[Skiboot] [PATCH 1/2] SLW: Remove stop1_lite and stop0 stop states

[Akshay Adiga]

Powersaving for stop0_lite and stop1_lite is observed to be quite similar
and both states resume without state loss. Using context_switch test [1]
we observe that stop0_lite has slightly lower latency, hence removing
stop1_lite.

[1] linux/tools/testing/selftests/powerpc/benchmarks/context_switch.c

Signed-off-by: Akshay Adiga <akshay.adiga at linux.vnet.ibm.com>
---
 hw/slw.c | 30 ------------------------------
 1 file changed, 30 deletions(-)

diff --git a/hw/slw.c b/hw/slw.c
index 3f9abaa..edfc783 100644
--- a/hw/slw.c
+++ b/hw/slw.c
@@ -521,36 +521,6 @@ static struct cpu_idle_states power9_cpu_idle_states[] = {
 				 | OPAL_PM_PSSCR_TR(3),
 		.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
 	{
-		.name = "stop0",
-		.latency_ns = 2000,
-		.residency_ns = 20000,
-		.flags = 0*OPAL_PM_DEC_STOP \
-		       | 0*OPAL_PM_TIMEBASE_STOP  \
-		       | 1*OPAL_PM_LOSE_USER_CONTEXT \
-		       | 0*OPAL_PM_LOSE_HYP_CONTEXT \
-		       | 0*OPAL_PM_LOSE_FULL_CONTEXT \
-		       | 1*OPAL_PM_STOP_INST_FAST,
-		.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(0) \
-				 | OPAL_PM_PSSCR_MTL(3) \
-				 | OPAL_PM_PSSCR_TR(3) \
-				 | OPAL_PM_PSSCR_ESL \
-				 | OPAL_PM_PSSCR_EC,
-		.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
-	{
-		.name = "stop1_lite", /* Enter stop1 with no state loss */
-		.latency_ns = 4900,
-		.residency_ns = 49000,
-		.flags = 0*OPAL_PM_DEC_STOP \
-		       | 0*OPAL_PM_TIMEBASE_STOP  \
-		       | 0*OPAL_PM_LOSE_USER_CONTEXT \
-		       | 0*OPAL_PM_LOSE_HYP_CONTEXT \
-		       | 0*OPAL_PM_LOSE_FULL_CONTEXT \
-		       | 1*OPAL_PM_STOP_INST_FAST,
-		.pm_ctrl_reg_val = OPAL_PM_PSSCR_RL(1) \
-				 | OPAL_PM_PSSCR_MTL(3) \
-				 | OPAL_PM_PSSCR_TR(3),
-		.pm_ctrl_reg_mask = OPAL_PM_PSSCR_MASK },
-	{
 		.name = "stop1",
 		.latency_ns = 5000,
 		.residency_ns = 50000,
-- 
2.5.5