From a6c0fd3d5a8bac08b0d79301be23f961e9038d60 Mon Sep 17 00:00:00 2001
From: Kai-Heng Feng <kai.heng.feng@canonical.com>
Date: Fri, 29 Jan 2021 16:43:27 +0800
Subject: [PATCH] efifb: Ensure graphics device for efifb stays at PCI D0

We are seeing root ports on some desktop boards support D3cold for
discrete graphics card. So when efifb is in use while graphics device
isn't bound to a driver, PCI and ACPI will put the graphics to D3cold
when runtime suspend kicks in, makes efifb stop working.

So ensure the graphics device won't be runtime suspended, to keep efifb
work all the time.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210129084327.986630-1-kai.heng.feng@canonical.com
---
 drivers/video/fbdev/efifb.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c
index b80ba3d2a9b8..f58a545b3bf3 100644
--- a/drivers/video/fbdev/efifb.c
+++ b/drivers/video/fbdev/efifb.c
@@ -16,6 +16,7 @@
 #include <linux/platform_device.h>
 #include <linux/printk.h>
 #include <linux/screen_info.h>
+#include <linux/pm_runtime.h>
 #include <video/vga.h>
 #include <asm/efi.h>
 #include <drm/drm_utils.h> /* For drm_get_panel_orientation_quirk */
@@ -574,6 +575,7 @@ static int efifb_probe(struct platform_device *dev)
 		goto err_fb_dealoc;
 	}
 	fb_info(info, "%s frame buffer device\n", info->fix.id);
+	pm_runtime_get_sync(&efifb_pci_dev->dev);
 	return 0;
 
 err_fb_dealoc:
@@ -600,6 +602,7 @@ static int efifb_remove(struct platform_device *pdev)
 	unregister_framebuffer(info);
 	sysfs_remove_groups(&pdev->dev.kobj, efifb_groups);
 	framebuffer_release(info);
+	pm_runtime_put(&efifb_pci_dev->dev);
 
 	return 0;
 }
-- 
2.11.0