[Intel-gfx] [PATCH] drm/i915/fbdev: Restore physical addresses for fb_mmap()

[Chris Wilson]

Quoting Chris Wilson (2019-11-13 18:06:33)
> fbdev uses the physical address of our framebuffer for its fb_mmap()
> routine. While we need to adapt this address for the new io BAR, we have
> to fix v5.4 first! The simplest fix is to restore the smem back to v5.4
> and we will then probably have to implement our fbops->fb_mmap() call
> back to handle local memory.
> 
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=112256
> Fixes: 5f889b9a61dd ("drm/i915: Disregard drm_mode_config.fb_base")
Testcase: igt/fbdev/mmap
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
-Chris