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[v3,23/23] drm/fb-helper: Clarify use of last_close and output_poll_changed

Message ID 20221103151446.2638-24-tzimmermann@suse.de
State Accepted
Commit 78a77c9f494829089d74afc60286c555efa0646a
Headers show
Series drm/fb-helper: Untangle fbdev emulation and helpers | expand

Commit Message

Thomas Zimmermann Nov. 3, 2022, 3:14 p.m. UTC 
Clarify documentation in the use of struct drm_driver.last_close and
struct drm_mode_config_funcs.output_poll_changed. Those callbacks should
not be said for fbdev implementations on top of struct drm_client_funcs.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
---
 drivers/gpu/drm/drm_fb_helper.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Comments

Javier Martinez Canillas Nov. 4, 2022, 10:38 a.m. UTC | #1 
On 11/3/22 16:14, Thomas Zimmermann wrote:
> Clarify documentation in the use of struct drm_driver.last_close and
> struct drm_mode_config_funcs.output_poll_changed. Those callbacks should
> not be said for fbdev implementations on top of struct drm_client_funcs.
> 
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
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Patch

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 5eb2f0d4bf8d4..e0384f967c0b3 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -89,11 +89,13 @@  static DEFINE_MUTEX(kernel_fb_helper_lock);
  * It will automatically set up deferred I/O if the driver requires a shadow
  * buffer.
  *
- * At runtime drivers should restore the fbdev console by using
+ * Existing fbdev implementations should restore the fbdev console by using
  * drm_fb_helper_lastclose() as their &drm_driver.lastclose callback.
  * They should also notify the fb helper code from updates to the output
  * configuration by using drm_fb_helper_output_poll_changed() as their
- * &drm_mode_config_funcs.output_poll_changed callback.
+ * &drm_mode_config_funcs.output_poll_changed callback. New implementations
+ * of fbdev should be build on top of struct &drm_client_funcs, which handles
+ * this automatically. Setting the old callbacks should be avoided.
  *
  * For suspend/resume consider using drm_mode_config_helper_suspend() and
  * drm_mode_config_helper_resume() which takes care of fbdev as well.