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clk: tegra: Fix disable unused for clocks sharing enable bit

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In case 2 clocks share an enable bit and one of them is enabled by a
driver and the other one is not, CCF will think it's enabled because it
will only look at the HW state. Therefore it will disable the clock and
thus also disable the other clock which was enabled. Solve this by
reading the initial state of the enable bit and incrementing the
refcount if it's set.

Signed-off-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Peter De Schrijver 2017-03-02 15:22:05 +02:00 committed by Thierry Reding
parent 3843832fc8
commit 9619dba832
1 changed files with 3 additions and 0 deletions
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drivers/clk/tegra/clk-periph-gate.c
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@ -159,6 +159,9 @@ struct clk *tegra_clk_register_periph_gate(const char *name,
gate->enable_refcnt = enable_refcnt;
gate->regs = pregs;
if (read_enb(gate) & periph_clk_to_bit(gate))
enable_refcnt[clk_num]++;
/* Data in .init is copied by clk_register(), so stack variable OK */
gate->hw.init = &init;