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auxdisplay: hd44780_common: Reduce clear_display timeout

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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>
This commit is contained in:
Lars Poeschel 2020-11-03 10:58:22 +01:00 • committed by Miguel Ojeda
parent a2060f288e
commit 7b231bb5d0
1 changed files with 2 additions and 2 deletions
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4
drivers/auxdisplay/hd44780_common.c
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@ -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);