  `The previous behavior was a little unexpected, its properties/problems:1. It was designed to generate strictly increasing values (no repeats)2. It had quantization errors when calculating step size. Resulting inunexpected jumps near the end of some segments.Example settings:	brightness-levels = <0 1 2 4 8 16 32 64 128 256>;	num-interpolated-steps = <16>;Whenever num-interpolated-steps was larger than the distancebetween 2 consecutive brightness levels the table would get reallydiscontinuous. The slope of the interpolation would stick withintegers only and if it was 0 the whole line segment would get skipped.The distances between 1 2 4 and 8 would be 1 (property #1 fighting us),and only starting with 16 it would start to interpolate properly.Property #1 is not enough. The goal here is more than just monotonicallyincreasing. We should still care about the shape of the curve. Repeatedpoints might be desired if we're in the part of the curve where we wantto go slow (aka slope near 0).Problem #2 is plainly a bug. Imagine if the 64 entry was 63 instead,the calculated slope on the 32-63 segment will be almost half as itshould be.The most expected and simplest algorithm for interpolation is linearinterpolation, which would handle both problems.Let's just implement that!Take pairs of points from the brightness-levels array and linearlyinterpolate between them. On the X axis (what userspace sees) we'llnow have equally sized intervals (num-interpolated-steps sized,as opposed to before where we were at the mercy of quantization).ENDSigned-off-by: Alexandru Stan <amstan@chromium.org>--- drivers/video/backlight/pwm_bl.c | 70 ++++++++++++++------------------ 1 file changed, 31 insertions(+), 39 deletions(-)diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.cindex dfc760830eb9..e48fded3e414 100644--- a/drivers/video/backlight/pwm_bl.c+++ b/drivers/video/backlight/pwm_bl.c@@ -230,8 +230,7 @@ static int pwm_backlight_parse_dt(struct device *dev, 				  struct platform_pwm_backlight_data *data) { 	struct device_node *node = dev->of_node;-	unsigned int num_levels = 0;-	unsigned int levels_count;+	unsigned int num_levels; 	unsigned int num_steps = 0; 	struct property *prop; 	unsigned int *table;@@ -260,12 +259,11 @@ static int pwm_backlight_parse_dt(struct device *dev, 	if (!prop) 		return 0; -	data->max_brightness = length / sizeof(u32);+	num_levels = length / sizeof(u32);  	/* read brightness levels from DT property */-	if (data->max_brightness > 0) {-		size_t size = sizeof(*data->levels) * data->max_brightness;-		unsigned int i, j, n = 0;+	if (num_levels > 0) {+		size_t size = sizeof(*data->levels) * num_levels;  		data->levels = devm_kzalloc(dev, size, GFP_KERNEL); 		if (!data->levels)@@ -273,7 +271,7 @@ static int pwm_backlight_parse_dt(struct device *dev,  		ret = of_property_read_u32_array(node, "brightness-levels", 						 data->levels,-						 data->max_brightness);+						 num_levels); 		if (ret < 0) 			return ret; @@ -298,7 +296,13 @@ static int pwm_backlight_parse_dt(struct device *dev, 		 * between two points. 		 */ 		if (num_steps) {-			if (data->max_brightness < 2) {+			unsigned int num_input_levels = num_levels;+			unsigned int i;+			u32 x1, x2, x, dx;+			u32 y1, y2;+			s64 dy;++			if (num_input_levels < 2) { 				dev_err(dev, "can't interpolate\n"); 				return -EINVAL; 			}@@ -308,14 +312,7 @@ static int pwm_backlight_parse_dt(struct device *dev, 			 * taking in consideration the number of interpolated 			 * steps between two levels. 			 */-			for (i = 0; i < data->max_brightness - 1; i++) {-				if ((data->levels[i + 1] - data->levels[i]) /-				   num_steps)-					num_levels += num_steps;-				else-					num_levels++;-			}-			num_levels++;+			num_levels = (num_input_levels - 1) * num_steps + 1; 			dev_dbg(dev, "new number of brightness levels: %d\n", 				num_levels); @@ -327,24 +324,25 @@ static int pwm_backlight_parse_dt(struct device *dev, 			table = devm_kzalloc(dev, size, GFP_KERNEL); 			if (!table) 				return -ENOMEM;--			/* Fill the interpolated table. */-			levels_count = 0;-			for (i = 0; i < data->max_brightness - 1; i++) {-				value = data->levels[i];-				n = (data->levels[i + 1] - value) / num_steps;-				if (n > 0) {-					for (j = 0; j < num_steps; j++) {-						table[levels_count] = value;-						value += n;-						levels_count++;-					}-				} else {-					table[levels_count] = data->levels[i];-					levels_count++;+			/*+			 * Fill the interpolated table[x] = y+			 * by draw lines between each (x1, y1) to (x2, y2).+			 */+			dx = num_steps;+			for (i = 0; i < num_input_levels - 1; i++) {+				x1 = i * dx;+				x2 = x1 + dx;+				y1 = data->levels[i];+				y2 = data->levels[i + 1];+				dy = (s64)y2 - y1;++				for (x = x1; x < x2; x++) {+					table[x] = y1 ++						div_s64(dy * (x - x1), dx); 				} 			}-			table[levels_count] = data->levels[i];+			/* Fill in the last point, since no line starts here. */+			table[x2] = y2;  			/* 			 * As we use interpolation lets remove current@@ -353,15 +351,9 @@ static int pwm_backlight_parse_dt(struct device *dev, 			 */ 			devm_kfree(dev, data->levels); 			data->levels = table;--			/*-			 * Reassign max_brightness value to the new total number-			 * of brightness levels.-			 */-			data->max_brightness = num_levels; 		} -		data->max_brightness--;+		data->max_brightness = num_levels - 1; 	}  	return 0;-- 2.28.0`   