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authorNico Huber <nico.huber@secunet.com>2017-01-19 16:28:18 +0100
committerMartin Roth <martinroth@google.com>2017-02-04 23:04:06 +0100
commit561bebfbaa55d5ab0656fbfc4866de88722d9618 (patch)
treefb725cf6df5e7c1093523b57ed924046ad4d423e /src/northbridge/intel/i945
parent84394616dffac91bcf94423ed02b2877fc2d270f (diff)
downloadcoreboot-561bebfbaa55d5ab0656fbfc4866de88722d9618.tar.xz
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 <nico.huber@secunet.com> Reviewed-on: https://review.coreboot.org/18186 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src/northbridge/intel/i945')
-rw-r--r--src/northbridge/intel/i945/Kconfig1
1 files changed, 1 insertions, 0 deletions
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