Valleyview & Cherryview To Get Atomic Mode-Setting Enabled

Intel's set to enable atomic mode-setting by default with code slated to land for the Linux 4.12 kernel.

The initial patches for enabling atomic mode-setting by default turned it on for Gen5 (Ironlake) hardware and newer, but left out Valleyview and Cherryview hardware due to problems. But now it looks like for Linux 4.12 the Cherryview/Valleyview problems could be addressed and see those mobile platforms go atomic too.

These patches published Friday by Ville Syrjälä fix the VLV/CHV hardware's watermark issue and goes ahead to enable the atomic support by default. See the aforelinked article for more details on the atomic mode-setting impact. To test Intel's atomic support right now on a Linux 4.9+ kernel, boot the kernel with i915.nuclear_pageflip=1 to enjoy it until the default change-over is made, most likely for Linux 4.12 unless something goes awry.