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auxdisplay update for v6.6

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- hd44780: move cursor home after clear display command
 
    The change allows to support displays like the NewHaven
    NHD-0220DZW-AG5 which has a non-standard controller.
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Merge tag 'auxdisplay-6.6' of https://github.com/ojeda/linux

Pull auxdisplay update from Miguel Ojeda:

 - hd44780: move cursor home after clear display command

   The change allows to support displays like the NewHaven
   NHD-0220DZW-AG5 which has a non-standard controller.

* tag 'auxdisplay-6.6' of https://github.com/ojeda/linux:
  auxdisplay: hd44780: move cursor home after clear display command
This commit is contained in:
Linus Torvalds 2023-08-29 08:32:28 -07:00
commit 5ea0cf7758
1 changed files with 9 additions and 1 deletions
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10
drivers/auxdisplay/hd44780_common.c
View File

@ -82,7 +82,15 @@ int hd44780_common_clear_display(struct charlcd *lcd)
hdc->write_cmd(hdc, LCD_CMD_DISPLAY_CLEAR);
/* datasheet says to wait 1,64 milliseconds */
long_sleep(2);
return 0;
/*
* The Hitachi HD44780 controller (and compatible ones) reset the DDRAM
* address when executing the DISPLAY_CLEAR command, thus the
* following call is not required. However, other controllers do not
* (e.g. NewHaven NHD-0220DZW-AG5), thus move the cursor to home
* unconditionally to support both.
*/
return hd44780_common_home(lcd);
}
EXPORT_SYMBOL_GPL(hd44780_common_clear_display);