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drm/radeon/kms: fix MSI re-arm on rv370+

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MSI_REARM_EN register is a write only trigger register.
There is no need RMW when re-arming.

May fix:
https://bugs.freedesktop.org/show_bug.cgi?id=41668

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
CC: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher 2012-02-13 16:36:34 -05:00 committed by Dave Airlie
parent 6f9f8a6108
commit b7f5b7dec3
2 changed files with 2 additions and 6 deletions
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4
drivers/gpu/drm/radeon/r100.c
View file

@ -789,9 +789,7 @@ int r100_irq_process(struct radeon_device *rdev)
WREG32(RADEON_AIC_CNTL, msi_rearm | RS400_MSI_REARM);
break;
default:
msi_rearm = RREG32(RADEON_MSI_REARM_EN) & ~RV370_MSI_REARM_EN;
WREG32(RADEON_MSI_REARM_EN, msi_rearm);
WREG32(RADEON_MSI_REARM_EN, msi_rearm | RV370_MSI_REARM_EN);
WREG32(RADEON_MSI_REARM_EN, RV370_MSI_REARM_EN);
break;
}
}

4
drivers/gpu/drm/radeon/rs600.c
View file

@ -684,9 +684,7 @@ int rs600_irq_process(struct radeon_device *rdev)
WREG32(RADEON_BUS_CNTL, msi_rearm | RS600_MSI_REARM);
break;
default:
msi_rearm = RREG32(RADEON_MSI_REARM_EN) & ~RV370_MSI_REARM_EN;
WREG32(RADEON_MSI_REARM_EN, msi_rearm);
WREG32(RADEON_MSI_REARM_EN, msi_rearm | RV370_MSI_REARM_EN);
WREG32(RADEON_MSI_REARM_EN, RV370_MSI_REARM_EN);
break;
}
}