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    Subject[PATCH v2 0/4] Assorted changes for Exynos PRNG driver
    Date
    Hello,

    This is a series of patches for exynos-rng driver I've decided to
    create after adding support for Exynos5250+ chips. They do not
    strictly depend on each other, but I think it is better to send them
    as a single patch-set.

    The driver requires appropriate DT configuration introduced in

    https://patchwork.kernel.org/patch/10104445/

    Patch #1 Add support for PRNG in Exynos5250+ SoCs

    Patch #2 Improve output performance by using memcpy() rather than a
    custom function to retrieve random bytes from registers. Rearrange
    the loop for polling the hardware.

    Patch #3 Reseed the PRNG after reading 2^16 bytes. Simmilar approach
    is implemented in DRBG. (Thanks Stephan Mueller)

    Patch #4 Introduce locking to prevent simultaneous access to the
    hardware from more than one thread/process.

    Changes since v1:

    - Added Patch #4.
    - Extended commit message for patch #3.
    - Changed exynos_prng_type enum and a define according to Krzysztof Kozłowski's
    recommendations.
    - Brought back cpu_relax() in a rearranged loop in
    exynos_rng_get_random().
    - Moved an assignment of the read valuea away from an error path.
    - Removed dev_info() reporting hardware presence from
    exynos_rng_probe().

    Łukasz Stelmach (4):
    crypto: exynos - Support Exynos5250+ SoCs
    crypto: exynos - Improve performance of PRNG
    crypto: exynos - Reseed PRNG after generating 2^16 random bytes
    crypto: exynos - Introduce mutex to prevent concurrent access to
    hardware

    .../bindings/crypto/samsung,exynos-rng4.txt | 4 +-
    drivers/crypto/exynos-rng.c | 104 +++++++++++++--------
    2 files changed, 70 insertions(+), 38 deletions(-)

    --
    2.11.0

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