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media: meson: vdec: add helpers for lossless framebuffer compression buffers

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Add helpers to support the lossless framebuffer compression format that
will be used in HEVC & VP9 decoders when decoding 10bit content for
downsampling to 8bit NV12 and later proper compressed buffer support.

Signed-off-by: Maxime Jourdan <mjourdan@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Maxime Jourdan 2020-03-04 10:46:22 +01:00 committed by Mauro Carvalho Chehab
parent 7624c9cd5b
commit 09b455d1da
2 changed files with 31 additions and 0 deletions
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27
drivers/staging/media/meson/vdec/vdec_helpers.c
View file

@ -50,6 +50,33 @@ void amvdec_write_parser(struct amvdec_core *core, u32 reg, u32 val)
}
EXPORT_SYMBOL_GPL(amvdec_write_parser);
/* 4 KiB per 64x32 block */
u32 amvdec_am21c_body_size(u32 width, u32 height)
{
u32 width_64 = ALIGN(width, 64) / 64;
u32 height_32 = ALIGN(height, 32) / 32;
return SZ_4K * width_64 * height_32;
}
EXPORT_SYMBOL_GPL(amvdec_am21c_body_size);
/* 32 bytes per 128x64 block */
u32 amvdec_am21c_head_size(u32 width, u32 height)
{
u32 width_128 = ALIGN(width, 128) / 128;
u32 height_64 = ALIGN(height, 64) / 64;
return 32 * width_128 * height_64;
}
EXPORT_SYMBOL_GPL(amvdec_am21c_head_size);
u32 amvdec_am21c_size(u32 width, u32 height)
{
return ALIGN(amvdec_am21c_body_size(width, height) +
amvdec_am21c_head_size(width, height), SZ_64K);
}
EXPORT_SYMBOL_GPL(amvdec_am21c_size);
static int canvas_alloc(struct amvdec_session *sess, u8 *canvas_id)
{
int ret;

4
drivers/staging/media/meson/vdec/vdec_helpers.h
View file

@ -27,6 +27,10 @@ void amvdec_clear_dos_bits(struct amvdec_core *core, u32 reg, u32 val);
u32 amvdec_read_parser(struct amvdec_core *core, u32 reg);
void amvdec_write_parser(struct amvdec_core *core, u32 reg, u32 val);
u32 amvdec_am21c_body_size(u32 width, u32 height);
u32 amvdec_am21c_head_size(u32 width, u32 height);
u32 amvdec_am21c_size(u32 width, u32 height);
/**
* amvdec_dst_buf_done_idx() - Signal that a buffer is done decoding
*