Hi Vinod,

On 20 June 2018 at 11:02, Vinod [off-list ref] wrote:

On 19-06-18, 22:28, Herbert Xu wrote:

quoted

On Mon, Jun 18, 2018 at 07:42:59PM +0530, Vinod Koul wrote:

quoted

Qcom 8996 and later chips support prng v2 where we need to only
implement .read callback for hwrng.

Add a new table for v2 which supports this and get version required for
driver data.

Signed-off-by: Vinod Koul <vkoul@kernel.org>

Is this really a pseudo-RNG? If so it needs to be moved over to
the algif_rng interface.

hwrng is for true hardware RNGs only, because it may be directly
fed into /dev/random.

I am trying to find how how much random output this hardware generates.

Meanwhile, can you please point out examples/Documentation for algif_rng
and if any test tools for this?

As Herbert suggested exynos rng is a good example. It was wrongly
using hwrng framework then switched to using crypto framework.

I have a patch for msm rng using crypto framework, only compile tested
though. You can find the patch at
https://pastebin.ubuntu.com/p/44r6BJgBkN/. I am having a hard time
sending patches via git send-email form a gmail account so I have put
it in pastebin. Feel free to use it if that is useful.

Regards,
PrasannaKumar