[PATCH 2/2] i2c: designware: Some broken DSTDs use 1MiHz instead of 1MHz

Hans de Goede
2017-07-08T13:11:02Z

At least the Acer Iconia Tab8 / aka W1-810 uses 1MiHz instead of
1MHz for one of its busses, fix this up to 1MHz instead of failing
the probe of that bus.

This fixes the accelerometer on the Acer Iconia Tab8 not working.

Cc: stable@vger.kernel.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/i2c/busses/i2c-designware-platdrv.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index d5acaf8d65bf..c6f5a41d72b5 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -254,6 +254,9 @@ 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;
/*
* Find bus speed from the "clock-frequency" device property, ACPI
* or by using fast mode if neither is set.
--
2.13.0