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drm/radeon: do a posting read in rs600_set_irq

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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
This commit is contained in:
Alex Deucher 2015-03-02 20:39:56 -05:00
parent f957063fee
commit 54acf107e4
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/radeon/rs600.c
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@ -694,6 +694,10 @@ int rs600_irq_set(struct radeon_device *rdev)
WREG32(R_007D18_DC_HOT_PLUG_DETECT2_INT_CONTROL, hpd2);
if (ASIC_IS_DCE2(rdev))
WREG32(R_007408_HDMI0_AUDIO_PACKET_CONTROL, hdmi0);
/* posting read */
RREG32(R_000040_GEN_INT_CNTL);
return 0;
}