From d3922b69617b62bb2509936b68301f837229d9f0 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 - 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 Cc: stable@vger.kernel.org Signed-off-by: Dave Airlie --- 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 14e64e08909e..d347dca17267 100644 --- a/drivers/gpu/drm/mgag200/mgag200_mode.c +++ b/drivers/gpu/drm/mgag200/mgag200_mode.c @@ -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; } -- 2.20.1