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Commit 3aaa34b9 authored by Wolfram Sang's avatar Wolfram Sang
Browse files

i2c: tegra: apply size limit quirk 



payload_size is a 12 bit field in the HW register, so add a limit for
this size. That way we gracefully reject the message beforehand instead
of generating an OOPS while transferring. Verified using some older
Tegra2 documentation and a more recent Jetson TK1 board.

Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
Reviewed-by: default avatarAlexander Sverdlin <alexander.sverdlin@nokia.com>
parent 4bb28e37

drivers/i2c/busses/i2c-tegra.c

+7 −0
Original line number Diff line number Diff line
@@ -669,6 +669,12 @@ static const struct i2c_algorithm tegra_i2c_algo = { 
	.functionality	= tegra_i2c_func,

};



/* payload size is only 12 bit */

static struct i2c_adapter_quirks tegra_i2c_quirks = {

	.max_read_len = 4096,

	.max_write_len = 4096,

};



static const struct tegra_i2c_hw_feature tegra20_i2c_hw = {

	.has_continue_xfer_support = false,

	.has_per_pkt_xfer_complete_irq = false,
@@ -739,6 +745,7 @@ static int tegra_i2c_probe(struct platform_device *pdev) 
	i2c_dev->base = base;

	i2c_dev->div_clk = div_clk;

	i2c_dev->adapter.algo = &tegra_i2c_algo;

	i2c_dev->adapter.quirks = &tegra_i2c_quirks;

	i2c_dev->irq = irq;

	i2c_dev->cont_id = pdev->id;

	i2c_dev->dev = &pdev->dev;