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Subject[PATCH 08/10] leds: lp5523: remove unnecessary writing commands
Date
This patch reduces the number of programming commands.

(Count of sending commands)
Old code: 32 + program size (32 counts for clearing program memory)
New code: 32

Pattern buffer is initialized to 0 in this function.
Just update new program data and remaining buffers are filled with 0.
So it's needless to clear whole area.

Signed-off-by: Milo Kim <milo.kim@ti.com>
---
drivers/leds/leds-lp5523.c | 14 +++-----------
1 file changed, 3 insertions(+), 11 deletions(-)

diff --git a/drivers/leds/leds-lp5523.c b/drivers/leds/leds-lp5523.c
index 9b8be6f6..fe3bcbb 100644
--- a/drivers/leds/leds-lp5523.c
+++ b/drivers/leds/leds-lp5523.c
@@ -312,17 +312,11 @@ static int lp5523_update_program_memory(struct lp55xx_chip *chip,
u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
unsigned cmd;
char c[3];
- int update_size;
int nrchars;
- int offset = 0;
int ret;
- int i;
-
- /* clear program memory before updating */
- for (i = 0; i < LP5523_PROGRAM_LENGTH; i++)
- lp55xx_write(chip, LP5523_REG_PROG_MEM + i, 0);
+ int offset = 0;
+ int i = 0;

- i = 0;
while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
/* separate sscanfs because length is working only for %s */
ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
@@ -342,11 +336,9 @@ static int lp5523_update_program_memory(struct lp55xx_chip *chip,
if (i % 2)
goto err;

- update_size = i;
-
mutex_lock(&chip->lock);

- for (i = 0; i < update_size; i++) {
+ for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) {
ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
if (ret) {
mutex_unlock(&chip->lock);
--
1.7.9.5


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