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>
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2 changed files with 72 additions and 0 deletions
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@ -585,3 +585,50 @@ u32 v4l2_fraction_to_interval(u32 numerator, u32 denominator)
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return denominator ? numerator * multiplier / denominator : 0;
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}
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EXPORT_SYMBOL_GPL(v4l2_fraction_to_interval);
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int v4l2_link_freq_to_bitmap(struct device *dev, const u64 *fw_link_freqs,
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unsigned int num_of_fw_link_freqs,
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const s64 *driver_link_freqs,
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unsigned int num_of_driver_link_freqs,
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unsigned long *bitmap)
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{
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unsigned int i;
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*bitmap = 0;
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if (!num_of_fw_link_freqs) {
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dev_err(dev, "no link frequencies in firmware\n");
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return -ENODATA;
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}
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for (i = 0; i < num_of_fw_link_freqs; i++) {
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unsigned int j;
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for (j = 0; j < num_of_driver_link_freqs; j++) {
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if (fw_link_freqs[i] != driver_link_freqs[j])
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continue;
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dev_dbg(dev, "enabling link frequency %lld Hz\n",
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driver_link_freqs[j]);
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*bitmap |= BIT(j);
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break;
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}
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}
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if (!*bitmap) {
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dev_err(dev, "no matching link frequencies found\n");
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dev_dbg(dev, "specified in firmware:\n");
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for (i = 0; i < num_of_fw_link_freqs; i++)
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dev_dbg(dev, "\t%llu Hz\n", fw_link_freqs[i]);
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dev_dbg(dev, "driver supported:\n");
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for (i = 0; i < num_of_driver_link_freqs; i++)
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dev_dbg(dev, "\t%lld Hz\n", driver_link_freqs[i]);
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return -ENOENT;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(v4l2_link_freq_to_bitmap);
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@ -547,6 +547,31 @@ void v4l2_simplify_fraction(u32 *numerator, u32 *denominator,
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unsigned int n_terms, unsigned int threshold);
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u32 v4l2_fraction_to_interval(u32 numerator, u32 denominator);
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/**
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* v4l2_link_freq_to_bitmap - Figure out platform-supported link frequencies
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* @dev: The struct device
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* @fw_link_freqs: Array of link frequencies from firmware
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* @num_of_fw_link_freqs: Number of entries in @fw_link_freqs
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* @driver_link_freqs: Array of link frequencies supported by the driver
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* @num_of_driver_link_freqs: Number of entries in @driver_link_freqs
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* @bitmap: Bitmap of driver-supported link frequencies found in @fw_link_freqs
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*
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* This function checks which driver-supported link frequencies are enabled in
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* system firmware and sets the corresponding bits in @bitmap (after first
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* zeroing it).
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*
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* Return values:
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* 0: Success
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* -ENOENT: No match found between driver-supported link frequencies and
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* those available in firmware.
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* -ENODATA: No link frequencies were specified in firmware.
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*/
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int v4l2_link_freq_to_bitmap(struct device *dev, const u64 *fw_link_freqs,
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unsigned int num_of_fw_link_freqs,
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const s64 *driver_link_freqs,
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unsigned int num_of_driver_link_freqs,
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unsigned long *bitmap);
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static inline u64 v4l2_buffer_get_timestamp(const struct v4l2_buffer *buf)
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{
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/*
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