From: Fabien Dessenne fabien.dessenne@foss.st.com
[ Upstream commit 60630924bb5af8751adcecc896e7763c3783ca89 ]
Set the clock during probe and keep its control during suspend / resume operations. This fixes an issue when CONFIG_PM is not set and where the clock is never enabled.
Make use of devm_ functions to simplify the code.
Signed-off-by: Fabien Dessenne fabien.dessenne@foss.st.com Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org Link: https://lore.kernel.org/r/20211011135836.1045437-1-fabien.dessenne@foss.st.c... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hwspinlock/stm32_hwspinlock.c | 58 +++++++++++++++++---------- 1 file changed, 37 insertions(+), 21 deletions(-)
diff --git a/drivers/hwspinlock/stm32_hwspinlock.c b/drivers/hwspinlock/stm32_hwspinlock.c index c8eacf4f9692b..f1ca4717230ac 100644 --- a/drivers/hwspinlock/stm32_hwspinlock.c +++ b/drivers/hwspinlock/stm32_hwspinlock.c @@ -54,8 +54,23 @@ static const struct hwspinlock_ops stm32_hwspinlock_ops = { .relax = stm32_hwspinlock_relax, };
+static void stm32_hwspinlock_disable_clk(void *data) +{ + struct platform_device *pdev = data; + struct stm32_hwspinlock *hw = platform_get_drvdata(pdev); + struct device *dev = &pdev->dev; + + pm_runtime_get_sync(dev); + pm_runtime_disable(dev); + pm_runtime_set_suspended(dev); + pm_runtime_put_noidle(dev); + + clk_disable_unprepare(hw->clk); +} + static int stm32_hwspinlock_probe(struct platform_device *pdev) { + struct device *dev = &pdev->dev; struct stm32_hwspinlock *hw; void __iomem *io_base; struct resource *res; @@ -68,41 +83,43 @@ static int stm32_hwspinlock_probe(struct platform_device *pdev) return PTR_ERR(io_base);
array_size = STM32_MUTEX_NUM_LOCKS * sizeof(struct hwspinlock); - hw = devm_kzalloc(&pdev->dev, sizeof(*hw) + array_size, GFP_KERNEL); + hw = devm_kzalloc(dev, sizeof(*hw) + array_size, GFP_KERNEL); if (!hw) return -ENOMEM;
- hw->clk = devm_clk_get(&pdev->dev, "hsem"); + hw->clk = devm_clk_get(dev, "hsem"); if (IS_ERR(hw->clk)) return PTR_ERR(hw->clk);
- for (i = 0; i < STM32_MUTEX_NUM_LOCKS; i++) - hw->bank.lock[i].priv = io_base + i * sizeof(u32); + ret = clk_prepare_enable(hw->clk); + if (ret) { + dev_err(dev, "Failed to prepare_enable clock\n"); + return ret; + }
platform_set_drvdata(pdev, hw); - pm_runtime_enable(&pdev->dev);
- ret = hwspin_lock_register(&hw->bank, &pdev->dev, &stm32_hwspinlock_ops, - 0, STM32_MUTEX_NUM_LOCKS); + pm_runtime_get_noresume(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + pm_runtime_put(dev);
- if (ret) - pm_runtime_disable(&pdev->dev); + ret = devm_add_action_or_reset(dev, stm32_hwspinlock_disable_clk, pdev); + if (ret) { + dev_err(dev, "Failed to register action\n"); + return ret; + }
- return ret; -} + for (i = 0; i < STM32_MUTEX_NUM_LOCKS; i++) + hw->bank.lock[i].priv = io_base + i * sizeof(u32);
-static int stm32_hwspinlock_remove(struct platform_device *pdev) -{ - struct stm32_hwspinlock *hw = platform_get_drvdata(pdev); - int ret; + ret = devm_hwspin_lock_register(dev, &hw->bank, &stm32_hwspinlock_ops, + 0, STM32_MUTEX_NUM_LOCKS);
- ret = hwspin_lock_unregister(&hw->bank); if (ret) - dev_err(&pdev->dev, "%s failed: %d\n", __func__, ret); - - pm_runtime_disable(&pdev->dev); + dev_err(dev, "Failed to register hwspinlock\n");
- return 0; + return ret; }
static int __maybe_unused stm32_hwspinlock_runtime_suspend(struct device *dev) @@ -137,7 +154,6 @@ MODULE_DEVICE_TABLE(of, stm32_hwpinlock_ids);
static struct platform_driver stm32_hwspinlock_driver = { .probe = stm32_hwspinlock_probe, - .remove = stm32_hwspinlock_remove, .driver = { .name = "stm32_hwspinlock", .of_match_table = stm32_hwpinlock_ids,