[U-Boot] [PATCH 1/4] Add deep sleep framework support for Freescale QorIQ platforms

[York Sun <yorksun@freescale.com>]

Yuantian,

I examined current code closely and have two suggestions:

1. In initdram() function, add a call to fsl_dp_resume()
It is rational because the deep sleep resume is mainly dealing with memory. Doing this means you need to add calls to all boards with deep sleep feature enabled, not a lot at this moment.
2. Add a new hook at exact location you proposed
But change to a more generic name, eg misc_ram. Add a weak function misc_ram() doing nothing. Then you can add misc_ram() in board file where it is needed.

Both require to put a hook in all boards with deep sleep enabled.

York



From: Tang Yuantian-B29983 <Yuantian.Tang at freescale.com<mailto:Yuantian.Tang@freescale.com>>
Date: Wednesday, October 22, 2014 8:26 PM
To: York Sun <yorksun at freescale.com<mailto:yorksun@freescale.com>>, Tom Rini <trini at ti.com<mailto:trini@ti.com>>
Cc: "albert.u.boot at aribaud.net<mailto:albert.u.boot@aribaud.net>" <albert.u.boot at aribaud.net<mailto:albert.u.boot@aribaud.net>>, Jin Zhengxiong-R64188 <Jason.Jin at freescale.com<mailto:Jason.Jin@freescale.com>>, "u-boot at lists.denx.de<mailto:u-boot@lists.denx.de>" <u-boot at lists.denx.de<mailto:u-boot@lists.denx.de>>
Subject: RE: [U-Boot] [PATCH 1/4] Add deep sleep framework support for Freescale QorIQ platforms

Thanks for your hint. Unfortunately I can?t find such place.
It needs to be placed between DDR initialization and relocation.
It is used on both PPC and ARM platforms.
Do you have any sugguestions?

Thanks,
Yuantian

From: Sun York-R58495
Sent: Thursday, October 23, 2014 11:06 AM
To: Tang Yuantian-B29983; Tom Rini
Cc: albert.u.boot at aribaud.net<mailto:albert.u.boot@aribaud.net>; Jin Zhengxiong-R64188; u-boot at lists.denx.de<mailto:u-boot@lists.denx.de>
Subject: RE: [U-Boot] [PATCH 1/4] Add deep sleep framework support for Freescale QorIQ platforms


Yuantian,

Tom didn't suggest a specific hook. If you can use existing one, you don't have to create a new one. It's preferred if you can find a good place in existing xxx_f functions.

York

-------- Original Message --------
From: Tang Yuantian-B29983
Sent: Wed, 22/10/2014 19:53
To: Tom Rini
CC: albert.u.boot at aribaud.net<mailto:albert.u.boot@aribaud.net>; Jin Zhengxiong-R64188 ; u-boot at lists.denx.de<mailto:u-boot@lists.denx.de>; Sun York-R58495
Subject: RE: [U-Boot] [PATCH 1/4] Add deep sleep framework support for Freescale QorIQ platforms

> -----Original Message-----
> From: Tom Rini [mailto:tom.rini at gmail.com] On Behalf Of Tom Rini
> Sent: Wednesday, October 22, 2014 9:54 PM
> To: Tang Yuantian-B29983
> Cc: albert.u.boot at aribaud.net<mailto:albert.u.boot@aribaud.net>; Jin Zhengxiong-R64188; u-boot at lists.denx.de<mailto:u-boot@lists.denx.de>;
> Sun York-R58495
> Subject: Re: [U-Boot] [PATCH 1/4] Add deep sleep framework support for
> Freescale QorIQ platforms
>
> On Sun, Sep 28, 2014 at 04:59:45PM +0800, Yuantian.Tang at freescale.com<mailto:Yuantian.Tang@freescale.com>
> wrote:
> > From: Tang Yuantian <Yuantian.Tang at freescale.com<mailto:Yuantian.Tang@freescale.com>>
> >
> > When Freescale QorIQ SoCs wake up from deep sleep, control is passed
> > to the primary core that starts executing uboot. After re-initialized
> > some IP blocks, like DDRC, kernel will take responsibility to continue
> > to restore environment it leaves before.
> >
> > This patch adds the deep sleep framework support for all Freescale
> > QorIQ platforms that use generic_board configuation.
> >
> > Signed-off-by: Tang Yuantian <Yuantian.Tang at freescale.com<mailto:Yuantian.Tang@freescale.com>>
> > ---
> >  common/board_f.c               | 10 +++++++++
> >  drivers/ddr/fsl/arm_ddr_gen3.c | 48
> +++++++++++++++++++++++++++++++++++++-----
> >  include/fsl_ddr_sdram.h        |  2 ++
> >  include/fsl_sleep.h            | 32 ++++++++++++++++++++++++++++
> >  4 files changed, 87 insertions(+), 5 deletions(-)  create mode 100644
> > include/fsl_sleep.h
> >
> > diff --git a/common/board_f.c b/common/board_f.c index
> > e6aa298..b736d29 100644
> > --- a/common/board_f.c
> > +++ b/common/board_f.c
> > @@ -56,6 +56,9 @@
> >  #endif
> >  #include <dm/root.h>
> >  #include <linux/compiler.h>
> > +#ifdef CONFIG_FSL_DEEP_SLEEP
> > +#include <fsl_sleep.h>
> > +#endif
> >
> >  /*
> >   * Pointer to initial global data area @@ -921,6 +924,9 @@ static
> > init_fnc_t init_sequence_f[] = {  #if defined(CONFIG_MIPS) ||
> > defined(CONFIG_PPC)
> >      init_func_ram,
> >  #endif
> > +#ifdef CONFIG_FSL_DEEP_SLEEP
> > +   fsl_dp_resume,
> > +#endif
>
> Is there not an existing hook you can use here instead?  Is misc_init_f too early?
Misc_init_f is too early, we need to put it between DDR initialization and relocation.

> If we're going to add a new hook in here, it needs to be somewhat generically
> named, with the requirements of the system spelled out.
It is Freescale specific. Wouldn't be a misleading for other platforms that don't jump to kernel here?

> Some TI parts have a
> (setting aside marketing-speak) similar function and I believe the U-Boot patches
> for that use an existing hook to notice what happened and do what's needed.
Which function did you refer to? I can check if it can be used.

Thanks,
Yuantian

> Thanks!
>

> --
> Tom