From 3aaa34b9923b994c13267e05ce8246faa1e8c8eb Mon Sep 17 00:00:00 2001 From: Wolfram Sang Date: Tue, 16 Jun 2015 19:57:29 +0200 Subject: [PATCH] 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: Wolfram Sang Reviewed-by: Alexander Sverdlin --- drivers/i2c/busses/i2c-tegra.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 0a1b6eacef0f..78a366814696 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -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; -- 2.39.5