linux-kernel - Re: [PATCH 2/8] ARM: OMAP2+: Remove unconfigured midlemode for am3 lcdc

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Message-ID: <52328e14-58b2-2ea1-8b0a-33548a1c6a7a@ti.com>
Date:   Wed, 24 Jul 2019 11:20:20 +0530
From:   Keerthy <j-keerthy@...com>
To:     Suman Anna <s-anna@...com>, Tony Lindgren <tony@...mide.com>,
        <linux-omap@...r.kernel.org>, Jyri Sarha <jsarha@...com>
CC:     Dave Gerlach <d-gerlach@...com>, Faiz Abbas <faiz_abbas@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nishanth Menon <nm@...com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Roger Quadros <rogerq@...com>, Tero Kristo <t-kristo@...com>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/8] ARM: OMAP2+: Remove unconfigured midlemode for am3
 lcdc



On 24/07/19 12:33 AM, Suman Anna wrote:
> + Jyri
> 
> On 7/23/19 6:28 AM, Tony Lindgren wrote:
>> We currently get a warning for lcdc because of a difference
>> with dts provided configuration compared to the legacy platform
>> data. This is because lcdc has SYSC_HAS_MIDLEMODE configured in
>> the platform data without configuring the modes.
> 
> Hi Tony,
> While I understand that you are trying to match the DT data with the
> existing legacy data, do you know if there was a reason why this was
> omitted in the first place? Should we be really adding the MSTANDBY_
> flags and fix up the DTS node accordingly? I tried looking through the
> git log, and the initial commit itself didn't add the MSTANDBY_ flags
> but used the SYSC_HAS_MIDLEMODE.
> 
> Jyri,
> Do you know the history?

Tony/Suman,

This patch breaks DS0 on am3.

- Keerthy

> 
> regards
> Suman
> 
>>
>> Let's fix the warning by removing SYSC_HAS_MIDLEMODE. Note that
>> the am335x TRM lists SYSC_HAS_MIDLEMODE, but it is unused.
> 
> 
> 
>>
>> Signed-off-by: Tony Lindgren <tony@...mide.com>
>> ---
>>   arch/arm/mach-omap2/omap_hwmod_33xx_data.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/mach-omap2/omap_hwmod_33xx_data.c b/arch/arm/mach-omap2/omap_hwmod_33xx_data.c
>> --- a/arch/arm/mach-omap2/omap_hwmod_33xx_data.c
>> +++ b/arch/arm/mach-omap2/omap_hwmod_33xx_data.c
>> @@ -231,7 +231,7 @@ static struct omap_hwmod am33xx_control_hwmod = {
>>   static struct omap_hwmod_class_sysconfig lcdc_sysc = {
>>   	.rev_offs	= 0x0,
>>   	.sysc_offs	= 0x54,
>> -	.sysc_flags	= (SYSC_HAS_SIDLEMODE | SYSC_HAS_MIDLEMODE),
>> +	.sysc_flags	= SYSC_HAS_SIDLEMODE,
>>   	.idlemodes	= (SIDLE_FORCE | SIDLE_NO | SIDLE_SMART),
>>   	.sysc_fields	= &omap_hwmod_sysc_type2,
>>   };
>>
>