Documentation for RGB strip on RX 7900 XTX (Reference)

[Deucher, Alexander]

[Public]

> -----Original Message-----
> From: Alexander Koskovich <AKoskovich at protonmail.com>
> Sent: Tuesday, January 9, 2024 4:59 PM
> To: Deucher, Alexander <Alexander.Deucher at amd.com>
> Cc: amd-gfx at lists.freedesktop.org
> Subject: RE: Documentation for RGB strip on RX 7900 XTX (Reference)
>
> Is the AIB/OEM for this board not AMD?
> https://www.amd.com/en/products/graphics/amd-radeon-rx-7900xtx
>

I'll double check (we usually don't produce reference boards with RGB), but my understanding is that if any of the boards available for sale on amd.com has RGB controls, the RGB control is provided by a third party vendor.

Alex

>
>
> On Tuesday, January 9th, 2024 at 4:53 PM, Deucher, Alexander
> <Alexander.Deucher at amd.com> wrote:
>
>
> >
> >
> > [AMD Official Use Only - General]
> >
> > > -----Original Message-----
> > > From: Alexander Koskovich AKoskovich at protonmail.com
> > > Sent: Tuesday, January 9, 2024 3:27 PM
> > > To: Deucher, Alexander Alexander.Deucher at amd.com
> > > Cc: amd-gfx at lists.freedesktop.org
> > > Subject: RE: Documentation for RGB strip on RX 7900 XTX (Reference)
> > >
> > > Doe AMD have documentation on the i2c data that gets sent currently
> > > though? I was hoping to figure out what you need to change in the
> > > command that gets sent to change stuff like brightness, color (red,
> > > green, blue), rainbow, morse code, etc.
> >
> >
> > It depends on the LED controller used by the AIB/OEM. The programming
> sequence is dependent on the LED controller.
> >
> > Alex
> >
> > > On Tuesday, January 9th, 2024 at 10:10 AM, Deucher, Alexander
> > > Alexander.Deucher at amd.com wrote:
> > >
> > > > [Public]
> > > >
> > > > > -----Original Message-----
> > > > > From: Alexander Koskovich AKoskovich at protonmail.com
> > > > > Sent: Monday, January 8, 2024 7:22 PM
> > > > > To: Deucher, Alexander Alexander.Deucher at amd.com
> > > > > Cc: amd-gfx at lists.freedesktop.org
> > > > > Subject: RE: Documentation for RGB strip on RX 7900 XTX
> > > > > (Reference)
> > > > >
> > > > > Currently the reference cooler from AMD does not have an
> > > > > existing RGB controller for OpenRGB, that's why I was looking
> > > > > for documentation on the I2C commands to send to the second SMU,
> > > > > so I don't risk bricking my card by sending wrong commands
> > > > > during development somehow.
> > > > >
> > > > > writeSetCMDWithData:
> > > > >
> **************************************************************
> > > > > adli2c.iSize = sizeof(ADLI2C)
> > > > > adli2c.iAction = ADL_DL_I2C_ACTIONWRITE adli2c.iAddress = 0xb4
> > > > > adli2c.iSpeed = 100
> > > > > 0 --------------------------------------------------
> > > > > Dev 0: ADL_Display_WriteAndReadSMUI2C(0, &adli2c) = 0
> > > > > adli2c.iDataSize =
> > > > > 24 i2cData[0]~[24]
> > > > > 40 51 2c 01 00 00 ff 00 ff ff ff cc 00 cc 00 00 00 ff ff ff ff
> > > > > ff ff ff
> > > > >
> > > > > From the RGB app's logs this is an example of what the official
> > > > > AMD application on Windows is sending when it changes colors on the
> RGB strip.
> > > > >
> > > > > From this can it be assumed the AMD card is using the latter
> > > > > method you mentioned with the second SMU I2C bus, in which case
> > > > > no driver changes would be needed?
> > > >
> > > > IIRC, each AIB/OEM uses its own preferred RGB controller. The
> > > > reference board just defines which i2c buses can be used. The RGB
> > > > control application is just a userspace app provided by the
> > > > AIB/OEM that calls ADL to talk to whichever i2c bus the vendor put
> > > > their RGB controller on. On Linux you can do something similar
> > > > using the i2c_dev module to open a connection to the i2c bus driver
> provided by the kernel. I believe that is what openRGB does today.
> > > > It looks like you already have the programming sequence above.
> > > >
> > > > Alex
> > > >
> > > > > On Monday, January 8th, 2024 at 5:32 PM, Deucher, Alexander
> > > > > Alexander.Deucher at amd.com wrote:
> > > > >
> > > > > > [Public]
> > > > > >
> > > > > > > -----Original Message-----
> > > > > > > From: amd-gfx amd-gfx-bounces at lists.freedesktop.org On
> > > > > > > Behalf Of Alexander Koskovich
> > > > > > > Sent: Sunday, January 7, 2024 11:19 PM
> > > > > > > To: amd-gfx at lists.freedesktop.org
> > > > > > > Subject: Documentation for RGB strip on RX 7900 XTX
> > > > > > > (Reference)
> > > > > > >
> > > > > > > Hello,
> > > > > > >
> > > > > > > I was wondering if AMD would be able provide any
> > > > > > > documentation for the RGB strip on the reference cooler
> > > > > > > (https://www.amd.com/en/products/graphics/amd-radeon-rx-
> > > > > > > 7900xtx)?
> > > > > > > It
> > > > > > > looks to be handled via I2C commands to the SMU, but having
> > > > > > > proper documentation would be extremely helpful.
> > > > > >
> > > > > > It depends on the AIB/OEM and how they designed the specific
> > > > > > board. The RGB controller will either be attached to the
> > > > > > DDCVGA i2c bus on the display hardware or the second SMU i2c
> > > > > > bus. The former will require changes to the amdgpu display
> > > > > > code to register display i2c buses that are not used by the
> > > > > > display connectors on the board so they can be used by 3rd party
> applications.
> > > > > > Currently we only register i2c buses used for display connectors.
> > > > > > The latter buses are already registered with the i2c subsystem
> > > > > > since they are used for other things like EEPROMs on server
> > > > > > and workstation cards and should be available via standard
> > > > > > Linux i2c APIs. I'm not sure what i2c LED controllers each AIB
> > > > > > vendor uses off hand. https://openrgb.org/index.html would
> > > > > > probably be a good resource for that information.
> > > > > >
> > > > > > Alex