clk: qcom: clk-alpha-pll: Don't reconfigure running Trion
Bjorn Andersson authored
In the event that the bootloader has configured the Trion PLL as source
for the display clocks, e.g. for the continuous splashscreen, then there
will also be RCGs that are clocked by this instance.

Reconfiguring, and in particular disabling the output of, the PLL will
cause issues for these downstream RCGs and has been shown to prevent
them from being re-parented.

Follow downstream and skip configuration if it's determined that the PLL
is already running.

Fixes: 59128c20

 ("clk: qcom: clk-alpha-pll: Add support for controlling Lucid PLLs")
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: default avatarRobert Foss <robert.foss@linaro.org>
Reviewed-by: default avatarVinod Koul <vkoul@kernel.org>
Link: https://lore.kernel.org/r/20211123162508.153711-1-bjorn.andersson@linaro.org

Signed-off-by: default avatarStephen Boyd <sboyd@kernel.org>
a1f0019c
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Documentation Merge tag 'devicetree-fixes-for-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
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arch Merge tag 'for-5.16/parisc-3' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux
block blk-mq: fix filesystem I/O request allocation
certs certs: Add support for using elliptic curve keys for signing modules
crypto Merge tag 'zstd-for-linus-v5.16' of git://github.com/terrelln/linux
drivers clk: qcom: clk-alpha-pll: Don't reconfigure running Trion
fs Merge tag 'xfs-5.16-merge-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
include Merge tag 'devicetree-fixes-for-5.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
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tools Merge tag 'locking-urgent-2021-11-14' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
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