15 Jan
2016
15 Jan
'16
4:28 p.m.
On Thu, Jan 14, 2016 at 05:14:47PM -0800, Stefan Agner wrote:
On a slightly other topic, I question whether REGCACHE_RBTREE is the right cache type for the DCU DRM driver. The driver has uses a regmap area of 1144 32-bit registers, the most space is used by the layer configuration registers which are 0x40 apart and 0x0-0x20 for each layer are actually used (hence somewhat above 50%).
Would FLAT be the better cache type?
Yes, and if it's a MMIO device the performance of a flat cache is more in line with the device performance.