31.07.2020 18:46, Sowjanya Komatineni пишет:
>
> On 7/31/20 4:39 AM, Dmitry Osipenko wrote:
>> 31.07.2020 12:02, Sowjanya Komatineni пишет:
>> ...
>>> @@ -249,13 +249,47 @@ static int tegra_csi_enable_stream(struct
>>> v4l2_subdev *subdev)
>>> return ret;
>>> }
>>> + if (csi_chan->mipi) {
>>> + ret = tegra_mipi_enable(csi_chan->mipi);
>>> + if (ret < 0) {
>>> + dev_err(csi->dev,
>>> + "failed to enable MIPI pads: %d\n", ret);
>>> + goto rpm_put;
>>> + }
>>> +
>>> + /*
>>> + * CSI MIPI pads PULLUP, PULLDN and TERM impedances need to
>>> + * be calibrated after power on.
>>> + * So, trigger the calibration start here and results will
>>> + * be latched and applied to the pads when link is in LP11
>>> + * state during start of sensor streaming.
>>> + */
>>> + ret = tegra_mipi_start_calibration(csi_chan->mipi);
>>> + if (ret < 0) {
>>> + dev_err(csi->dev,
>>> + "failed to start MIPI calibration: %d\n", ret);
>>> + goto disable_mipi;
>>> + }
>> What would happen if CSI stream is enabled and then immediately disabled
>> without enabling camera sensor?
>
> Nothing will happen as during stream enable csi receiver is kept ready.
>
> But actual capture will not happen during that point.
Could you please show how the full call chain looks like? It's not clear
to me what keeps CSI stream "ready".
