3fd5d1ecae
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@intel.com> Cc: Gabriel Krisman Bertazi <krisman@collabora.co.uk> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Tested-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk> # SNB Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> # ilk+ Acked-by: Paulo Zanoni <paulo.r.zanoni@intel.com> # pre-ilk Link: http://patchwork.freedesktop.org/patch/msgid/20170606124318.31755-1-ville.syrjala@linux.intel.com
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.