This is a note to let you know that I've just added the patch titled
clk: Honor CLK_OPS_PARENT_ENABLE in clk_core_is_enabled()
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
clk-honor-clk_ops_parent_enable-in-clk_core_is_enabl.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 170022c0d9340dde922745dc3759d66fb57521b6
Author: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>
Date: Tue Jan 3 17:23:30 2023 +0800
clk: Honor CLK_OPS_PARENT_ENABLE in clk_core_is_enabled()
[ Upstream commit 79200d5851c8e7179f68a4a6f162d8f1bde4986f ]
In the previous commits that added CLK_OPS_PARENT_ENABLE, support for
this flag was only added to rate change operations (rate setting and
reparent) and disabling unused subtree. It was not added to the
clock gate related operations. Any hardware driver that needs it for
these operations will either see bogus results, or worse, hang.
This has been seen on MT8192 and MT8195, where the imp_ii2_* clk
drivers set this, but dumping debugfs clk_summary would cause it
to hang.
Prepare parent on prepare and enable parent on enable dependencies are
already handled automatically by the core as part of its sequencing.
Whether the case for "enable parent on prepare" should be supported by
this flag or not is not clear, and thus ignored for now.
This change solely fixes the handling of clk_core_is_enabled, i.e.
enabling the parent clock when reading the hardware state. Unfortunately
clk_core_is_enabled is called in a variety of places, sometimes with
the enable clock already held. To avoid deadlocking, the core will
ignore readouts and just return false if CLK_OPS_PARENT_ENABLE is set
but the parent isn't currently enabled.
Fixes: fc8726a2c021 ("clk: core: support clocks which requires parents enable (part 2)")
Fixes: a4b3518d146f ("clk: core: support clocks which requires parents enable (part 1)")
Signed-off-by: Chen-Yu Tsai <wenst@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230103092330.494102-1-wenst@xxxxxxxxxxxx
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index b355d3d40f63a..3575afe16a574 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -251,6 +251,17 @@ static bool clk_core_is_enabled(struct clk_core *core)
}
}
+ /*
+ * This could be called with the enable lock held, or from atomic
+ * context. If the parent isn't enabled already, we can't do
+ * anything here. We can also assume this clock isn't enabled.
+ */
+ if ((core->flags & CLK_OPS_PARENT_ENABLE) && core->parent)
+ if (!clk_core_is_enabled(core->parent)) {
+ ret = false;
+ goto done;
+ }
+
ret = core->ops->is_enabled(core->hw);
done:
if (core->rpm_enabled)
