[PATCH-for-9.0 2/2] hw/misc/stm32l4x5_rcc: Propagate period when enabling a clock

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

From: Arnaud Minier <arnaud.minier@telecom-paris.fr>

The "clock_set_mul_div" function doesn't propagate the clock period
to the children if it is changed (e.g. by enabling/disabling a clock
multiplexer).
This was overlooked during the implementation due to late changes.

This commit propagates the change if the multiplier or divider changes.

Fixes: ec7d83acbd ("hw/misc/stm32l4x5_rcc: Add an internal clock multiplexer object")
Signed-off-by: Arnaud Minier <arnaud.minier@telecom-paris.fr>
Signed-off-by: Inès Varhol <ines.varhol@telecom-paris.fr>
Message-ID: <20240317103918.44375-2-arnaud.minier@telecom-paris.fr>
[PMD: Check clock_set_mul_div() return value]
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/misc/stm32l4x5_rcc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/hw/misc/stm32l4x5_rcc.c b/hw/misc/stm32l4x5_rcc.c
index bc2d63528b..7ad628b296 100644
--- a/hw/misc/stm32l4x5_rcc.c
+++ b/hw/misc/stm32l4x5_rcc.c
@@ -59,7 +59,10 @@ static void clock_mux_update(RccClockMuxState *mux, bool bypass_source)
         freq_multiplier = mux->divider;
     }
 
-    clock_set_mul_div(mux->out, freq_multiplier, mux->multiplier);
+    if (clock_set_mul_div(mux->out, freq_multiplier, mux->multiplier)) {
+        clock_propagate(mux->out);
+    }
+
     clock_update(mux->out, clock_get(current_source));
 
     src_freq = clock_get_hz(current_source);
-- 
2.41.0