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Date: Tue, 25 Feb 2020 21:50:18 -0800
From: Sowjanya Komatineni <skomatineni@...dia.com>
To: Hans Verkuil <hverkuil@...all.nl>, <thierry.reding@...il.com>,
<jonathanh@...dia.com>, <frankc@...dia.com>,
<helen.koike@...labora.com>, <sboyd@...nel.org>
CC: <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-clk@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v3 4/6] media: tegra: Add Tegra210 Video input driver
On 2/25/20 8:49 PM, Sowjanya Komatineni wrote:
>
> On 2/20/20 4:44 AM, Hans Verkuil wrote:
>> External email: Use caution opening links or attachments
>>
>>
>> Hi Sowjanya,
>>
>> Some code review comments below:
>>
>> On 2/14/20 7:23 PM, Sowjanya Komatineni wrote:
>>> Tegra210 contains a powerful Video Input (VI) hardware controller
>>> which can support up to 6 MIPI CSI camera sensors.
>>>
>>> Each Tegra CSI port can be one-to-one mapped to VI channel and can
>>> capture from an external camera sensor connected to CSI or from
>>> built-in test pattern generator.
>>>
>>> Tegra210 supports built-in test pattern generator from CSI to VI.
>>>
>>> This patch adds a V4L2 media controller and capture driver support
>>> for Tegra210 built-in CSI to VI test pattern generator.
>>>
>>> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>
>>> ---
>>> drivers/staging/media/Kconfig | 2 +
>>> drivers/staging/media/Makefile | 1 +
>>> drivers/staging/media/tegra/Kconfig | 10 +
>>> drivers/staging/media/tegra/Makefile | 8 +
>>> drivers/staging/media/tegra/TODO | 10 +
>>> drivers/staging/media/tegra/tegra-common.h | 239 +++++++
>>> drivers/staging/media/tegra/tegra-csi.c | 374 ++++++++++
>>> drivers/staging/media/tegra/tegra-csi.h | 115 ++++
>>> drivers/staging/media/tegra/tegra-vi.c | 1019
>>> ++++++++++++++++++++++++++++
>>> drivers/staging/media/tegra/tegra-vi.h | 79 +++
>>> drivers/staging/media/tegra/tegra-video.c | 118 ++++
>>> drivers/staging/media/tegra/tegra-video.h | 32 +
>>> drivers/staging/media/tegra/tegra210.c | 767
>>> +++++++++++++++++++++
>>> drivers/staging/media/tegra/tegra210.h | 190 ++++++
>>> 14 files changed, 2964 insertions(+)
>>> create mode 100644 drivers/staging/media/tegra/Kconfig
>>> create mode 100644 drivers/staging/media/tegra/Makefile
>>> create mode 100644 drivers/staging/media/tegra/TODO
>>> create mode 100644 drivers/staging/media/tegra/tegra-common.h
>>> create mode 100644 drivers/staging/media/tegra/tegra-csi.c
>>> create mode 100644 drivers/staging/media/tegra/tegra-csi.h
>>> create mode 100644 drivers/staging/media/tegra/tegra-vi.c
>>> create mode 100644 drivers/staging/media/tegra/tegra-vi.h
>>> create mode 100644 drivers/staging/media/tegra/tegra-video.c
>>> create mode 100644 drivers/staging/media/tegra/tegra-video.h
>>> create mode 100644 drivers/staging/media/tegra/tegra210.c
>>> create mode 100644 drivers/staging/media/tegra/tegra210.h
>>>
>
>>> +static int chan_capture_kthread_done(void *data)
>>> +{
>>> + struct tegra_vi_channel *chan = data;
>>> + struct tegra_channel_buffer *buf;
>>> +
>>> + set_freezable();
>>> +
>>> + while (1) {
>>> + try_to_freeze();
>>> +
>>> + wait_event_interruptible(chan->done_wait,
>>> + !list_empty(&chan->done) ||
>>> + kthread_should_stop());
>>> +
>>> + if (kthread_should_stop())
>>> + break;
>> I think it makes more sense if this test is moved to the end...
>>
>>> +
>>> + buf = dequeue_buf_done(chan);
>>> + if (!buf)
>>> + continue;
>> ... and this becomes:
>>
>> if (buf)
>>> + tegra_channel_capture_done(chan, buf);
>> This change simplifies stop_streaming (see below).
>
> With kthread_should_stop check at end, I see sometimes outstanding
> buffer in done queue by the time threads are stopped during stream stop.
>
> When I run compliance stream io tests continuously in loop, depending
> on time of stream stop request capture thread terminated after
> initiating frame capture and moving buffer to done queue while done
> thread was still in wait for previous MW_ACK and on seeing
> kthread_should_stop done thread terminated with last buffer left in
> done queue.
>
> So looks like we need to keep checking for outstanding buffer and
> handle it during stop streaming like in v3.
>
Will change in v4 to handle all pending done queue buffers before
terminating thread.
>
>>> + }
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +int tegra210_vi_start_streaming(struct vb2_queue *vq, u32 count)
>>> +{
>>> + struct tegra_vi_channel *chan = vb2_get_drv_priv(vq);
>>> + struct media_pipeline *pipe = &chan->video.pipe;
>>> + int ret = 0;
>>> +
>>> + tegra_vi_write(chan, TEGRA_VI_CFG_CG_CTRL, VI_CG_2ND_LEVEL_EN);
>>> +
>>> + /* clear errors */
>>> + vi_csi_write(chan, TEGRA_VI_CSI_ERROR_STATUS, 0xFFFFFFFF);
>>> +
>>> + /*
>>> + * Sync point FIFO full stalls the host interface.
>>> + * Setting NO_STALL will drop INCR_SYNCPT methods when fifos are
>>> + * full and the corresponding condition bits in INCR_SYNCPT_ERROR
>>> + * register will be set.
>>> + * This allows SW to process error recovery.
>>> + */
>>> + tegra_vi_write(chan, TEGRA_VI_CFG_VI_INCR_SYNCPT_CNTRL,
>>> + TEGRA_VI_CFG_VI_INCR_SYNCPT_NO_STALL);
>>> +
>>> + /* start the pipeline */
>>> + ret = media_pipeline_start(&chan->video.entity, pipe);
>>> + if (ret < 0)
>>> + goto error_pipeline_start;
>>> +
>>> + /* program VI registers after TPG, sensors and CSI streaming */
>>> + ret = tegra_channel_set_stream(chan, true);
>>> + if (ret < 0)
>>> + goto error_set_stream;
>>> +
>>> + tegra_channel_capture_setup(chan);
>>> +
>>> + chan->sequence = 0;
>>> +
>>> + /* start kthreads to capture data to buffer and return them */
>>> + chan->kthread_capture_done =
>>> kthread_run(chan_capture_kthread_done,
>>> + chan, "%s:1",
>>> + chan->video.name);
>>> + if (IS_ERR(chan->kthread_capture_done)) {
>>> + ret = PTR_ERR(chan->kthread_capture_done);
>>> + chan->kthread_capture_done = NULL;
>>> + dev_err(&chan->video.dev,
>>> + "failed capture done kthread: %d\n", ret);
>>> + goto error_kthread_done;
>>> + }
>>> +
>>> + chan->kthread_capture_start =
>>> kthread_run(chan_capture_kthread_start,
>>> + chan, "%s:0",
>>> + chan->video.name);
>>> + if (IS_ERR(chan->kthread_capture_start)) {
>>> + ret = PTR_ERR(chan->kthread_capture_start);
>>> + chan->kthread_capture_start = NULL;
>>> + dev_err(&chan->video.dev,
>>> + "failed capture start kthread: %d\n", ret);
>>> + goto error_kthread_start;
>>> + }
>>> +
>>> + return 0;
>>> +
>>> +error_kthread_start:
>>> + kthread_stop(chan->kthread_capture_done);
>>> +error_kthread_done:
>>> + tegra_channel_set_stream(chan, false);
>>> +error_set_stream:
>>> + media_pipeline_stop(&chan->video.entity);
>>> +error_pipeline_start:
>>> + vq->start_streaming_called = 0;
>>> + tegra_channel_release_queued_buffers(chan, VB2_BUF_STATE_QUEUED);
>>> + return ret;
>>> +}
>>> +
>>> +void tegra210_vi_stop_streaming(struct vb2_queue *vq)
>>> +{
>>> + struct tegra_vi_channel *chan = vb2_get_drv_priv(vq);
>>> + struct tegra_channel_buffer *buf;
>>> +
>>> + if (!chan->kthread_capture_start || !chan->kthread_capture_done)
>>> + return;
>>> +
>>> + kthread_stop(chan->kthread_capture_start);
>>> + chan->kthread_capture_start = NULL;
>>> + kthread_stop(chan->kthread_capture_done);
>>> + chan->kthread_capture_done = NULL;
>>> +
>> With the change in chan_capture_kthread_done() as described above you
>> can
>> drop the next 4 lines since that's guaranteed to be done by the thread.
>>
>>> + /* wait for last frame MW_ACK_DONE */
>>> + buf = dequeue_buf_done(chan);
>>> + if (buf)
>>> + tegra_channel_capture_done(chan, buf);
>>> +
>>> + tegra_channel_release_queued_buffers(chan, VB2_BUF_STATE_ERROR);
>>> +
>>> + tegra_channel_set_stream(chan, false);
>>> +
>>> + /* disable clock gating to enable continuous clock */
>>> + tegra_vi_write(chan, TEGRA_VI_CFG_CG_CTRL, 0);
>>> +
>>> + /* reset VI MCIF, PF, SENSORCTL, and SHADOW logic */
>>> + vi_csi_write(chan, TEGRA_VI_CSI_SW_RESET, 0xF);
>>> + vi_csi_write(chan, TEGRA_VI_CSI_SW_RESET, 0x0);
>>> + vi_csi_write(chan, TEGRA_VI_CSI_IMAGE_DEF, 0);
>>> +
>>> + /* enable clock gating so VI can be clock gated if necessary */
>>> + tegra_vi_write(chan, TEGRA_VI_CFG_CG_CTRL, VI_CG_2ND_LEVEL_EN);
>>> + vi_csi_write(chan, TEGRA_VI_CSI_ERROR_STATUS, 0xFFFFFFFF);
>>> +
>>> + media_pipeline_stop(&chan->video.entity);
>>> +}
>>> +
>>> +void tegra210_csi_error_recover(struct tegra_csi_channel *csi_chan)
>>
>> Regards,
>>
>> Hans
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