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[212.171.11.30]) by smtp.googlemail.com with ESMTPSA id ffacd0b85a97d-498363df7a5sm1704703f8f.37.2026.11.09.16.08.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Nov 2026 16:08:10 -0800 (PST) From: Christian Marangi To: Stephen Boyd , Brian Masney , Jerome Brunet , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Philipp Zabel , Felix Fietkau , linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Christian Marangi Subject: [PATCH v12 3/5] clk: en7523: protect concurrent access to reset and PCI register Date: Tue, 10 Nov 2026 01:07:48 +0100 Message-ID: <20261110000753.508-4-ansuelsmth@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261110000753.508-1-ansuelsmth@gmail.com> References: <20261110000753.508-1-ansuelsmth@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Use spinlock for concurrent access to reset and PCI register to catch case when clock is enabled/disabled while a reset is also operated at the same time. Some minor rework was needed for PCI unprepare case to permit calling it before clk_hw_register and reference the global spinlock. Signed-off-by: Christian Marangi --- drivers/clk/clk-en7523.c | 101 ++++++++++++++++++++++++++++++++++++--- 1 file changed, 95 insertions(+), 6 deletions(-) diff --git a/drivers/clk/clk-en7523.c b/drivers/clk/clk-en7523.c index 2baec734df9f..fbe10e4c3693 100644 --- a/drivers/clk/clk-en7523.c +++ b/drivers/clk/clk-en7523.c @@ -150,6 +150,7 @@ struct en_clk_soc_data { const struct clk_ops pcie_ops; int (*hw_init)(struct platform_device *pdev, struct clk_hw_onecell_data *clk_data); + void (*pci_unprepare)(struct device *dev, struct en_clk_gate *cg); }; static const u32 gsw_base[] = { 400000000, 500000000 }; @@ -577,58 +578,112 @@ static u32 en7523_get_div(const struct en_clk_desc *desc, u32 val) static int en7523_pci_is_enabled(struct clk_hw *hw) { struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw); + struct device *dev = clk_hw_get_dev(hw); + struct en_clk_priv *priv; + unsigned long flags; + u32 val; + + priv = dev_get_drvdata(dev); + + spin_lock_irqsave(&priv->lock, flags); + val = readl(cg->base + REG_PCI_CONTROL); + spin_unlock_irqrestore(&priv->lock, flags); - return !!(readl(cg->base + REG_PCI_CONTROL) & REG_PCI_CONTROL_REFCLK_EN1); + return !!(val & REG_PCI_CONTROL_REFCLK_EN1); } static int en7523_pci_prepare(struct clk_hw *hw) { struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw); + struct device *dev = clk_hw_get_dev(hw); void __iomem *np_base = cg->base; + struct en_clk_priv *priv; + unsigned long flags; u32 val, mask; + priv = dev_get_drvdata(dev); + /* Need to pull device low before reset */ + spin_lock_irqsave(&priv->lock, flags); val = readl(np_base + REG_PCI_CONTROL); val &= ~(REG_PCI_CONTROL_PERSTOUT1 | REG_PCI_CONTROL_PERSTOUT); writel(val, np_base + REG_PCI_CONTROL); + spin_unlock_irqrestore(&priv->lock, flags); + usleep_range(1000, 2000); /* Enable PCIe port 1 */ + spin_lock_irqsave(&priv->lock, flags); + val = readl(np_base + REG_PCI_CONTROL); val |= REG_PCI_CONTROL_REFCLK_EN1; writel(val, np_base + REG_PCI_CONTROL); + spin_unlock_irqrestore(&priv->lock, flags); + usleep_range(1000, 2000); /* Reset to default */ + spin_lock_irqsave(&priv->lock, flags); val = readl(np_base + REG_RESET_CONTROL1); mask = REG_RESET_CONTROL_PCIE1 | REG_RESET_CONTROL_PCIE2 | REG_RESET_CONTROL_PCIEHB; writel(val & ~mask, np_base + REG_RESET_CONTROL1); + spin_unlock_irqrestore(&priv->lock, flags); + usleep_range(1000, 2000); + + spin_lock_irqsave(&priv->lock, flags); + val = readl(np_base + REG_RESET_CONTROL1); writel(val | mask, np_base + REG_RESET_CONTROL1); + spin_unlock_irqrestore(&priv->lock, flags); + msleep(100); + + spin_lock_irqsave(&priv->lock, flags); + val = readl(np_base + REG_RESET_CONTROL1); writel(val & ~mask, np_base + REG_RESET_CONTROL1); + spin_unlock_irqrestore(&priv->lock, flags); + usleep_range(5000, 10000); /* Release device */ - mask = REG_PCI_CONTROL_PERSTOUT1 | REG_PCI_CONTROL_PERSTOUT; + spin_lock_irqsave(&priv->lock, flags); val = readl(np_base + REG_PCI_CONTROL); + mask = REG_PCI_CONTROL_PERSTOUT1 | REG_PCI_CONTROL_PERSTOUT; writel(val & ~mask, np_base + REG_PCI_CONTROL); + spin_unlock_irqrestore(&priv->lock, flags); + usleep_range(1000, 2000); + + spin_lock_irqsave(&priv->lock, flags); + val = readl(np_base + REG_PCI_CONTROL); writel(val | mask, np_base + REG_PCI_CONTROL); + spin_unlock_irqrestore(&priv->lock, flags); + msleep(250); return 0; } -static void en7523_pci_unprepare(struct clk_hw *hw) +static void __en7523_pci_unprepare(struct device *dev, struct en_clk_gate *cg) { - struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw); + struct en_clk_priv *priv = dev_get_drvdata(dev); void __iomem *np_base = cg->base; + unsigned long flags; u32 val; + spin_lock_irqsave(&priv->lock, flags); val = readl(np_base + REG_PCI_CONTROL); val &= ~REG_PCI_CONTROL_REFCLK_EN1; writel(val, np_base + REG_PCI_CONTROL); + spin_unlock_irqrestore(&priv->lock, flags); +} + +static void en7523_pci_unprepare(struct clk_hw *hw) +{ + struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw); + struct device *dev = clk_hw_get_dev(hw); + + __en7523_pci_unprepare(dev, cg); } static struct clk_hw *en7523_register_pcie_clk(struct device *dev, @@ -648,8 +703,8 @@ static struct clk_hw *en7523_register_pcie_clk(struct device *dev, cg->base = np_base; cg->hw.init = &init; - if (init.ops->unprepare) - init.ops->unprepare(&cg->hw); + if (soc_data->pci_unprepare) + soc_data->pci_unprepare(dev, cg); if (devm_clk_hw_register(dev, &cg->hw)) return NULL; @@ -660,22 +715,37 @@ static struct clk_hw *en7523_register_pcie_clk(struct device *dev, static int en7581_pci_is_enabled(struct clk_hw *hw) { struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw); + struct device *dev = clk_hw_get_dev(hw); + struct en_clk_priv *priv; + unsigned long flags; u32 val, mask; + priv = dev_get_drvdata(dev); mask = REG_PCI_CONTROL_REFCLK_EN0 | REG_PCI_CONTROL_REFCLK_EN1; + + spin_lock_irqsave(&priv->lock, flags); val = readl(cg->base + REG_PCI_CONTROL); + spin_unlock_irqrestore(&priv->lock, flags); + return (val & mask) == mask; } static int en7581_pci_enable(struct clk_hw *hw) { struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw); + struct device *dev = clk_hw_get_dev(hw); void __iomem *np_base = cg->base; + struct en_clk_priv *priv; + unsigned long flags; u32 val, mask; + priv = dev_get_drvdata(dev); mask = REG_PCI_CONTROL_REFCLK_EN0 | REG_PCI_CONTROL_REFCLK_EN1; + + spin_lock_irqsave(&priv->lock, flags); val = readl(np_base + REG_PCI_CONTROL); writel(val | mask, np_base + REG_PCI_CONTROL); + spin_unlock_irqrestore(&priv->lock, flags); return 0; } @@ -683,12 +753,20 @@ static int en7581_pci_enable(struct clk_hw *hw) static void en7581_pci_disable(struct clk_hw *hw) { struct en_clk_gate *cg = container_of(hw, struct en_clk_gate, hw); + struct device *dev = clk_hw_get_dev(hw); void __iomem *np_base = cg->base; + struct en_clk_priv *priv; + unsigned long flags; u32 val, mask; + priv = dev_get_drvdata(dev); mask = REG_PCI_CONTROL_REFCLK_EN0 | REG_PCI_CONTROL_REFCLK_EN1; + + spin_lock_irqsave(&priv->lock, flags); val = readl(np_base + REG_PCI_CONTROL); writel(val & ~mask, np_base + REG_PCI_CONTROL); + spin_unlock_irqrestore(&priv->lock, flags); + usleep_range(1000, 2000); } @@ -788,21 +866,25 @@ static int en7523_reset_update(struct reset_controller_dev *rcdev, unsigned long id, bool assert) { struct en_rst_data *rst_data = container_of(rcdev, struct en_rst_data, rcdev); + struct en_clk_priv *priv = dev_get_drvdata(rcdev->dev); u32 offset = rst_data->bank_ofs[id / RST_NR_PER_BANK]; void __iomem *addr = rst_data->base + offset; bool inverted = false; + unsigned long flags; u32 val; /* For PCIC reset logic is inverted, 0:assert 1:deassert */ if (offset == REG_NP_SCU_PCIC) inverted = true; + spin_lock_irqsave(&priv->lock, flags); val = readl(addr); if (assert ^ inverted) val |= BIT(id % RST_NR_PER_BANK); else val &= ~BIT(id % RST_NR_PER_BANK); writel(val, addr); + spin_unlock_irqrestore(&priv->lock, flags); return 0; } @@ -823,16 +905,21 @@ static int en7523_reset_status(struct reset_controller_dev *rcdev, unsigned long id) { struct en_rst_data *rst_data = container_of(rcdev, struct en_rst_data, rcdev); + struct en_clk_priv *priv = dev_get_drvdata(rcdev->dev); u32 offset = rst_data->bank_ofs[id / RST_NR_PER_BANK]; void __iomem *addr = rst_data->base + offset; bool inverted = false; + unsigned long flags; u32 val; /* For PCIC reset logic is inverted, 0:assert 1:deassert */ if (offset == REG_NP_SCU_PCIC) inverted = true; + spin_lock_irqsave(&priv->lock, flags); val = readl(addr) & BIT(id % RST_NR_PER_BANK); + spin_unlock_irqrestore(&priv->lock, flags); + return inverted ? !val : !!val; } @@ -1223,6 +1310,7 @@ static const struct en_clk_soc_data en7523_data = { .unprepare = en7523_pci_unprepare, }, .hw_init = en7523_clk_hw_init, + .pci_unprepare = __en7523_pci_unprepare, }; static const struct en_clk_soc_data en7581_data = { @@ -1244,6 +1332,7 @@ static const struct en_clk_soc_data en751221_data = { .unprepare = en7523_pci_unprepare, }, .hw_init = en751221_clk_hw_init, + .pci_unprepare = __en7523_pci_unprepare, }; static const struct of_device_id of_match_clk_en7523[] = { -- 2.55.0