linux-kernel - [PATCH v6 5/6] drm/log: Implement suspend/resume

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Message-ID: <20241105125109.226866-6-jfalempe@redhat.com>
Date: Tue,  5 Nov 2024 13:42:25 +0100
From: Jocelyn Falempe <jfalempe@...hat.com>
To: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Daniel Vetter <daniel@...ll.ch>,
	John Ogness <john.ogness@...utronix.de>,
	Javier Martinez Canillas <javierm@...hat.com>,
	"Guilherme G . Piccoli" <gpiccoli@...lia.com>,
	bluescreen_avenger@...izon.net,
	Caleb Connolly <caleb.connolly@...aro.org>,
	Petr Mladek <pmladek@...e.com>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Cc: Jocelyn Falempe <jfalempe@...hat.com>
Subject: [PATCH v6 5/6] drm/log: Implement suspend/resume

Normally the console is already suspended when the graphic driver
suspend callback is called, but if the parameter no_console_suspend
is set, it might still be active.
So call console_stop()/console_start() in the suspend/resume
callbacks, to make sure it won't try to write to the framebuffer
while the graphic driver is suspended.

Signed-off-by: Jocelyn Falempe <jfalempe@...hat.com>
---

v6:
 * Use console_stop() and console_start() in the suspend/resume callback (Petr Mladek).

 drivers/gpu/drm/drm_log.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/drm_log.c b/drivers/gpu/drm/drm_log.c
index 635dff7b37ce5..e6900c6b96436 100644
--- a/drivers/gpu/drm/drm_log.c
+++ b/drivers/gpu/drm/drm_log.c
@@ -310,10 +310,30 @@ static int drm_log_client_hotplug(struct drm_client_dev *client)
 	return 0;
 }
 
+static int drm_log_client_suspend(struct drm_client_dev *client, bool _console_lock)
+{
+	struct drm_log *dlog = client_to_drm_log(client);
+
+	console_stop(&dlog->con);
+
+	return 0;
+}
+
+static int drm_log_client_resume(struct drm_client_dev *client, bool _console_lock)
+{
+	struct drm_log *dlog = client_to_drm_log(client);
+
+	console_start(&dlog->con);
+
+	return 0;
+}
+
 static const struct drm_client_funcs drm_log_client_funcs = {
 	.owner		= THIS_MODULE,
 	.unregister	= drm_log_client_unregister,
 	.hotplug	= drm_log_client_hotplug,
+	.suspend	= drm_log_client_suspend,
+	.resume		= drm_log_client_resume,
 };
 
 static void drm_log_write_thread(struct console *con, struct nbcon_write_context *wctxt)
-- 
2.47.0