Re: [Qemu-devel] [PATCH] hw/char/stm32f2xx_usart: Do not update data register when device is disabled

[Peter Maydell <peter.maydell@linaro.org>]

On Fri, 4 Jan 2019 at 18:21, Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
>
> When the device is disable, the internal circuitry keep the data
> register loaded and doesn't update it.
>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  hw/char/stm32f2xx_usart.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/hw/char/stm32f2xx_usart.c b/hw/char/stm32f2xx_usart.c
> index f3363a2952..10392c70e2 100644
> --- a/hw/char/stm32f2xx_usart.c
> +++ b/hw/char/stm32f2xx_usart.c
> @@ -53,14 +53,13 @@ static void stm32f2xx_usart_receive(void *opaque, const uint8_t *buf, int size)
>  {
>      STM32F2XXUsartState *s = opaque;
>
> -    s->usart_dr = *buf;
> -
>      if (!(s->usart_cr1 & USART_CR1_UE && s->usart_cr1 & USART_CR1_RE)) {
>          /* USART not enabled - drop the chars */
>          DB_PRINT("Dropping the chars\n");
>          return;
>      }
>
> +    s->usart_dr = *buf;
>      s->usart_sr |= USART_SR_RXNE;
>
>      if (s->usart_cr1 & USART_CR1_RXNEIE) {
> --
> 2.17.2




Applied to target-arm.next, thanks (with the commit message typos fixed).

-- PMM