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| author |   Lars Poeschel <poeschel@lemonage.de> | 2020-11-03 10:58:22 +0100 |
|---|---|---|
| committer |   Miguel Ojeda <ojeda@kernel.org> | 2020-11-04 11:04:04 +0100 |
| commit | 7b231bb5d0bee86afc40db9ddfd50ba39ef73769 (patch) | |
| tree | 1d8305a36d376eee48d8206a3e424ca826883334 /drivers/auxdisplay | |
| parent | auxdisplay: Call charlcd_backlight in place (diff) | |
| download | linux-dev-7b231bb5d0bee86afc40db9ddfd50ba39ef73769.tar.xz linux-dev-7b231bb5d0bee86afc40db9ddfd50ba39ef73769.zip | |
auxdisplay: hd44780_common: Reduce clear_display timeout
Digging in the hd44780 datasheet revealed that the timeout needed after
clearing the whole display is only 1,64ms not 15ms. So we can reduce
that timeout.
Link: https://lore.kernel.org/lkml/20200922092121.GG16421@1wt.eu/
Link: https://www.crystalfontz.com/controllers/Hitachi/HD44780/433/
Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'drivers/auxdisplay')
| -rw-r--r-- | drivers/auxdisplay/hd44780_common.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/auxdisplay/hd44780_common.c b/drivers/auxdisplay/hd44780_common.c index c528fb8e8808..bd93a4d3367e 100644 --- a/drivers/auxdisplay/hd44780_common.c +++ b/drivers/auxdisplay/hd44780_common.c @@ -83,8 +83,8 @@ int hd44780_common_clear_display(struct charlcd *lcd) struct hd44780_common *hdc = lcd->drvdata; hdc->write_cmd(hdc, LCD_CMD_DISPLAY_CLEAR); - /* we must wait a few milliseconds (15) */ - long_sleep(15); + /* datasheet says to wait 1,64 milliseconds */ + long_sleep(2); return 0; } EXPORT_SYMBOL_GPL(hd44780_common_clear_display); |