media: docs: split uAPI info from imx.rst

This file contains both driver develompent documentation and
userspace API.

Split on two, as they're usually read by different audiences.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

1 files changed, 2 insertions, 86 deletions

diff --git a/Documentation/media/v4l-drivers/imx.rst b/Documentation/media/v4l-drivers/imx.rst
index 1246573c1019..3182951c7651 100644
--- a/Documentation/media/v4l-drivers/imx.rst
+++ b/Documentation/media/v4l-drivers/imx.rst
@@ -191,14 +191,7 @@ or unqualified interlaced). The capture interface will enforce the same
 field order as the source pad field order (interlaced-bt if source pad
 is seq-bt, interlaced-tb if source pad is seq-tb).
 
-This subdev can generate the following event when enabling the second
-IDMAC source pad:
-
-- V4L2_EVENT_IMX_FRAME_INTERVAL_ERROR
-
-The user application can subscribe to this event from the ipuX_csiY
-subdev node. This event is generated by the Frame Interval Monitor
-(see below for more on the FIM).
+For events produced by ipuX_csiY, see ref:`imx_api_ipuX_csiY`.
 
 Cropping in ipuX_csiY
 ---------------------
@@ -247,84 +240,7 @@ rate by half at the IDMAC output source pad:
 Frame Interval Monitor in ipuX_csiY
 -----------------------------------
 
-The adv718x decoders can occasionally send corrupt fields during
-NTSC/PAL signal re-sync (too little or too many video lines). When
-this happens, the IPU triggers a mechanism to re-establish vertical
-sync by adding 1 dummy line every frame, which causes a rolling effect
-from image to image, and can last a long time before a stable image is
-recovered. Or sometimes the mechanism doesn't work at all, causing a
-permanent split image (one frame contains lines from two consecutive
-captured images).
-
-From experiment it was found that during image rolling, the frame
-intervals (elapsed time between two EOF's) drop below the nominal
-value for the current standard, by about one frame time (60 usec),
-and remain at that value until rolling stops.
-
-While the reason for this observation isn't known (the IPU dummy
-line mechanism should show an increase in the intervals by 1 line
-time every frame, not a fixed value), we can use it to detect the
-corrupt fields using a frame interval monitor. If the FIM detects a
-bad frame interval, the ipuX_csiY subdev will send the event
-V4L2_EVENT_IMX_FRAME_INTERVAL_ERROR. Userland can register with
-the FIM event notification on the ipuX_csiY subdev device node.
-Userland can issue a streaming restart when this event is received
-to correct the rolling/split image.
-
-The ipuX_csiY subdev includes custom controls to tweak some dials for
-FIM. If one of these controls is changed during streaming, the FIM will
-be reset and will continue at the new settings.
-
-- V4L2_CID_IMX_FIM_ENABLE
-
-Enable/disable the FIM.
-
-- V4L2_CID_IMX_FIM_NUM
-
-How many frame interval measurements to average before comparing against
-the nominal frame interval reported by the sensor. This can reduce noise
-caused by interrupt latency.
-
-- V4L2_CID_IMX_FIM_TOLERANCE_MIN
-
-If the averaged intervals fall outside nominal by this amount, in
-microseconds, the V4L2_EVENT_IMX_FRAME_INTERVAL_ERROR event is sent.
-
-- V4L2_CID_IMX_FIM_TOLERANCE_MAX
-
-If any intervals are higher than this value, those samples are
-discarded and do not enter into the average. This can be used to
-discard really high interval errors that might be due to interrupt
-latency from high system load.
-
-- V4L2_CID_IMX_FIM_NUM_SKIP
-
-How many frames to skip after a FIM reset or stream restart before
-FIM begins to average intervals.
-
-- V4L2_CID_IMX_FIM_ICAP_CHANNEL
-- V4L2_CID_IMX_FIM_ICAP_EDGE
-
-These controls will configure an input capture channel as the method
-for measuring frame intervals. This is superior to the default method
-of measuring frame intervals via EOF interrupt, since it is not subject
-to uncertainty errors introduced by interrupt latency.
-
-Input capture requires hardware support. A VSYNC signal must be routed
-to one of the i.MX6 input capture channel pads.
-
-V4L2_CID_IMX_FIM_ICAP_CHANNEL configures which i.MX6 input capture
-channel to use. This must be 0 or 1.
-
-V4L2_CID_IMX_FIM_ICAP_EDGE configures which signal edge will trigger
-input capture events. By default the input capture method is disabled
-with a value of IRQ_TYPE_NONE. Set this control to IRQ_TYPE_EDGE_RISING,
-IRQ_TYPE_EDGE_FALLING, or IRQ_TYPE_EDGE_BOTH to enable input capture,
-triggered on the given signal edge(s).
-
-When input capture is disabled, frame intervals will be measured via
-EOF interrupt.
-
+See ref:`imx_api_FIM`.
 
 ipuX_vdic
 ---------