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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
- Fixed testm & testn which had predetermined value.

Reported-by: Jan Beulich <jbeulich@suse.com>

Signed-off-by: Mathieu Larouche <mathieu.larouche@matrox.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Mathieu Larouche 2016-05-27 15:12:50 -04:00 committed by Dave Airlie
parent afe705be38
commit d3922b6961
1 changed files with 9 additions and 1 deletions
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10
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)
}
}
fvv = pllreffreq * testn / testm;
fvv = pllreffreq * (n + 1) / (m + 1);
fvv = (fvv - 800000) / 50000;
if (fvv > 15)
@ -202,6 +202,14 @@ static int mga_g200se_set_plls(struct mga_device *mdev, long clock)
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;
}