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Subject[PATCH] video: hyperv_fb: Add the support of hibernation
Date
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=hyperv-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_fb.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>

#include <linux/hyperv.h>

@@ -211,6 +212,7 @@ struct hvfb_par {

struct delayed_work dwork;
bool update;
+ bool update_saved; /* The value of 'update' before hibernation */

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;
}

+static int hvfb_suspend(struct hv_device *hdev)
+{
+ struct fb_info *info = hv_get_drvdata(hdev);
+ struct hvfb_par *par = info->par;
+
+ console_lock();
+
+ /* 1 means do suspend */
+ fb_set_suspend(info, 1);
+
+ cancel_delayed_work_sync(&par->dwork);
+
+ par->update_saved = par->update;
+ par->update = false;
+ par->fb_ready = false;
+
+ vmbus_close(hdev->channel);
+
+ console_unlock();
+
+ return 0;
+}
+
+static int hvfb_resume(struct hv_device *hdev)
+{
+ struct fb_info *info = hv_get_drvdata(hdev);
+ struct hvfb_par *par = info->par;
+ int ret;
+
+ console_lock();
+
+ ret = synthvid_connect_vsp(hdev);
+ if (ret != 0)
+ goto out;
+
+ ret = synthvid_send_config(hdev);
+ if (ret != 0) {
+ vmbus_close(hdev->channel);
+ goto out;
+ }
+
+ par->fb_ready = true;
+ par->update = 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;
+}
+

static const struct pci_device_id pci_stub_id_table[] = {
{
@@ -901,6 +958,8 @@ static int hvfb_remove(struct hv_device *hdev)
.id_table = id_table,
.probe = hvfb_probe,
.remove = hvfb_remove,
+ .suspend = hvfb_suspend,
+ .resume = hvfb_resume,
.driver = {
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
--
1.8.3.1
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