android/android_kernel_xiaomi_sm8450
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tridentfb: preserve memory type settings

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Do not overwrite bits which contain memory type settings.  It removes
noise pixels ("snow") on Blade3D and 3DImage chips.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Krzysztof Helt 2008-07-23 21:31:00 -07:00 committed by Linus Torvalds
parent 74a933feaf
commit 65e93e038c
1 changed files with 4 additions and 1 deletions
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5
drivers/video/tridentfb.c
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@ -1095,7 +1095,10 @@ static int tridentfb_set_par(struct fb_info *info)
vga_mm_wseq(par->io_virt, 4, 0x0E); /* memory mode enable bitmaps ?? */
/* divide clock by 2 if 32bpp chain4 mode display and CPU path */
write3CE(par, MiscExtFunc, (bpp == 32) ? 0x1A : 0x12);
tmp = read3CE(par, MiscExtFunc) & 0xF0;
if (bpp == 32)
tmp |= 8;
write3CE(par, MiscExtFunc, tmp | 0x12);
write3CE(par, 0x5, 0x40); /* no CGA compat, allow 256 col */
write3CE(par, 0x6, 0x05); /* graphics mode */
write3CE(par, 0x7, 0x0F); /* planes? */