[3.16.y-ckt stable] Patch "drm/radeon: do a posting read in rs600_set_irq" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Thu Mar 19 10:13:09 UTC 2015

This is a note to let you know that I have just added a patch titled

    drm/radeon: do a posting read in rs600_set_irq

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:


This patch is scheduled to be released in version 3.16.7-ckt9.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see



>From ec1975e134cfbb66dd1ee2a04a027ce72cc98689 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher at amd.com>
Date: Mon, 2 Mar 2015 20:39:56 -0500
Subject: drm/radeon: do a posting read in rs600_set_irq

commit 54acf107e4e66d1f4a697e08a7f60dba9fcf07c3 upstream.

To make sure the writes go through the pci bridge.


Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
 drivers/gpu/drm/radeon/rs600.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index d6e64b93d8b1..1016f53f755c 100644
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -684,6 +684,10 @@ int rs600_irq_set(struct radeon_device *rdev)
 	if (ASIC_IS_DCE2(rdev))
 		WREG32(R_007408_HDMI0_AUDIO_PACKET_CONTROL, hdmi0);
+	/* posting read */
+	RREG32(R_000040_GEN_INT_CNTL);
 	return 0;

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