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From:   Dexuan Cui <decui@microsoft.com>
To:     KY Srinivasan <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        "sashal@kernel.org" <sashal@kernel.org>,
        "b.zolnierkie@samsung.com" <b.zolnierkie@samsung.com>,
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        "linux-fbdev@vger.kernel.org" <linux-fbdev@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Michael Kelley <mikelley@microsoft.com>
CC:     Dexuan Cui <decui@microsoft.com>
Subject: [PATCH] video: hyperv_fb: Add the support of hibernation
Thread-Topic: [PATCH] video: hyperv_fb: Add the support of hibernation
Thread-Index: AQHVaPlpoGmoU9RhmUGZUZsMyZEthw==
Date:   Wed, 11 Sep 2019 23:34:10 +0000
Message-ID: <1568244833-66476-1-git-send-email-decui@microsoft.com>
Reply-To: Dexuan Cui <decui@microsoft.com>
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This patch depends on the vmbus side change of the definition of
struct hv_driver.

Signed-off-by: Dexuan Cui <decui@microsoft.com>
---

This patch is basically a pure Hyper-V specific change and it has a
build dependency on the commit 271b2224d42f ("Drivers: hv: vmbus: Implement
suspend/resume for VSC drivers for hibernation"), which is on Sasha Levin's
Hyper-V tree's hyperv-next branch:
https://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git/log/?h=3Dh=
yperv-next

I request this patch should go through Sasha's tree rather than the
fbdev tree.

 drivers/video/fbdev/hyperv_fb.c | 59 +++++++++++++++++++++++++++++++++++++=
++++
 1 file changed, 59 insertions(+)

diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_f=
b.c
index 2dcb7c5..fe4731f 100644
--- a/drivers/video/fbdev/hyperv_fb.c
+++ b/drivers/video/fbdev/hyperv_fb.c
@@ -34,6 +34,7 @@
 #include <linux/fb.h>
 #include <linux/pci.h>
 #include <linux/efi.h>
+#include <linux/console.h>
=20
 #include <linux/hyperv.h>
=20
@@ -211,6 +212,7 @@ struct hvfb_par {
=20
 	struct delayed_work dwork;
 	bool update;
+	bool update_saved; /* The value of 'update' before hibernation */
=20
 	u32 pseudo_palette[16];
 	u8 init_buf[MAX_VMBUS_PKT_SIZE];
@@ -878,6 +880,61 @@ static int hvfb_remove(struct hv_device *hdev)
 	return 0;
 }
=20
+static int hvfb_suspend(struct hv_device *hdev)
+{
+	struct fb_info *info =3D hv_get_drvdata(hdev);
+	struct hvfb_par *par =3D info->par;
+
+	console_lock();
+
+	/* 1 means do suspend */
+	fb_set_suspend(info, 1);
+
+	cancel_delayed_work_sync(&par->dwork);
+
+	par->update_saved =3D par->update;
+	par->update =3D false;
+	par->fb_ready =3D false;
+
+	vmbus_close(hdev->channel);
+
+	console_unlock();
+
+	return 0;
+}
+
+static int hvfb_resume(struct hv_device *hdev)
+{
+	struct fb_info *info =3D hv_get_drvdata(hdev);
+	struct hvfb_par *par =3D info->par;
+	int ret;
+
+	console_lock();
+
+	ret =3D synthvid_connect_vsp(hdev);
+	if (ret !=3D 0)
+		goto out;
+
+	ret =3D synthvid_send_config(hdev);
+	if (ret !=3D 0) {
+		vmbus_close(hdev->channel);
+		goto out;
+	}
+
+	par->fb_ready =3D true;
+	par->update =3D par->update_saved;
+
+	schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);
+
+	/* 0 means do resume */
+	fb_set_suspend(info, 0);
+
+out:
+	console_unlock();
+
+	return ret;
+}
+
=20
 static const struct pci_device_id pci_stub_id_table[] =3D {
 	{
@@ -901,6 +958,8 @@ static int hvfb_remove(struct hv_device *hdev)
 	.id_table =3D id_table,
 	.probe =3D hvfb_probe,
 	.remove =3D hvfb_remove,
+	.suspend =3D hvfb_suspend,
+	.resume =3D hvfb_resume,
 	.driver =3D {
 		.probe_type =3D PROBE_PREFER_ASYNCHRONOUS,
 	},
--=20
1.8.3.1