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dff457d74e
Currently we're doing:
1. acquire lock
2. write word to hardware
3. release lock
4. repeat from 1
to load the DMC firmware. Due to the cost of acquiring/releasing a lock,
and the size of the DMC firmware, this slows down DMC loading a lot.
This patch simply acquires the lock, writes the entire firmware,
then releases the lock. Testing shows resume speedups
in the order of 10ms on platforms with DMC firmware (GEN9+).
v2: Per feedback from Chris & Ville there's no need to do the whole
forcewake dance, so lose that bit (Chris, Ville)
v3: Actually send the new version of the patch...
v4: Don't acquire the uncore lock. Disable preempt. (Chris)
Signed-off-by: David Weinehall <david.weinehall@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20170905131050.11655-1-david.weinehall@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
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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.