atyfb: halve XCLK with Mobility and 32bit memory
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>
diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
index b61ab3b..ea67dd9 100644
--- a/drivers/video/aty/atyfb_base.c
+++ b/drivers/video/aty/atyfb_base.c
@@ -2377,6 +2377,9 @@
/* 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
diff --git a/include/video/mach64.h b/include/video/mach64.h
index 09a7f4a..a8332e5 100644
--- a/include/video/mach64.h
+++ b/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
