Re: [PATCH 8/8] dmaengine/dw_dmac: Add support for DMA_SLAVE_CONFIG

[Jassi Brar]

On 16 January 2012 17:12, Viresh Kumar <viresh.kumar@xxxxxx> wrote:
> On 1/16/2012 3:20 PM, Viresh KUMAR wrote:
>> +     /*
>> +      * Fix sconfig's burst size according to dw_dmac. We need to convert
>> +      * them as: 1 -> 0, 2 -> 1, 4 -> 2, 8 -> 3, 16 -> 4.
>> +      *
>> +      * This can be done by findiding least significant bit set: n & (n - 1)
>> +      */
>> +     sconfig->src_maxburst &= sconfig->src_maxburst - 1;
>> +     sconfig->dst_maxburst &= sconfig->dst_maxburst - 1;
>
> Perhaps, this looks incorrect. It will always return 0. :(
> Can somebody suggest any inbuild function to do this, i think
>
Calculating log2(n) which isn't very tidy. For that reason usually we make do
the other way around by saving values as power of 2 and simply left shifting
1 by that value.
In case at hand since most likely only valid values are power of 2,
maybe you can do
    maxburst = ffs(maxburst) - 1

-j
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/