[patch 3/3] atyfb: Halve XCLK with Mobility and 32bit memory
From: Ville Syrjala <syrjala@sci.fi>
Date: 2007-04-28 18:18:22
Laptops with Rage Mobility and 32bit memory interface seem to require halved XCLK to operate correctly. --- drivers/video/aty/atyfb_base.c | 3 +++ include/video/mach64.h | 1 + 2 files changed, 4 insertions(+) Index: linux-2.6.20.7/drivers/video/aty/atyfb_base.c ===================================================================
--- linux-2.6.20.7.orig/drivers/video/aty/atyfb_base.c
+++ linux-2.6.20.7/drivers/video/aty/atyfb_base.c@@ -2430,6 +2430,9 @@ static int __devinit aty_init(struct fb_ /* 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
Index: linux-2.6.20.7/include/video/mach64.h ===================================================================
--- linux-2.6.20.7.orig/include/video/mach64.h
+++ linux-2.6.20.7/include/video/mach64.h@@ -885,6 +885,7 @@ #define SDRAM 4 #define SGRAM 5 #define WRAM 6 +#define SDRAM32 6 #define DAC_INTERNAL 0x00 #define DAC_IBMRGB514 0x01
--
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