Change the backlight device names from intel_backlight to card%d-%s-backlight format, for example card0-eDP-1-backlight, to make them unique. Otherwise, registering multiple backlight devices with intel_backlight name will fail, regardless of whether they're two connectors in the same device or two different devices.
Cc: Ville Syrjälä <[email protected]> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2794 Signed-off-by: Jani Nikula <[email protected]> --- Is the name "intel_backlight" part of the UABI? In theory the userspace should only look at the names and types available under /sys/class/backlight, not the exact names. --- drivers/gpu/drm/i915/display/intel_panel.c | 29 ++++++++++++++-------- 1 file changed, 18 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_panel.c b/drivers/gpu/drm/i915/display/intel_panel.c index 10022d1575e1..5ebf8cb0e8e3 100644 --- a/drivers/gpu/drm/i915/display/intel_panel.c +++ b/drivers/gpu/drm/i915/display/intel_panel.c @@ -1372,6 +1372,8 @@ int intel_backlight_device_register(struct intel_connector *connector) struct drm_i915_private *i915 = to_i915(connector->base.dev); struct intel_panel *panel = &connector->panel; struct backlight_properties props; + const char *name; + int ret = 0; if (WARN_ON(panel->backlight.device)) return -ENODEV; @@ -1398,28 +1400,33 @@ int intel_backlight_device_register(struct intel_connector *connector) else props.power = FB_BLANK_POWERDOWN; - /* - * Note: using the same name independent of the connector prevents - * registration of multiple backlight devices in the driver. - */ + name = kasprintf(GFP_KERNEL, "card%d-%s-backlight", i915->drm.primary->index, + connector->base.name); + if (!name) + return -ENOMEM; + panel->backlight.device = - backlight_device_register("intel_backlight", + backlight_device_register(name, connector->base.kdev, connector, &intel_backlight_device_ops, &props); if (IS_ERR(panel->backlight.device)) { - drm_err(&i915->drm, "Failed to register backlight: %ld\n", - PTR_ERR(panel->backlight.device)); + drm_err(&i915->drm, "Failed to register backlight %s: %ld\n", + name, PTR_ERR(panel->backlight.device)); panel->backlight.device = NULL; - return -ENODEV; + ret = -ENODEV; + goto out; } drm_dbg_kms(&i915->drm, - "Connector %s backlight sysfs interface registered\n", - connector->base.name); + "Connector %s backlight sysfs interface %s registered\n", + name, connector->base.name); - return 0; +out: + kfree(name); + + return ret; } void intel_backlight_device_unregister(struct intel_connector *connector) -- 2.20.1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
