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Date: Mon, 25 Jul 2016 13:55:08 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Jan Beulich <jbeulich@...e.com>, Mathieu Larouche <mathieu.larouche@...rox.com>, Dave Airlie <airlied@...hat.com> Subject: [PATCH 4.6 093/203] drm/mgag200: Black screen fix for G200e rev 4 4.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mathieu Larouche <mathieu.larouche@...rox.com> commit d3922b69617b62bb2509936b68301f837229d9f0 upstream. - Fixed black screen for some resolutions of G200e rev4 - Fixed testm & testn which had predetermined value. Reported-by: Jan Beulich <jbeulich@...e.com> Signed-off-by: Mathieu Larouche <mathieu.larouche@...rox.com> Signed-off-by: Dave Airlie <airlied@...hat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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 @@ -182,7 +182,7 @@ 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) @@ -202,6 +202,14 @@ 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; }
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