[media] smiapp-pll: Constify limits argument to smiapp_pll_calculate()

The limits are input parameters and should not be modified by the
smiapp_pll_calculate() function. Make them const.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/i2c/smiapp-pll.c

@@ -88,7 +88,7 @@ static void print_pll(struct device *dev, struct smiapp_pll *pll)
 }
 
 static int __smiapp_pll_calculate(struct device *dev,
-				  struct smiapp_pll_limits *limits,
+				  const struct smiapp_pll_limits *limits,
 				  struct smiapp_pll *pll, uint32_t mul,
 				  uint32_t div, uint32_t lane_op_clock_ratio)
 {
@@ -306,14 +306,10 @@ static int __smiapp_pll_calculate(struct device *dev,
 	pll->pixel_rate_csi =
 		pll->op_pix_clk_freq_hz * lane_op_clock_ratio;
 
-	rval = bounds_check(dev, pll->pre_pll_clk_div,
-			    limits->min_pre_pll_clk_div,
-			    limits->max_pre_pll_clk_div, "pre_pll_clk_div");
-	if (!rval)
-		rval = bounds_check(
-			dev, pll->pll_ip_clk_freq_hz,
-			limits->min_pll_ip_freq_hz, limits->max_pll_ip_freq_hz,
-			"pll_ip_clk_freq_hz");
+	rval = bounds_check(dev, pll->pll_ip_clk_freq_hz,
+			    limits->min_pll_ip_freq_hz,
+			    limits->max_pll_ip_freq_hz,
+			    "pll_ip_clk_freq_hz");
 	if (!rval)
 		rval = bounds_check(
 			dev, pll->pll_multiplier,
@@ -362,9 +358,12 @@ static int __smiapp_pll_calculate(struct device *dev,
 	return rval;
 }
 
-int smiapp_pll_calculate(struct device *dev, struct smiapp_pll_limits *limits,
+int smiapp_pll_calculate(struct device *dev,
+			 const struct smiapp_pll_limits *limits,
 			 struct smiapp_pll *pll)
 {
+	uint16_t min_pre_pll_clk_div;
+	uint16_t max_pre_pll_clk_div;
 	uint32_t lane_op_clock_ratio;
 	uint32_t mul, div;
 	unsigned int i;
@@ -397,33 +396,33 @@ int smiapp_pll_calculate(struct device *dev, struct smiapp_pll_limits *limits,
 	/* Figure out limits for pre-pll divider based on extclk */
 	dev_dbg(dev, "min / max pre_pll_clk_div: %d / %d\n",
 		limits->min_pre_pll_clk_div, limits->max_pre_pll_clk_div);
-	limits->max_pre_pll_clk_div =
+	max_pre_pll_clk_div =
 		min_t(uint16_t, limits->max_pre_pll_clk_div,
 		      clk_div_even(pll->ext_clk_freq_hz /
 				   limits->min_pll_ip_freq_hz));
-	limits->min_pre_pll_clk_div =
+	min_pre_pll_clk_div =
 		max_t(uint16_t, limits->min_pre_pll_clk_div,
 		      clk_div_even_up(
 			      DIV_ROUND_UP(pll->ext_clk_freq_hz,
 					   limits->max_pll_ip_freq_hz)));
 	dev_dbg(dev, "pre-pll check: min / max pre_pll_clk_div: %d / %d\n",
-		limits->min_pre_pll_clk_div, limits->max_pre_pll_clk_div);
+		min_pre_pll_clk_div, max_pre_pll_clk_div);
 
 	i = gcd(pll->pll_op_clk_freq_hz, pll->ext_clk_freq_hz);
 	mul = div_u64(pll->pll_op_clk_freq_hz, i);
 	div = pll->ext_clk_freq_hz / i;
 	dev_dbg(dev, "mul %d / div %d\n", mul, div);
 
-	limits->min_pre_pll_clk_div =
-		max_t(uint16_t, limits->min_pre_pll_clk_div,
+	min_pre_pll_clk_div =
+		max_t(uint16_t, min_pre_pll_clk_div,
 		      clk_div_even_up(
 			      DIV_ROUND_UP(mul * pll->ext_clk_freq_hz,
 					   limits->max_pll_op_freq_hz)));
 	dev_dbg(dev, "pll_op check: min / max pre_pll_clk_div: %d / %d\n",
-		limits->min_pre_pll_clk_div, limits->max_pre_pll_clk_div);
+		min_pre_pll_clk_div, max_pre_pll_clk_div);
 
-	for (pll->pre_pll_clk_div = limits->min_pre_pll_clk_div;
-	     pll->pre_pll_clk_div <= limits->max_pre_pll_clk_div;
+	for (pll->pre_pll_clk_div = min_pre_pll_clk_div;
+	     pll->pre_pll_clk_div <= max_pre_pll_clk_div;
 	     pll->pre_pll_clk_div += 2 - (pll->pre_pll_clk_div & 1)) {
 		rval = __smiapp_pll_calculate(dev, limits, pll, mul, div,
 					      lane_op_clock_ratio);

drivers/media/i2c/smiapp-pll.h

@@ -107,7 +107,8 @@ struct smiapp_pll_limits {
 
 struct device;
 
-int smiapp_pll_calculate(struct device *dev, struct smiapp_pll_limits *limits,
+int smiapp_pll_calculate(struct device *dev,
+			 const struct smiapp_pll_limits *limits,
 			 struct smiapp_pll *pll);
 
 #endif /* SMIAPP_PLL_H */