[Skiboot] [PATCH V7 3/3] occ: Add support for Version 0x90 OCC_OPAL shared memory region

[Vaidyanathan Srinivasan]

* Shilpa Bhat <shilpa.bhat at linux.vnet.ibm.com> [2017-04-01 14:12:03]:

> Hi,
> 
> On 02/14/2017 02:01 AM, Shilpasri G Bhat wrote:
> > This patch enables pstate table parsing support for P9. It
> > introduces below device tree changes.
> > - Add a new node per chip in /ibm,opal/power-mgt called occ.
> > 	occ at 3ffd9f8000 {
> > 		reg = <0x3f 0xfd9f8000>;
> > 		ibm,chip-id = <0x0>;
> > 		ibm,pstate-vdds = <0x4e4e4f4f 0x4f505152 0x53545556
> > 		0x5758595a 0x5b5c5d5e 0x5f606162 0x63646565 0x66676868
> > 		0x696a6a6b 0x6c6d6d6e 0x6f6f7071 0x72727374 0x74757677
> > 		0x7778797a 0x7a7b7c7c>;
> > 		ibm,pstate-vcss = <0x4446484a 0x4c4e4f50 0x50515253
> > 		0x54555556 0x5758595a 0x5a5b5c5d 0x5d5e5e5e 0x5e5f5f5f
> > 		0x5f606060 0x61616161 0x62626263 0x63636364 0x64646465
> > 		0x65656666 0x66666767>;
> > 		phandle = <0x10000326>;
> > 	};
> > - Move VID (ibm,pstate-vdds, ibm,pstate-vcss) in to the new per-chip
> >   /ibm,opal/power-mgt/occ node as these properties are unique to
> >   chip.
> > - WOF is supported from version 0x02. Till now we have been adding
> >   max ultra-turbo pstate(ibm,pstate-ultra-turbo), max turbo pstate
> >   (ibm,pstate-turbo) and max pstate-per-n-core (ibm,pstate-core-max)
> >   only when WOF is enabled. This patch will add these properties
> >   even when WOF is disabled. When WOF is disabled max ultra turbo pstate
> >   equals to max turbo pstate and max pstate-per-n-core array has all
> >   entries equal to max turbo pstate. So the above three properties
> >   are added whenever WOF is supported to ease the reporting of these
> >   data in host.
> > 
> > Signed-off-by: Shilpasri G Bhat <shilpa.bhat at linux.vnet.ibm.com>

Acked-by: Vaidyanathan Srinivasan <svaidy at linux.vnet.ibm.com>
Tested-by: Vaidyanathan Srinivasan <svaidy at linux.vnet.ibm.com>


Tested on Zaius with OCC working on two socket system.

Skiboot parsing:
[    8.476712272,7] OCC: Chip 00 Data (0000201ffd8e2000) = 01900130180c0c00
[    8.476715776,7] OCC: Chip 08 Data (0000201ffdce2000) = 01900030180c0000
[    8.476719088,5] OCC: All Chip Rdy after 0 ms
[    8.476819024,7] OCC: CPU pstate state device tree init
[    8.476821344,7] OCC: Data (    201ffd8e2000) =  1900130180c0c00                0
[    8.476825472,7] OCC: Version 90 Min 48 Nom 24 Max 12 Nr States 37


--Vaidy