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Re: [PATCH v3 6/6] bcma: Add flush for BCMA_RESET_CTL write

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On 05/05/2012 06:56 AM, Nathan Hintz wrote:
> Adds a missing read to flush the previous write (per the Broadcom SDK).
> 
> Signed-off-by: Nathan Hintz <nlhintz@xxxxxxxxxxx>
> ---
>  drivers/bcma/core.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/bcma/core.c b/drivers/bcma/core.c
> index 893f6e0..c4e6deb 100644
> --- a/drivers/bcma/core.c
> +++ b/drivers/bcma/core.c
> @@ -30,6 +30,7 @@ void bcma_core_disable(struct bcma_device *core, u32 flags)
>  	udelay(10);
>  
>  	bcma_awrite32(core, BCMA_RESET_CTL, BCMA_RESET_CTL_RESET);
> +	bcma_aread32(core, BCMA_RESET_CTL);
>  	udelay(1);
>  }
>  EXPORT_SYMBOL_GPL(bcma_core_disable);

Hi Nathan,

The read after write is only needed on (certain) SoCs. As bcma is not
being used just for these SoCs I suggest to make the flush conditional.
In brcmsmac we introduced "flushed write" function, which does the read
only for those SoCs.

Gr. AvS

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