From 119e9db233ad0f4cbd4cfb9f9385a7bca378b37d Mon Sep 17 00:00:00 2001 From: Zeng Chi Date: Mon, 21 Sep 2026 18:24:42 +0800 Subject: KVM: Don't pre-reserve xarray entries when storing empty/NULL attributes Skip the xarray reservation loop when clearing all memory attributes, as storing NULL only erases the entry and never needs to allocate, so no reservation (and no cleanup of a failed one) is required in that case. Suggested-by: Sean Christopherson Cc: David Ballesteros Signed-off-by: Zeng Chi Link: https://patch.msgid.link/20260921102442.1232375-1-zeng_chi911@163.com [sean: split to separate patch] Signed-off-by: Sean Christopherson --- drivers/clk/sprd/gate.c | 135 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 135 insertions(+) create mode 100644 drivers/clk/sprd/gate.c (limited to 'drivers/clk/sprd/gate.c') diff --git a/drivers/clk/sprd/gate.c b/drivers/clk/sprd/gate.c new file mode 100644 index 000000000..56e1714b5 --- /dev/null +++ b/drivers/clk/sprd/gate.c @@ -0,0 +1,135 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Spreadtrum gate clock driver +// +// Copyright (C) 2017 Spreadtrum, Inc. +// Author: Chunyan Zhang + +#include +#include + +#include "gate.h" + +static void clk_gate_toggle(const struct sprd_gate *sg, bool en) +{ + const struct sprd_clk_common *common = &sg->common; + unsigned int reg; + bool set = sg->flags & CLK_GATE_SET_TO_DISABLE ? true : false; + + set ^= en; + + regmap_read(common->regmap, common->reg, ®); + + if (set) + reg |= sg->enable_mask; + else + reg &= ~sg->enable_mask; + + regmap_write(common->regmap, common->reg, reg); +} + +static void clk_sc_gate_toggle(const struct sprd_gate *sg, bool en) +{ + const struct sprd_clk_common *common = &sg->common; + bool set = sg->flags & CLK_GATE_SET_TO_DISABLE ? 1 : 0; + unsigned int offset; + + set ^= en; + + /* + * Each set/clear gate clock has three registers: + * common->reg - base register + * common->reg + offset - set register + * common->reg + 2 * offset - clear register + */ + offset = set ? sg->sc_offset : sg->sc_offset * 2; + + regmap_write(common->regmap, common->reg + offset, + sg->enable_mask); +} + +static void sprd_gate_disable(struct clk_hw *hw) +{ + struct sprd_gate *sg = hw_to_sprd_gate(hw); + + clk_gate_toggle(sg, false); +} + +static int sprd_gate_enable(struct clk_hw *hw) +{ + struct sprd_gate *sg = hw_to_sprd_gate(hw); + + clk_gate_toggle(sg, true); + + return 0; +} + +static void sprd_sc_gate_disable(struct clk_hw *hw) +{ + struct sprd_gate *sg = hw_to_sprd_gate(hw); + + clk_sc_gate_toggle(sg, false); +} + +static int sprd_sc_gate_enable(struct clk_hw *hw) +{ + struct sprd_gate *sg = hw_to_sprd_gate(hw); + + clk_sc_gate_toggle(sg, true); + + return 0; +} + +static int sprd_pll_sc_gate_prepare(struct clk_hw *hw) +{ + struct sprd_gate *sg = hw_to_sprd_gate(hw); + + clk_sc_gate_toggle(sg, true); + udelay(sg->udelay); + + return 0; +} + +static int sprd_gate_is_enabled(struct clk_hw *hw) +{ + struct sprd_gate *sg = hw_to_sprd_gate(hw); + struct sprd_clk_common *common = &sg->common; + struct clk_hw *parent; + unsigned int reg; + + if (sg->flags & SPRD_GATE_NON_AON) { + parent = clk_hw_get_parent(hw); + if (!parent || !clk_hw_is_enabled(parent)) + return 0; + } + + regmap_read(common->regmap, common->reg, ®); + + if (sg->flags & CLK_GATE_SET_TO_DISABLE) + reg ^= sg->enable_mask; + + reg &= sg->enable_mask; + + return reg ? 1 : 0; +} + +const struct clk_ops sprd_gate_ops = { + .disable = sprd_gate_disable, + .enable = sprd_gate_enable, + .is_enabled = sprd_gate_is_enabled, +}; +EXPORT_SYMBOL_GPL(sprd_gate_ops); + +const struct clk_ops sprd_sc_gate_ops = { + .disable = sprd_sc_gate_disable, + .enable = sprd_sc_gate_enable, + .is_enabled = sprd_gate_is_enabled, +}; +EXPORT_SYMBOL_GPL(sprd_sc_gate_ops); + +const struct clk_ops sprd_pll_sc_gate_ops = { + .unprepare = sprd_sc_gate_disable, + .prepare = sprd_pll_sc_gate_prepare, + .is_enabled = sprd_gate_is_enabled, +}; +EXPORT_SYMBOL_GPL(sprd_pll_sc_gate_ops); -- cgit v1.3.1