From: pingshuo <pingshuo@uniontech.com>
To: rjw@rjwysocki.net, len.brown@intel.com, pavel@ucw.cz,
gregkh@linuxfoundation.org, linux-pm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, pingshuo <pingshuo@uniontech.com>
Subject: [PATCH] hibernation:stop resume screen during hibernation
Date: Tue, 22 Jun 2021 20:45:47 +0800 [thread overview]
Message-ID: <20210622124547.28317-1-pingshuo@uniontech.com> (raw)
The display will be woken up during hibernation.
if the computer equipment is poor, it will cause the screen to flicker.
Skip to reusme the display devices in "thaw".
Signed-off-by: pingshuo <pingshuo@uniontech.com>
---
drivers/base/power/main.c | 43 +++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
index f893c3c5af07..f3e92ac7b4b3 100644
--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -35,11 +35,14 @@
#include <linux/cpuidle.h>
#include <linux/devfreq.h>
#include <linux/timer.h>
+#include <linux/pci.h>
#include "../base.h"
#include "power.h"
typedef int (*pm_callback_t)(struct device *);
+#define VIDEO_PCI_CLASS 0x030000
+#define VIDEO_PCI_CLASS_VALID 0xff0000
#define list_for_each_entry_rcu_locked(pos, head, member) \
list_for_each_entry_rcu(pos, head, member, \
@@ -693,6 +696,40 @@ static void async_resume_noirq(void *data, async_cookie_t cookie)
put_device(dev);
}
+/**
+ * dpm_resume_skip_display_devices - Skip to reusme the display devices.
+ * @dev: Device to handle.
+ * @state: PM transition of the system being carried out.
+ *
+ * Delete the display devices from the wake-up list during the "thaw".
+ */
+static int dpm_resume_skip_display_devices(struct device *dev, pm_message_t state)
+{
+ struct pci_dev *pci_test = to_pci_dev(dev);
+
+ if (state.event == PM_EVENT_THAW) {
+ /*
+ * Filter out the display devices
+ */
+ if ((pci_test && ((pci_test->class & VIDEO_PCI_CLASS_VALID) == VIDEO_PCI_CLASS)) ||
+ (dev->driver && dev->driver->name &&
+ strncmp(dev->driver->name, "video", 6) == 0)) {
+
+ pr_info("Skip the display devices during the thaw.");
+ /*
+ * Remove the display devices from the resume stage
+ */
+ list_del(&dev->power.entry);
+ /*
+ * Remove the display devices from the power down stage
+ */
+ list_del(&dev->kobj.entry);
+ return 1;
+ }
+ }
+ return 0;
+}
+
static void dpm_noirq_resume_devices(pm_message_t state)
{
struct device *dev;
@@ -713,6 +750,10 @@ static void dpm_noirq_resume_devices(pm_message_t state)
while (!list_empty(&dpm_noirq_list)) {
dev = to_device(dpm_noirq_list.next);
get_device(dev);
+
+ if (dpm_resume_skip_display_devices(dev, state))
+ continue;
+
list_move_tail(&dev->power.entry, &dpm_late_early_list);
mutex_unlock(&dpm_list_mtx);
@@ -737,6 +778,8 @@ static void dpm_noirq_resume_devices(pm_message_t state)
trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false);
}
+
+
/**
* dpm_resume_noirq - Execute "noirq resume" callbacks for all devices.
* @state: PM transition of the system being carried out.
--
2.20.1
next reply other threads:[~2021-06-22 12:46 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-22 12:45 pingshuo [this message]
2021-06-22 13:06 ` [PATCH] hibernation:stop resume screen during hibernation Rafael J. Wysocki
2021-06-22 13:47 ` Pavel Machek
2021-06-24 2:06 ` pingshuo
2021-06-22 13:19 ` Greg KH
-- strict thread matches above, loose matches on Subject: below --
2021-06-22 8:38 pingshuo
2021-06-22 10:22 ` Greg KH
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