diff options
| author | Lars Poeschel <poeschel@lemonage.de> | 2020-11-03 12:58:23 +0300 |
|---|---|---|
| committer | Miguel Ojeda <ojeda@kernel.org> | 2020-11-04 13:04:04 +0300 |
| commit | 377cf2cbfdb962579eedf2c29845c463c6973f7e (patch) | |
| tree | 250fd65498641eeeae51213e1ededf19e07fc45c /drivers/auxdisplay/panel.c | |
| parent | 7b231bb5d0bee86afc40db9ddfd50ba39ef73769 (diff) | |
| download | linux-377cf2cbfdb962579eedf2c29845c463c6973f7e.tar.xz | |
auxdisplay: hd44780: Remove clear_fast
We remove the hd44780_clear_fast (display) clear implementation. With
the new timeout the normal clear_display is reasonably fast. So there is
no need for a clear_fast anymore.
Link: https://lore.kernel.org/lkml/20200922092121.GG16421@1wt.eu/
Signed-off-by: Lars Poeschel <poeschel@lemonage.de>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Diffstat (limited to 'drivers/auxdisplay/panel.c')
| -rw-r--r-- | drivers/auxdisplay/panel.c | 67 |
1 files changed, 0 insertions, 67 deletions
diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c index b0d2ae5b9be8..e07fadac281d 100644 --- a/drivers/auxdisplay/panel.c +++ b/drivers/auxdisplay/panel.c @@ -808,72 +808,7 @@ static void lcd_write_data_tilcd(struct hd44780_common *hdc, int data) spin_unlock_irq(&pprt_lock); } -/* fills the display with spaces and resets X/Y */ -static void lcd_clear_fast_s(struct charlcd *charlcd) -{ - struct hd44780_common *hdc = charlcd->drvdata; - int pos; - - spin_lock_irq(&pprt_lock); - for (pos = 0; pos < charlcd->height * hdc->hwidth; pos++) { - lcd_send_serial(0x5F); /* R/W=W, RS=1 */ - lcd_send_serial(' ' & 0x0F); - lcd_send_serial((' ' >> 4) & 0x0F); - /* the shortest data takes at least 40 us */ - udelay(40); - } - spin_unlock_irq(&pprt_lock); -} - -/* fills the display with spaces and resets X/Y */ -static void lcd_clear_fast_p8(struct charlcd *charlcd) -{ - struct hd44780_common *hdc = charlcd->drvdata; - int pos; - - spin_lock_irq(&pprt_lock); - for (pos = 0; pos < charlcd->height * hdc->hwidth; pos++) { - /* present the data to the data port */ - w_dtr(pprt, ' '); - - /* maintain the data during 20 us before the strobe */ - udelay(20); - - set_bit(LCD_BIT_E, bits); - set_bit(LCD_BIT_RS, bits); - clear_bit(LCD_BIT_RW, bits); - set_ctrl_bits(); - - /* maintain the strobe during 40 us */ - udelay(40); - - clear_bit(LCD_BIT_E, bits); - set_ctrl_bits(); - - /* the shortest data takes at least 45 us */ - udelay(45); - } - spin_unlock_irq(&pprt_lock); -} - -/* fills the display with spaces and resets X/Y */ -static void lcd_clear_fast_tilcd(struct charlcd *charlcd) -{ - struct hd44780_common *hdc = charlcd->drvdata; - int pos; - - spin_lock_irq(&pprt_lock); - for (pos = 0; pos < charlcd->height * hdc->hwidth; pos++) { - /* present the data to the data port */ - w_dtr(pprt, ' '); - udelay(60); - } - - spin_unlock_irq(&pprt_lock); -} - static const struct charlcd_ops charlcd_serial_ops = { - .clear_fast = lcd_clear_fast_s, .backlight = lcd_backlight, .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, @@ -890,7 +825,6 @@ static const struct charlcd_ops charlcd_serial_ops = { }; static const struct charlcd_ops charlcd_parallel_ops = { - .clear_fast = lcd_clear_fast_p8, .backlight = lcd_backlight, .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, @@ -907,7 +841,6 @@ static const struct charlcd_ops charlcd_parallel_ops = { }; static const struct charlcd_ops charlcd_tilcd_ops = { - .clear_fast = lcd_clear_fast_tilcd, .backlight = lcd_backlight, .gotoxy = hd44780_common_gotoxy, .home = hd44780_common_home, |