[DragonFlyBSD - Submit #3031] Update drm/radeon to Linux 4.7.10 as much as possible

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #3031 has been updated by arcade at b1t.name.

File IMG_20170705_201122.jpg added

That was so nice you waited for me to try filing a bug for this one and instead finding an open question to join.

drm0: <Trinity [Radeon HG 7560D]> at vgapci0

When loading radeonkms something is printed on the screen and screen switches somewhere. When radeonkms is loaded via `/boot/loader.conf` kernel crashes with attached screen, keyboard is no working because usb was not initialised yet. `drm.radeon.audio=0` doesn't help.

I think Xorg has nothing to do here, it just triggers loading radeonkms and "things" "happen".

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Submit #3031: Update drm/radeon to Linux 4.7.10 as much as possible
http://bugs.dragonflybsd.org/issues/3031#change-13184

* Author: davshao
* Status: In Progress
* Priority: Normal
* Assignee: ftigeot
* Category: Driver
* Target version: 
----------------------------------------
Sometimes one must go backwards before one can go forwards.  The attached patch updates drm/radeon to Linux 4.7.10 as much as possible, with the obvious exception of patches related to dma_fence, reservation objects, dma_buf, prime, DisplayPort MST, and interval trees.  In particular, because I do not have DisplayPort hardware to test, I expect complete breakage.

When I want decent font display without corruption on a CAICOS Sapphire Radeon HD6450 card, I use in a hacked version of pkgsrc for mesa 17 in /usr/pkg/share/X11/xorg.conf.d a 20-glamor.conf file resembling:

Section "Module"
    Load "dri2"
    Load "glamoregl"
EndSection
Section "Device"
    Identifier "Radeon Graphics"
    Driver "radeon"
    Option "AccelMethod" "glamor"
    Option "ShadowPrimary" "on"
EndSection

Take out the Option "ShadowPrimary" "on" and there are quite visible artifacts, but I am still able to fire up firefox using

LD_PRELOAD=/usr/pkg/lib/libGL.so firefox &

with layers acceleration forced to get some sort of display in WebGL Water:

http://madebyevan.com/webgl-water/

The patch is radeon47fast.patch generated by git format patch.  Also attached is a diff between drm/radeon after the patch compared to Linux 4.7.10's.  radeon_4_07.diff shows exactly what is left to be done.

The patch seems to apply cleanly up through at least

commit f30091155bf042c3e2934ca63573dabebe30f556
Date:   Mon Apr 24 19:22:39 2017 +0200

    <fcntl.h>: Add some missing defines (required by POSIX).

---Files--------------------------------
radeon47fast.patch (923 KB)
radeon_4_07.diff (512 KB)
IMG_20170705_201122.jpg (919 KB)


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