[PATCH-V2 2/2] arm:omap:am33xx: Add power domain data

[Hiremath, Vaibhav]

On Thu, Mar 01, 2012 at 07:14:24, Paul Walmsley wrote:
> Hi
> 
> some other observations:
> 
> On Sun, 25 Dec 2011, Vaibhav Hiremath wrote:
> 
> > +static struct powerdomain per_33xx_pwrdm = {
> > +	.name			= "per_pwrdm",
> > +	.voltdm			= { .name = "core" },
> > +	.prcm_partition		= AM33XX_PRM_PARTITION,
> > +	.prcm_offs		= AM33XX_PRM_PER_MOD,
> > +	.pwrsts			= PWRSTS_OFF_RET_ON,
> > +	.pwrsts_logic_ret	= PWRSTS_OFF_RET,
> > +	.pwrstctrl_offs		= AM33XX_PM_PER_PWRSTCTRL_OFFSET,
> > +	.pwrstst_offs		= AM33XX_PM_PER_PWRSTST_OFFSET,
> > +	.flags			= PWRDM_HAS_LOWPOWERSTATECHANGE,
> > +	.banks			= 3,
> > +	.pwrsts_mem_ret		= {
> > +		[0]	= PWRSTS_OFF_RET,	/* icss_mem */
> > +		[1]	= PWRSTS_OFF_RET,	/* per_mem */
> > +		[2]	= PWRSTS_OFF_RET,	/* ram_mem */
> > +	},
> > +	.pwrsts_mem_on		= {
> > +		[0]	= PWRSTS_ON,		/* icss_mem */
> > +		[1]	= PWRSTS_ON,		/* per_mem */
> > +		[2]	= PWRSTS_ON,		/* ram_mem */
> > +	},
> > +};
> 
> According to SPRUH73C Table 8-184 "PM_PER_PWRSTCTRL Register Field 
> Descriptions" the pwrsts_mem_on field for RAM_MEM should be 
> PWRSTS_OFF_RET_ON.
> 
> > +static struct powerdomain mpu_33xx_pwrdm = {
> > +     .name                   = "mpu_pwrdm",
> > +     .voltdm                 = { .name = "mpu" },
> > +     .prcm_partition         = AM33XX_PRM_PARTITION,
> > +     .prcm_offs              = AM33XX_PRM_MPU_MOD,
> > +     .pwrsts                 = PWRSTS_OFF_RET_ON,
> > +     .pwrsts_logic_ret       = PWRSTS_OFF_RET,
> > +     .pwrstctrl_offs         = AM33XX_PM_MPU_PWRSTCTRL_OFFSET,
> > +     .pwrstst_offs           = AM33XX_PM_MPU_PWRSTST_OFFSET,
> > +     .flags                  = PWRDM_HAS_LOWPOWERSTATECHANGE,
> > +     .banks                  = 3,
> > +     .pwrsts_mem_ret         = {
> > +             [0]     = PWRSTS_OFF_RET,       /* mpu_l1 */
> > +             [1]     = PWRSTS_OFF_RET,       /* mpu_l2 */
> > +             [2]     = PWRSTS_OFF_RET,       /* mpu_ram */
> > +     },
> 
> Again SPRUH73C Table 8-191 "PM_MPU_PWRSTCTRL Register Field Descriptions" 
> claims these should simply by PWRSTS_RET.
> 
> > +     .pwrsts_mem_on          = {
> > +             [0]     = PWRSTS_ON,            /* mpu_l1 */
> > +             [1]     = PWRSTS_ON,            /* mpu_l2 */
> > +             [2]     = PWRSTS_ON,            /* mpu_ram */
> > +     },
> > +};
> 
> And the same table claims the MPU_RAM pwrsts_mem_on field should be 
> PWRSTS_OFF_ON.
> 
> Can you please reconcile these differences and let us know which values 
> should be correct?
> 

Paul,

The initialization used in the patch is correct. Unfortunately, the TRM is 
incorrect here. I have already raised this issue with respective folks and soon it will get corrected.

Thanks,
Vaibhav

> thanks
> 
> 
> - Paul
>