Re: [PATCH 1/1] davinci: changed SRAM allocator to shared ram.

[Subhasish Ghosh]

Hi Sekhar,

I tried this using MMC and Kelvin's suggestions, but it never came back. 
Here is a log:

root@arago:~# rtcwake -d /dev/rtc0 -s 20 -m mem
wakeup from "mem" at Tue Apr 21 14:31:13 2009
PM: Syncing filesystems ... done.
Freezing user space processes ... (elapsed 0.01 seconds) done.
Freezing remaining freezable tasks ... (elapsed 0.01 seconds) done.
Suspending console(s) (use no_console_suspend to debug)

> From the Kconfig I had enabled RTC_DRV_OMAP, CONFIG_PM, CONFIG_SUSPEND.

--------------------------------------------------
From: "Nori, Sekhar" <nsekhar@xxxxxx>
Sent: Thursday, February 24, 2011 4:57 PM
To: "Subhasish Ghosh" <subhasish@xxxxxxxxxxxxxxxxxxxx>; 
<davinci-linux-open-source@xxxxxxxxxxxxxxxxxxxx>
Cc: <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>; "Watkins, Melissa" 
<m-watkins@xxxxxx>; <sachi@xxxxxxxxxxxxxxxxxxxx>; "Kevin Hilman" 
<khilman@xxxxxxxxxxxxxxxxxxx>; "Russell King" <linux@xxxxxxxxxxxxxxxx>; 
"Michael Williamson" <michael.williamson@xxxxxxxxxxxxxxxx>; "Chemparathy, 
Cyril" <cyril@xxxxxx>; "Sergei Shtylyov" <sshtylyov@xxxxxxxxxxxxx>; "open 
list" <linux-kernel@xxxxxxxxxxxxxxx>
Subject: RE: [PATCH 1/1] davinci: changed SRAM allocator to shared ram.

> Hi Subhasish,
>
> On Thu, Feb 24, 2011 at 15:54:56, Subhasish Ghosh wrote:
> > --------------------------------------------------
> > From: "Nori, Sekhar" <nsekhar@xxxxxx>
> > Sent: Wednesday, February 23, 2011 9:00 PM
> > To: "Subhasish Ghosh" <subhasish@xxxxxxxxxxxxxxxxxxxx>;
> > <davinci-linux-open-source@xxxxxxxxxxxxxxxxxxxx>
> > Cc: <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>; "Watkins, Melissa"
> > <m-watkins@xxxxxx>; <sachi@xxxxxxxxxxxxxxxxxxxx>; "Kevin Hilman"
> > <khilman@xxxxxxxxxxxxxxxxxxx>; "Russell King" <linux@xxxxxxxxxxxxxxxx>;
> > "Michael Williamson" <michael.williamson@xxxxxxxxxxxxxxxx>; "Chemparathy,
> > Cyril" <cyril@xxxxxx>; "Sergei Shtylyov" <sshtylyov@xxxxxxxxxxxxx>; "open
> > list" <linux-kernel@xxxxxxxxxxxxxxx>
> > Subject: RE: [PATCH 1/1] davinci: changed SRAM allocator to shared ram.
> >
> > > Hi Subhasish,
> > >
> > > On Fri, Feb 11, 2011 at 19:51:28, Subhasish Ghosh wrote:
> > >> This patch modifies the sram allocator to allocate memory
> > >> from the DA8XX shared RAM.
> > >
> > > It will be nice to know if you tried suspend-to-RAM
> > > after this change and found it to be working.
> > >
> >
> > SG -- My file system is currently mounted from MMC.
> >           Suspend to RAM seems to have bug with MMC.
> >
> > (http://processors.wiki.ti.com/index.php/OMAP-L1_Linux_Drivers_Usage#Suspend-to-RAM)
>
> You can try Kevin's suggestion here:
>
> http://linux.davincidsp.com/pipermail/davinci-linux-open-source/2011-January/021807.html
>
> >           I had tried NFS earlier, but I think there is some problem with
> > NFS boot and udev with this kernel.
>
> Anyway there are some problems reported with Ethernet
> driver and suspend on the latest kernel. Folks inside
> TI are working on it.
>
> >            So, currently I will not be able to do it, but will try if I 
> > get
> > a chance.
>
> How about using ramdisk?
>
> Thanks,
> Sekhar
>
> > > Thanks,
> > > Sekhar
> > >
> > >>
> > >> Signed-off-by: Subhasish Ghosh <subhasish@xxxxxxxxxxxxxxxxxxxx>
> > >> ---
> > >>  arch/arm/mach-davinci/da850.c              |    6 +++---
> > >>  arch/arm/mach-davinci/include/mach/da8xx.h |    1 +
> > >>  2 files changed, 4 insertions(+), 3 deletions(-)
> > >>
> > >> diff --git a/arch/arm/mach-davinci/da850.c
> > >> b/arch/arm/mach-davinci/da850.c
> > >> index 3443d97..8a4de97 100644
> > >> --- a/arch/arm/mach-davinci/da850.c
> > >> +++ b/arch/arm/mach-davinci/da850.c
> > >> @@ -711,7 +711,7 @@ static struct map_desc da850_io_desc[] = {
> > >>  },
> > >>  {
> > >>  .virtual = SRAM_VIRT,
> > >> - .pfn = __phys_to_pfn(DA8XX_ARM_RAM_BASE),
> > >> + .pfn = __phys_to_pfn(DA8XX_SHARED_RAM_BASE),
> > >>  .length = SZ_8K,
> > >>  .type = MT_DEVICE
> > >>  },
> > >> @@ -1083,8 +1083,8 @@ static struct davinci_soc_info
> > >> davinci_soc_info_da850 = {
> > >>  .gpio_irq = IRQ_DA8XX_GPIO0,
> > >>  .serial_dev = &da8xx_serial_device,
> > >>  .emac_pdata = &da8xx_emac_pdata,
> > >> - .sram_dma = DA8XX_ARM_RAM_BASE,
> > >> - .sram_len = SZ_8K,
> > >> + .sram_dma = DA8XX_SHARED_RAM_BASE,
> > >> + .sram_len = SZ_128K,
> > >>  .reset_device = &da8xx_wdt_device,
> > >>  };
> > >>
> > >> diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h
> > >> b/arch/arm/mach-davinci/include/mach/da8xx.h
> > >> index cfcb223..c3c3339 100644
> > >> --- a/arch/arm/mach-davinci/include/mach/da8xx.h
> > >> +++ b/arch/arm/mach-davinci/include/mach/da8xx.h
> > >> @@ -70,6 +70,7 @@ extern unsigned int da850_max_speed;
> > >>  #define DA8XX_AEMIF_CTL_BASE 0x68000000
> > >>  #define DA8XX_DDR2_CTL_BASE 0xb0000000
> > >>  #define DA8XX_ARM_RAM_BASE 0xffff0000
> > >> +#define DA8XX_SHARED_RAM_BASE 0x80000000
> > >>
> > >>  void __init da830_init(void);
> > >>  void __init da850_init(void);
> > >> -- 
> > >> 1.7.2.3
> > >>
> > >>
> > >
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