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| author |   Sakari Ailus <sakari.ailus@linux.intel.com> | 2020-10-13 16:54:00 +0200 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab+huawei@kernel.org> | 2020-11-16 10:31:15 +0100 |
| commit | 1b888b3cebef2de3936167e95652830145040b78 (patch) | |
| tree | bfa5899ca4a319b960f44d40aebf3756c36fb514 /include/media | |
| parent | media: Documentation: v4l: Document required controls on camera sensors (diff) | |
| download | linux-dev-1b888b3cebef2de3936167e95652830145040b78.tar.xz linux-dev-1b888b3cebef2de3936167e95652830145040b78.zip | |
media: v4l: Add a helper for obtaining the link frequency
Add a helper for obtaining the link frequency from transmitter drivers.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/v4l2-common.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h index a3083529b698..be36cbdcc1bd 100644 --- a/include/media/v4l2-common.h +++ b/include/media/v4l2-common.h @@ -519,6 +519,27 @@ int v4l2_fill_pixfmt(struct v4l2_pix_format *pixfmt, u32 pixelformat, int v4l2_fill_pixfmt_mp(struct v4l2_pix_format_mplane *pixfmt, u32 pixelformat, u32 width, u32 height); +/** + * v4l2_get_link_rate - Get link rate from transmitter + * + * @handler: The transmitter's control handler + * @mul: The multiplier between pixel rate and link frequency. Bits per pixel on + * D-PHY, samples per clock on parallel. 0 otherwise. + * @div: The divisor between pixel rate and link frequency. Number of data lanes + * times two on D-PHY, 1 on parallel. 0 otherwise. + * + * This function is intended for obtaining the link frequency from the + * transmitter sub-devices. It returns the link rate, either from the + * V4L2_CID_LINK_FREQ control implemented by the transmitter, or value + * calculated based on the V4L2_CID_PIXEL_RATE implemented by the transmitter. + * + * Returns link frequency on success, otherwise a negative error code: + * -ENOENT: Link frequency or pixel rate control not found + * -EINVAL: Invalid link frequency value + */ +s64 v4l2_get_link_rate(struct v4l2_ctrl_handler *handler, unsigned int mul, + unsigned int div); + static inline u64 v4l2_buffer_get_timestamp(const struct v4l2_buffer *buf) { /* |