diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-designware-platdrv.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-platdrv.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 57248bccadbc..0e65b97842b4 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -256,7 +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) @@ -297,9 +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. @@ -431,8 +439,7 @@ static void dw_i2c_plat_complete(struct device *dev) #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); + struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); i_dev->disable(i_dev); i2c_dw_plat_prepare_clk(i_dev, false); @@ -442,8 +449,7 @@ static int dw_i2c_plat_runtime_suspend(struct device *dev) static int dw_i2c_plat_resume(struct device *dev) { - struct platform_device *pdev = to_platform_device(dev); - struct dw_i2c_dev *i_dev = platform_get_drvdata(pdev); + struct dw_i2c_dev *i_dev = dev_get_drvdata(dev); i2c_dw_plat_prepare_clk(i_dev, true); i_dev->init(i_dev); |
