarity. Roger, got any better ideas?

In general, it would be a good idea to introduce a dt-property to control 
the polarity of the wait pins, since there is allready a property to 
select the wait pin - this would make the thing complete.

> 
> Regards,
> Tony

best regards,
Hannes

  reply	other threads:[~2015-08-28  4:44 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-05-20 21:21 [PATCH 0/2] omap gpmc changes for parsing devices and working debug Tony Lindgren
2015-05-20 21:21 ` [PATCH 1/2] memory: omap-gpmc: Fix parsing of devices Tony Lindgren
2015-05-20 21:21 ` [PATCH 2/2] memory: omap-gpmc: Add Kconfig option for debug Tony Lindgren
2015-05-20 22:50   ` Paul Walmsley
2015-05-20 22:56     ` Tony Lindgren
2015-05-21  1:06       ` Paul Walmsley
2015-08-27  6:25   ` Hannes Schmelzer
     [not found]   ` <OFCA2F1DCE.C787A961-ONC1257EAE.001D79BC-C1257EAE.00203AFF@br-automation.com>
2015-08-27 16:59     ` Tony Lindgren
2015-08-28  4:44       ` Hannes Schmelzer [this message]
2015-09-01 12:35     ` Roger Quadros
2015-09-01 13:31       ` Antwort: " Hannes Schmelzer
2015-09-02 14:43         ` Roger Quadros
2015-09-01 12:35     ` Roger Quadros
2016-01-01 11:29   ` Ivaylo Dimitrov
2016-01-04 17:02     ` Tony Lindgren
2016-01-04 17:34       ` Pali Rohár
2016-01-04 17:40         ` Tony Lindgren
2016-01-04 18:59           ` Ivaylo Dimitrov
2016-01-05  4:13             ` Tony Lindgren
2016-01-05  8:49               ` Pali Rohár
2016-01-05 22:49                 ` Tony Lindgren
2016-01-06  8:55                   ` Ivaylo Dimitrov
2016-01-06  9:05                     ` Pali Rohár
2016-01-06 16:44                       ` Tony Lindgren
2016-01-06 17:36                   ` Aaro Koskinen
2016-01-06 17:40                   ` Sebastian Reichel
2016-01-06 17:47                     ` Tony Lindgren
2016-01-06 18:01                       ` Ivaylo Dimitrov
2016-01-06 18:26                         ` Tony Lindgren
2016-01-06 18:39                           ` Ivaylo Dimitrov
2016-01-07 18:07                             ` Tony Lindgren
2016-01-07 21:45                               ` Ivaylo Dimitrov
2016-01-08  2:26                                 ` Tony Lindgren
2016-01-08  5:13                                   ` Ivaylo Dimitrov
2016-01-08  7:59                                     ` Pali Rohár
2016-01-09  0:23                                       ` Ivaylo Dimitrov
2016-01-21  9:14                                         ` Pali Rohár
2016-02-02  9:33                                           ` Ivaylo Dimitrov
2016-02-02 23:39                                             ` Tony Lindgren
2016-02-03  0:00                                               ` Tony Lindgren
2016-02-03  7:03                                                 ` Ivaylo Dimitrov
2016-02-03 16:50                                                   ` Ivaylo Dimitrov
2016-02-05  6:10                                                     ` Tony Lindgren
2016-02-05 14:43                                                       ` Ivaylo Dimitrov
2016-01-08 17:10                                     ` Tony Lindgren
2016-01-08  7:56                                   ` Pali Rohár
2016-01-08 17:04                                     ` Tony Lindgren

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