Commit 226c6284 authored Mar 02, 2015 by Alex Deucher Committed by Sasha Levin Mar 28, 2015

drm/radeon: do a posting read in r100_set_irq

[ Upstream commit f957063fee6392bb9365370db6db74dc0b2dce0a ]

To make sure the writes go through the pci bridge.

bug:
https://bugzilla.kernel.org/show_bug.cgi?id=90741



Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

parent 26f16cbd

drivers/gpu/drm/radeon/r100.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -728,6 +728,10 @@ int r100_irq_set(struct radeon_device *rdev)
		tmp \|= RADEON_FP2_DETECT_MASK;
		}
		WREG32(RADEON_GEN_INT_CNTL, tmp);

		/* read back to post the write */
		RREG32(RADEON_GEN_INT_CNTL);

		return 0;
		}