| Message ID | 1372845160-32625-1-git-send-email-mika.westerberg@linux.intel.com |
|---|---|
| State | Superseded |
| Headers | show |
On Wed, Jul 03, 2013 at 12:52:40PM +0300, Mika Westerberg wrote: > Some Intel LPSS I2C devices make the SDA hold time parameter available via > SSCN (standard mode) and FMCN (fast mode) ACPI methods. If we find that > such method exist, we evaluate it and pass the returned SDA hold value to > the i2c-designware core analogous to Device Tree. > > Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Please disregard this patch. I'll send a new one that combines both setting of SDA hold time and *CNT values from ACPI. -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 8b9d3f1..c7cfdac 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -57,13 +57,30 @@ static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) static int dw_i2c_acpi_configure(struct platform_device *pdev) { struct dw_i2c_dev *dev = platform_get_drvdata(pdev); + struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER }; + acpi_handle handle = ACPI_HANDLE(&pdev->dev); + acpi_string name; - if (!ACPI_HANDLE(&pdev->dev)) + if (!handle) return -ENODEV; dev->adapter.nr = -1; dev->tx_fifo_depth = 32; dev->rx_fifo_depth = 32; + + name = dev->master_cfg & DW_IC_CON_SPEED_FAST ? "FMCN" : "SSCN"; + if (ACPI_SUCCESS(acpi_evaluate_object(handle, name, NULL, &buf))) { + union acpi_object *obj = (union acpi_object *)buf.pointer; + + if (obj->type == ACPI_TYPE_PACKAGE && obj->package.count == 3) { + const union acpi_object *objs = obj->package.elements; + + dev->sda_hold_time = (u32)objs[2].integer.value; + } + + kfree(buf.pointer); + } + return 0; }
Some Intel LPSS I2C devices make the SDA hold time parameter available via SSCN (standard mode) and FMCN (fast mode) ACPI methods. If we find that such method exist, we evaluate it and pass the returned SDA hold value to the i2c-designware core analogous to Device Tree. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> --- drivers/i2c/busses/i2c-designware-platdrv.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-)