On Wed, 15 Oct 2014 12:12:11 +0200 Hans de Goede hdegoede@redhat.com wrote:
This change breaks various hardcoded assumptions in the linux-sunxi-3.4 kernels, causing a divide by 0 error in the linux-sunxi-3.4 nand driver, rendering 3.4 kernels unbootable. Besides this problem, it also breaks LCD output (on devices without nand).
Fixes for these issues are being added to the linux-sunxi-3.4 kernel, but for now it seems better to revert this.
This reverts commit 013f2d746955147439215a4939655c9ed6bdd866.
As mentioned in the commit message https://www.mail-archive.com/linux-sunxi@googlegroups.com/msg07884.html the hardcoded assumptions in the sunxi-3.4 kernel are still bad with or without this revert if somebody tries to use higher DRAM clock speeds.
The patch in question just smokes out bugs, which are otherwise still there.
Going forward, the mainline kernel needs the G2D driver and it needs to run at a decent clock speed to be provide reasonable performance. Low PLL5P clock speed is limiting our options.
This revert does not do anyone any favour and only postpones the resolution of the problem.