This patch intends to implement intmux PM.
ChangeLogs:
V2->V3:
1. allocate u32 saved_reg for a per channel.
V1->V2:
1. add more detailed commit message.
2. use u32 for 32bit HW registers.
3. fix kbuild failures.
4. move trivial functions into their respective callers.
5. squash two patches together.
Joakim Zhang (1):
irqchip: imx-intmux: implement intmux PM
drivers/irqchip/irq-imx-intmux.c | 67 +++++++++++++++++++++++++++++++-
1 file changed, 65 insertions(+), 2 deletions(-)
--
2.17.1
When system suspended, we could explicitly disable clock to save power.
And we need save registers' state since it could be lost after power
off.
Implement PM which will:
1) Without CONFIG_PM, clock is always on after probe stage.
2) With CONFIG_PM, clock is off after probe stage.
3) Disable clock and save registers' state when do system suspend and
enable clock and restore registers' state while system resume.
4) Make Power Domain framework be able to shutdown the corresponding
power domain of this device.
Signed-off-by: Joakim Zhang <[email protected]>
---
drivers/irqchip/irq-imx-intmux.c | 67 +++++++++++++++++++++++++++++++-
1 file changed, 65 insertions(+), 2 deletions(-)
diff --git a/drivers/irqchip/irq-imx-intmux.c b/drivers/irqchip/irq-imx-intmux.c
index c27577c81126..4524c931c368 100644
--- a/drivers/irqchip/irq-imx-intmux.c
+++ b/drivers/irqchip/irq-imx-intmux.c
@@ -53,6 +53,7 @@
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/spinlock.h>
+#include <linux/pm_runtime.h>
#define CHANIER(n) (0x10 + (0x40 * n))
#define CHANIPR(n) (0x20 + (0x40 * n))
@@ -60,6 +61,8 @@
#define CHAN_MAX_NUM 0x8
struct intmux_irqchip_data {
+ struct irq_chip chip;
+ u32 saved_reg;
int chanidx;
int irq;
struct irq_domain *domain;
@@ -120,8 +123,10 @@ static struct irq_chip imx_intmux_irq_chip = {
static int imx_intmux_irq_map(struct irq_domain *h, unsigned int irq,
irq_hw_number_t hwirq)
{
- irq_set_chip_data(irq, h->host_data);
- irq_set_chip_and_handler(irq, &imx_intmux_irq_chip, handle_level_irq);
+ struct intmux_irqchip_data *data = h->host_data;
+
+ irq_set_chip_data(irq, data);
+ irq_set_chip_and_handler(irq, &data->chip, handle_level_irq);
return 0;
}
@@ -232,6 +237,10 @@ static int imx_intmux_probe(struct platform_device *pdev)
data->channum = channum;
raw_spin_lock_init(&data->lock);
+ pm_runtime_get_noresume(&pdev->dev);
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
ret = clk_prepare_enable(data->ipg_clk);
if (ret) {
dev_err(&pdev->dev, "failed to enable ipg clk: %d\n", ret);
@@ -239,6 +248,8 @@ static int imx_intmux_probe(struct platform_device *pdev)
}
for (i = 0; i < channum; i++) {
+ data->irqchip_data[i].chip = imx_intmux_irq_chip;
+ data->irqchip_data[i].chip.parent_device = &pdev->dev;
data->irqchip_data[i].chanidx = i;
data->irqchip_data[i].irq = irq_of_parse_and_map(np, i);
@@ -267,6 +278,12 @@ static int imx_intmux_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, data);
+ /*
+ * Let pm_runtime_put() disable clock.
+ * If CONFIG_PM is not enabled, the clock will stay powered.
+ */
+ pm_runtime_put(&pdev->dev);
+
return 0;
out:
clk_disable_unprepare(data->ipg_clk);
@@ -288,11 +305,56 @@ static int imx_intmux_remove(struct platform_device *pdev)
irq_domain_remove(data->irqchip_data[i].domain);
}
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int imx_intmux_runtime_suspend(struct device *dev)
+{
+ struct intmux_data *data = dev_get_drvdata(dev);
+ struct intmux_irqchip_data irqchip_data;
+ int i;
+
+ for (i = 0; i < data->channum; i++) {
+ irqchip_data = data->irqchip_data[i];
+ irqchip_data.saved_reg = readl_relaxed(data->regs + CHANIER(i));
+ }
+
clk_disable_unprepare(data->ipg_clk);
return 0;
}
+static int imx_intmux_runtime_resume(struct device *dev)
+{
+ struct intmux_data *data = dev_get_drvdata(dev);
+ struct intmux_irqchip_data irqchip_data;
+ int ret, i;
+
+ ret = clk_prepare_enable(data->ipg_clk);
+ if (ret) {
+ dev_err(dev, "failed to enable ipg clk: %d\n", ret);
+ return ret;
+ }
+
+ for (i = 0; i < data->channum; i++) {
+ irqchip_data = data->irqchip_data[i];
+ writel_relaxed(irqchip_data.saved_reg, data->regs + CHANIER(i));
+ }
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops imx_intmux_pm_ops = {
+ SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(imx_intmux_runtime_suspend,
+ imx_intmux_runtime_resume, NULL)
+};
+
static const struct of_device_id imx_intmux_id[] = {
{ .compatible = "fsl,imx-intmux", },
{ /* sentinel */ },
@@ -302,6 +364,7 @@ static struct platform_driver imx_intmux_driver = {
.driver = {
.name = "imx-intmux",
.of_match_table = imx_intmux_id,
+ .pm = &imx_intmux_pm_ops,
},
.probe = imx_intmux_probe,
.remove = imx_intmux_remove,
--
2.17.1
On Mon, 27 Jul 2020 22:17:33 +0800, Joakim Zhang wrote:
> This patch intends to implement intmux PM.
>
> ChangeLogs:
> V2->V3:
> 1. allocate u32 saved_reg for a per channel.
>
> V1->V2:
> 1. add more detailed commit message.
> 2. use u32 for 32bit HW registers.
> 3. fix kbuild failures.
> 4. move trivial functions into their respective callers.
> 5. squash two patches together.
>
> [...]
Applied to irq/irqchip-next, thanks!
[1/1] irqchip/imx-intmux: Implement intmux runtime power management
commit: bb403111e017a327737242eca40311921f833627
Cheers,
M.
--
Without deviation from the norm, progress is not possible.