Merged PR 714: Change I2C frequency

Change I2C frequency Cherry-picked from commit `e656726a`. Related work items: torvalds#463
foxconn-bmc-ks · Aug 5, 2017 · 377dd57 · 377dd57
2 parents e025ee3 + 9ee1b77
commit 377dd57
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/arch/arm/mach-aspeed/aspeed.c b/arch/arm/mach-aspeed/aspeed.c
@@ -210,6 +210,12 @@ static void __init do_sthelens_setup(void)
         writel(0x00008000, AST_IO(AST_BASE_GPIO | 0x3C));
         writel(0x000000FF, AST_IO(AST_BASE_GPIO | 0xAC));
         writel(0x00000018, AST_IO(AST_BASE_GPIO | 0xFC));
+
+        /* fix low time and frequency issues of I2C signals */
+        writel(0x77777305, AST_IO(AST_BASE_I2C | 0x44));
+        writel(0x77777305, AST_IO(AST_BASE_I2C | 0x84));
+        writel(0x77777305, AST_IO(AST_BASE_I2C | 0xc4));
+        writel(0x77777305, AST_IO(0x1E78A100 | 0x04));
 }
 static void __init do_palmetto_setup(void)
 {