Boris Brezillon [off-list ref] writes:

bcm2835_pll_divider_off() is resetting the divider field in the A2W reg
to zero when disabling the clock.

Make sure we preserve this value by reading the previous a2w_reg value
first and ORing the result with A2W_PLL_CHANNEL_DISABLE.

Signed-off-by: Boris Brezillon <redacted>
Fixes: 41691b8862e2 ("clk: bcm2835: Add support for programming the audio domain clocks")
Cc: <redacted>

Reviewed-by: Eric Anholt <redacted>
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