diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2023-03-26 23:54:33 +0300 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2023-03-29 13:02:47 +0300 |
| commit | 30fb97ba4a8e082ba0a5432479d6995472edbd7b (patch) | |
| tree | 6859c35e887d8b2230d104e7d6971ffe8bafcc28 /drivers/gpu | |
| parent | 34224133458ca48caf2b57df335e870f1abb7af5 (diff) | |
| download | linux-30fb97ba4a8e082ba0a5432479d6995472edbd7b.tar.xz | |
drm/nouveau/kms: Fix backlight registration
The nouveau code used to call drm_fb_helper_initial_config() from
nouveau_fbcon_init() before calling drm_dev_register(). This would
probe all connectors so that drm_connector->status could be used during
backlight registration which runs from nouveau_connector_late_register().
After commit 4a16dd9d18a0 ("drm/nouveau/kms: switch to drm fbdev helpers")
the fbdev emulation code, which now is a drm-client, can only run after
drm_dev_register(). So during backlight registration the connectors are
not probed yet and the drm_connector->status == connected check in
nv50_backlight_init() would now always fail.
Replace the drm_connector->status == connected check with
a drm_helper_probe_detect() == connected check to fix nv_backlight
no longer getting registered because of this.
Fixes: 4a16dd9d18a0 ("drm/nouveau/kms: switch to drm fbdev helpers")
Link: https://gitlab.freedesktop.org/drm/nouveau/-/issues/202
Link: https://bugzilla.redhat.com/show_bug.cgi?id=2181941
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230326205433.36485-1-hdegoede@redhat.com
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_backlight.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c b/drivers/gpu/drm/nouveau/nouveau_backlight.c index 40409a29f5b6..91b5ecc57538 100644 --- a/drivers/gpu/drm/nouveau/nouveau_backlight.c +++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c @@ -33,6 +33,7 @@ #include <linux/apple-gmux.h> #include <linux/backlight.h> #include <linux/idr.h> +#include <drm/drm_probe_helper.h> #include "nouveau_drv.h" #include "nouveau_reg.h" @@ -299,8 +300,12 @@ nv50_backlight_init(struct nouveau_backlight *bl, struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); struct nvif_object *device = &drm->client.device.object; + /* + * Note when this runs the connectors have not been probed yet, + * so nv_conn->base.status is not set yet. + */ if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1)) || - nv_conn->base.status != connector_status_connected) + drm_helper_probe_detect(&nv_conn->base, NULL, false) != connector_status_connected) return -ENODEV; if (nv_conn->type == DCB_CONNECTOR_eDP) { |