[PATCH v2 3/5] i2c: add I2C_AQ_NO_CLK_STRETCH to i2c-bcm2835.c
From: Nicola Corna <hidden>
Date: 2015-10-29 11:34:25
Also in:
linux-i2c, linux-iio
Subsystem:
i2c subsystem, i2c subsystem host drivers, the rest · Maintainers:
Wolfram Sang, Andi Shyti, Linus Torvalds
As reported here http://www.advamation.com/knowhow/raspberrypi/rpi-i2c-bug.html and confirmed here https://www.raspberrypi.org/forums/viewtopic.php?p=146272 the BCM2835 has a hardware bug in its i2c module which prevents a correct clock stretching. This patch adds the I2C_AQ_NO_CLK_STRETCH quirk flag to i2c-bcm2835. Signed-off-by: Nicola Corna <redacted> --- drivers/i2c/busses/i2c-bcm2835.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c
index 3032b89..38d7102 100644
--- a/drivers/i2c/busses/i2c-bcm2835.c
+++ b/drivers/i2c/busses/i2c-bcm2835.c@@ -222,6 +222,10 @@ static const struct i2c_algorithm bcm2835_i2c_algo = { .functionality = bcm2835_i2c_func, }; +static const struct i2c_adapter_quirks bcm2835_i2c_quirks = { + .flags = I2C_AQ_NO_CLK_STRETCH, +}; + static int bcm2835_i2c_probe(struct platform_device *pdev) { struct bcm2835_i2c_dev *i2c_dev;
@@ -293,6 +297,7 @@ static int bcm2835_i2c_probe(struct platform_device *pdev) adap->algo = &bcm2835_i2c_algo; adap->dev.parent = &pdev->dev; adap->dev.of_node = pdev->dev.of_node; + adap->quirks = &bcm2835_i2c_quirks; bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_C, 0);
--
2.6.1