clk: bcm2835: Skip PLLC clocks when deciding on a new clock parent

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If the firmware had set up a clock to source from PLLC, go along with
it.  But if we're looking for a new parent, we don't want to switch it
to PLLC because the firmware will force PLLC (and thus the AXI bus
clock) to different frequencies during over-temp/under-voltage,
without notification to Linux.

On my system, this moves the Linux-enabled HDMI state machine and DSI1
escape clock over to plld_per from pllc_per.  EMMC still ends up on
pllc_per, because the firmware had set it up to use that.

Signed-off-by: Eric Anholt <eric@anholt.net>
Fixes: 41691b8862 ("clk: bcm2835: Add support for programming the audio domain clocks")
Acked-by: Martin Sperl <kernel@martin.sperl.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

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Eric Anholt 2016-06-01 12:05:36 -07:00 • committed by Stephen Boyd

parent 9e400c5cc5

commit 67615c588a

1 changed files with 23 additions and 0 deletions

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drivers/clk/bcm/clk-bcm2835.c

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