Commit eb601e47 authored by Boris Brezillon's avatar Boris Brezillon Committed by Luis Henriques

clk: at91: keep slow clk enabled to prevent system hang

commit dca1a4b5 upstream.

All slow clk users are not properly claiming it (get + prepare + enable)
before using it.
If all users properly claiming this clock release it, the clock is
disabled, but faulty users still depends on it, and the system hangs.

This fix prevents the slow clock from being disabled, and should solve the
hanging issue, but offending drivers should be patched to properly claim
this clock.
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
Reported-by: default avatarBo Shen <voice.shen@atmel.com>
Signed-off-by: default avatarMichael Turquette <mturquette@linaro.org>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 462dd2f9
......@@ -70,6 +70,7 @@ struct clk_sam9x5_slow {
#define to_clk_sam9x5_slow(hw) container_of(hw, struct clk_sam9x5_slow, hw)
static struct clk *slow_clk;
static int clk_slow_osc_prepare(struct clk_hw *hw)
{
......@@ -357,6 +358,8 @@ at91_clk_register_sam9x5_slow(void __iomem *sckcr,
clk = clk_register(NULL, &slowck->hw);
if (IS_ERR(clk))
kfree(slowck);
else
slow_clk = clk;
return clk;
}
......@@ -433,6 +436,8 @@ at91_clk_register_sam9260_slow(struct at91_pmc *pmc,
clk = clk_register(NULL, &slowck->hw);
if (IS_ERR(clk))
kfree(slowck);
else
slow_clk = clk;
return clk;
}
......@@ -465,3 +470,25 @@ void __init of_at91sam9260_clk_slow_setup(struct device_node *np,
of_clk_add_provider(np, of_clk_src_simple_get, clk);
}
/*
* FIXME: All slow clk users are not properly claiming it (get + prepare +
* enable) before using it.
* If all users properly claiming this clock decide that they don't need it
* anymore (or are removed), it is disabled while faulty users are still
* requiring it, and the system hangs.
* Prevent this clock from being disabled until all users are properly
* requesting it.
* Once this is done we should remove this function and the slow_clk variable.
*/
static int __init of_at91_clk_slow_retain(void)
{
if (!slow_clk)
return 0;
__clk_get(slow_clk);
clk_prepare_enable(slow_clk);
return 0;
}
arch_initcall(of_at91_clk_slow_retain);
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