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atyfb: halve XCLK with Mobility and 32bit memory

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Laptops with Rage Mobility and 32bit memory interface seem to require halved
XCLK to operate correctly.

Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ville Syrjala 2007-05-08 00:39:47 -07:00 committed by Linus Torvalds
parent b4e124c138
commit 159dde9369
2 changed files with 4 additions and 0 deletions
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3
drivers/video/aty/atyfb_base.c
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@ -2377,6 +2377,9 @@ static int __devinit aty_init(struct fb_info *info)
/* for many chips, the mclk is 67 MHz for SDRAM, 63 MHz otherwise */
if (par->pll_limits.mclk == 67 && par->ram_type < SDRAM)
par->pll_limits.mclk = 63;
/* Mobility + 32bit memory interface need halved XCLK. */
if (M64_HAS(MOBIL_BUS) && par->ram_type == SDRAM32)
par->pll_limits.xclk = (par->pll_limits.xclk + 1) >> 1;
}
#endif

1
include/video/mach64.h
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@ -885,6 +885,7 @@
#define SDRAM 4
#define SGRAM 5
#define WRAM 6
#define SDRAM32 6
#define DAC_INTERNAL 0x00
#define DAC_IBMRGB514 0x01