The patch titled
drivers/leds/leds-lp5521.c: adjust delays and add comments to them
has been removed from the -mm tree. Its filename was
drivers-leds-leds-lp5521c-adjust-delays-and-add-comments-to-them.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: drivers/leds/leds-lp5521.c: adjust delays and add comments to them
From: Samu Onkalo <samu.p.onkalo@xxxxxxxxx>
Delays were little bit too long. Adjust delay times and add some comments
to them.
Signed-off-by: Samu Onkalo <samu.p.onkalo@xxxxxxxxx>
Cc: Richard Purdie <rpurdie@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/leds/leds-lp5521.c | 25 ++++++++++++++++---------
1 file changed, 16 insertions(+), 9 deletions(-)
diff -puN drivers/leds/leds-lp5521.c~drivers-leds-leds-lp5521c-adjust-delays-and-add-comments-to-them drivers/leds/leds-lp5521.c
--- a/drivers/leds/leds-lp5521.c~drivers-leds-leds-lp5521c-adjust-delays-and-add-comments-to-them
+++ a/drivers/leds/leds-lp5521.c
@@ -196,14 +196,17 @@ static int lp5521_load_program(struct lp
/* move current engine to direct mode and remember the state */
ret = lp5521_set_engine_mode(eng, LP5521_CMD_DIRECT);
- usleep_range(1000, 10000);
+ /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
+ usleep_range(1000, 2000);
ret |= lp5521_read(client, LP5521_REG_OP_MODE, &mode);
/* For loading, all the engines to load mode */
lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
- usleep_range(1000, 10000);
+ /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
+ usleep_range(1000, 2000);
lp5521_write(client, LP5521_REG_OP_MODE, LP5521_CMD_LOAD);
- usleep_range(1000, 10000);
+ /* Mode change requires min 500 us delay. 1 - 2 ms with margin */
+ usleep_range(1000, 2000);
addr = LP5521_PROG_MEM_BASE + eng->prog_page * LP5521_PROG_MEM_SIZE;
i2c_smbus_write_i2c_block_data(client,
@@ -244,7 +247,10 @@ static int lp5521_configure(struct i2c_c
lp5521_write(client, LP5521_REG_RESET, 0xff);
- usleep_range(10000, 20000);
+ usleep_range(10000, 20000); /*
+ * Exact value is not available. 10 - 20ms
+ * appears to be enough for reset.
+ */
/* Set all PWMs to direct control mode */
ret = lp5521_write(client, LP5521_REG_OP_MODE, 0x3F);
@@ -262,8 +268,8 @@ static int lp5521_configure(struct i2c_c
ret |= lp5521_write(client, LP5521_REG_ENABLE,
LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM |
LP5521_EXEC_RUN);
- /* enable takes 500us */
- usleep_range(500, 20000);
+ /* enable takes 500us. 1 - 2 ms leaves some margin */
+ usleep_range(1000, 2000);
return ret;
}
@@ -316,7 +322,8 @@ static int lp5521_detect(struct i2c_clie
LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM);
if (ret)
return ret;
- usleep_range(1000, 10000);
+ /* enable takes 500us. 1 - 2 ms leaves some margin */
+ usleep_range(1000, 2000);
ret = lp5521_read(client, LP5521_REG_ENABLE, &buf);
if (ret)
return ret;
@@ -704,9 +711,9 @@ static int lp5521_probe(struct i2c_clien
if (pdata->enable) {
pdata->enable(0);
- usleep_range(1000, 10000);
+ usleep_range(1000, 2000); /* Keep enable down at least 1ms */
pdata->enable(1);
- usleep_range(1000, 10000); /* Spec says min 500us */
+ usleep_range(1000, 2000); /* 500us abs min. */
}
ret = lp5521_detect(client);
_
Patches currently in -mm which might be from samu.p.onkalo@xxxxxxxxx are
origin.patch
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