diff options
Diffstat (limited to 'drivers/staging/media')
| -rw-r--r-- | drivers/staging/media/ipu3/TODO | 2 | ||||
| -rw-r--r-- | drivers/staging/media/ipu3/include/intel-ipu3.h | 5 |
2 files changed, 5 insertions, 2 deletions
diff --git a/drivers/staging/media/ipu3/TODO b/drivers/staging/media/ipu3/TODO index 1fae569c7a48..7f7a2e958a86 100644 --- a/drivers/staging/media/ipu3/TODO +++ b/drivers/staging/media/ipu3/TODO @@ -12,8 +12,6 @@ staging directory. Comments on configuring v4l2 subdevs for CIO2 and ImgU. - uAPI documentation: - Further clarification on some ambiguities such as data type conversion of - IEFD CU inputs. (Sakari) Move acronyms to doc-rst file. (Mauro) - Switch to yavta from v4l2n in driver docs. diff --git a/drivers/staging/media/ipu3/include/intel-ipu3.h b/drivers/staging/media/ipu3/include/intel-ipu3.h index c7cd27efac8a..08eaa0bad0de 100644 --- a/drivers/staging/media/ipu3/include/intel-ipu3.h +++ b/drivers/staging/media/ipu3/include/intel-ipu3.h @@ -1217,6 +1217,11 @@ struct ipu3_uapi_shd_config { * * All CU inputs are unsigned, they will be converted to signed when written * to register, i.e. a01 will be written to 9 bit register in s4.4 format. + * The data precision s4.4 means 4 bits for integer parts and 4 bits for the + * fractional part, the first bit indicates positive or negative value. + * For userspace software (commonly the imaging library), the computation for + * the CU slope values should be based on the slope resolution 1/16 (binary + * 0.0001 - the minimal interval value), the slope value range is [-256, +255]. * This applies to &ipu3_uapi_iefd_cux6_ed, &ipu3_uapi_iefd_cux2_1, * &ipu3_uapi_iefd_cux2_1, &ipu3_uapi_iefd_cux4 and &ipu3_uapi_iefd_cux6_rad. */ |