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| author |  Sakari Ailus <sakari.ailus@linux.intel.com>
| 2024-01-08 16:18:02 +0100 |
|---|---|---|
| committer |  Mauro Carvalho Chehab <mchehab@kernel.org>
| 2024-02-01 13:41:05 +0100 |
| commit | a68e88e2cf9e4f3bec1783d686beb2439f4a26e0 (patch) | |
| tree | 835de5ad7cc2eba109dbf4fe75976fdb1fe37ced /include/media | |
| parent | media: i2c: isl7998x: convert to use maple tree register cache (diff) | |
| download | linux-a68e88e2cf9e4f3bec1783d686beb2439f4a26e0.tar.gz linux-a68e88e2cf9e4f3bec1783d686beb2439f4a26e0.tar.bz2 linux-a68e88e2cf9e4f3bec1783d686beb2439f4a26e0.zip | |
media: v4l: Add a helper for setting up link-frequencies control
Add a helper for obtaining supported link frequencies in form most drivers
need them. The result is a bitmap of supported controls.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Diffstat (limited to 'include/media')
| -rw-r--r-- | include/media/v4l2-common.h | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h index acf5be24a5ca..cd2163f24f8a 100644 --- a/include/media/v4l2-common.h +++ b/include/media/v4l2-common.h @@ -547,6 +547,31 @@ void v4l2_simplify_fraction(u32 *numerator, u32 *denominator, unsigned int n_terms, unsigned int threshold); u32 v4l2_fraction_to_interval(u32 numerator, u32 denominator); +/** + * v4l2_link_freq_to_bitmap - Figure out platform-supported link frequencies + * @dev: The struct device + * @fw_link_freqs: Array of link frequencies from firmware + * @num_of_fw_link_freqs: Number of entries in @fw_link_freqs + * @driver_link_freqs: Array of link frequencies supported by the driver + * @num_of_driver_link_freqs: Number of entries in @driver_link_freqs + * @bitmap: Bitmap of driver-supported link frequencies found in @fw_link_freqs + * + * This function checks which driver-supported link frequencies are enabled in + * system firmware and sets the corresponding bits in @bitmap (after first + * zeroing it). + * + * Return values: + * 0: Success + * -ENOENT: No match found between driver-supported link frequencies and + * those available in firmware. + * -ENODATA: No link frequencies were specified in firmware. + */ +int v4l2_link_freq_to_bitmap(struct device *dev, const u64 *fw_link_freqs, + unsigned int num_of_fw_link_freqs, + const s64 *driver_link_freqs, + unsigned int num_of_driver_link_freqs, + unsigned long *bitmap); + static inline u64 v4l2_buffer_get_timestamp(const struct v4l2_buffer *buf) { /* |