Hi Jean-Michel, Just replying to CC Tian Shu as well. On Tue, Aug 31, 2021 at 08:51:40PM +0200, Jean-Michel Hautbois wrote: > While parsing the RAW AWB metadata, the AWB layout was missing to fully > understand which byte corresponds to which feature. Make the field names > and usage explicit, as it is used by the userspace applications. > > Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@xxxxxxxxxxxxxxxx> > --- > This structure layout is defined in CrOs: > https://chromium.googlesource.com/chromiumos/platform/arc-camera/+/refs/heads/master/hal/intel/include/ia_imaging/awb_public.h > > There are a few things not really understood right now: > - Is sat_ratio a full scale ratio (I can't get more than some values out > of it, is it a ratio of 25%, 50%, 75%, 100% ?) > - What are the real minimum and maximum values for the grid size ? From > CrOs it appears to be [16, 80] for width and [16, 60] for height while > in this file it seems to be [16, 160] for width and not really defined > for height AFAICT ? > - Same for the block_width_log2 and block_height_log2 which are [3, 7] > in this file and [3, 6] in the awb_public.h header ? > > .../media/ipu3/include/uapi/intel-ipu3.h | 38 ++++++++++++++----- > 1 file changed, 29 insertions(+), 9 deletions(-) > > diff --git a/drivers/staging/media/ipu3/include/uapi/intel-ipu3.h b/drivers/staging/media/ipu3/include/uapi/intel-ipu3.h > index fa3d6ee5adf2..83191aff2ddd 100644 > --- a/drivers/staging/media/ipu3/include/uapi/intel-ipu3.h > +++ b/drivers/staging/media/ipu3/include/uapi/intel-ipu3.h > @@ -61,20 +61,40 @@ struct ipu3_uapi_grid_config { > __u16 y_end; > } __packed; > > +/** > + * struct ipu3_uapi_awb_raw_buffer - Memory layout for each cell in AWB > + * > + * @Gr_avg: Green average for red lines in the cell. > + * @R_avg: Red average in the cell. > + * @B_avg: Blue average in the cell. > + * @Gb_avg: Green average for blue lines in the cell. > + * @sat_ratio: Saturation ratio in the cell. > + * @padding0: Unused byte for padding. > + * @padding1: Unused byte for padding. > + * @padding2: Unused byte for padding. > + */ > +struct ipu3_uapi_awb_raw_buffer { > + unsigned char Gr_avg; > + unsigned char R_avg; > + unsigned char B_avg; > + unsigned char Gb_avg; > + unsigned char sat_ratio; > + unsigned char padding0; > + unsigned char padding1; > + unsigned char padding2; > +} __packed; > + > /* > * The grid based data is divided into "slices" called set, each slice of setX > * refers to ipu3_uapi_grid_config width * height_per_slice. > */ > #define IPU3_UAPI_AWB_MAX_SETS 60 > -/* Based on grid size 80 * 60 and cell size 16 x 16 */ > -#define IPU3_UAPI_AWB_SET_SIZE 1280 > -#define IPU3_UAPI_AWB_MD_ITEM_SIZE 8 > -#define IPU3_UAPI_AWB_SPARE_FOR_BUBBLES \ > - (IPU3_UAPI_MAX_BUBBLE_SIZE * IPU3_UAPI_MAX_STRIPES * \ > - IPU3_UAPI_AWB_MD_ITEM_SIZE) > +#define AWB_PUBLIC_NUM_OF_ITEMS_IN_SET 160 > +/* Based on max grid height + Spare for bubbles */ > +#define AWB_PUBLIC_NUM_OF_SETS_IN_BUFFER IPU3_UAPI_AWB_MAX_SETS + \ > + (IPU3_UAPI_MAX_BUBBLE_SIZE * IPU3_UAPI_MAX_STRIPES) > #define IPU3_UAPI_AWB_MAX_BUFFER_SIZE \ > - (IPU3_UAPI_AWB_MAX_SETS * \ > - (IPU3_UAPI_AWB_SET_SIZE + IPU3_UAPI_AWB_SPARE_FOR_BUBBLES)) > + AWB_PUBLIC_NUM_OF_SETS_IN_BUFFER * AWB_PUBLIC_NUM_OF_ITEMS_IN_SET > > /** > * struct ipu3_uapi_awb_raw_buffer - AWB raw buffer > @@ -83,7 +103,7 @@ struct ipu3_uapi_grid_config { > * the average values for each color channel. > */ > struct ipu3_uapi_awb_raw_buffer { > - __u8 meta_data[IPU3_UAPI_AWB_MAX_BUFFER_SIZE] > + struct ipu3_uapi_awb_raw_buffer meta_data[IPU3_UAPI_AWB_MAX_BUFFER_SIZE] > __attribute__((aligned(32))); > } __packed; > -- Regards, Laurent Pinchart
