hw/char/stm32f2xx_usart: Update IRQ when DR is written

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Hans-Erik Floryd <hans-erik.floryd@rt-labs.com>
Message-id: 20231030151528.1138131-3-hans-erik.floryd@rt-labs.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/char/stm32f2xx_usart.c

@@ -168,6 +168,7 @@ static void stm32f2xx_usart_write(void *opaque, hwaddr addr,
                clear TC by writing 0 to the SR register, so set it again
                on each write. */
             s->usart_sr |= USART_SR_TC;
+            stm32f2xx_update_irq(s);
         }
         return;
     case USART_BRR: