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author | Jerome Brunet <jbrunet@baylibre.com> | 2018-06-19 15:40:51 +0200 |
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committer | Michael Turquette <mturquette@baylibre.com> | 2018-06-19 19:03:38 +0200 |
commit | 9461f7b33d11cbbf5ce79c3c03d0da9d42dfce92 (patch) | |
tree | 5a595804ecd64012231e6304739ff7205ce80f27 /drivers/spmi | |
parent | Linux 4.18-rc1 (diff) | |
download | linux-9461f7b33d11cbbf5ce79c3c03d0da9d42dfce92.tar.xz linux-9461f7b33d11cbbf5ce79c3c03d0da9d42dfce92.zip |
clk: fix CLK_SET_RATE_GATE with clock rate protection
CLK_SET_RATE_GATE should prevent any operation which may result in a rate
change or glitch while the clock is prepared/enabled.
IOW, the following sequence is not allowed anymore with CLK_SET_RATE_GATE:
* clk_get()
* clk_prepare_enable()
* clk_get_rate()
* clk_set_rate()
At the moment this is enforced on the leaf clock of the operation, not
along the tree. This problematic because, if a PLL has the CLK_RATE_GATE,
it won't be enforced if the clk_set_rate() is called on its child clocks.
Using clock rate protection, we can now enforce CLK_SET_RATE_GATE along the
clock tree
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Quentin Schulz <quentin.schulz@free-electrons.com>
Tested-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Michael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/20180619134051.16726-3-jbrunet@baylibre.com
Diffstat (limited to 'drivers/spmi')
0 files changed, 0 insertions, 0 deletions