From aff5ce6ca8d25c7dbcd886e2e51dd081981af95e Mon Sep 17 00:00:00 2001 From: Alberto Panizzo Date: Wed, 12 Jan 2011 16:59:24 -0800 Subject: 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 Cc: Richard Purdie Cc: Marek Vasut Cc: Tejun Heo Cc: Axel Lin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/backlight/l4f00242t03.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/video/backlight/l4f00242t03.c b/drivers/video/backlight/l4f00242t03.c index 1fcaaf3d78e1..98ad3e5f7c85 100644 --- 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); -- cgit v1.2.3