[PATCH 3.10 18/55] drm/radeon: do a posting read in r100_set_irq
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2015-03-24 15:47:02
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3.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Deucher <alexander.deucher@amd.com> commit f957063fee6392bb9365370db6db74dc0b2dce0a upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/gpu/drm/radeon/r100.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c@@ -743,6 +743,10 @@ int r100_irq_set(struct radeon_device *r tmp |= RADEON_FP2_DETECT_MASK; } WREG32(RADEON_GEN_INT_CNTL, tmp); + + /* read back to post the write */ + RREG32(RADEON_GEN_INT_CNTL); + return 0; }