AFBC versions modifiers

[Ayan Halder]

Hi Neil,

AFBC 1.0 does not support (ignoring common prefix AFBC_FORMAT_MOD_) BLOCK_SIZE_32x8, BLOCK_SIZE_64x4, BLOCK_SIZE_32x8_64x4
CBR, TILED, SC, DB and BCH  modifiers.

AFBC 1.2 does not support BLOCK_SIZE_64x4, BLOCK_SIZE_32x8_64x4, DB and BCH modifiers.

Beyond that it's very hard to say. The AFBC version numbers refer to versions of the specification, but aren't very useful for describing the actual bitstream format.
To determine which modifiers _are_ supported, you will really need to get technical documentation from the SoC vendor

Regards,
Ayan Kumar Halder

________________________________
From: Neil Armstrong <narmstrong at baylibre.com>
Sent: Tuesday, February 26, 2019 2:15 PM
To: Ayan Halder; Liviu Dudau
Cc: DRI Development
Subject: AFBC versions modifiers

Hi Ayan,

Could you help distinguish which are the AFBC modifiers for each version of AFBC ?

The Amlogic SoCs embeds an AFBC 1.0 compatible decoder, then the newer SoCs embeds an AFBC 1.2 decoder,
I assume the modifiers before the patch "drm/fourcc: Add modifier defininitions for AFBC 1.3" are
valid for AFBC 1.2, but what is the subset for 1.0 and 1.1 ?

Thanks,
Neil

--
Neil Armstrong
Embedded Linux Software Engineer
BayLibre - At the Heart of Embedded Linux
www.baylibre.com<http://www.baylibre.com>
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