linux-kernel - Re: [PATCHv5 1/2] ARM: socfpga: support suspend to ram

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Date:	Fri, 29 May 2015 10:54:42 -0500
From:	atull <atull@...nsource.altera.com>
To:	Dinh Nguyen <dinguyen@...nsource.altera.com>
CC:	Rob Herring <robh+dt@...nel.org>, Pavel Machek <pavel@...x.de>,
	"Arnd Bergmann" <arnd@...db.de>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	"Ian Campbell" <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	<linux-arm-kernel@...ts.infradead.org>,
	"Delicious Quinoq" <delicious.quinoa@...il.com>
Subject: Re: [PATCHv5 1/2] ARM: socfpga: support suspend to ram

On Fri, 29 May 2015, Dinh Nguyen wrote:

> 
> 
> On 5/28/15 4:19 PM, Alan Tull wrote:
> > Add code that requests that the sdr controller go into
> > self-refresh mode.  This code is run from ocram.
> > 
> > Suspend-to-RAM and EDAC support are mutually exclusive on
> > SOCFPGA.  If the EDAC is enabled, it will prevent the
> > platform from going into suspend.
> > 
> > Example of how to request to suspend to ram:
> >  $ echo enabled > \
> > /sys/devices/soc/ffc02000.serial0/tty/ttyS0/power/wakeup
> > 
> >  $ echo -n mem > /sys/power/state
> > 
> > Signed-off-by: Alan Tull <atull@...nsource.altera.com>
> > Cc: Pavel Machek <pavel@...x.de>
> > Cc: Arnd Bergmann <arnd@...db.de>
> > Cc: Dinh Nguyen <dinguyen@...nsource.altera.com>
> > Cc: Steffen Trumtrar <s.trumtrar@...gutronix.de>
> > ---
> > v2: use Generic on-chip SRAM driver to allocate ocram
> >     rm fncpy_align since generic allocator handles alignment
> >     check __arm_ioremap_exec return code
> >     check for NULL pointers
> >     add a comment regarding sdram controller configuration
> > v3: fix renamed #define
> >     propagate socfpga_setup_ocram_self_refresh error code
> > v4: Kconfig: don't need to select GENERIC_ALLOCATER
> >     add CONFIG_SOCFPGA_SUSPEND
> >     make s2r and EDAC support mutually exclusive
> >     socfpga.c: add sdr_ctl_base_addr
> >     return error if ocram not available in device tree
> >     update copyright years
> > v5: remove compile time dependency
> >     edac driver will prevent suspend
> >     don't configure scu standby mode; done in enable_scu().
> >     fix comments about required sdram controller configuration
> > ---
> >  arch/arm/mach-socfpga/Kconfig        |   10 ++-
> >  arch/arm/mach-socfpga/Makefile       |    1 +
> >  arch/arm/mach-socfpga/core.h         |    6 +-
> >  arch/arm/mach-socfpga/pm.c           |  149 ++++++++++++++++++++++++++++++++++
> >  arch/arm/mach-socfpga/self-refresh.S |  136 +++++++++++++++++++++++++++++++
> >  arch/arm/mach-socfpga/socfpga.c      |    6 +-
> >  drivers/edac/altera_edac.c           |   20 +++++
> >  7 files changed, 325 insertions(+), 3 deletions(-)
> >  create mode 100644 arch/arm/mach-socfpga/pm.c
> >  create mode 100644 arch/arm/mach-socfpga/self-refresh.S
> > 
> 
> Which branch are you basing this patch on? I got a trivial patch
> conflict in Kconfig when I applied to arm-soc/for-next and v4.1-rc5.

Based on your socfpga_for_next_arria10 branch from 
git://git.kernel.org/pub/scm/linux/kernel/git/dinguyen/linux.git

> 
> Also, I'm getting these sparse warnings:
> 
> arch/arm/mach-socfpga/pm.c:86:25: warning: incorrect type in argument 1
> (different address spaces)
> arch/arm/mach-socfpga/pm.c:86:25:    expected void *<noident>
> arch/arm/mach-socfpga/pm.c:86:25:    got void [noderef]
> <asn:2>*[assigned] suspend_ocram_base
> arch/arm/mach-socfpga/pm.c:108:52: warning: cast removes address space
> of expression
> 
> Dinh
> 

It appears to want suspend_ocram_base to be void * instead of void 
__iomem *.

Alan
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