linux-kernel - Re: [PATCH v2 0/4] Add support for Arm Framebuffer Compression(AFBC)

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Message-ID: <20180910122649.GO5565@intel.com>
Date:   Mon, 10 Sep 2018 15:26:49 +0300
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Neil Armstrong <narmstrong@...libre.com>,
        Ayan Kumar Halder <ayan.halder@....com>, liviu.dudau@....com,
        brian.starkey@....com, malidp@...s.arm.com, airlied@...ux.ie,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        nd@....com
Subject: Re: [PATCH v2 0/4] Add support for Arm Framebuffer Compression(AFBC)

On Sun, Sep 09, 2018 at 02:03:57PM +0200, Daniel Vetter wrote:
> On Sat, Sep 08, 2018 at 03:58:53PM +0200, Neil Armstrong wrote:
> > Hi Ayan,
> > 
> > On 10/07/2018 15:18, Ayan Kumar Halder wrote:
> > > In the current series of patches, we are trying to add support for AFBC
> > > modifiers in malidp. AFBC modifiers adds some constraints to framebuffer
> > > size, alignment, pitch, formats, etc. Here we are trying to add support
> > > for one combination of AFBC modifier ie AFBC_FORMAT_MOD_BLOCK_SIZE_16x16 |
> > > AFBC_FORMAT_MOD_SPARSE | AFBC_FORMAT_MOD_YTR.
> > > In future, we intend to add support for more combination of AFBC modifiers.
> > > Currently, we are trying to enable a basic support of AFBC in malidp.
> > 
> > Thanks for pushing AFBC support, this will help supporting it on other SoCs implementing support
> > like Amlogic, Rockchip or Samsung.
> > 
> > I have one question, is there a way to generate such AFBC buffers without the Mali GPU ?
> > I mean, is there a way to generate some sample buffers with some of the modifier features
> > to validate it without having the complete Mali GPU -> DRM chain ?
> 
> An igt would be perfect. We've done that for i915 compressed buffers. Note
> that it just needs to be an afbc buffer, not actually compressed. Setting
> all the bits to indicate "uncompressed" for each block is what we did for
> the i915 test.

Actually no. The i915 test does try to put some compressed data into the
buffer.

I have also a pending patch series [1] that allows us to render to
compressed buffers with cairo by compressing the results using the
GPU.

[1] https://patchwork.freedesktop.org/series/46876/

-- 
Ville Syrjälä
Intel