2019-09-19 14:43:19 +00:00
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From 6272fd1e55945522b156a28c1f605b69ae6e05b7 Mon Sep 17 00:00:00 2001
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2019-07-09 18:32:28 +00:00
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From: Eric Anholt <eric@anholt.net>
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Date: Mon, 9 May 2016 17:28:18 -0700
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2019-12-23 12:42:55 +00:00
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Subject: [PATCH] clk: bcm2835: Mark GPIO clocks enabled at boot as
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2019-07-09 18:32:28 +00:00
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critical.
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These divide off of PLLD_PER and are used for the ethernet and wifi
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PHYs source PLLs. Neither of them is currently represented by a phy
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device that would grab the clock for us.
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This keeps other drivers from killing the networking PHYs when they
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disable their own clocks and trigger PLLD_PER's refcount going to 0.
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v2: Skip marking as critical if they aren't on at boot.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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---
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drivers/clk/bcm/clk-bcm2835.c | 9 +++++++++
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1 file changed, 9 insertions(+)
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--- a/drivers/clk/bcm/clk-bcm2835.c
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+++ b/drivers/clk/bcm/clk-bcm2835.c
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@@ -1454,6 +1454,15 @@ static struct clk_hw *bcm2835_register_c
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init.flags = data->flags | CLK_IGNORE_UNUSED;
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/*
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+ * Some GPIO clocks for ethernet/wifi PLLs are marked as
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+ * critical (since some platforms use them), but if the
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+ * firmware didn't have them turned on then they clearly
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+ * aren't actually critical.
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+ */
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+ if ((cprman_read(cprman, data->ctl_reg) & CM_ENABLE) == 0)
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+ init.flags &= ~CLK_IS_CRITICAL;
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+
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+ /*
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* Pass the CLK_SET_RATE_PARENT flag if we are allowed to propagate
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* rate changes on at least of the parents.
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*/
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