From: Kevin Hilman <khilman@baylibre.com>
To: Neil Armstrong <narmstrong@baylibre.com>,
daniel@ffwll.ch, dri-devel@lists.freedesktop.org
Cc: linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, jianxin.pan@amlogic.com,
Neil Armstrong <narmstrong@baylibre.com>
Subject: Re: [PATCH v8 0/6] drm/meson: add support for Amlogic Video FBC
Date: Thu, 02 Jul 2020 11:57:38 -0700 [thread overview]
Message-ID: <7himf5iw2l.fsf@baylibre.com> (raw)
In-Reply-To: <20200702074759.32356-1-narmstrong@baylibre.com>
Neil Armstrong <narmstrong@baylibre.com> writes:
> Amlogic uses a proprietary lossless image compression protocol and format
> for their hardware video codec accelerators, either video decoders or
> video input encoders.
>
> It considerably reduces memory bandwidth while writing and reading
> frames in memory.
>
> The underlying storage is considered to be 3 components, 8bit or 10-bit
> per component, YCbCr 420, single plane :
> - DRM_FORMAT_YUV420_8BIT
> - DRM_FORMAT_YUV420_10BIT
>
> This modifier will be notably added to DMA-BUF frames imported from the V4L2
> Amlogic VDEC decoder.
>
> At least two layout are supported :
> - Basic: composed of a body and a header
> - Scatter: the buffer is filled with a IOMMU scatter table referring
> to the encoder current memory layout. This mode if more efficient in terms
> of memory allocation but frames are not dumpable and only valid during until
> the buffer is freed and back in control of the encoder
>
> At least two options are supported :
> - Memory saving: when the pixel bpp is 8b, the size of the superblock can
> be reduced, thus saving memory.
>
> This serie adds the missing register, updated the FBC decoder registers
> content to be committed by the crtc code.
>
> The Amlogic FBC has been tested with compressed content from the Amlogic
> HW VP9 decoder on S905X (GXL), S905D2 (G12A) and S905X3 (SM1) in 8bit
> (Scatter+Mem Saving on G12A/SM1, Mem Saving on GXL) and 10bit
> (Scatter on G12A/SM1, default on GXL).
>
> It's expected to work as-is on GXM and G12B SoCs.
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Kevin
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
prev parent reply other threads:[~2020-07-02 18:58 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-02 7:47 [PATCH v8 0/6] drm/meson: add support for Amlogic Video FBC Neil Armstrong
2020-07-02 7:47 ` [PATCH v8 1/6] drm/fourcc: Add modifier definitions for describing Amlogic Video Framebuffer Compression Neil Armstrong
2020-07-02 9:23 ` Simon Ser
2020-07-02 13:18 ` Daniel Vetter
2020-07-02 13:34 ` Neil Armstrong
2020-07-02 14:15 ` Daniel Vetter
2020-07-02 15:11 ` Neil Armstrong
2020-07-02 18:03 ` Daniel Vetter
2020-07-02 7:47 ` [PATCH v8 2/6] drm/meson: add Amlogic Video FBC registers Neil Armstrong
2020-07-02 7:47 ` [PATCH v8 3/6] drm/meson: overlay: setup overlay for Amlogic FBC Neil Armstrong
2020-07-02 7:47 ` [PATCH v8 4/6] drm/meson: overlay: setup overlay for Amlogic FBC Memory Saving mode Neil Armstrong
2020-07-02 7:47 ` [PATCH v8 5/6] drm/meson: overlay: setup overlay for Amlogic FBC Scatter Memory layout Neil Armstrong
2020-07-02 7:47 ` [PATCH v8 6/6] drm/meson: crtc: handle commit of Amlogic FBC frames Neil Armstrong
2020-07-02 18:57 ` Kevin Hilman [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=7himf5iw2l.fsf@baylibre.com \
--to=khilman@baylibre.com \
--cc=daniel@ffwll.ch \
--cc=dri-devel@lists.freedesktop.org \
--cc=jianxin.pan@amlogic.com \
--cc=linux-amlogic@lists.infradead.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=narmstrong@baylibre.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).