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authorBoris Brezillon <boris.brezillon@free-electrons.com>2015-01-13 15:44:06 +0100
committerMichael Turquette <mturquette@linaro.org>2015-01-13 10:54:01 -0800
commitdca1a4b5ff6e2c25adeff366eb06270dadeab3db (patch)
treefd13bbae56ec37b25b968ed7f49b2002cd7f72ae
parent98f87a7ba278e6b9064b8022728c9c14ed467ebe (diff)
clk: at91: keep slow clk enabled to prevent system hang
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: Boris Brezillon <boris.brezillon@free-electrons.com> Reported-by: Bo Shen <voice.shen@atmel.com> Cc: stable@vger.kernel.org Signed-off-by: Michael Turquette <mturquette@linaro.org>
-rw-r--r--drivers/clk/at91/clk-slow.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/clk/at91/clk-slow.c b/drivers/clk/at91/clk-slow.c
index 32f7c1b36204..2f13bd5246b5 100644
--- a/drivers/clk/at91/clk-slow.c
+++ b/drivers/clk/at91/clk-slow.c
@@ -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);