i810fb: Fix incorrect frequency mask

Fix a long-standing bug. The mask used to detect a 100Mhz or 133Mhz chipset is incorrect. (The only side effect of this bug is that it will choose an incorrect watermark).

---

 drivers/video/i810/i810.h |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index aa65ffc..889e4ea 100644
@@ -133,7 +133,7 @@ #define FONTDATAMAX                 8192
 /* Masks (AND ops) and OR's */
 #define FB_START_MASK               (0x3f << (32 - 6))
 #define MMIO_ADDR_MASK              (0x1FFF << (32 - 13))
-#define FREQ_MASK                   0x1EF
+#define FREQ_MASK                   (1 << 4)
 #define SCR_OFF                     0x20
 #define DRAM_ON                     0x08            
 #define DRAM_OFF                    0xE7

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