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authorSakari Ailus <sakari.ailus@linux.intel.com>2024-01-08 18:18:02 +0300
committerMauro Carvalho Chehab <mchehab@kernel.org>2024-02-01 15:41:05 +0300
commita68e88e2cf9e4f3bec1783d686beb2439f4a26e0 (patch)
tree835de5ad7cc2eba109dbf4fe75976fdb1fe37ced /include/media
parent45db5c214c71419f4ec41300c3b6a1d5e62cb042 (diff)
downloadlinux-a68e88e2cf9e4f3bec1783d686beb2439f4a26e0.tar.xz
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.h25
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)
{
/*