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clk: imx: lpcg: add suspend/resume support
LPCG clock state may be lost when it's power domain is completely off during system suspend/resume and we need save and restore the state properly. Reviewed-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com> Signed-off-by: Shawn Guo <shawnguo@kernel.org>
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18cdbad40c
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3 changed files with 39 additions and 0 deletions
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@ -364,6 +364,7 @@ static struct platform_driver imx8qxp_lpcg_clk_driver = {
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.driver = {
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.driver = {
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.name = "imx8qxp-lpcg-clk",
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.name = "imx8qxp-lpcg-clk",
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.of_match_table = imx8qxp_lpcg_match,
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.of_match_table = imx8qxp_lpcg_match,
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.pm = &imx_clk_lpcg_scu_pm_ops,
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.suppress_bind_attrs = true,
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.suppress_bind_attrs = true,
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},
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},
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.probe = imx8qxp_lpcg_clk_probe,
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.probe = imx8qxp_lpcg_clk_probe,
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@ -34,6 +34,9 @@ struct clk_lpcg_scu {
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void __iomem *reg;
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void __iomem *reg;
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u8 bit_idx;
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u8 bit_idx;
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bool hw_gate;
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bool hw_gate;
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/* for state save&restore */
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u32 state;
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};
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};
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#define to_clk_lpcg_scu(_hw) container_of(_hw, struct clk_lpcg_scu, hw)
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#define to_clk_lpcg_scu(_hw) container_of(_hw, struct clk_lpcg_scu, hw)
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@ -113,6 +116,9 @@ struct clk_hw *__imx_clk_lpcg_scu(struct device *dev, const char *name,
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hw = ERR_PTR(ret);
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hw = ERR_PTR(ret);
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}
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}
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if (dev)
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dev_set_drvdata(dev, clk);
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return hw;
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return hw;
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}
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}
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@ -123,3 +129,34 @@ void imx_clk_lpcg_scu_unregister(struct clk_hw *hw)
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clk_hw_unregister(&clk->hw);
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clk_hw_unregister(&clk->hw);
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kfree(clk);
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kfree(clk);
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}
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}
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static int __maybe_unused imx_clk_lpcg_scu_suspend(struct device *dev)
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{
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struct clk_lpcg_scu *clk = dev_get_drvdata(dev);
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clk->state = readl_relaxed(clk->reg);
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dev_dbg(dev, "save lpcg state 0x%x\n", clk->state);
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return 0;
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}
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static int __maybe_unused imx_clk_lpcg_scu_resume(struct device *dev)
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{
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struct clk_lpcg_scu *clk = dev_get_drvdata(dev);
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/*
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* FIXME: Sometimes writes don't work unless the CPU issues
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* them twice
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*/
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writel(clk->state, clk->reg);
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writel(clk->state, clk->reg);
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dev_dbg(dev, "restore lpcg state 0x%x\n", clk->state);
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return 0;
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}
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const struct dev_pm_ops imx_clk_lpcg_scu_pm_ops = {
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SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(imx_clk_lpcg_scu_suspend,
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imx_clk_lpcg_scu_resume)
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};
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@ -11,6 +11,7 @@
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#include <linux/of.h>
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#include <linux/of.h>
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extern struct list_head imx_scu_clks[];
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extern struct list_head imx_scu_clks[];
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extern const struct dev_pm_ops imx_clk_lpcg_scu_pm_ops;
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int imx_clk_scu_init(struct device_node *np);
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int imx_clk_scu_init(struct device_node *np);
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struct clk_hw *imx_scu_of_clk_src_get(struct of_phandle_args *clkspec,
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struct clk_hw *imx_scu_of_clk_src_get(struct of_phandle_args *clkspec,
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