diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-designware-platdrv.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-platdrv.c | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 0b42a12171f3..08153ea4d848 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -176,9 +176,6 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) dev->irq = irq; platform_set_drvdata(pdev, dev); - /* fast mode by default because of legacy reasons */ - dev->clk_freq = 400000; - if (pdata) { dev->clk_freq = pdata->i2c_scl_freq; } else { @@ -193,8 +190,16 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) } acpi_speed = i2c_acpi_find_bus_speed(&pdev->dev); - if (acpi_speed) - dev->clk_freq = acpi_speed; + /* + * Find bus speed from the "clock-frequency" device property, ACPI + * or by using fast mode if neither is set. + */ + if (acpi_speed && dev->clk_freq) + dev->clk_freq = min(dev->clk_freq, acpi_speed); + else if (acpi_speed || dev->clk_freq) + dev->clk_freq = max(dev->clk_freq, acpi_speed); + else + dev->clk_freq = 400000; if (has_acpi_companion(&pdev->dev)) dw_i2c_acpi_configure(pdev); @@ -214,13 +219,7 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) if (r) return r; - dev->functionality = - I2C_FUNC_I2C | - I2C_FUNC_10BIT_ADDR | - I2C_FUNC_SMBUS_BYTE | - I2C_FUNC_SMBUS_BYTE_DATA | - I2C_FUNC_SMBUS_WORD_DATA | - I2C_FUNC_SMBUS_I2C_BLOCK; + dev->functionality = I2C_FUNC_10BIT_ADDR | DW_IC_DEFAULT_FUNCTIONALITY; dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | DW_IC_CON_RESTART_EN; |