linux-kernel - [PATCH v3] drm: Improve the output_poll

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Date:   Mon, 18 Jan 2021 09:22:46 +0800
From:   "ZhiJie.Zhang" <zhangzhijie@...ngson.cn>
To:     daniel@...ll.ch, maarten.lankhorst@...ux.intel.com,
        mripard@...nel.org, tzimmermann@...e.de, airlied@...ux.ie
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        zhangzhijie@...ngson.cn
Subject: [PATCH v3] drm: Improve the output_poll_changed description

From: zhangzhijie <zhangzhijie@...ngson.cn>

this callback was used by drm_kms_helper_hotplug_event()

V2: (Thanks for Daniel's suggestions)
- remove the FIXME below.since with the drm_client
- infrastructure and the generic fbdev emulation we've
- resolved this all very neatly now.

V3: Add comments that This hook is deprecated
- new implementation methods instead of this hook

Signed-off-by: zhangzhijie <zhangzhijie@...ngson.cn>
Signed-off-by: ZhiJie.Zhang <zhangzhijie@...ngson.cn>
---
 include/drm/drm_mode_config.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index ab424ddd7665..a084482d579a 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -103,14 +103,14 @@ struct drm_mode_config_funcs {
 	 * Callback used by helpers to inform the driver of output configuration
 	 * changes.
 	 *
-	 * Drivers implementing fbdev emulation with the helpers can call
-	 * drm_fb_helper_hotplug_changed from this hook to inform the fbdev
+	 * Drivers implementing fbdev emulation with the helpers. Drivers use
+	 * drm_kms_helper_hotplug_event() to call this hook to inform the fbdev
 	 * helper of output changes.
 	 *
-	 * FIXME:
-	 *
-	 * Except that there's no vtable for device-level helper callbacks
-	 * there's no reason this is a core function.
+	 * This hook is deprecated, drivers should instead use
+	 * drm_fbdev_generic_setup() which takes care of any necessary
+	 * hotplug event forwarding already without further involvement by
+	 * the driver.
 	 */
 	void (*output_poll_changed)(struct drm_device *dev);
 
-- 
2.29.2