From: Dmitry Osipenko <digetx@gmail.com>
To: Sowjanya Komatineni <skomatineni@nvidia.com>,
"thierry.reding@gmail.com" <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Mantravadi Karthik <mkarthik@nvidia.com>,
Shardar Mohammed <smohammed@nvidia.com>,
Timo Alho <talho@nvidia.com>
Cc: "linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>
Subject: Re: [PATCH V9 3/5] i2c: tegra: Add DMA support
Date: Fri, 1 Feb 2019 22:22:25 +0300 [thread overview]
Message-ID: <6150de70-6ca8-944a-780a-4574ff2b21c7@gmail.com> (raw)
In-Reply-To: <BYAPR12MB33984FB81B8BB1EC8C0C4908C2920@BYAPR12MB3398.namprd12.prod.outlook.com>
01.02.2019 22:20, Sowjanya Komatineni пишет:
>
>>> +static int tegra_i2c_init_dma(struct tegra_i2c_dev *i2c_dev) {
>>> + struct dma_chan *dma_chan;
>>> + u32 *dma_buf;
>>> + dma_addr_t dma_phys;
>>> + int err = 0;
>>> +
>>> + if (!IS_ENABLED(CONFIG_TEGRA20_APB_DMA))
>>> + return -ENODEV;
>>
>> Driver shall not fail to probe if DMA driver is disabled, but to continue with the PIO-only mode available.
>>
>> Should be:
>>
>> if (!IS_ENABLED(CONFIG_TEGRA20_APB_DMA))
>> return 0;
>>
> Except EPROBE_DEFER, anything else returned from tegra_i2c_init_dma (ENODEV/ENOMEM) is ignored in i2c_probe
> DMA mode decision is based on xfer size and availability of dma channel or can be changed based on valid dma buf to shorten the line.
>
Ah, sorry. I missed that, seems good then.
next prev parent reply other threads:[~2019-02-01 19:22 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-01 17:07 [PATCH V9 1/5] i2c: tegra: sort all the include headers alphabetically Sowjanya Komatineni
2019-02-01 17:07 ` [PATCH V9 2/5] i2c: tegra: add bus clear master support Sowjanya Komatineni
2019-02-01 19:06 ` Dmitry Osipenko
2019-02-01 17:07 ` [PATCH V9 3/5] i2c: tegra: Add DMA support Sowjanya Komatineni
2019-02-01 18:57 ` Dmitry Osipenko
2019-02-01 19:20 ` Sowjanya Komatineni
2019-02-01 19:22 ` Dmitry Osipenko [this message]
2019-02-02 14:13 ` Dmitry Osipenko
2019-02-02 18:43 ` Sowjanya Komatineni
2019-02-03 16:42 ` Dmitry Osipenko
2019-02-01 20:21 ` Sowjanya Komatineni
2019-02-01 20:30 ` Dmitry Osipenko
2019-02-01 21:36 ` Sowjanya Komatineni
2019-02-01 21:45 ` Dmitry Osipenko
2019-02-02 14:01 ` Dmitry Osipenko
2019-02-02 18:32 ` Sowjanya Komatineni
2019-02-03 16:48 ` Dmitry Osipenko
2019-02-04 8:18 ` Thierry Reding
2019-02-03 14:19 ` Dmitry Osipenko
2019-02-03 14:47 ` Dmitry Osipenko
2019-02-03 15:27 ` Dmitry Osipenko
2019-02-04 12:57 ` Dmitry Osipenko
2019-02-05 1:37 ` Sowjanya Komatineni
2019-02-05 6:20 ` Dmitry Osipenko
2019-02-04 8:04 ` Thierry Reding
2019-02-01 17:07 ` [PATCH V9 4/5] i2c: tegra: update transfer timeout Sowjanya Komatineni
2019-02-01 19:16 ` Dmitry Osipenko
2019-02-01 19:37 ` Sowjanya Komatineni
2019-02-01 19:41 ` Dmitry Osipenko
2019-02-04 7:54 ` Thierry Reding
2019-02-01 17:07 ` [PATCH V9 5/5] i2c: tegra: add i2c interface timing support Sowjanya Komatineni
2019-02-01 19:05 ` [PATCH V9 1/5] i2c: tegra: sort all the include headers alphabetically Dmitry Osipenko
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