Commit 7b231bb5 authored by Lars Poeschel's avatar Lars Poeschel Committed by Miguel Ojeda
Browse files

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: default avatarLars Poeschel <poeschel@lemonage.de>
Signed-off-by: default avatarMiguel Ojeda <ojeda@kernel.org>
parent a2060f28

drivers/auxdisplay/hd44780_common.c

+2 −2
Original line number Original line Diff line number Diff line
@@ -83,8 +83,8 @@ int hd44780_common_clear_display(struct charlcd *lcd) 
	struct hd44780_common *hdc = lcd->drvdata;

	struct hd44780_common *hdc = lcd->drvdata;





	hdc->write_cmd(hdc, LCD_CMD_DISPLAY_CLEAR);

	hdc->write_cmd(hdc, LCD_CMD_DISPLAY_CLEAR);

	/* we must wait a few milliseconds (15) */

	/* datasheet says to wait 1,64 milliseconds */

	long_sleep(15);

	long_sleep(2);

	return 0;

	return 0;

}

}

EXPORT_SYMBOL_GPL(hd44780_common_clear_display);

EXPORT_SYMBOL_GPL(hd44780_common_clear_display);