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    ps3fb: fix possible overlap of GPU command buffer and frame buffer · 2ce32e15
    Geert Uytterhoeven 提交于
    ps3fb: In the case of non-fullscreen video modes, there was a partial overlap
    of the GPU command buffer and the frame buffer. Fix and cleanup various issues
    with overlap and alignment:
      - Move the GPU command buffer from the beginning to the end of video memory
      - Exclude the GPU command buffer from the actual frame buffer memory
      - Align the start of the virtual frame buffer to PAGE_SIZE instead of to 64
        KiB, and don't waste memory if it's already aligned (for fullscreen modes)
      - Take into account the alignment when checking memory requirements and
        maximum number of frames
      - Make sure fb_fix_screeninfo.smem_start always points to the virtual frame
        buffer start, so we don't have to compensate for that in ps3fb_mmap()
    Signed-off-by: NGeert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
    Cc: "Antonino A. Daplas" <adaplas@pol.net>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    2ce32e15
ps3fb.c 30.1 KB