linux-kernel - Re: [PATCH V2 3/4] i2c: tegra: Add DMA Support

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Date:   Sat, 26 Jan 2019 01:09:19 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        "thierry.reding@...il.com" <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mantravadi Karthik <mkarthik@...dia.com>,
        Shardar Mohammed <smohammed@...dia.com>,
        Timo Alho <talho@...dia.com>
Cc:     "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>
Subject: Re: [PATCH V2 3/4] i2c: tegra: Add DMA Support

26.01.2019 0:49, Dmitry Osipenko пишет:

> 3) After applying these patches I2C transfers are failing on Tegra20 with "tegra-i2c 7000c400.i2c: Failed to allocate the DMA buffer". 
> 

Actually scratch the above, turned out I haven't applied patches correctly. In fact patches are failing to apply with:

# git apply --verbose V2-3-4-i2c-tegra-Add-DMA-Support.patch
Checking patch drivers/i2c/busses/i2c-tegra.c...
Hunk #4 succeeded at 198 (offset 3 lines).
Hunk #5 succeeded at 212 (offset 3 lines).
Hunk #6 succeeded at 229 (offset 3 lines).
Hunk #7 succeeded at 243 (offset 3 lines).
Hunk #8 succeeded at 321 (offset 3 lines).
Hunk #9 succeeded at 636 (offset 3 lines).
Hunk #10 succeeded at 751 (offset 3 lines).
Hunk #11 succeeded at 798 (offset 3 lines).
Hunk #12 succeeded at 968 (offset 3 lines).
Hunk #13 succeeded at 996 (offset 3 lines).
Hunk #14 succeeded at 1050 (offset 3 lines).
Hunk #15 succeeded at 1075 (offset 3 lines).
Hunk #16 succeeded at 1125 (offset 3 lines).
Hunk #17 succeeded at 1180 (offset 3 lines).
Hunk #18 succeeded at 1304 (offset 13 lines).
error: while searching for:
                return -ENOMEM;

        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;

        i2c_dev->rst = devm_reset_control_get_exclusive(&pdev->dev, "i2c");
        if (IS_ERR(i2c_dev->rst)) {

error: patch failed: drivers/i2c/busses/i2c-tegra.c:1000
error: drivers/i2c/busses/i2c-tegra.c: patch does not apply


Please use "git format-patch -4 xxxx" and do not edit patches manually.