Patch "drm/radeon/ci: disable mclk switching for high refresh rates (v2)" has been added to the 3.18-stable tree

Patch "drm/radeon/ci: disable mclk switching for high refresh rates (v2)" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/radeon/ci: disable mclk switching for high refresh rates (v2)

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-radeon-ci-disable-mclk-switching-for-high-refresh-rates-v2.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 58d7e3e427db1bd68f33025519a9468140280a75 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 11 May 2017 13:14:14 -0400
Subject: drm/radeon/ci: disable mclk switching for high refresh rates (v2)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Alex Deucher <alexander.deucher@amd.com>

commit 58d7e3e427db1bd68f33025519a9468140280a75 upstream.

Even if the vblank period would allow it, it still seems to
be problematic on some cards.

v2: fix logic inversion (Nils)

bug: https://bugs.freedesktop.org/show_bug.cgi?id=96868

Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/radeon/ci_dpm.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/gpu/drm/radeon/ci_dpm.c
+++ b/drivers/gpu/drm/radeon/ci_dpm.c
@@ -732,6 +732,12 @@ bool ci_dpm_vblank_too_short(struct rade
 	u32 vblank_time = r600_dpm_get_vblank_time(rdev);
 	u32 switch_limit = pi->mem_gddr5 ? 450 : 300;
 
+	/* disable mclk switching if the refresh is >120Hz, even if the
+        * blanking period would allow it
+        */
+	if (r600_dpm_get_vrefresh(rdev) > 120)
+		return true;
+
 	if (vblank_time < switch_limit)
 		return true;
 	else


Patches currently in stable-queue which might be from alexander.deucher@amd.com are

queue-3.18/drm-radeon-ci-disable-mclk-switching-for-high-refresh-rates-v2.patch

Patch "drm/radeon/ci: disable mclk switching for high refresh rates (v2)" has been added to the 3.18-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/radeon/ci: disable mclk switching for high refresh rates (v2)

to the 3.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-radeon-ci-disable-mclk-switching-for-high-refresh-rates-v2.patch
and it can be found in the queue-3.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From ab03d9fe508f4e2914a8f4a9eef1b21051cacd0f Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 11 May 2017 13:14:14 -0400
Subject: drm/radeon/ci: disable mclk switching for high refresh rates (v2)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Alex Deucher <alexander.deucher@amd.com>

commit ab03d9fe508f4e2914a8f4a9eef1b21051cacd0f upstream.

Even if the vblank period would allow it, it still seems to
be problematic on some cards.

v2: fix logic inversion (Nils)

bug: https://bugs.freedesktop.org/show_bug.cgi?id=96868

Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/radeon/ci_dpm.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/gpu/drm/radeon/ci_dpm.c
+++ b/drivers/gpu/drm/radeon/ci_dpm.c
@@ -738,6 +738,12 @@ bool ci_dpm_vblank_too_short(struct rade
 	if (r600_dpm_get_vrefresh(rdev) > 120)
 		return true;
 
+	/* disable mclk switching if the refresh is >120Hz, even if the
+        * blanking period would allow it
+        */
+	if (r600_dpm_get_vrefresh(rdev) > 120)
+		return true;
+
 	if (vblank_time < switch_limit)
 		return true;
 	else


Patches currently in stable-queue which might be from alexander.deucher@amd.com are

queue-3.18/drm-radeon-ci-disable-mclk-switching-for-high-refresh-rates-v2.patch