Radeon DRM-Next Work: GPUVM Optimizations, Deep Color HDMI

[phoronix]

Phoronix: Radeon DRM-Next Work: GPUVM Optimizations, Deep Color HDMI

The next round of Radeon DRM driver improvements have been mailed in for landing in the Linux 3.16 kernel...

http://www.phoronix.com/vr.php?view=MTcwODI

[ua=42]

d the change is to fill VM page tables from the GART page table when applicable.

Someone explain what this means?

[Ericg]

Someone explain what this means?

GART (Graphics Address Remapping Table) is what gets used to handle moving things around between video memory and main system memory. I'm not 100% sure on this but I'm thinking this goes in-hand with the recent work to make Radeon's memory allocation more optimized. So you'd have main system memory --> GART as a middle man --> Video memory.

Possible that Radeon wasn't taking advantage of all available video memory? Or was taking advantage of it but only in specific and restricted cases?

[agd5f]

Someone explain what this means?

It means we copy the PTEs from the gart table to the GPUVM tables if they are the same rather than populating them directly.

[StefanBruens]

Support of audio over DisplayPort?

Hi,

I am using a Radeon 7750, and sound works with the OSS radeon over HDMI, and Catalyst over DP, but radeon + DP does not work. As I would like to use a newer Xorg (1.16), and Catalyst is problematic in a multiseat environment, any timeline for sound over DP with radeon?

Kind regards, Stefan

[droidhacker]

Hi,

I am using a Radeon 7750, and sound works with the OSS radeon over HDMI, and Catalyst over DP, but radeon + DP does not work. As I would like to use a newer Xorg (1.16), and Catalyst is problematic in a multiseat environment, any timeline for sound over DP with radeon?

Kind regards, Stefan

I didn't think that DP actually spec'd audio.
Is that an actual DP device you are running? Or are you running an HDMI device from the DP via passive adapter?

[zanny]

I didn't think that DP actually spec'd audio.
Is that an actual DP device you are running? Or are you running an HDMI device from the DP via passive adapter?

https://en.wikipedia.org/wiki/Displayport

It is speced for 24 bit 8 channel audio.

I know at least the Intel DRM driver supports it. Not sure about the others. They show up as HDMI Audio under Pulseaudio, though.

[agd5f]

The hw supports audio over DP. Much or the audio hardware is shared between HMDI and DP. I haven't looked at what is required to get it working.

[sobkas]

So where is the latest code?

git://people.freedesktop.org/~deathsimple/linux or git://people.freedesktop.org/~agd5f/linux ?

[agd5f]

So where is the latest code?

my tree for 3.16:
git://people.freedesktop.org/~agd5f/linux