Re: [PATCH v3] drm: Improve the output_poll_changed description

From: Thomas Zimmermann
Date: Mon Jan 18 2021 - 01:54:30 EST


Hi

Am 18.01.21 um 02:22 schrieb ZhiJie.Zhang:
From: zhangzhijie <zhangzhijie@xxxxxxxxxxx>

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@xxxxxxxxxxx>
Signed-off-by: ZhiJie.Zhang <zhangzhijie@xxxxxxxxxxx>
---
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

I don't understand this. Maybe it's "Drivers implementing fbdev emulation use drm_kms_helper_hotplug_event() to call ..." ?

Best regards
Thomas

* 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);


--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

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