From 91dbe5fb77a2afea04a52b432cfb4529d72096d1 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Mon, 9 Dec 2013 18:54:14 +0200 Subject: [PATCH] drm/i915: Change N divider minimum from 3 to 2 for gen2 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Bruno Prémont has a 855 machine with a 1400x1050 LVDS screen. The VBT mode is as follows: 0:"1400x1050" 0 108000 1400 1416 1528 1688 1050 1051 1054 1066 0x8 0xa The BIOS uses the following DPLL settings: DPLL = 0x90020000 FP0 = 0x2140e FP1 = 0x21207 We can't generate that pixel clock currently as we're limiting the N divider to at least 3, whereas the BIOS uses a value of 2. Let's reduce the N minimum to 2 and see what happens. Cc: Bruno Prémont Signed-off-by: Ville Syrjälä Tested-by: Bruno Prémont Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_display.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 8c4e384b8ae1..efc3391dfac5 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -91,7 +91,7 @@ intel_fdi_link_freq(struct drm_device *dev) static const intel_limit_t intel_limits_i8xx_dac = { .dot = { .min = 25000, .max = 350000 }, .vco = { .min = 930000, .max = 1400000 }, - .n = { .min = 3, .max = 16 }, + .n = { .min = 2, .max = 16 }, .m = { .min = 96, .max = 140 }, .m1 = { .min = 18, .max = 26 }, .m2 = { .min = 6, .max = 16 }, @@ -104,7 +104,7 @@ static const intel_limit_t intel_limits_i8xx_dac = { static const intel_limit_t intel_limits_i8xx_dvo = { .dot = { .min = 25000, .max = 350000 }, .vco = { .min = 930000, .max = 1400000 }, - .n = { .min = 3, .max = 16 }, + .n = { .min = 2, .max = 16 }, .m = { .min = 96, .max = 140 }, .m1 = { .min = 18, .max = 26 }, .m2 = { .min = 6, .max = 16 }, @@ -117,7 +117,7 @@ static const intel_limit_t intel_limits_i8xx_dvo = { static const intel_limit_t intel_limits_i8xx_lvds = { .dot = { .min = 25000, .max = 350000 }, .vco = { .min = 930000, .max = 1400000 }, - .n = { .min = 3, .max = 16 }, + .n = { .min = 2, .max = 16 }, .m = { .min = 96, .max = 140 }, .m1 = { .min = 18, .max = 26 }, .m2 = { .min = 6, .max = 16 }, -- 2.20.1