Re: [PATCH-for-9.0 1/2] hw/clock: Let clock_set_mul_div() return boolean value

[Luc Michel]

On 16:58 Fri 22 Mar     , Philippe Mathieu-Daudé wrote:
> Let clock_set_mul_div() return a boolean value whether the
> clock has been updated or not, similarly to clock_set().
> 
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

Acked-by: Luc Michel <luc@lmichel.fr>

> ---
>  include/hw/clock.h | 4 +++-
>  hw/core/clock.c    | 8 +++++++-
>  2 files changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/include/hw/clock.h b/include/hw/clock.h
> index bb12117f67..eb58599131 100644
> --- a/include/hw/clock.h
> +++ b/include/hw/clock.h
> @@ -357,6 +357,8 @@ char *clock_display_freq(Clock *clk);
>   * @multiplier: multiplier value
>   * @divider: divider value
>   *
> + * @return: true if the clock is changed.
> + *
>   * By default, a Clock's children will all run with the same period
>   * as their parent. This function allows you to adjust the multiplier
>   * and divider used to derive the child clock frequency.
> @@ -374,6 +376,6 @@ char *clock_display_freq(Clock *clk);
>   * Note that this function does not call clock_propagate(); the
>   * caller should do that if necessary.
>   */
> -void clock_set_mul_div(Clock *clk, uint32_t multiplier, uint32_t divider);
> +bool clock_set_mul_div(Clock *clk, uint32_t multiplier, uint32_t divider);
>  
>  #endif /* QEMU_HW_CLOCK_H */
> diff --git a/hw/core/clock.c b/hw/core/clock.c
> index d82e44cd1a..a19c7db7df 100644
> --- a/hw/core/clock.c
> +++ b/hw/core/clock.c
> @@ -143,14 +143,20 @@ char *clock_display_freq(Clock *clk)
>      return freq_to_str(clock_get_hz(clk));
>  }
>  
> -void clock_set_mul_div(Clock *clk, uint32_t multiplier, uint32_t divider)
> +bool clock_set_mul_div(Clock *clk, uint32_t multiplier, uint32_t divider)
>  {
>      assert(divider != 0);
>  
> +    if (clk->multiplier == multiplier && clk->divider == divider) {
> +        return false;
> +    }
> +
>      trace_clock_set_mul_div(CLOCK_PATH(clk), clk->multiplier, multiplier,
>                              clk->divider, divider);
>      clk->multiplier = multiplier;
>      clk->divider = divider;
> +
> +    return true;
>  }
>  
>  static void clock_initfn(Object *obj)
> -- 
> 2.41.0
>