Patch "drm/mgag200: Black screen fix for G200e rev 4" has been added to the 4.4-stable tree

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

    drm/mgag200: Black screen fix for G200e rev 4

to the 4.4-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-mgag200-black-screen-fix-for-g200e-rev-4.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let [off-list ref] know about it.

From d3922b69617b62bb2509936b68301f837229d9f0 Mon Sep 17 00:00:00 2001

From: Mathieu Larouche <redacted>
Date: Fri, 27 May 2016 15:12:50 -0400
Subject: drm/mgag200: Black screen fix for G200e rev 4

From: Mathieu Larouche <redacted>

commit d3922b69617b62bb2509936b68301f837229d9f0 upstream.

- Fixed black screen for some resolutions of G200e rev4
- Fixed testm & testn which had predetermined value.

Reported-by: Jan Beulich <redacted>

Signed-off-by: Mathieu Larouche <redacted>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/mgag200/mgag200_mode.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c

@@ -194,7 +194,7 @@ static int mga_g200se_set_plls(struct mg
 			}
 		}
 
-		fvv = pllreffreq * testn / testm;
+		fvv = pllreffreq * (n + 1) / (m + 1);
 		fvv = (fvv - 800000) / 50000;
 
 		if (fvv > 15)

@@ -214,6 +214,14 @@ static int mga_g200se_set_plls(struct mg
 	WREG_DAC(MGA1064_PIX_PLLC_M, m);
 	WREG_DAC(MGA1064_PIX_PLLC_N, n);
 	WREG_DAC(MGA1064_PIX_PLLC_P, p);
+
+	if (mdev->unique_rev_id >= 0x04) {
+		WREG_DAC(0x1a, 0x09);
+		msleep(20);
+		WREG_DAC(0x1a, 0x01);
+
+	}
+
 	return 0;
 }
 

Patches currently in stable-queue which might be from mathieu.larouche@matrox.com are

queue-4.4/drm-mgag200-black-screen-fix-for-g200e-rev-4.patch