From: Ville Syrjälä Date: Thu, 26 Feb 2015 19:01:52 +0000 (+0200) Subject: drm/i915: Reduce CHV DPLL min vco frequency to 4.8 GHz X-Git-Tag: v4.1-rc1~69^2~24^2~79 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=17fe10218be4663b0be1cf27805c32741eae48a8;p=karo-tx-linux.git drm/i915: Reduce CHV DPLL min vco frequency to 4.8 GHz The current minimum vco frequency leaves us with a gap in our supported frequencies at 233-243 MHz. Your typical 2560x1440@60 display wants a pixel clock of 241.5 MHz, which is just withing that gap. Reduce the allowed vco min frequency to 4.8GHz to reduce the gap to 233-240 MHz, and thus allow such displays to work. 4.8 GHz is actually the documented (at least in some docs) limit of the PLL, and we just picked 4.86 GHz originally because that was the lowest value produced by the PLL spreadsheet, which obviously didn't consider 2560x1440 displays. Signed-off-by: Ville Syrjälä Reviewed-by: Vijay Purushothaman Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 089acffb5ead..77077700b192 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -390,7 +390,7 @@ static const intel_limit_t intel_limits_chv = { * them would make no difference. */ .dot = { .min = 25000 * 5, .max = 540000 * 5}, - .vco = { .min = 4860000, .max = 6480000 }, + .vco = { .min = 4800000, .max = 6480000 }, .n = { .min = 1, .max = 1 }, .m1 = { .min = 2, .max = 2 }, .m2 = { .min = 24 << 22, .max = 175 << 22 },