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i2c: tegra: apply size limit quirk

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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: Wolfram Sang <wsa@the-dreams.de>
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
This commit is contained in:
Wolfram Sang 2015-06-16 19:57:29 +02:00
parent 4bb28e3776
commit 3aaa34b992
1 changed files with 7 additions and 0 deletions
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7
drivers/i2c/busses/i2c-tegra.c
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@ -669,6 +669,12 @@ static const struct i2c_algorithm tegra_i2c_algo = {
.functionality = tegra_i2c_func, .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 = { static const struct tegra_i2c_hw_feature tegra20_i2c_hw = {
.has_continue_xfer_support = false, .has_continue_xfer_support = false,
.has_per_pkt_xfer_complete_irq = 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->base = base;
i2c_dev->div_clk = div_clk; i2c_dev->div_clk = div_clk;
i2c_dev->adapter.algo = &tegra_i2c_algo; i2c_dev->adapter.algo = &tegra_i2c_algo;
i2c_dev->adapter.quirks = &tegra_i2c_quirks;
i2c_dev->irq = irq; i2c_dev->irq = irq;
i2c_dev->cont_id = pdev->id; i2c_dev->cont_id = pdev->id;
i2c_dev->dev = &pdev->dev; i2c_dev->dev = &pdev->dev;