[PATCH v5] media: staging/intel-ipu3: css: simplify expression

[PATCH v5] media: staging/intel-ipu3: css: simplify expression

[Deepak R Varma]

An array index computed inside square brackets complicates the code
and also extends the line beyond 80 character. Add new variable to
compute array index separately and use it as an index during assignment.

Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
---

Changes since v4:
	1. phase_taps variable implementation is now consistent in both
	the code blocks as suggested by Stefano.
	2. Also including linux-media list as a receipient of the media
	patch as advised by Sakari Ailus.
	
Changes since v3:
        1. Removed extra 'i' alongside word PATCH in the subject line
        2. Removed extra curly braces that are no more needed post
        implemented changes. Pointed out by Stefano.
Changes since v2:
  - Added feedback from Julia
        1. Rephrase patch description to make it concise and simpler.
Changes since v1:
  - Added feedback from Helen
        1. Updated variable type to "unsigned int" from earlier "int"
        2. Implemented the change in another area in same scope
        3. Left newly added variable uninitialised.


 drivers/staging/media/ipu3/ipu3-css-params.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/staging/media/ipu3/ipu3-css-params.c b/drivers/staging/media/ipu3/ipu3-css-params.c
index 4533dacad4be..fbd53d7c097c 100644
--- a/drivers/staging/media/ipu3/ipu3-css-params.c
+++ b/drivers/staging/media/ipu3/ipu3-css-params.c
@@ -49,14 +49,13 @@ imgu_css_scaler_setup_lut(unsigned int taps, unsigned int input_width,
 	int tap, phase, phase_sum_left, phase_sum_right;
 	int exponent = imgu_css_scaler_get_exp(output_width, input_width);
 	int mantissa = (1 << exponent) * output_width;
-	unsigned int phase_step;
+	unsigned int phase_step, phase_taps;
 
 	if (input_width == output_width) {
 		for (phase = 0; phase < IMGU_SCALER_PHASES; phase++) {
-			for (tap = 0; tap < taps; tap++) {
-				coeff_lut[phase * IMGU_SCALER_FILTER_TAPS + tap]
-					= 0;
-			}
+			phase_taps = phase * IMGU_SCALER_FILTER_TAPS;
+			for (tap = 0; tap < taps; tap++)
+				coeff_lut[phase_taps + tap] = 0;
 		}
 
 		info->phase_step = IMGU_SCALER_PHASES *
@@ -71,6 +70,7 @@ imgu_css_scaler_setup_lut(unsigned int taps, unsigned int input_width,
 	}
 
 	for (phase = 0; phase < IMGU_SCALER_PHASES; phase++) {
+		phase_taps = phase * IMGU_SCALER_FILTER_TAPS;
 		for (tap = 0; tap < taps; tap++) {
 			/* flip table to for convolution reverse indexing */
 			s64 coeff = coeffs[coeffs_size -
@@ -81,9 +81,7 @@ imgu_css_scaler_setup_lut(unsigned int taps, unsigned int input_width,
 			/* Add +"0.5" */
 			coeff += 1 << (IMGU_SCALER_COEFF_BITS - 1);
 			coeff >>= IMGU_SCALER_COEFF_BITS;
-
-			coeff_lut[phase * IMGU_SCALER_FILTER_TAPS + tap] =
-				coeff;
+			coeff_lut[phase_taps + tap] = coeff;
 		}
 	}
 
-- 
2.17.1