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phy: ti-pipe3: fix suspend
Relying on PM-ops for shutting down PHY clocks was a bad idea since the users (e.g. PCIe/SATA) might not have been suspended by then. The main culprit for not shutting down the clocks was the stray pm_runtime_get() call in probe. Fix the whole thing in the right way by getting rid of that pm_runtime_get() call from probe and removing all PM-ops. It is the sole responsibility of the PHY user to properly turn OFF and de-initialize the PHY as part of its suspend routine. As PHY core serializes init/exit we don't need to use a spinlock in this driver. So get rid of it. Signed-off-by: Roger Quadros <rogerq@ti.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Roger Quadros
Kishon Vijay Abraham I
parent
d770e558e2
commit
0a0830feb2
@ -28,7 +28,6 @@
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#include <linux/delay.h>
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#include <linux/phy/omap_control_phy.h>
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#include <linux/of_platform.h>
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#include <linux/spinlock.h>
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#define PLL_STATUS 0x00000004
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#define PLL_GO 0x00000008
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@ -83,10 +82,6 @@ struct ti_pipe3 {
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struct clk *refclk;
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struct clk *div_clk;
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struct pipe3_dpll_map *dpll_map;
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bool enabled;
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spinlock_t lock; /* serialize clock enable/disable */
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/* the below flag is needed specifically for SATA */
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bool refclk_enabled;
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};
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static struct pipe3_dpll_map dpll_map_usb[] = {
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@ -137,6 +132,9 @@ static struct pipe3_dpll_params *ti_pipe3_get_dpll_params(struct ti_pipe3 *phy)
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return NULL;
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}
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static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy);
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static void ti_pipe3_disable_clocks(struct ti_pipe3 *phy);
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static int ti_pipe3_power_off(struct phy *x)
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{
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struct ti_pipe3 *phy = phy_get_drvdata(x);
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@ -217,6 +215,7 @@ static int ti_pipe3_init(struct phy *x)
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u32 val;
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int ret = 0;
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ti_pipe3_enable_clocks(phy);
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/*
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* Set pcie_pcs register to 0x96 for proper functioning of phy
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* as recommended in AM572x TRM SPRUHZ6, section 18.5.2.2, table
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@ -250,33 +249,35 @@ static int ti_pipe3_exit(struct phy *x)
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u32 val;
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unsigned long timeout;
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/* SATA DPLL can't be powered down due to Errata i783 and PCIe
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* does not have internal DPLL
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*/
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if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata") ||
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of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie"))
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/* SATA DPLL can't be powered down due to Errata i783 */
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if (of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata"))
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return 0;
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/* Put DPLL in IDLE mode */
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val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
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val |= PLL_IDLE;
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ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val);
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/* PCIe doesn't have internal DPLL */
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if (!of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-pcie")) {
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/* Put DPLL in IDLE mode */
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val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_CONFIGURATION2);
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val |= PLL_IDLE;
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ti_pipe3_writel(phy->pll_ctrl_base, PLL_CONFIGURATION2, val);
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/* wait for LDO and Oscillator to power down */
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timeout = jiffies + msecs_to_jiffies(PLL_IDLE_TIME);
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do {
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cpu_relax();
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val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_STATUS);
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if ((val & PLL_TICOPWDN) && (val & PLL_LDOPWDN))
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break;
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} while (!time_after(jiffies, timeout));
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/* wait for LDO and Oscillator to power down */
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timeout = jiffies + msecs_to_jiffies(PLL_IDLE_TIME);
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do {
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cpu_relax();
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val = ti_pipe3_readl(phy->pll_ctrl_base, PLL_STATUS);
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if ((val & PLL_TICOPWDN) && (val & PLL_LDOPWDN))
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break;
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} while (!time_after(jiffies, timeout));
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if (!(val & PLL_TICOPWDN) || !(val & PLL_LDOPWDN)) {
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dev_err(phy->dev, "Failed to power down: PLL_STATUS 0x%x\n",
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val);
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return -EBUSY;
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if (!(val & PLL_TICOPWDN) || !(val & PLL_LDOPWDN)) {
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dev_err(phy->dev, "Failed to power down: PLL_STATUS 0x%x\n",
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val);
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return -EBUSY;
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}
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}
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ti_pipe3_disable_clocks(phy);
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return 0;
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}
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static struct phy_ops ops = {
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@ -306,7 +307,6 @@ static int ti_pipe3_probe(struct platform_device *pdev)
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return -ENOMEM;
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phy->dev = &pdev->dev;
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spin_lock_init(&phy->lock);
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if (!of_device_is_compatible(node, "ti,phy-pipe3-pcie")) {
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match = of_match_device(ti_pipe3_id_table, &pdev->dev);
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@ -402,6 +402,10 @@ static int ti_pipe3_probe(struct platform_device *pdev)
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platform_set_drvdata(pdev, phy);
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pm_runtime_enable(phy->dev);
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/* Prevent auto-disable of refclk for SATA PHY due to Errata i783 */
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if (of_device_is_compatible(node, "ti,phy-pipe3-sata"))
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if (!IS_ERR(phy->refclk))
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clk_prepare_enable(phy->refclk);
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generic_phy = devm_phy_create(phy->dev, NULL, &ops);
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if (IS_ERR(generic_phy))
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@ -413,63 +417,33 @@ static int ti_pipe3_probe(struct platform_device *pdev)
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if (IS_ERR(phy_provider))
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return PTR_ERR(phy_provider);
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pm_runtime_get(&pdev->dev);
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return 0;
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}
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static int ti_pipe3_remove(struct platform_device *pdev)
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{
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if (!pm_runtime_suspended(&pdev->dev))
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pm_runtime_put(&pdev->dev);
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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#ifdef CONFIG_PM
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static int ti_pipe3_enable_refclk(struct ti_pipe3 *phy)
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static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
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{
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if (!IS_ERR(phy->refclk) && !phy->refclk_enabled) {
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int ret;
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int ret = 0;
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if (!IS_ERR(phy->refclk)) {
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ret = clk_prepare_enable(phy->refclk);
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if (ret) {
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dev_err(phy->dev, "Failed to enable refclk %d\n", ret);
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return ret;
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}
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phy->refclk_enabled = true;
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}
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return 0;
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}
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static void ti_pipe3_disable_refclk(struct ti_pipe3 *phy)
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{
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if (!IS_ERR(phy->refclk))
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clk_disable_unprepare(phy->refclk);
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phy->refclk_enabled = false;
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}
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static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
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{
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int ret = 0;
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unsigned long flags;
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spin_lock_irqsave(&phy->lock, flags);
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if (phy->enabled)
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goto err1;
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ret = ti_pipe3_enable_refclk(phy);
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if (ret)
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goto err1;
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if (!IS_ERR(phy->wkupclk)) {
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ret = clk_prepare_enable(phy->wkupclk);
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if (ret) {
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dev_err(phy->dev, "Failed to enable wkupclk %d\n", ret);
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goto err2;
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goto disable_refclk;
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}
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}
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@ -477,96 +451,33 @@ static int ti_pipe3_enable_clocks(struct ti_pipe3 *phy)
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ret = clk_prepare_enable(phy->div_clk);
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if (ret) {
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dev_err(phy->dev, "Failed to enable div_clk %d\n", ret);
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goto err3;
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goto disable_wkupclk;
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}
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}
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phy->enabled = true;
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spin_unlock_irqrestore(&phy->lock, flags);
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return 0;
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err3:
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disable_wkupclk:
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if (!IS_ERR(phy->wkupclk))
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clk_disable_unprepare(phy->wkupclk);
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err2:
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disable_refclk:
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if (!IS_ERR(phy->refclk))
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clk_disable_unprepare(phy->refclk);
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ti_pipe3_disable_refclk(phy);
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err1:
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spin_unlock_irqrestore(&phy->lock, flags);
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return ret;
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}
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static void ti_pipe3_disable_clocks(struct ti_pipe3 *phy)
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{
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unsigned long flags;
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spin_lock_irqsave(&phy->lock, flags);
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if (!phy->enabled) {
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spin_unlock_irqrestore(&phy->lock, flags);
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return;
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}
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if (!IS_ERR(phy->wkupclk))
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clk_disable_unprepare(phy->wkupclk);
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/* Don't disable refclk for SATA PHY due to Errata i783 */
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if (!of_device_is_compatible(phy->dev->of_node, "ti,phy-pipe3-sata"))
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ti_pipe3_disable_refclk(phy);
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if (!IS_ERR(phy->refclk))
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clk_disable_unprepare(phy->refclk);
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if (!IS_ERR(phy->div_clk))
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clk_disable_unprepare(phy->div_clk);
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phy->enabled = false;
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spin_unlock_irqrestore(&phy->lock, flags);
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}
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static int ti_pipe3_runtime_suspend(struct device *dev)
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{
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struct ti_pipe3 *phy = dev_get_drvdata(dev);
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ti_pipe3_disable_clocks(phy);
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return 0;
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}
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static int ti_pipe3_runtime_resume(struct device *dev)
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{
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struct ti_pipe3 *phy = dev_get_drvdata(dev);
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int ret = 0;
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ret = ti_pipe3_enable_clocks(phy);
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return ret;
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}
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static int ti_pipe3_suspend(struct device *dev)
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{
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struct ti_pipe3 *phy = dev_get_drvdata(dev);
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ti_pipe3_disable_clocks(phy);
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return 0;
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}
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static int ti_pipe3_resume(struct device *dev)
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{
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struct ti_pipe3 *phy = dev_get_drvdata(dev);
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int ret;
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ret = ti_pipe3_enable_clocks(phy);
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if (ret)
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return ret;
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pm_runtime_disable(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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return 0;
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}
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#endif
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static const struct dev_pm_ops ti_pipe3_pm_ops = {
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SET_RUNTIME_PM_OPS(ti_pipe3_runtime_suspend,
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ti_pipe3_runtime_resume, NULL)
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SET_SYSTEM_SLEEP_PM_OPS(ti_pipe3_suspend, ti_pipe3_resume)
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};
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static const struct of_device_id ti_pipe3_id_table[] = {
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{
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.compatible = "ti,phy-usb3",
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@ -592,7 +503,6 @@ static struct platform_driver ti_pipe3_driver = {
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.remove = ti_pipe3_remove,
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.driver = {
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.name = "ti-pipe3",
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.pm = &ti_pipe3_pm_ops,
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.of_match_table = ti_pipe3_id_table,
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},
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};
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