From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sanford Rockowitz Subject: need guidance re amdgpu i2c Date: Tue, 13 Sep 2016 06:47:01 -0400 Message-ID: <57D7D925.4050306@minsoft.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0147355687==" Return-path: List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Sender: "amd-gfx" To: amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org This is a multi-part message in MIME format. --===============0147355687== Content-Type: multipart/alternative; boundary="------------000404070007020700050700" This is a multi-part message in MIME format. --------------000404070007020700050700 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable First, apologies in advance if this is not the most appropriate list for my questions. Redirection appreciated. I am the author of ddctool , a utility to manipulate monitor settings using DDC/CI over I2C. My understanding is that amdgpu provides /dev/i2c-* devices in the usual way, so that ddctool should just work without changes. But of course this needs to be tested. In this regard I have a number of questions and a request. Does the i2c interface depend in some way on whether one is running the AMDGPU-PRO driver? The most current AMD card that I own in a R9 280, which is a first generation GCN device. Phoronix suggests that first generation GCN support is in the works. Will this be soon? If not, would the current development code for amdgpu be sufficient for me to test the i2c support? If so, what would I have to do to build and install it? Or should I just plunk down a few dollars for a relatively inexpensive R7 260, which I understand is supported by the current amdgpu? Alternatively, if someone running the amdgpu driver would be willing to install and test ddctool on their system I'd be most appreciative. The git repository is here: https://github.com/rockowitz/ddctool, and there's extensive documentation on the website, www.ddctool.com. A couple of command line options of note: "--stats" reports extensive performance statistics, including counts of i2c retries required "--ddc" reports DDC protocol data errors If ddctool installs but does not seem to be working, command "ddctool environment" may provide some clues. Finally, the "ddctool interrogate" command fully exercises ddctool and probes the i2c environment. Depending on permissions, running it as root may provide additional detail. If you can capture the output and send it to me that would be most helpful.=20 Thanks in advance, Sanford Rockowitz --------------000404070007020700050700 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: 8bit First, apologies in advance if this is not the most appropriate list for my questions. Redirection appreciated.

I am the author of ddctool, a utility to manipulate monitor settings using DDC/CI over I2C.

My understanding is that amdgpu provides /dev/i2c-* devices in the usual way, so that ddctool should just work without changes. But of course this needs to be tested.

In this regard I have a number of questions and a request.

Does the i2c interface depend in some way on whether one is running the AMDGPU-PRO driver?

The most current AMD card that I own in a R9 280, which is a first generation GCN device. Phoronix suggests that first generation GCN support is in the works. Will this be soon? If not, would the current development code for amdgpu be sufficient for me to test the i2c support? If so, what would I have to do to build and install it?

Or should I just plunk down a few dollars for a relatively inexpensive R7 260, which I understand is supported by the current amdgpu?

Alternatively, if someone running the amdgpu driver would be willing to install and test ddctool on their system I'd be most appreciative. The git repository is here: https://github.com/rockowitz/ddctool, and there's extensive documentation on the website, www.ddctool.com.

A couple of command line options of note:

"--stats" reports extensive performance statistics, including counts of i2c retries required
"--ddc" reports DDC protocol data errors

If ddctool installs but does not seem to be working, command "ddctool environment" may provide some clues.

Finally, the "ddctool interrogate" command fully exercises ddctool and probes the i2c environment. Depending on permissions, running it as root may provide additional detail. If you can capture the output and send it to me that would be most helpful.

Thanks in advance,
Sanford Rockowitz

--------------000404070007020700050700-- --===============0147355687== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Content-Disposition: inline X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KYW1kLWdmeCBt YWlsaW5nIGxpc3QKYW1kLWdmeEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cHM6Ly9saXN0cy5m cmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9hbWQtZ2Z4Cg== --===============0147355687==-- From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Deucher, Alexander" Subject: RE: need guidance re amdgpu i2c Date: Tue, 13 Sep 2016 16:16:48 +0000 Message-ID: References: <57D7D925.4050306@minsoft.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0722734999==" Return-path: In-Reply-To: <57D7D925.4050306-9+fK6rGKj7RBDgjK7y7TUQ@public.gmane.org> Content-Language: en-US List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: 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