linux-kernel - Re: [PATCH] ARM: AM33xx: PRM: Remove wrongly defined RSTST offset for PER Domain

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Message-ID: <576A2128.8030805@ti.com>
Date:	Wed, 22 Jun 2016 10:54:56 +0530
From:	Keerthy <a0393675@...com>
To:	Suman Anna <s-anna@...com>, Keerthy <j-keerthy@...com>,
	<rnayak@...eaurora.org>, <tony@...mide.com>
CC:	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<t-kristo@...com>, <afzal@...com>, <d-gerlach@...com>,
	<paul@...an.com>, <linux@...linux.org.uk>
Subject: Re: [PATCH] ARM: AM33xx: PRM: Remove wrongly defined RSTST offset for
 PER Domain



On Wednesday 22 June 2016 03:55 AM, Suman Anna wrote:
> Hi Keerthy,
>
> On 06/21/2016 05:08 AM, Keerthy wrote:
>> As per the TRM: http://www.ti.com/lit/ug/spruh73m/spruh73m.pdf
>> offset 0x4 is reserved for PRM_PER. Hence removing the wrongly
>> defined address offset.
>
> Thanks for the patch.  These macros are not used anywhere, so it should
> be safe to remove these. I have tested this patch with an off-tree PRUSS
> driver releasing the reset, it works as expected without throwing any
> issues.
>
> That said, the current omap_hwmod code assumes default rstst_offs and
> st_shift and tries to still write some value into the RSTCTRL register
> in am33xx_prm_deassert_hardreset(), but it didn't have any side-affects
> though on AM33xx. This is what affected the AM437x due to incorrect
> RSTST offset value. That behavior is independent of this patch though.
>
> Tested-by: Suman Anna <s-anna@...com>

Thanks for testing!

>
> regards
> Suman
>
>> Signed-off-by: Keerthy <j-keerthy@...com>
>> ---
>>   arch/arm/mach-omap2/prm33xx.h | 2 --
>>   1 file changed, 2 deletions(-)
>>
>> diff --git a/arch/arm/mach-omap2/prm33xx.h b/arch/arm/mach-omap2/prm33xx.h
>> index 2bc4ec5..66302c6 100644
>> --- a/arch/arm/mach-omap2/prm33xx.h
>> +++ b/arch/arm/mach-omap2/prm33xx.h
>> @@ -52,8 +52,6 @@
>>   /* PRM.PER_PRM register offsets */
>>   #define AM33XX_RM_PER_RSTCTRL_OFFSET		0x0000
>>   #define AM33XX_RM_PER_RSTCTRL			AM33XX_PRM_REGADDR(AM33XX_PRM_PER_MOD, 0x0000)
>> -#define AM33XX_RM_PER_RSTST_OFFSET		0x0004
>> -#define AM33XX_RM_PER_RSTST			AM33XX_PRM_REGADDR(AM33XX_PRM_PER_MOD, 0x0004)
>>   #define AM33XX_PM_PER_PWRSTST_OFFSET		0x0008
>>   #define AM33XX_PM_PER_PWRSTST			AM33XX_PRM_REGADDR(AM33XX_PRM_PER_MOD, 0x0008)
>>   #define AM33XX_PM_PER_PWRSTCTRL_OFFSET		0x000c
>>
>