memory: brcmstb: dpfe: introduce is_dcpu_enabled()

In order to check whether or not the DCPU is running, we introduce
a function called is_dcpu_enabled().
Signed-off-by: Markus Mayer <mmayer@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

drivers/memory/brcmstb_dpfe.c

@@ -202,17 +202,26 @@ static const u32 dpfe_commands[DPFE_CMD_MAX][MSG_FIELD_MAX] = {
 	},
 };
 
+static bool is_dcpu_enabled(void __iomem *regs)
+{
+	u32 val;
+
+	val = readl_relaxed(regs + REG_DCPU_RESET);
+
+	return !(val & DCPU_RESET_MASK);
+}
+
 static void __disable_dcpu(void __iomem *regs)
 {
 	u32 val;
 
-	/* Check if DCPU is running */
+	if (!is_dcpu_enabled(regs))
+		return;
+
+	/* Put DCPU in reset if it's running. */
 	val = readl_relaxed(regs + REG_DCPU_RESET);
-	if (!(val & DCPU_RESET_MASK)) {
-		/* Put DCPU in reset */
 	val |= (1 << DCPU_RESET_SHIFT);
 	writel_relaxed(val, regs + REG_DCPU_RESET);
-	}
 }
 
 static void __enable_dcpu(void __iomem *regs)