diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-designware-platdrv.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-platdrv.c | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 143a8fd582b4..2b98a173136f 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -198,8 +198,7 @@ static void i2c_dw_configure_slave(struct dw_i2c_dev *dev) dev->functionality = I2C_FUNC_SLAVE | DW_IC_DEFAULT_FUNCTIONALITY; dev->slave_cfg = DW_IC_CON_RX_FIFO_FULL_HLD_CTRL | - DW_IC_CON_RESTART_EN | DW_IC_CON_STOP_DET_IFADDRESSED | - DW_IC_CON_SPEED_FAST; + DW_IC_CON_RESTART_EN | DW_IC_CON_STOP_DET_IFADDRESSED; dev->mode = DW_IC_SLAVE; @@ -257,7 +256,8 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) struct dw_i2c_dev *dev; u32 acpi_speed, ht = 0; struct resource *mem; - int irq, ret; + int i, irq, ret; + const int supported_speeds[] = { 0, 100000, 400000, 1000000, 3400000 }; irq = platform_get_irq(pdev, 0); if (irq < 0) @@ -298,9 +298,16 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) } acpi_speed = i2c_acpi_find_bus_speed(&pdev->dev); - /* Some broken DSTDs use 1MiHz instead of 1MHz */ - if (acpi_speed == 1048576) - acpi_speed = 1000000; + /* + * Some DSTDs use a non standard speed, round down to the lowest + * standard speed. + */ + for (i = 1; i < ARRAY_SIZE(supported_speeds); i++) { + if (acpi_speed < supported_speeds[i]) + break; + } + acpi_speed = supported_speeds[i - 1]; + /* * Find bus speed from the "clock-frequency" device property, ACPI * or by using fast mode if neither is set. @@ -430,7 +437,7 @@ static void dw_i2c_plat_complete(struct device *dev) #endif #ifdef CONFIG_PM -static int dw_i2c_plat_suspend(struct device *dev) +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); @@ -452,11 +459,21 @@ static int dw_i2c_plat_resume(struct device *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_RUNTIME_PM_OPS(dw_i2c_plat_suspend, dw_i2c_plat_resume, NULL) + SET_RUNTIME_PM_OPS(dw_i2c_plat_runtime_suspend, + dw_i2c_plat_resume, + NULL) }; #define DW_I2C_DEV_PMOPS (&dw_i2c_dev_pm_ops) |