[Qemu-devel] [PATCH 01/10] RTC: Remove the logic to update time format when DM bit changed

[Paolo Bonzini <pbonzini@redhat.com>]

From: Yang Zhang <yang.z.zhang@intel.com>

Changing the DM (binary/BCD) and 24/12 control bit doesn't affect the internal
registers. It only indicates what format is used for those registers.

Signed-off-by: Yang Zhang <yang.z.zhang@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/mc146818rtc.c |   10 +---------
 1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c
index 3777f85..6e5b2f0 100644
--- a/hw/mc146818rtc.c
+++ b/hw/mc146818rtc.c
@@ -220,15 +220,7 @@ static void cmos_ioport_write(void *opaque, uint32_t addr, uint32_t data)
                     rtc_set_time(s);
                 }
             }
-            if (((s->cmos_data[RTC_REG_B] ^ data) & (REG_B_DM | REG_B_24H)) &&
-                !(data & REG_B_SET)) {
-                /* If the time format has changed and not in set mode,
-                   update the registers immediately. */
-                s->cmos_data[RTC_REG_B] = data;
-                rtc_copy_date(s);
-            } else {
-                s->cmos_data[RTC_REG_B] = data;
-            }
+            s->cmos_data[RTC_REG_B] = data;
             rtc_timer_update(s, qemu_get_clock_ns(rtc_clock));
             break;
         case RTC_REG_C:
-- 
1.7.10.4