Message-Id: <201209171915.45267.andres@anarazel.de>
Date:	Mon, 17 Sep 2012 19:15:45 +0200
From:	Andres Freund <andres@...razel.de>
To:	"Deucher, Alexander" <Alexander.Deucher@....com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	David Airlie <airlied@...ux.ie>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: radeon: Regression between v3.6-rc4 and v3.6-rc6: unable to allocate a PPLL

Hi,

On Monday, September 17, 2012 04:24:08 PM Deucher, Alexander wrote:
> > On Monday, September 17, 2012 03:16:56 PM Deucher, Alexander wrote:
> > > > While debugging another issue I upgraded from v3.6-rc4 to latest git
> > > > (which exactly is v3.6-rc6). After X started up one of my three
> > > > monitors blacked out. A look into the kernel log revealed:
> > > > [drm:radeon_atom_pick_pll] *ERROR* unable to allocate a PPLL
> > > 
> > > What 3 monitors are you using (DVI, HDMI, DP, VGA)? Note that there are
> > > only 2 PLLs for non-DP monitors, so if you are trying to use more than
> > > 2 non-DP monitors, it's not supported right now and if it worked
> > > before, it was random luck.  If you want to use 3+ monitors, only 2
> > > can be non-DP, the rest need to be DP.  If you use a DP to DVI/HDMI
> > > adapter, it must be active (looks like DP to the GPU), passive
> > > adapters just pass through native DVI/HDMI.  That said, I've got a set
> > > of patches for 3.7 to allow PLL sharing properly for non-DP displays,
> > > but it's too invasive for -fixes.
> > 
> > 2DVI, 1DP via an supposedly active converter. I can try a native DP
> > cable, its just too short, so I will have to move the monitor to the
> > ground ;)
> > 
> > Can I check its really an active connector?
> 
> Try the attached debugging patch.  It will tell us what PPLLs are getting
> allocated and what type of sink we detect on the DP port (DP or non-DP)
[    1.844382] [drm] Initialized drm 1.1.0 20060810
[    1.867560] [drm] radeon defaulting to kernel modesetting.
[    1.890474] [drm] radeon kernel modesetting enabled.
[    1.913006] fb: conflicting fb hw usage radeondrmfb vs VGA16 VGA - removing 
generic driver
[    1.981793] [drm] initializing kernel modesetting (BARTS 0x1002:0x6738 
0x174B:0x174B).
[    1.982323] [drm] register mmio base: 0xFBEC0000
[    1.982522] [drm] register mmio size: 131072
[    1.983880] [drm] Detected VRAM RAM=1024M, BAR=256M
[    1.984072] [drm] RAM width 256bits DDR
[    1.985141] [drm] radeon: 1024M of VRAM memory ready
[    1.985345] [drm] radeon: 512M of GTT memory ready.
[    1.985575] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[    1.985779] [drm] Driver supports precise vblank timestamp query.
[    1.986252] [drm] radeon: irq initialized.
[    1.986454] [drm] GART: num cpu pages 131072, num gpu pages 131072
[    1.987226] [drm] probing gen 2 caps for device 8086:340a = 2/0
[    1.987426] [drm] enabling PCIE gen 2 link speeds, disable with 
radeon.pcie_gen2=0
[    1.987930] [drm] Loading BARTS Microcode
[    1.990807] [drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
[    2.008503] [drm] ring test on 0 succeeded in 3 usecs
[    2.009029] [drm] ib test on ring 0 succeeded in 0 usecs
[    2.009728] [drm] Radeon Display Connectors
[    2.009914] [drm] Connector 0:
[    2.010103] [drm]   DP-1
[    2.010283] [drm]   HPD4
[    2.010464] [drm]   DDC: 0x6430 0x6430 0x6434 0x6434 0x6438 0x6438 0x643c 
0x643c
[    2.010734] [drm]   Encoders:
[    2.010921] [drm]     DFP1: INTERNAL_UNIPHY2
[    2.011112] [drm] Connector 1:
[    2.011295] [drm]   HDMI-A-1
[    2.011478] [drm]   HPD3
[    2.011662] [drm]   DDC: 0x6460 0x6460 0x6464 0x6464 0x6468 0x6468 0x646c 
0x646c
[    2.011932] [drm]   Encoders:
[    2.012119] [drm]     DFP2: INTERNAL_UNIPHY2
[    2.012324] [drm] Connector 2:
[    2.012512] [drm]   DVI-D-1
[    2.012695] [drm]   HPD1
[    2.012881] [drm]   DDC: 0x6480 0x6480 0x6484 0x6484 0x6488 0x6488 0x648c 
0x648c
[    2.013152] [drm]   Encoders:
[    2.013340] [drm]     DFP3: INTERNAL_UNIPHY1
[    2.013528] [drm] Connector 3:
[    2.013712] [drm]   DVI-I-1
[    2.013898] [drm]   HPD6
[    2.014082] [drm]   DDC: 0x6470 0x6470 0x6474 0x6474 0x6478 0x6478 0x647c 
0x647c
[    2.014352] [drm]   Encoders:
[    2.014538] [drm]     DFP4: INTERNAL_UNIPHY
[    2.014724] [drm]     CRT1: INTERNAL_KLDSCP_DAC1
[    2.015014] [drm] Internal thermal controller with fan control
[    2.016370] [drm] radeon: power management initialized
[    2.022137] [drm] DP sink type 0x13
[    2.133666] [drm] fb mappable at 0xD0142000
[    2.133793] [drm] vram apper at 0xD0000000
[    2.133919] [drm] size 16384000
[    2.134044] [drm] fb depth is 24
[    2.134170] [drm]    pitch is 10240
[    2.134358] fbcon: radeondrmfb (fb0) is primary device
[    2.134901] [drm] crtc 0 using pll 0x2
[    2.362257] [drm] crtc 1 using pll 0x1
[    2.386709] [drm] crtc 2 using pll 0x0
[    2.472275] fb0: radeondrmfb frame buffer device
[    2.472300] drm: registered panic notifier
[    2.472325] [drm] Initialized radeon 2.22.0 20080528 for 0000:08:00.0 on 
minor 0
[   60.056358] [drm] DP sink type 0x13
[   60.205905] [drm] DP sink type 0x13
[   60.679305] [drm:radeon_atom_pick_pll] *ERROR* unable to allocate a PPLL
[   60.679310] [drm] crtc 0 using pll 0xff
[   60.789183] [drm] crtc 1 using pll 0x2
[   60.819594] [drm] crtc 2 using pll 0x1
[   61.926401] [drm] DP sink type 0x13
[   73.022055] [drm] DP sink type 0x13
[   73.567827] [drm] DP sink type 0x13
[ 2654.041357] [drm] crtc 0 using pll 0x2
[ 2654.146105] [drm] crtc 1 using pll 0x0
[ 2654.193906] [drm] crtc 2 using pll 0x1
[ 2699.743567] [drm] DP sink type 0x13
[ 2699.892998] [drm] DP sink type 0x13
[ 2699.982947] [drm:radeon_atom_pick_pll] *ERROR* unable to allocate a PPLL
[ 2699.982950] [drm] crtc 0 using pll 0xff
[ 2700.104885] [drm] crtc 1 using pll 0x2
[ 2700.150563] [drm] crtc 2 using pll 0x1
[ 2700.289148] [drm] DP sink type 0x13
[ 2700.785181] [drm] DP sink type 0x13
[ 2730.400834] [drm] crtc 0 using pll 0x2
[ 2730.448034] [drm] crtc 1 using pll 0x0
[ 2730.490630] [drm] crtc 2 using pll 0x1
[ 2737.092937] [drm] DP sink type 0x13
[ 2737.242505] [drm] DP sink type 0x13
[ 2737.331883] [drm:radeon_atom_pick_pll] *ERROR* unable to allocate a PPLL
[ 2737.331886] [drm] crtc 0 using pll 0xff
[ 2737.453714] [drm] crtc 1 using pll 0x2
[ 2737.509907] [drm] crtc 2 using pll 0x1
[ 2737.645287] [drm] DP sink type 0x13
[ 2738.207736] [drm] DP sink type 0x13
[ 2763.766354] [drm] DP sink type 0x13
[ 2763.882633] [drm] DP sink type 0x13
[ 2764.118995] [drm] crtc 0 using pll 0x2
[ 2764.223623] [drm] crtc 1 using pll 0x0
[ 2764.273047] [drm] crtc 2 using pll 0x1
[ 2767.566733] [drm] DP sink type 0x13

> > The patchset you referenced is in alexdeucher/drm-next-3.7-wip if I saw
> > that correctly? Will test it with a passive connector I have lying
> > arround.
> 
> Yes.  Note that PLLs can only be shared for non-DP monitors if the clocks
> are the same.
That should be fine, two of the three monitors are the same.

Greetings,

Andres
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