miaoqing@xxxxxxxxxxxxxx writes:
> From: Miaoqing Pan <miaoqing@xxxxxxxxxxxxxx>
>
> This patch is derived from
> commit 6301566e0b2d ("ath9k: export HW random number generator"),
>
> We evaluated the entropy of the ADC data on QCA9531, QCA9561, QCA955x,
> and AR9340, and it has sufficient quality random data (at least 10 bits
> and up to 22 bits of min-entropy for a 32-bit value). We conservatively
> assume the min-entropy is 10 bits out of 32 bits. Thus, ATH9K_RNG_BUF_SIZE
> is set to 320 (u32) i.e., 1.25 kilobytes of data is inserted to fill up
> the pool as soon as the entropy counter becomes 896/4096 (set by random.c).
> Since ADC was not designed to be a dedicated HW RNG, we do not want to bind
> it to /dev/hwrng framework directly. This patch feeds the entropy directly
> from the WiFi driver to the input pool. The ADC register output is only
> used as a seed for the Linux entropy pool. No conditioning is needed,
> since all the conditioning is performed by the pool itself.
>
> Signed-off-by: Miaoqing Pan <miaoqing@xxxxxxxxxxxxxx>
Applied to ath.git, thanks.
--
Kalle Valo
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