video: ipu: fix out of bounds access

We need to access reg stp_rep9, but not stp_rep[(9 - 1) / 2].
If using "__raw_writel(0, DI_STP_REP(disp, 9))", this will exceeds
the size of stp_rep array.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Acked-by: Liu Ying <Ying.Liu@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Anatolij Gustschin <agust@denx.de>

drivers/video/ipu_disp.c

@@ -1119,7 +1119,7 @@ int32_t ipu_init_sync_panel(int disp, uint32_t pixel_clk,
 		reg &= 0x0000FFFF;
 		__raw_writel(reg, DI_STP_REP(disp, 6));
 		__raw_writel(0, DI_STP_REP(disp, 7));
-		__raw_writel(0, DI_STP_REP(disp, 9));
+		__raw_writel(0, DI_STP_REP9(disp));
 
 		/* Init template microcode */
 		if (disp) {

drivers/video/ipu_regs.h

@@ -338,6 +338,7 @@ struct ipu_dmfc {
 #define DI_SW_GEN0(di, gen)	(&DI_REG(di)->sw_gen0[gen - 1])
 #define DI_SW_GEN1(di, gen)	(&DI_REG(di)->sw_gen1[gen - 1])
 #define DI_STP_REP(di, gen)	(&DI_REG(di)->stp_rep[(gen - 1) / 2])
+#define DI_STP_REP9(di)		(&DI_REG(di)->stp_rep9)
 #define DI_SYNC_AS_GEN(di)	(&DI_REG(di)->sync_as)
 #define DI_DW_GEN(di, gen)	(&DI_REG(di)->dw_gen[gen])
 #define DI_DW_SET(di, gen, set)	(&DI_REG(di)->dw_set[gen + 12 * set])