http://bugs.freedesktop.org/show_bug.cgi?id=24041
Summary: [KMS] KMS fails to initalize, in a rs690
Product: DRI
Version: unspecified
Platform: Other
OS/Version: All
Status: NEW
Severity: normal
Priority: medium
Component: DRM/Radeon
AssignedTo: [email protected]
ReportedBy: [email protected]
Created an attachment (id=29707)
--> (http://bugs.freedesktop.org/attachment.cgi?id=29707)
syslog, kms fails
With a vanilla 2.6.31 kernel, and a rs690.
KMS fails to initalize with "Bad things might happen." messages, ending with
ring test failed.
By trying to find the cause, i arrived at r420_pipes_init, and put DRM_INFO
that printed the value of RADEON_RBBM_STATUS between each register access.
This resulted that KMS sucessfull started, in this run.
[drm] rs690_gpu_init1 (RBBM_STATUS=0x10000140)
[drm] rs690_gpu_init2 (RBBM_STATUS=0x10000140)
[drm] rs690_gpu_init3 (RBBM_STATUS=0x10000140) (before r420_pipes_init call)
[drm] r420_pipes_init1 (RBBM_STATUS=0x10000140) (top of r420_pipes_init)
[drm] r420_pipes_init2 (RBBM_STATUS=0x94000140) (after WREG32(0x4274, ... )
[drm] r420_pipes_init pipes 1
[drm] r420_pipes_init3 (RBBM_STATUS=0x10000140)
[drm] r420_pipes_init4 (RBBM_STATUS=0x94000140)
[drm] radeon: 1 quad pipes, 1 z pipes initialized.
[drm] rs690_gpu_init4 (RBBM_STATUS=0x10000140)
The value of RBBM_STATUS after GA_ENHANCE register write was 0x94000140
Only by putting a DRM_INFO print showed that fixes the problem, likely the
cause is a timing related.
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