haswell: Remove limit on package C-state
With the XHCI controller enabled we no longer hang the
system when dropping into a package C-state so remove
the code that was disabling it.
Change-Id: Icd60488fd2506dac04fb6ec96a77bec265b10d8c
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/50355
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/4163
Tested-by: build bot (Jenkins)
Reviewed-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
diff --git a/src/cpu/intel/haswell/haswell_init.c b/src/cpu/intel/haswell/haswell_init.c
index 071135c..b2e6eaf 100644
--- a/src/cpu/intel/haswell/haswell_init.c
+++ b/src/cpu/intel/haswell/haswell_init.c
@@ -426,10 +426,7 @@
msr.lo |= (1 << 26); // C1 Auto Demotion Enable
msr.lo |= (1 << 25); // C3 Auto Demotion Enable
msr.lo &= ~(1 << 10); // Disable IO MWAIT redirection
- msr.lo &= ~(0xf); // Clear deepest package c-state
- /* FIXME: The deepest package c-state is set to C0/C1 to work around
- * platform instability when package C3 or deeper c-states are used. */
- msr.lo |= 0; // Deepeset package c-state is C0/C1.
+ /* The deepest package c-state defaults to factory-configured value. */
wrmsr(MSR_PMG_CST_CONFIG_CONTROL, msr);
msr = rdmsr(MSR_PMG_IO_CAPTURE_BASE);