http://bugs.freedesktop.org/show_bug.cgi?id=26145
Summary: [KMS] PM patches: inconsistency between clock set and
read
Product: DRI
Version: XOrg CVS
Platform: x86 (IA32)
OS/Version: Linux (All)
Status: NEW
Severity: minor
Priority: medium
Component: DRM/Radeon
AssignedTo: [email protected]
ReportedBy: [email protected]
Using drm-radeon-testing + PM patches
(http://people.freedesktop.org/~agd5f/pm/), PM is working just fine on my RV250
but shows inconsistent debug output: for low frequencies, the value read using
debugfs is about half of the value set.
I have tried arbitrary frequencies (and not just the ones read from the table),
and it looks like this weirdness is only reproducible when setting a frequency
around half of the default frequency or below that, so I tend to think the
problem is just reading the engine clock.
br...@leo:~/git/ubuntu-lucid$ dmesg | grep drm | head -n 20
[ 1.275752] [drm] Initialized drm 1.1.0 20060810
[ 1.588338] [drm] radeon defaulting to kernel modesetting.
[ 1.588343] [drm] radeon kernel modesetting enabled.
[ 1.592398] [drm] radeon: Initializing kernel modesetting.
[ 1.592520] [drm] register mmio base: 0xC0100000
[ 1.592523] [drm] register mmio size: 65536
[ 1.592931] [drm] GPU reset succeed (RBBM_STATUS=0x00000140)
[ 1.592943] [drm] 2 Power State(s)
[ 1.592946] [drm] State 0 Battery
[ 1.592948] [drm] 1 Clock Mode(s)
[ 1.592950] [drm] 0 engine/memory: 110000/110000
[ 1.592953] [drm] State 1 Default (default)
[ 1.592955] [drm] 1 Clock Mode(s)
[ 1.592958] [drm] 0 engine/memory: 252000/200000
[ 1.592970] [drm] radeon: dynamic power management enabled
[ 1.592972] [drm] radeon: power management initialized
[ 1.593077] [drm] radeon: VRAM 64M
[ 1.593080] [drm] radeon: VRAM from 0x00000000 to 0x03FFFFFF
[ 1.593082] [drm] radeon: GTT 256M
[ 1.593085] [drm] radeon: GTT from 0xD0000000 to 0xDFFFFFFF
br...@leo:~/git/ubuntu-lucid$ dmesg | tail
[ 9.432030] [drm] Requested: e: 25200 m: 20000 p: 16
[ 9.632030] [drm] Setting: e: 25200 m: 20000 p: 16
[ 10.532036] [drm] Requested: e: 11000 m: 11000 p: 0
[ 10.732030] [drm] Setting: e: 11000 m: 11000 p: 0
[ 14.808027] eth1: no IPv6 routers present
[ 18.857279] lib80211_crypt: registered algorithm 'TKIP'
[ 3142.448034] [drm] Requested: e: 25200 m: 20000 p: 16
[ 3142.648138] [drm] Setting: e: 25200 m: 20000 p: 16
[ 3143.048056] [drm] Requested: e: 11000 m: 11000 p: 0
[ 3143.248056] [drm] Setting: e: 11000 m: 11000 p: 0
br...@leo:~/git/ubuntu-lucid$ cat /sys/kernel/debug/dri/0/radeon_pm_info
state: PM_STATE_ACTIVE
default engine clock: 252000 kHz
current engine clock: 55120 kHz
default memory clock: 200000 kHz
current memory clock: 200250 kHz
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