[PATCH 5.4 37/88] clk: qcom: regmap-mux: fix parent clock lookup
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2021-12-13 10:17:52
Also in:
lkml
From: Dmitry Baryshkov <redacted>
commit 9a61f813fcc8d56d85fcf9ca6119cf2b5ac91dd5 upstream.
The function mux_get_parent() uses qcom_find_src_index() to find the
parent clock index, which is incorrect: qcom_find_src_index() uses src
enum for the lookup, while mux_get_parent() should use cfg field (which
corresponds to the register value). Add qcom_find_cfg_index() function
doing this kind of lookup and use it for mux parent lookup.
Fixes: df964016490b ("clk: qcom: add parent map for regmap mux")
Cc: stable@vger.kernel.org
Signed-off-by: Dmitry Baryshkov <redacted>
Link: https://lore.kernel.org/r/20211115233407.1046179-1-dmitry.baryshkov@linaro.org (local)
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/clk/qcom/clk-regmap-mux.c | 2 +-
drivers/clk/qcom/common.c | 12 ++++++++++++
drivers/clk/qcom/common.h | 2 ++
3 files changed, 15 insertions(+), 1 deletion(-)
--- a/drivers/clk/qcom/clk-regmap-mux.c
+++ b/drivers/clk/qcom/clk-regmap-mux.c@@ -28,7 +28,7 @@ static u8 mux_get_parent(struct clk_hw * val &= mask; if (mux->parent_map) - return qcom_find_src_index(hw, mux->parent_map, val); + return qcom_find_cfg_index(hw, mux->parent_map, val); return val; } --- a/drivers/clk/qcom/common.c +++ b/drivers/clk/qcom/common.c
@@ -69,6 +69,18 @@ int qcom_find_src_index(struct clk_hw *h } EXPORT_SYMBOL_GPL(qcom_find_src_index); +int qcom_find_cfg_index(struct clk_hw *hw, const struct parent_map *map, u8 cfg) +{ + int i, num_parents = clk_hw_get_num_parents(hw); + + for (i = 0; i < num_parents; i++) + if (cfg == map[i].cfg) + return i; + + return -ENOENT; +} +EXPORT_SYMBOL_GPL(qcom_find_cfg_index); + struct regmap * qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc) { --- a/drivers/clk/qcom/common.h +++ b/drivers/clk/qcom/common.h
@@ -49,6 +49,8 @@ extern void qcom_pll_set_fsm_mode(struct regmap *m, u32 reg, u8 bias_count, u8 lock_count); extern int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src); +extern int qcom_find_cfg_index(struct clk_hw *hw, const struct parent_map *map, + u8 cfg); extern int qcom_cc_register_board_clk(struct device *dev, const char *path, const char *name, unsigned long rate);