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clk: imx: clk-scu: fix clk enable state save and restore

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[ Upstream commit e81361f6cf ]

The scu clk_ops only inplements prepare() and unprepare() callback.
Saving the clock state during suspend by checking clk_hw_is_enabled()
is not safe as it's possible that some device drivers may only
disable the clocks without unprepare. Then the state retention will not
work for such clocks.

Fixing it by checking clk_hw_is_prepared() which is more reasonable
and safe.

Fixes: d0409631f4 ("clk: imx: scu: add suspend/resume support")
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Tested-by: Carlos Song <carlos.song@nxp.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Link: https://lore.kernel.org/r/20241027-imx-clk-v1-v3-4-89152574d1d7@nxp.com
Signed-off-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Dong Aisheng
2024-10-27 20:00:10 +08:00
committed by Greg Kroah-Hartman
parent 882d94d746
commit 6786d623fb
1 changed files with 1 additions and 1 deletions
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drivers/clk/imx/clk-scu.c
+1 -1
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@@ -577,7 +577,7 @@ static int __maybe_unused imx_clk_scu_suspend(struct device *dev)
clk->rate = clk_scu_recalc_rate(&clk->hw, 0);
else
clk->rate = clk_hw_get_rate(&clk->hw);
clk->is_enabled = clk_hw_is_enabled(&clk->hw);
clk->is_enabled = clk_hw_is_prepared(&clk->hw);
if (clk->parent)
dev_dbg(dev, "save parent %s idx %u\n", clk_hw_get_name(clk->parent),