slw: Allow adding idle states to power-mgt node in mambo

This patch removes the check which prevents adding any idle state to
"power-mgt" node in mambo.

Power8 exposes 3 idle states- nap, fast-sleep and deep-winkle.
While fast-sleep depends on SCOMs and deep-winkle depends on SCOMs/SLW,
nap has no such dependencies and it can be enabled in mambo. Current code
checks for "fast-sleep" in hostboot provided
"ibm,enabled-idle-states" dt node for adding fast-sleep and checks
for presence of SLW for adding winkle to "power-mgt". Hence with this
change only nap will be added to "power-mgt" node in mambo on Power8.

On Power9, this patch enables all idle states which don't need SLW.

Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Shreyas B. Prabhu <shreyas@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

1 files changed, 0 insertions, 6 deletions

diff --git a/hw/slw.c b/hw/slw.c
index 12ef494..748e319 100644
--- a/hw/slw.c
+++ b/hw/slw.c
@@ -594,12 +594,6 @@ void add_cpu_idle_state_properties(void)
 		return;
 	}
 
-	/* Mambo currently misbehaves in nap mode vs. timebase, so let's
-	 * disable idle states
-	 */
-	if (chip_quirk(QUIRK_DISABLE_NAP))
-		return;
-
 	/*
 	 * Chose the right state table for the chip
 	 *