linux-kernel - [PATCH 0/2] regulator: Fix boot speed regression w/ off-on-delay-us

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Date:   Mon, 13 Mar 2023 11:18:18 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     mka@...omium.org, christian@...lschutter.com,
        Douglas Anderson <dianders@...omium.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 0/2] regulator: Fix boot speed regression w/ off-on-delay-us

These two patches together fix a boot speed regression on
sc7180-trogdor boards which use off-on-delay-us together with
regulator-boot-on with the eDP power rail.

The first patch is _almost_ a revert of another patch. Depending on
when the regulator is probed and the actual delay, the end result
might be the same as a revert or might result in a delay that's
somewhere between "no delay" and a full delay. As talked about in the
patch, I believe this is the correct behavior and, if the problems
fixed in the original patch are still present, I'm hoping that they
can be fixed in a cleaner way.

The first patch doesn't fully eliminate the boot speed regression, it
only gets us back ~250 of the 500 ms delay. The second patch gets us
the rest of the way.

The two patches can be applied independently of each other.

Douglas Anderson (2):
  regulator: core: Shorten off-on-delay-us for always-on/boot-on by time
    since booted
  regulator: fixed: Set PROBE_PREFER_ASYNCHRONOUS

 drivers/regulator/core.c  | 7 +++----
 drivers/regulator/fixed.c | 1 +
 2 files changed, 4 insertions(+), 4 deletions(-)

-- 
2.40.0.rc1.284.g88254d51c5-goog