diff options
Diffstat (limited to 'target/linux/goldfish/patches-2.6.30/0072-PM-earlysuspend-Removing-dependence-on-console.patch')
| -rw-r--r-- | target/linux/goldfish/patches-2.6.30/0072-PM-earlysuspend-Removing-dependence-on-console.patch | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/target/linux/goldfish/patches-2.6.30/0072-PM-earlysuspend-Removing-dependence-on-console.patch b/target/linux/goldfish/patches-2.6.30/0072-PM-earlysuspend-Removing-dependence-on-console.patch new file mode 100644 index 000000000..489cfc0f4 --- /dev/null +++ b/target/linux/goldfish/patches-2.6.30/0072-PM-earlysuspend-Removing-dependence-on-console.patch @@ -0,0 +1,217 @@ +From ba801aa66e869f1f9f9d3a1610a2165baa024e4b Mon Sep 17 00:00:00 2001 +From: Rebecca Schultz <rschultz@google.com> +Date: Thu, 17 Jul 2008 18:14:55 -0700 +Subject: [PATCH 072/134] PM: earlysuspend: Removing dependence on console. +MIME-Version: 1.0 +Content-Type: text/plain; charset=utf-8 +Content-Transfer-Encoding: 8bit + +Rather than signaling a full update of the display from userspace via a +console switch, this patch introduces 2 files int /sys/power, +wait_for_fb_sleep and wait_for_fb_wake. Reading these files will block +until the requested state has been entered. When a read from +wait_for_fb_sleep returns userspace should stop drawing. When +wait_for_fb_wake returns, it should do a full update. If either are called +when the fb driver is already in the requested state, they will return +immediately. + +Signed-off-by: Rebecca Schultz <rschultz@google.com> +Signed-off-by: Arve Hjønnevåg <arve@android.com> +--- + kernel/power/Kconfig | 9 +++ + kernel/power/Makefile | 1 + + kernel/power/fbearlysuspend.c | 153 +++++++++++++++++++++++++++++++++++++++++ + 3 files changed, 163 insertions(+), 0 deletions(-) + create mode 100644 kernel/power/fbearlysuspend.c + +--- a/kernel/power/Kconfig ++++ b/kernel/power/Kconfig +@@ -159,6 +159,7 @@ config EARLYSUSPEND + + choice + prompt "User-space screen access" ++ default FB_EARLYSUSPEND if !FRAMEBUFFER_CONSOLE + default CONSOLE_EARLYSUSPEND + depends on HAS_EARLYSUSPEND + +@@ -172,6 +173,14 @@ choice + Register early suspend handler to perform a console switch to + when user-space should stop drawing to the screen and a switch + back when it should resume. ++ ++ config FB_EARLYSUSPEND ++ bool "Sysfs interface" ++ depends on HAS_EARLYSUSPEND ++ ---help--- ++ Register early suspend handler that notifies and waits for ++ user-space through sysfs when user-space should stop drawing ++ to the screen and notifies user-space when it should resume. + endchoice + + config HIBERNATION +--- a/kernel/power/Makefile ++++ b/kernel/power/Makefile +@@ -10,6 +10,7 @@ obj-$(CONFIG_WAKELOCK) += wakelock.o + obj-$(CONFIG_USER_WAKELOCK) += userwakelock.o + obj-$(CONFIG_EARLYSUSPEND) += earlysuspend.o + obj-$(CONFIG_CONSOLE_EARLYSUSPEND) += consoleearlysuspend.o ++obj-$(CONFIG_FB_EARLYSUSPEND) += fbearlysuspend.o + obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o + + obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o +--- /dev/null ++++ b/kernel/power/fbearlysuspend.c +@@ -0,0 +1,153 @@ ++/* kernel/power/fbearlysuspend.c ++ * ++ * Copyright (C) 2005-2008 Google, Inc. ++ * ++ * This software is licensed under the terms of the GNU General Public ++ * License version 2, as published by the Free Software Foundation, and ++ * may be copied, distributed, and modified under those terms. ++ * ++ * This program is distributed in the hope that it will be useful, ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ++ * GNU General Public License for more details. ++ * ++ */ ++ ++#include <linux/earlysuspend.h> ++#include <linux/module.h> ++#include <linux/wait.h> ++ ++#include "power.h" ++ ++static wait_queue_head_t fb_state_wq; ++static DEFINE_SPINLOCK(fb_state_lock); ++static enum { ++ FB_STATE_STOPPED_DRAWING, ++ FB_STATE_REQUEST_STOP_DRAWING, ++ FB_STATE_DRAWING_OK, ++} fb_state; ++ ++/* tell userspace to stop drawing, wait for it to stop */ ++static void stop_drawing_early_suspend(struct early_suspend *h) ++{ ++ int ret; ++ unsigned long irq_flags; ++ ++ spin_lock_irqsave(&fb_state_lock, irq_flags); ++ fb_state = FB_STATE_REQUEST_STOP_DRAWING; ++ spin_unlock_irqrestore(&fb_state_lock, irq_flags); ++ ++ wake_up_all(&fb_state_wq); ++ ret = wait_event_timeout(fb_state_wq, ++ fb_state == FB_STATE_STOPPED_DRAWING, ++ HZ); ++ if (unlikely(fb_state != FB_STATE_STOPPED_DRAWING)) ++ pr_warning("stop_drawing_early_suspend: timeout waiting for " ++ "userspace to stop drawing\n"); ++} ++ ++/* tell userspace to start drawing */ ++static void start_drawing_late_resume(struct early_suspend *h) ++{ ++ unsigned long irq_flags; ++ ++ spin_lock_irqsave(&fb_state_lock, irq_flags); ++ fb_state = FB_STATE_DRAWING_OK; ++ spin_unlock_irqrestore(&fb_state_lock, irq_flags); ++ wake_up(&fb_state_wq); ++} ++ ++static struct early_suspend stop_drawing_early_suspend_desc = { ++ .level = EARLY_SUSPEND_LEVEL_STOP_DRAWING, ++ .suspend = stop_drawing_early_suspend, ++ .resume = start_drawing_late_resume, ++}; ++ ++static ssize_t wait_for_fb_sleep_show(struct kobject *kobj, ++ struct kobj_attribute *attr, char *buf) ++{ ++ char *s = buf; ++ int ret; ++ ++ ret = wait_event_interruptible(fb_state_wq, ++ fb_state != FB_STATE_DRAWING_OK); ++ if (ret && fb_state == FB_STATE_DRAWING_OK) ++ return ret; ++ else ++ s += sprintf(buf, "sleeping"); ++ return s - buf; ++} ++ ++static ssize_t wait_for_fb_wake_show(struct kobject *kobj, ++ struct kobj_attribute *attr, char *buf) ++{ ++ char *s = buf; ++ int ret; ++ unsigned long irq_flags; ++ ++ spin_lock_irqsave(&fb_state_lock, irq_flags); ++ if (fb_state == FB_STATE_REQUEST_STOP_DRAWING) { ++ fb_state = FB_STATE_STOPPED_DRAWING; ++ wake_up(&fb_state_wq); ++ } ++ spin_unlock_irqrestore(&fb_state_lock, irq_flags); ++ ++ ret = wait_event_interruptible(fb_state_wq, ++ fb_state == FB_STATE_DRAWING_OK); ++ if (ret && fb_state != FB_STATE_DRAWING_OK) ++ return ret; ++ else ++ s += sprintf(buf, "awake"); ++ ++ return s - buf; ++} ++ ++#define power_ro_attr(_name) \ ++static struct kobj_attribute _name##_attr = { \ ++ .attr = { \ ++ .name = __stringify(_name), \ ++ .mode = 0444, \ ++ }, \ ++ .show = _name##_show, \ ++ .store = NULL, \ ++} ++ ++power_ro_attr(wait_for_fb_sleep); ++power_ro_attr(wait_for_fb_wake); ++ ++static struct attribute *g[] = { ++ &wait_for_fb_sleep_attr.attr, ++ &wait_for_fb_wake_attr.attr, ++ NULL, ++}; ++ ++static struct attribute_group attr_group = { ++ .attrs = g, ++}; ++ ++static int __init android_power_init(void) ++{ ++ int ret; ++ ++ init_waitqueue_head(&fb_state_wq); ++ fb_state = FB_STATE_DRAWING_OK; ++ ++ ret = sysfs_create_group(power_kobj, &attr_group); ++ if (ret) { ++ pr_err("android_power_init: sysfs_create_group failed\n"); ++ return ret; ++ } ++ ++ register_early_suspend(&stop_drawing_early_suspend_desc); ++ return 0; ++} ++ ++static void __exit android_power_exit(void) ++{ ++ unregister_early_suspend(&stop_drawing_early_suspend_desc); ++ sysfs_remove_group(power_kobj, &attr_group); ++} ++ ++module_init(android_power_init); ++module_exit(android_power_exit); ++ |