From 084ad7f71e15e7f96d7dfe1ea1a438ae8b709255 Mon Sep 17 00:00:00 2001 From: Mathieu Larouche Date: Fri, 27 May 2016 15:12:50 -0400 Subject: [PATCH] drm/mgag200: Black screen fix for G200e rev 4 commit d3922b69617b62bb2509936b68301f837229d9f0 upstream. - Fixed black screen for some resolutions of G200e rev4 - Fixed testm & testn which had predetermined value. Reported-by: Jan Beulich Signed-off-by: Mathieu Larouche Signed-off-by: Dave Airlie Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/mgag200/mgag200_mode.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c index c99d3fe12881..e5bb40e58020 100644 --- 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 mga_device *mdev, long clock) } } - 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 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; } -- 2.34.1