Messages in this thread Patch in this message | | | From | pingshuo <> | Subject | [PATCH] hibernation:stop resume screen during hibernation | Date | Tue, 22 Jun 2021 20:45:47 +0800 |
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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
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