diff options
| author | Douglas Anderson <dianders@chromium.org> | 2024-05-03 14:33:08 -0700 |
|---|---|---|
| committer | Douglas Anderson <dianders@chromium.org> | 2024-05-28 13:09:11 -0700 |
| commit | bc62654df3c888dec735343f5db9907ac93aea60 (patch) | |
| tree | 9443d701ba6ad9ed8fb54c039c6605ce85b77380 /drivers/gpu | |
| parent | 2a1c99d7159b798288bfb20a76c1e665e2344126 (diff) | |
drm/panel: simple: Add a comment about unprepare+disable at shutdown/remove
It's the responsibility of a correctly written DRM modeset driver to
call drm_atomic_helper_shutdown() at shutdown time and that should be
disabling / unpreparing the panel if needed. Panel drivers shouldn't
be calling these functions themselves.
A recent effort was made to fix as many DRM modeset drivers as
possible [1] [2] [3] and most drivers are fixed now.
Unfortunately, it's very difficult to know exactly which DRM modeset
drivers are using panel-simple due to the sheer number of panels it
handles. For now, we'll leave the calls and just add a comment to keep
people from copying this code.
[1] https://lore.kernel.org/r/20230901234015.566018-1-dianders@chromium.org
[2] https://lore.kernel.org/r/20230901234202.566951-1-dianders@chromium.org
[3] https://lore.kernel.org/r/20230921192749.1542462-1-dianders@chromium.org
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240503143327.RFT.v2.27.I639183ac987e139092491a94e22d46a5d857580c@changeid
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-simple.c | 33 |
1 files changed, 23 insertions, 10 deletions
diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c index df32284fa293..9b9e078ec8aa 100644 --- a/drivers/gpu/drm/panel/panel-simple.c +++ b/drivers/gpu/drm/panel/panel-simple.c @@ -716,26 +716,39 @@ free_ddc: return err; } -static void panel_simple_remove(struct device *dev) +static void panel_simple_shutdown(struct device *dev) { struct panel_simple *panel = dev_get_drvdata(dev); - drm_panel_remove(&panel->base); + /* + * NOTE: the following two calls don't really belong here. It is the + * responsibility of a correctly written DRM modeset driver to call + * drm_atomic_helper_shutdown() at shutdown time and that should + * cause the panel to be disabled / unprepared if needed. For now, + * however, we'll keep these calls due to the sheer number of + * different DRM modeset drivers used with panel-simple. The fact that + * we're calling these and _also_ the drm_atomic_helper_shutdown() + * will try to disable/unprepare means that we can get a warning about + * trying to disable/unprepare an already disabled/unprepared panel, + * but that's something we'll have to live with until we've confirmed + * that all DRM modeset drivers are properly calling + * drm_atomic_helper_shutdown(). + */ drm_panel_disable(&panel->base); drm_panel_unprepare(&panel->base); - - pm_runtime_dont_use_autosuspend(dev); - pm_runtime_disable(dev); - if (panel->ddc) - put_device(&panel->ddc->dev); } -static void panel_simple_shutdown(struct device *dev) +static void panel_simple_remove(struct device *dev) { struct panel_simple *panel = dev_get_drvdata(dev); - drm_panel_disable(&panel->base); - drm_panel_unprepare(&panel->base); + drm_panel_remove(&panel->base); + panel_simple_shutdown(dev); + + pm_runtime_dont_use_autosuspend(dev); + pm_runtime_disable(dev); + if (panel->ddc) + put_device(&panel->ddc->dev); } static const struct drm_display_mode ampire_am_1280800n3tzqw_t00h_mode = { |