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Author: Elizabeth Myers <elizabeth@adelielinux.org>
I'm certain this fix is wrong fwiw, but it's the best I could come with
--- linux-4.14/drivers/gpu/drm/ast/ast_fb.c.old 2017-11-12 12:46:13.000000000 -0600
+++ linux-4.14/drivers/gpu/drm/ast/ast_fb.c 2018-06-30 20:54:43.530000000 -0500
@@ -109,9 +109,30 @@
unmap = true;
}
for (i = y; i <= y2; i++) {
+ int copy_width = x2 - x + 1;
/* assume equal stride for now */
src_offset = dst_offset = i * afbdev->afb.base.pitches[0] + (x * bpp);
- memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, (x2 - x + 1) * bpp);
+ switch (bpp) {
+ case 4:
+ while (copy_width) {
+ iowrite32(*(u32 *)(afbdev->sysram + src_offset),
+ bo->kmap.virtual + src_offset);
+ src_offset += 4;
+ copy_width--;
+ }
+ break;
+ case 2:
+ while (copy_width) {
+ iowrite16(*(u16 *)(afbdev->sysram + src_offset),
+ bo->kmap.virtual + src_offset);
+ src_offset += 2;
+ copy_width--;
+ }
+ break;
+ default:
+ memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, (x2 - x + 1) * bpp);
+ break;
+ }
}
if (unmap)
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