On 12. 06. 23 10:51, Hans Verkuil wrote:
On 08/06/2023 17:30, Martin Tůma wrote:
On 08. 06. 23 12:23, Hans Verkuil wrote:
Can you make a list of which sysfs properties correspond to existing V4L2
format or timing fields and which are 'new'?
On the left all the current mgb4 sysfs properties (see the admin-guide doc from the patch for description), on the right v4l2 structures where they could be mapped (may not be true for all of them in
the patch, I will check it and update the code in v7)
--- PCIE CARD ---
module_type -
module_version -
fw_type -
fw_version -
serial_number -
temperature hwmon
--- INPUTS ---
input_id -
oldi_lane_width -
color_mapping -
link_status v4l2_input.status (V4L2_IN_ST_NO_SYNC)
stream_status v4l2_input.status (V4L2_IN_ST_NO_SIGNAL)
video_width v4l2_bt_timings.width
video_height v4l2_bt_timings.height
vsync_status v4l2_bt_timings.polarities
hsync_status v4l2_bt_timings.polarities
vsync_gap_length -
hsync_gap_length -
pclk_frequency v4l2_bt_timings.pixelclock
hsync_width v4l2_bt_timings.hsync
vsync_width v4l2_bt_timings.vsync
hback_porch v4l2_bt_timings.hbackporch
hfront_porch v4l2_bt_timings.hfrontporch
vback_porch v4l2_bt_timings.vbackporch
vfront_porch v4l2_bt_timings.vfrontporch
frequency_range -
alignment v4l2_pix_format.bytesperline
fpdl3_input_width -
gmsl_mode -
gmsl_stream_id -
gmsl_fec -
--- OUTPUTS ---
output_id -
video_source -
display_width v4l2_bt_timings.width
display_height v4l2_bt_timings.height
frame_rate v4l2_frmivalenum
The frame rate is a property of the width/height+blanking and the
pixel clock frequency. IMHO it does not make sense to have this as
a writable property. Read-only is OK.
hsync_polarity v4l2_bt_timings.polarities
vsync_polarity v4l2_bt_timings.polarities
de_polarity -
pclk_frequency v4l2_bt_timings.pixelclock
hsync_width v4l2_bt_timings.hsync
vsync_width v4l2_bt_timings.vsync
vsync_width v4l2_bt_timings.vsync
hback_porch v4l2_bt_timings.hbackporch
hfront_porch v4l2_bt_timings.hfrontporch
vback_porch v4l2_bt_timings.vbackporch
vfront_porch v4l2_bt_timings.vfrontporch
alignment v4l2_pix_format.bytesperline
fpdl3_output_width -
M.
The property I am most concerned with is alignment (both for input and output).
But it is not clear to me what the use-case is.
Hi,
The use-case is to provide the alignment required by some video
processing chips. We have a product based on NVIDIA Jetson TX2 that uses
the mgb4 cards and the HW video encoding needs a specific alignment to
work.
M.
Regards,
Hans
