[PATCH] arm64: topology: fix arch_cpu_idle_enter()

[seanwang1]

arch_cpu_idle_enter() directly calls amu_scale_freq_tick() to update
arch_freq_scale when CPU enters idle state. This bypasses the sft_data
pointer check that topology_clear_scale_freq_source() relies on.

As a result, even after calling topology_clear_scale_freq_source() with
SCALE_FREQ_SOURCE_ARCH to disable AMU-based frequency scaling, the
arch_freq_scale value can still be modified by AMU counters when the
CPU goes idle through the arch_cpu_idle_enter() path.

Fix by replacing the direct amu_scale_freq_tick() call with
topology_scale_freq_tick(), which is the generic interface for updating
frequency scale and properly respects the sft_data pointer state.

Co-developed-by: Xuewen Yan <xuewen.yan@xxxxxxxxxx>
Signed-off-by: Sean Wang <seanwang1@xxxxxxxxxx>
Signed-off-by: Xuewen Yan <xuewen.yan@xxxxxxxxxx>
---
 arch/arm64/kernel/topology.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c
index b32f13358fbb..f617ef5c9903 100644
--- a/arch/arm64/kernel/topology.c
+++ b/arch/arm64/kernel/topology.c
@@ -176,7 +176,7 @@ void arch_cpu_idle_enter(void)
 	/* Kick in AMU update but only if one has not happened already */
 	if (housekeeping_cpu(cpu, HK_TYPE_TICK) &&
 	    time_is_before_jiffies(per_cpu(cpu_amu_samples.last_scale_update, cpu)))
-		amu_scale_freq_tick();
+		topology_scale_freq_tick();
 }
 
 #define AMU_SAMPLE_EXP_MS	20
-- 
2.25.1