From: Hans de Goede <hdegoede@redhat.com>
To: Jarkko Nikula <jarkko.nikula@linux.intel.com>,
Wolfram Sang <wsa@the-dreams.de>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Hans de Goede <hdegoede@redhat.com>,
linux-i2c@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH v3 2/2] i2c: designware: Some broken DSTDs use 1MiHz instead of 1MHz
Date: Thu, 13 Jul 2017 15:45:02 +0200 [thread overview]
Message-ID: <20170713134502.10816-2-hdegoede@redhat.com> (raw)
In-Reply-To: <20170713134502.10816-1-hdegoede@redhat.com>
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 d139b156f9c9..143a8fd582b4 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c
@@ -298,6 +298,9 @@ 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
next prev parent reply other threads:[~2017-07-13 13:45 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-13 13:45 [PATCH v3 1/2] i2c: designware: Print clock freq on invalid clock freq error Hans de Goede
2017-07-13 13:45 ` Hans de Goede [this message]
2017-07-16 14:04 ` [PATCH v3 2/2] i2c: designware: Some broken DSTDs use 1MiHz instead of 1MHz Andy Shevchenko
2017-07-21 22:15 ` Hans de Goede
2017-07-31 13:57 ` Wolfram Sang
2017-07-31 13:56 ` Wolfram Sang
2017-07-16 14:02 ` [PATCH v3 1/2] i2c: designware: Print clock freq on invalid clock freq error Andy Shevchenko
2017-07-31 13:56 ` Wolfram Sang
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