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    SubjectApplied "regmap: add iopoll-like polling macro for regmap_field" to the regmap tree
    Date
    The patch

    regmap: add iopoll-like polling macro for regmap_field

    has been applied to the regmap tree at

    git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap.git

    All being well this means that it will be integrated into the linux-next
    tree (usually sometime in the next 24 hours) and sent to Linus during
    the next merge window (or sooner if it is a bug fix), however if
    problems are discovered then the patch may be dropped or reverted.

    You may get further e-mails resulting from automated or manual testing
    and review of the tree, please engage with people reporting problems and
    send followup patches addressing any issues that are reported if needed.

    If any updates are required or you are submitting further changes they
    should be sent as incremental updates against current git, existing
    patches will not be replaced.

    Please add any relevant lists and maintainers to the CCs when replying
    to this mail.

    Thanks,
    Mark

    From 667063acb81931e2f8fd0cb91df9fcccad131d9a Mon Sep 17 00:00:00 2001
    From: Chen-Yu Tsai <wens@csie.org>
    Date: Fri, 29 Sep 2017 16:23:01 +0800
    Subject: [PATCH] regmap: add iopoll-like polling macro for regmap_field

    This patch adds a macro regmap_field_read_poll_timeout that works
    similar to the readx_poll_timeout defined in linux/iopoll.h, except
    that this can also return the error value returned by a failed
    regmap_field_read.

    Signed-off-by: Chen-Yu Tsai <wens@csie.org>
    Signed-off-by: Mark Brown <broonie@kernel.org>
    ---
    include/linux/regmap.h | 39 +++++++++++++++++++++++++++++++++++++++
    1 file changed, 39 insertions(+)

    diff --git a/include/linux/regmap.h b/include/linux/regmap.h
    index 978abfbac617..93a4663d7acb 100644
    --- a/include/linux/regmap.h
    +++ b/include/linux/regmap.h
    @@ -139,6 +139,45 @@ struct reg_sequence {
    pollret ?: ((cond) ? 0 : -ETIMEDOUT); \
    })

    +/**
    + * regmap_field_read_poll_timeout - Poll until a condition is met or timeout
    + *
    + * @field: Regmap field to read from
    + * @val: Unsigned integer variable to read the value into
    + * @cond: Break condition (usually involving @val)
    + * @sleep_us: Maximum time to sleep between reads in us (0
    + * tight-loops). Should be less than ~20ms since usleep_range
    + * is used (see Documentation/timers/timers-howto.txt).
    + * @timeout_us: Timeout in us, 0 means never timeout
    + *
    + * Returns 0 on success and -ETIMEDOUT upon a timeout or the regmap_field_read
    + * error return value in case of a error read. In the two former cases,
    + * the last read value at @addr is stored in @val. Must not be called
    + * from atomic context if sleep_us or timeout_us are used.
    + *
    + * This is modelled after the readx_poll_timeout macros in linux/iopoll.h.
    + */
    +#define regmap_field_read_poll_timeout(field, val, cond, sleep_us, timeout_us) \
    +({ \
    + ktime_t timeout = ktime_add_us(ktime_get(), timeout_us); \
    + int pollret; \
    + might_sleep_if(sleep_us); \
    + for (;;) { \
    + pollret = regmap_field_read((field), &(val)); \
    + if (pollret) \
    + break; \
    + if (cond) \
    + break; \
    + if (timeout_us && ktime_compare(ktime_get(), timeout) > 0) { \
    + pollret = regmap_field_read((field), &(val)); \
    + break; \
    + } \
    + if (sleep_us) \
    + usleep_range((sleep_us >> 2) + 1, sleep_us); \
    + } \
    + pollret ?: ((cond) ? 0 : -ETIMEDOUT); \
    +})
    +
    #ifdef CONFIG_REGMAP

    enum regmap_endian {
    --
    2.14.1
    \
     
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