drivers/video/backlight/l4f00242t03.c: fix reset sequence

The reset command is part of the init sequence and it take effect
only if the lcd is powered.

The effect of the bug was that the sequence:
set lcd power_state to FB_BLANK_POWERDOWN
set lcd power_state to FB_BLANK_UNBLANK
Did not produced a complete reboot of the LCD which was showing fuzzy
colours.

This was not experienced before implementing correctly all the LCD power
states with the patch [1].  Since before the patch [1] the regulators were
not touched and the LCD shutdown was reached with a register write.  After
the patch [1] a complete boot sequence with an initial reset is needed for
the display every time the LCD is powered up.

drivers-video-backlight-l4f00242t03c-full-implement-fb-power-states-for-this-lcd.patch

Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Marek Vasut <marek.vasut@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/video/backlight/l4f00242t03.c b/drivers/video/backlight/l4f00242t03.c
index 1fcaaf3..98ad3e5 100644 (file)
--- a/drivers/video/backlight/l4f00242t03.c
+++ b/drivers/video/backlight/l4f00242t03.c
@@ -62,6 +62,8 @@ static void l4f00242t03_lcd_init(struct spi_device *spi)
                regulator_enable(priv->core_reg);
        }
 
+       l4f00242t03_reset(pdata->reset_gpio);
+
        gpio_set_value(pdata->data_enable_gpio, 1);
        msleep(60);
        spi_write(spi, (const u8 *)cmd, ARRAY_SIZE(cmd) * sizeof(u16));
@@ -227,7 +229,6 @@ static int __devinit l4f00242t03_probe(struct spi_device *spi)
        }
 
        /* Init the LCD */
-       l4f00242t03_reset(pdata->reset_gpio);
        l4f00242t03_lcd_init(spi);
        priv->lcd_state = FB_BLANK_VSYNC_SUSPEND;
        l4f00242t03_lcd_power_set(priv->ld, FB_BLANK_UNBLANK);