| Message ID | 1369404899-23910-1-git-send-email-luis.henriques@canonical.com |
|---|---|
| State | New |
| Headers | show |
diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c index 37b1221..534fc13 100644 --- a/drivers/i2c/busses/i2c-designware-core.c +++ b/drivers/i2c/busses/i2c-designware-core.c @@ -360,7 +360,8 @@ static void i2c_dw_xfer_init(struct dw_i2c_dev *dev) /* Enable the adapter */ dw_writel(dev, 1, DW_IC_ENABLE); - /* Enable interrupts */ + /* Clear and enable interrupts */ + i2c_dw_clear_int(dev); dw_writel(dev, DW_IC_INTR_DEFAULT_MASK, DW_IC_INTR_MASK); }
This is a note to let you know that I have just added a patch titled i2c: designware: always clear interrupts before enabling them to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.5.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From 05c3562d6602d69ebdbb6d44fc49ce00a606bd30 Mon Sep 17 00:00:00 2001 From: Mika Westerberg <mika.westerberg@linux.intel.com> Date: Mon, 13 May 2013 00:54:30 +0000 Subject: [PATCH] i2c: designware: always clear interrupts before enabling them commit 2a2d95e9d6d29e726cc294b65391917ed2e32bf4 upstream. If the I2C bus is put to a low power state by an ACPI method it might pull the SDA line low (as its power is removed). Once the bus is put to full power state again, the SDA line is pulled back to high. This transition looks like a STOP condition from the controller point-of-view which sets STOP detected bit in its status register causing the driver to fail subsequent transfers. Fix this by always clearing all interrupts before we start a transfer. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> [ luis: adjust context ] Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- drivers/i2c/busses/i2c-designware-core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) -- 1.8.1.2