[Intel-gfx] [PATCH v2] drm/i915: Implement fbc_status "Compressing" info for all platforms

[Ville Syrjälä]

On Tue, Jun 06, 2017 at 03:43:18PM +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> The number of compressed segments has been available ever since
> FBC2 was introduced in g4x, it just moved from the STATUS register
> into STATUS2 on IVB.
> 
> For FBC1 if we really wanted the number of compressed segments we'd
> have to trawl through the tags, but in this case since the code just
> uses the number of compressed segments as an indicator whether
> compression has occurred we can just check the state of the
> COMPRESSING and COMPRESSED bits. IIRC the hardware will try to
> periodically recompress all uncompressed lines even if they haven't
> changed and the COMPRESSED bit will be cleared while the compressor
> is running, so just checking the COMPRESSED bit might not give us
> the right answer. Hence it seems better to check for both
> COMPRESSED and COMPRESSING as that should tell us that the
> compressor is at least trying to do something.
> 
> While at it move the IVB+ register define to the right place, unify
> the naming convention of the compressed segment count masks, and
> fix up the mask for g4x.
> 
> v2: s/ILK_DPFC_STATUS2/IVB_FBC_STATUS2/ (Paulo)
> 
> Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> Cc: Gabriel Krisman Bertazi <krisman at collabora.co.uk>
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> Tested-by: Gabriel Krisman Bertazi <krisman at collabora.co.uk> # SNB
> Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com> # ilk+
> Acked-by: Paulo Zanoni <paulo.r.zanoni at intel.com> # pre-ilk

Pushed to dinq. Thanks for the review and testing.

-- 
Ville Syrjälä
Intel OTC