diff options
Diffstat (limited to 'drivers/gpu/drm/radeon/r100.c')
| -rw-r--r-- | drivers/gpu/drm/radeon/r100.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c index 5aa299527317..5d14732dc284 100644 --- a/drivers/gpu/drm/radeon/r100.c +++ b/drivers/gpu/drm/radeon/r100.c @@ -3809,6 +3809,31 @@ void r100_fini(struct radeon_device *rdev) rdev->bios = NULL; } +/* + * Due to how kexec works, it can leave the hw fully initialised when it + * boots the new kernel. However doing our init sequence with the CP and + * WB stuff setup causes GPU hangs on the RN50 at least. So at startup + * do some quick sanity checks and restore sane values to avoid this + * problem. + */ +void r100_restore_sanity(struct radeon_device *rdev) +{ + u32 tmp; + + tmp = RREG32(RADEON_CP_CSQ_CNTL); + if (tmp) { + WREG32(RADEON_CP_CSQ_CNTL, 0); + } + tmp = RREG32(RADEON_CP_RB_CNTL); + if (tmp) { + WREG32(RADEON_CP_RB_CNTL, 0); + } + tmp = RREG32(RADEON_SCRATCH_UMSK); + if (tmp) { + WREG32(RADEON_SCRATCH_UMSK, 0); + } +} + int r100_init(struct radeon_device *rdev) { int r; @@ -3821,6 +3846,8 @@ int r100_init(struct radeon_device *rdev) radeon_scratch_init(rdev); /* Initialize surface registers */ radeon_surface_init(rdev); + /* sanity check some register to avoid hangs like after kexec */ + r100_restore_sanity(rdev); /* TODO: disable VGA need to use VGA request */ /* BIOS*/ if (!radeon_get_bios(rdev)) { |