[PATCH 3.19 029/123] drm/radeon: do a posting read in cik_set_irq
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2015-03-24 17:03:51
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3.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Deucher <alexander.deucher@amd.com> commit cffefd9bb31cd35ab745d3b49005d10616d25bdc 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/cik.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/gpu/drm/radeon/cik.c
+++ b/drivers/gpu/drm/radeon/cik.c@@ -7526,6 +7526,9 @@ int cik_irq_set(struct radeon_device *rd WREG32(DC_HPD5_INT_CONTROL, hpd5); WREG32(DC_HPD6_INT_CONTROL, hpd6); + /* posting read */ + RREG32(SRBM_STATUS); + return 0; }