Re: [Qemu-devel] [PATCH] Fix obvious mistake in pxa2xx i2s driver

[Aurelien Jarno <aurelien@aurel32.net>]

On Mon, Feb 14, 2011 at 06:59:10PM +0200, Vasily Khoruzhick wrote:
> RST bit is (1 << 3) bit, not (1 << 2), fix condition
> that enables i2s if ENB is set and RST is not set.
> 
> Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
> ---
>  hw/pxa2xx.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/hw/pxa2xx.c b/hw/pxa2xx.c
> index d966846..68b67ae 100644
> --- a/hw/pxa2xx.c
> +++ b/hw/pxa2xx.c
> @@ -1631,7 +1631,7 @@ static void pxa2xx_i2s_write(void *opaque, target_phys_addr_t addr,
>          }
>          if (value & (1 << 4))				/* EFWR */
>              printf("%s: Attempt to use special function\n", __FUNCTION__);
> -        s->enable = ((value ^ 4) & 5) == 5;		/* ENB && !RST*/
> +        s->enable = ((value ^ (1 << 3)) & 9) == 9;		/* ENB && !RST*/
>          pxa2xx_i2s_update(s);
>          break;
>      case SACR1:

The fix looks fine, but the resulting code is probably over
engineered... What about:

         s->enable = (value & 9) == 1;

?

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net