From 561bebfbaa55d5ab0656fbfc4866de88722d9618 Mon Sep 17 00:00:00 2001 From: Nico Huber Date: Thu, 19 Jan 2017 16:28:18 +0100 Subject: drivers/intel/gma/vbt: Add Kconfig symbol for SSC ref The selection of the SSC reference frequency for LVDS was based on a completely unrelated clock. The `ssc_freq` flag should be set when the SSC reference runs at a different frequency than the general display reference clock (DREF). For most platforms, there is no choice, i.e. for i945 and gm45 the SSC reference always differs from the display reference clock (i945: 66Mhz SSC vs. 48MHz DREF; gm45: 100MHz SSC vs. 96Mhz DREF), for Nehalem and newer, it's the same frequency for SSC/non-SSC (120MHz). The only, currently supported platform with a choice seems to be Pineview, where the alternative is 100MHz vs. the default 96MHz. Change-Id: I7791754bd366c9fe6832c32eccef4657ba5f309b Signed-off-by: Nico Huber Reviewed-on: https://review.coreboot.org/18186 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth --- src/northbridge/intel/i945/Kconfig | 1 + 1 file changed, 1 insertion(+) (limited to 'src/northbridge/intel/i945/Kconfig') diff --git a/src/northbridge/intel/i945/Kconfig b/src/northbridge/intel/i945/Kconfig index efe192bf29..18e90b6ec4 100644 --- a/src/northbridge/intel/i945/Kconfig +++ b/src/northbridge/intel/i945/Kconfig @@ -24,6 +24,7 @@ config NORTHBRIDGE_SPECIFIC_OPTIONS # dummy select LAPIC_MONOTONIC_TIMER select VGA select INTEL_GMA_ACPI + select INTEL_GMA_SSC_ALTERNATE_REF select RELOCATABLE_RAMSTAGE config NORTHBRIDGE_INTEL_SUBTYPE_I945GC -- cgit v1.2.3