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Basic replace below logic and enhance to any 2^[0..31] in drivers/media/platform/nxp/imx-mipi-csis.c mipi_csis_set_fmt( { ... switch (csis_fmt->width % 8) { case 0: align = 0; break; case 4: align = 1; break; case 2: case 6: align = 2; break; default: /* 1, 3, 5, 7 */ align = 3; break; } ... } Signed-off-by: Frank Li --- changes in v4 - new patch --- include/media/v4l2-common.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/include/media/v4l2-common.h b/include/media/v4l2-common.h index 0a43f56578bce1896cf63e29dd19f58ec0c46bed..a861d83bcd835dc854476b25919383415e5d434f 100644 --- a/include/media/v4l2-common.h +++ b/include/media/v4l2-common.h @@ -669,4 +669,34 @@ static inline bool v4l2_is_quant_valid(__u8 quantization) quantization == V4L2_QUANTIZATION_LIM_RANGE; } +/** + * v4l_get_required_align_by_bpp - get align requirement for + * v4l_bound_align_image(). (bpp * width) % (1 << align) have to be 0. + * given number bpp, get width's alignment requirement. For example, + * if align is 3, means require bpp * width must be multiples of 8. + * bpp return width's requirememnt + * 0 0 none + * 1 3 8 (need 3 zero bits) + * 2 2 4 + * 3 3 8 + * 4 1 2 + * 5 3 8 + * 6 2 4 + * 7 3 8 + * @bpp: input bpp + * @align: expected alignment, 2^(align). + * + * return: required alignment. + */ +static inline u32 v4l_get_required_align_by_bpp(u32 bpp, u32 align) +{ + int pos; + + if (bpp == 0) + return 0; + + pos = ffs(bpp) - 1; + return pos > align ? 0 : align - pos; +} + #endif /* V4L2_COMMON_H_ */ -- 2.34.1