diff options
Diffstat (limited to 'target/linux/s3c24xx/patches-2.6.24/1295-This-patch-adds-a-framebuffer-notifier-in-order-to-d.patch')
| -rw-r--r-- | target/linux/s3c24xx/patches-2.6.24/1295-This-patch-adds-a-framebuffer-notifier-in-order-to-d.patch | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/patches-2.6.24/1295-This-patch-adds-a-framebuffer-notifier-in-order-to-d.patch b/target/linux/s3c24xx/patches-2.6.24/1295-This-patch-adds-a-framebuffer-notifier-in-order-to-d.patch new file mode 100644 index 0000000000..f698c8258f --- /dev/null +++ b/target/linux/s3c24xx/patches-2.6.24/1295-This-patch-adds-a-framebuffer-notifier-in-order-to-d.patch @@ -0,0 +1,120 @@ +From 9aa87d67df2e59eea15f70c4e58f8bde10e5953b Mon Sep 17 00:00:00 2001 +From: Harald Welte <laforge@openmoko.org> +Date: Wed, 8 Oct 2008 11:13:46 +0100 +Subject: [PATCH] This patch adds a framebuffer notifier in order to detect + FB_BLANK events and switch the JBT6K74 LCM controller into + its power saving mode. + +This has the potential of saving something like 50mW during screen blank. + +Signed-off-by: Harald Welte <laforge@openmoko.org> +--- + drivers/video/display/jbt6k74.c | 48 +++++++++++++++++++++++++++++++++++++++ + 1 files changed, 48 insertions(+), 0 deletions(-) + +diff --git a/drivers/video/display/jbt6k74.c b/drivers/video/display/jbt6k74.c +index b406298..9570543 100644 +--- a/drivers/video/display/jbt6k74.c ++++ b/drivers/video/display/jbt6k74.c +@@ -3,6 +3,7 @@ + * Copyright (C) 2006-2007 by Openmoko, Inc. + * Author: Harald Welte <laforge@openmoko.org>, + * Stefan Schmidt <stefan@openmoko.org> ++ * Copyright (C) 2008 by Harald Welte <laforge@openmoko.org> + * All rights reserved. + * + * This program is free software; you can redistribute it and/or +@@ -21,6 +22,7 @@ + * MA 02111-1307 USA + * + */ ++ + #include <linux/kernel.h> + #include <linux/types.h> + #include <linux/module.h> +@@ -28,6 +30,7 @@ + #include <linux/platform_device.h> + #include <linux/delay.h> + #include <linux/jbt6k74.h> ++#include <linux/fb.h> + + enum jbt_register { + JBT_REG_SLEEP_IN = 0x10, +@@ -111,6 +114,7 @@ struct jbt_info { + enum jbt_state state, last_state; + struct spi_device *spi_dev; + struct mutex lock; /* protects tx_buf and reg_cache */ ++ struct notifier_block fb_notif; + u16 tx_buf[8]; + u16 reg_cache[0xEE]; + int have_resumed; +@@ -548,6 +552,40 @@ static struct attribute_group jbt_attr_group = { + .attrs = jbt_sysfs_entries, + }; + ++static int fb_notifier_callback(struct notifier_block *self, ++ unsigned long event, void *data) ++{ ++ struct jbt_info *jbt; ++ struct fb_event *evdata = data; ++ int fb_blank; ++ ++ if (event != FB_EVENT_BLANK && event != FB_EVENT_CONBLANK) ++ return 0; ++ ++ fb_blank = *(int *)evdata->data; ++ jbt = container_of(self, struct jbt_info, fb_notif); ++ ++ switch (fb_blank) { ++ case FB_BLANK_UNBLANK: ++ case FB_BLANK_NORMAL: ++ jbt6k74_enter_state(jbt, JBT_STATE_NORMAL); ++ jbt6k74_display_onoff(jbt, 1); ++ break; ++ case FB_BLANK_VSYNC_SUSPEND: ++ case FB_BLANK_HSYNC_SUSPEND: ++ /* FIXME: we disable SLEEP since it would result in ++ * a visible artefact (white screen) before the backlight ++ * is dimmed to a dark enough level */ ++ /* jbt6k74_enter_state(jbt, JBT_STATE_SLEEP); */ ++ break; ++ case FB_BLANK_POWERDOWN: ++ jbt6k74_enter_state(jbt, JBT_STATE_DEEP_STANDBY); ++ break; ++ } ++ ++ return 0; ++} ++ + /* linux device model infrastructure */ + + static int __devinit jbt_probe(struct spi_device *spi) +@@ -595,8 +633,17 @@ static int __devinit jbt_probe(struct spi_device *spi) + goto err_off; + } + ++ jbt->fb_notif.notifier_call = fb_notifier_callback; ++ rc = fb_register_client(&jbt->fb_notif); ++ if (rc < 0) { ++ dev_err(&spi->dev, "cannot register notifier\n"); ++ goto err_sysfs; ++ } ++ + return 0; + ++err_sysfs: ++ sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group); + err_off: + jbt6k74_display_onoff(jbt, 0); + err_standby: +@@ -615,6 +662,7 @@ static int __devexit jbt_remove(struct spi_device *spi) + /* We don't want to switch off the display in case the user + * accidentially onloads the module (whose use count normally is 0) */ + ++ fb_unregister_client(&jbt->fb_notif); + sysfs_remove_group(&spi->dev.kobj, &jbt_attr_group); + dev_set_drvdata(&spi->dev, NULL); + kfree(jbt); +-- +1.5.6.5 + |