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media: Documentation: media: Update pixel rate formula for C-PHY 

Update the formula to calculate the pixel rate on the link for C-PHY.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Sakari Ailus 2020-12-11 23:15:04 +01:00 committed by Mauro Carvalho Chehab
parent 38c2230818
commit 44c1febd7e
1 changed files with 3 additions and 1 deletions
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4
Documentation/driver-api/media/csi2.rst
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@ -35,7 +35,7 @@ ability to start and stop the stream.
The value of the V4L2_CID_PIXEL_RATE is calculated as follows::
pixel_rate = link_freq * 2 * nr_of_lanes / bits_per_sample
pixel_rate = link_freq * 2 * nr_of_lanes * 16 / k / bits_per_sample
where
@ -53,6 +53,8 @@ where
- Two bits are transferred per clock cycle per lane.
* - bits_per_sample
- Number of bits per sample.
* - k
- 16 for D-PHY and 7 for C-PHY
The transmitter drivers must, if possible, configure the CSI-2
transmitter to *LP-11 mode* whenever the transmitter is powered on but