mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
i2c: bcm2835: add I2C_AQ_NO_CLK_STRETCH
As reported in the links given below. 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 <nicola@corna.info> [wsa: put the links into the code as comments] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
parent
a94d306b71
commit
4dbfb5f440
1 changed files with 10 additions and 0 deletions
|
@ -222,6 +222,15 @@ static const struct i2c_algorithm bcm2835_i2c_algo = {
|
|||
.functionality = bcm2835_i2c_func,
|
||||
};
|
||||
|
||||
/*
|
||||
* This HW was reported to have problems with clock stretching:
|
||||
* http://www.advamation.com/knowhow/raspberrypi/rpi-i2c-bug.html
|
||||
* https://www.raspberrypi.org/forums/viewtopic.php?p=146272
|
||||
*/
|
||||
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 +302,7 @@ 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);
|
||||
|
||||
|
|
Loading…
Reference in a new issue