Revert "clk: qcom: regmap-mux: add pipe clk implementation"

Johan Hovold has pointed out that there are several deficiencies and a
race condition in the regmap_mux_safe ops that were merged. Pipe clocks
has been updated to use newer and simpler clk_regmap_phy_mux_ops. Drop
the regmap-mux-safe clock ops now.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Tested-by: Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220521005343.1429642-4-dmitry.baryshkov@linaro.org

drivers/clk/qcom/clk-regmap-mux.c

@@ -49,87 +49,9 @@ static int mux_set_parent(struct clk_hw *hw, u8 index)
 	return regmap_update_bits(clkr->regmap, mux->reg, mask, val);
 }
 
-static u8 mux_safe_get_parent(struct clk_hw *hw)
-{
-	struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
-	unsigned int val;
-
-	if (clk_hw_is_enabled(hw))
-		return mux_get_parent(hw);
-
-	val = mux->stored_parent_cfg;
-
-	if (mux->parent_map)
-		return qcom_find_cfg_index(hw, mux->parent_map, val);
-
-	return val;
-}
-
-static int mux_safe_set_parent(struct clk_hw *hw, u8 index)
-{
-	struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
-
-	if (clk_hw_is_enabled(hw))
-		return mux_set_parent(hw, index);
-
-	if (mux->parent_map)
-		index = mux->parent_map[index].cfg;
-
-	mux->stored_parent_cfg = index;
-
-	return 0;
-}
-
-static void mux_safe_disable(struct clk_hw *hw)
-{
-	struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
-	struct clk_regmap *clkr = to_clk_regmap(hw);
-	unsigned int mask = GENMASK(mux->width + mux->shift - 1, mux->shift);
-	unsigned int val;
-
-	regmap_read(clkr->regmap, mux->reg, &val);
-
-	mux->stored_parent_cfg = (val & mask) >> mux->shift;
-
-	val = mux->safe_src_parent;
-	if (mux->parent_map) {
-		int index = qcom_find_src_index(hw, mux->parent_map, val);
-
-		if (WARN_ON(index < 0))
-			return;
-
-		val = mux->parent_map[index].cfg;
-	}
-	val <<= mux->shift;
-
-	regmap_update_bits(clkr->regmap, mux->reg, mask, val);
-}
-
-static int mux_safe_enable(struct clk_hw *hw)
-{
-	struct clk_regmap_mux *mux = to_clk_regmap_mux(hw);
-	struct clk_regmap *clkr = to_clk_regmap(hw);
-	unsigned int mask = GENMASK(mux->width + mux->shift - 1, mux->shift);
-	unsigned int val;
-
-	val = mux->stored_parent_cfg;
-	val <<= mux->shift;
-
-	return regmap_update_bits(clkr->regmap, mux->reg, mask, val);
-}
-
 const struct clk_ops clk_regmap_mux_closest_ops = {
 	.get_parent = mux_get_parent,
 	.set_parent = mux_set_parent,
 	.determine_rate = __clk_mux_determine_rate_closest,
 };
 EXPORT_SYMBOL_GPL(clk_regmap_mux_closest_ops);
-
-const struct clk_ops clk_regmap_mux_safe_ops = {
-	.enable = mux_safe_enable,
-	.disable = mux_safe_disable,
-	.get_parent = mux_safe_get_parent,
-	.set_parent = mux_safe_set_parent,
-	.determine_rate = __clk_mux_determine_rate_closest,
-};
-EXPORT_SYMBOL_GPL(clk_regmap_mux_safe_ops);

drivers/clk/qcom/clk-regmap-mux.h

@@ -14,13 +14,10 @@ struct clk_regmap_mux {
 	u32			reg;
 	u32			shift;
 	u32			width;
-	u8			safe_src_parent;
-	u8			stored_parent_cfg;
 	const struct parent_map	*parent_map;
 	struct clk_regmap	clkr;
 };
 
 extern const struct clk_ops clk_regmap_mux_closest_ops;
-extern const struct clk_ops clk_regmap_mux_safe_ops;
 
 #endif