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Diffstat (limited to 'drivers/i2c/busses')
-rw-r--r--drivers/i2c/busses/i2c-designware-core.c22
-rw-r--r--drivers/i2c/busses/i2c-designware-platdrv.c104
2 files changed, 67 insertions, 59 deletions
diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index de7fbbb374cd..6974a99034c3 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -271,6 +271,17 @@ static void __i2c_dw_enable(struct dw_i2c_dev *dev, bool enable)
enable ? "en" : "dis");
}
+static unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev)
+{
+ /*
+ * Clock is not necessary if we got LCNT/HCNT values directly from
+ * the platform code.
+ */
+ if (WARN_ON_ONCE(!dev->get_clk_rate_khz))
+ return 0;
+ return dev->get_clk_rate_khz(dev);
+}
+
/**
* i2c_dw_init() - initialize the designware i2c master hardware
* @dev: device private data
@@ -281,7 +292,6 @@ static void __i2c_dw_enable(struct dw_i2c_dev *dev, bool enable)
*/
int i2c_dw_init(struct dw_i2c_dev *dev)
{
- u32 input_clock_khz;
u32 hcnt, lcnt;
u32 reg;
u32 sda_falling_time, scl_falling_time;
@@ -295,8 +305,6 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
}
}
- input_clock_khz = dev->get_clk_rate_khz(dev);
-
reg = dw_readl(dev, DW_IC_COMP_TYPE);
if (reg == ___constant_swab32(DW_IC_COMP_TYPE_VALUE)) {
/* Configure register endianess access */
@@ -325,12 +333,12 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
hcnt = dev->ss_hcnt;
lcnt = dev->ss_lcnt;
} else {
- hcnt = i2c_dw_scl_hcnt(input_clock_khz,
+ hcnt = i2c_dw_scl_hcnt(i2c_dw_clk_rate(dev),
4000, /* tHD;STA = tHIGH = 4.0 us */
sda_falling_time,
0, /* 0: DW default, 1: Ideal */
0); /* No offset */
- lcnt = i2c_dw_scl_lcnt(input_clock_khz,
+ lcnt = i2c_dw_scl_lcnt(i2c_dw_clk_rate(dev),
4700, /* tLOW = 4.7 us */
scl_falling_time,
0); /* No offset */
@@ -344,12 +352,12 @@ int i2c_dw_init(struct dw_i2c_dev *dev)
hcnt = dev->fs_hcnt;
lcnt = dev->fs_lcnt;
} else {
- hcnt = i2c_dw_scl_hcnt(input_clock_khz,
+ hcnt = i2c_dw_scl_hcnt(i2c_dw_clk_rate(dev),
600, /* tHD;STA = tHIGH = 0.6 us */
sda_falling_time,
0, /* 0: DW default, 1: Ideal */
0); /* No offset */
- lcnt = i2c_dw_scl_lcnt(input_clock_khz,
+ lcnt = i2c_dw_scl_lcnt(i2c_dw_clk_rate(dev),
1300, /* tLOW = 1.3 us */
scl_falling_time,
0); /* No offset */
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index a2ae2213ef3e..9e094478b9b3 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -209,16 +209,17 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
DW_IC_CON_RESTART_EN | DW_IC_CON_SPEED_FAST;
dev->clk = devm_clk_get(&pdev->dev, NULL);
- dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
- if (IS_ERR(dev->clk))
- return PTR_ERR(dev->clk);
- clk_prepare_enable(dev->clk);
+ if (!IS_ERR(dev->clk)) {
+ r = clk_prepare_enable(dev->clk);
+ if (r)
+ return r;
- if (!dev->sda_hold_time && ht) {
- u32 ic_clk = dev->get_clk_rate_khz(dev);
+ dev->get_clk_rate_khz = i2c_dw_get_clk_rate_khz;
- dev->sda_hold_time = div_u64((u64)ic_clk * ht + 500000,
- 1000000);
+ if (!dev->sda_hold_time && ht)
+ dev->sda_hold_time = div_u64(
+ (u64)dev->get_clk_rate_khz(dev) * ht + 500000,
+ 1000000);
}
if (!dev->tx_fifo_depth) {
@@ -235,18 +236,26 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev));
adap->dev.of_node = pdev->dev.of_node;
- if (dev->pm_runtime_disabled) {
- pm_runtime_forbid(&pdev->dev);
- } else {
- pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
- pm_runtime_use_autosuspend(&pdev->dev);
- pm_runtime_set_active(&pdev->dev);
- pm_runtime_enable(&pdev->dev);
- }
+ pm_runtime_get_noresume(&pdev->dev);
+ pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
+ if (dev->pm_runtime_disabled)
+ pm_runtime_get_noresume(&pdev->dev);
r = i2c_dw_probe(dev);
- if (r && !dev->pm_runtime_disabled)
+ if (r) {
+ if (!IS_ERR(dev->clk))
+ clk_disable_unprepare(dev->clk);
pm_runtime_disable(&pdev->dev);
+ pm_runtime_dont_use_autosuspend(&pdev->dev);
+ if (dev->pm_runtime_disabled)
+ pm_runtime_put_noidle(&pdev->dev);
+ }
+ pm_runtime_mark_last_busy(&pdev->dev);
+ pm_runtime_put(&pdev->dev);
return r;
}
@@ -261,10 +270,16 @@ static int dw_i2c_plat_remove(struct platform_device *pdev)
i2c_dw_disable(dev);
+ if (!IS_ERR(dev->clk))
+ clk_disable_unprepare(dev->clk);
+
+ pm_runtime_disable(&pdev->dev);
pm_runtime_dont_use_autosuspend(&pdev->dev);
- pm_runtime_put_sync(&pdev->dev);
- if (!dev->pm_runtime_disabled)
- pm_runtime_disable(&pdev->dev);
+ if (dev->pm_runtime_disabled)
+ pm_runtime_put_noidle(&pdev->dev);
+
+ pm_runtime_put_noidle(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);
return 0;
}
@@ -277,62 +292,47 @@ static const struct of_device_id dw_i2c_of_match[] = {
MODULE_DEVICE_TABLE(of, dw_i2c_of_match);
#endif
-#ifdef CONFIG_PM_SLEEP
-static int dw_i2c_plat_prepare(struct device *dev)
+#ifdef CONFIG_PM
+static int i2c_dw_plat_prepare_clk(struct dw_i2c_dev *i_dev, bool prepare)
{
- return pm_runtime_suspended(dev);
-}
+ if (IS_ERR(i_dev->clk))
+ return PTR_ERR(i_dev->clk);
-static void dw_i2c_plat_complete(struct device *dev)
-{
- if (dev->power.direct_complete)
- pm_request_resume(dev);
+ if (prepare)
+ return clk_prepare_enable(i_dev->clk);
+
+ clk_disable_unprepare(i_dev->clk);
+ return 0;
}
-#else
-#define dw_i2c_plat_prepare NULL
-#define dw_i2c_plat_complete NULL
-#endif
-#ifdef CONFIG_PM
static int dw_i2c_plat_runtime_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
i2c_dw_disable(i_dev);
- clk_disable_unprepare(i_dev->clk);
+ i2c_dw_plat_prepare_clk(i_dev, false);
return 0;
}
-static int dw_i2c_plat_resume(struct device *dev)
+static int dw_i2c_plat_runtime_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev);
- clk_prepare_enable(i_dev->clk);
-
- if (!i_dev->pm_runtime_disabled)
- i2c_dw_init(i_dev);
+ i2c_dw_plat_prepare_clk(i_dev, true);
+ i2c_dw_init(i_dev);
return 0;
}
-#ifdef CONFIG_PM_SLEEP
-static int dw_i2c_plat_suspend(struct device *dev)
-{
- pm_runtime_resume(dev);
- return dw_i2c_plat_runtime_suspend(dev);
-}
-#endif
-
static const struct dev_pm_ops dw_i2c_dev_pm_ops = {
- .prepare = dw_i2c_plat_prepare,
- .complete = dw_i2c_plat_complete,
- SET_SYSTEM_SLEEP_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume)
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(dw_i2c_plat_runtime_suspend,
- dw_i2c_plat_resume,
- NULL)
+ dw_i2c_plat_runtime_resume,
+ NULL)
};
#define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops)
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-25 15:39:13 +0000