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From 1e5895f2c6068fb9ae5356e3a751a29a22af5f01 Mon Sep 17 00:00:00 2001
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From: Fedora Kernel Team <kernel-team@fedoraproject.org>
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Date: Mon, 20 Jun 2016 14:53:03 +0200
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Subject: [PATCH 1/6] drm/mgag200: Black screen fix for G200e rev 4
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Upstream: since drm-fixes-for-v4.7
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commit d3922b69617b62bb2509936b68301f837229d9f0
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Author: Mathieu Larouche <mathieu.larouche@matrox.com>
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AuthorDate: Fri May 27 15:12:50 2016 -0400
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Commit: Dave Airlie <airlied@redhat.com>
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CommitDate: Wed Jun 1 15:25:04 2016 +1000
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drm/mgag200: Black screen fix for G200e rev 4
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- Fixed black screen for some resolutions of G200e rev4
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- Fixed testm & testn which had predetermined value.
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Reported-by: Jan Beulich <jbeulich@suse.com>
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Signed-off-by: Mathieu Larouche <mathieu.larouche@matrox.com>
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Cc: stable@vger.kernel.org
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Signed-off-by: Dave Airlie <airlied@redhat.com>
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---
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drivers/gpu/drm/mgag200/mgag200_mode.c | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
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index 14e64e0..d347dca 100644
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--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
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+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
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@@ -182,7 +182,7 @@ static int mga_g200se_set_plls(struct mga_device *mdev, long clock)
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}
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}
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- fvv = pllreffreq * testn / testm;
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+ fvv = pllreffreq * (n + 1) / (m + 1);
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fvv = (fvv - 800000) / 50000;
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if (fvv > 15)
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@@ -202,6 +202,14 @@ static int mga_g200se_set_plls(struct mga_device *mdev, long clock)
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WREG_DAC(MGA1064_PIX_PLLC_M, m);
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WREG_DAC(MGA1064_PIX_PLLC_N, n);
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WREG_DAC(MGA1064_PIX_PLLC_P, p);
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+
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+ if (mdev->unique_rev_id >= 0x04) {
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+ WREG_DAC(0x1a, 0x09);
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+ msleep(20);
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+ WREG_DAC(0x1a, 0x01);
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+
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+ }
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+
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return 0;
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}
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--
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2.7.4
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