[Nouveau] [PATCH v2 5/5] ACPI: button: Obselete acpi_lid_open() invocations

[Lv Zheng]

Since notification side has been changed to always notify kernel listeners
using _LID returning value. Now listeners needn't invoke acpi_lid_open(),
it should use a spec suggested control method lid device usage model:
register lid notification and use the notified value instead, which is the
only way to ensure the value is correct for "button.lid_init_state=ignore"
mode or other modes with "button.lid_fake_events=N" specified.

This patch fixes i915 driver to drop acpi_lid_open() user. It's not
possible to change nouveau_connector.c user using a simple way now. So this
patch only marks acpi_lid_open() as deprecated to accelerate this process
by indicating this change to the nouveau developers.

Cc: <intel-gfx at lists.freedesktop.org>
Cc: <nouveau at lists.freedesktop.org>
Signed-off-by: Lv Zheng <lv.zheng at intel.com>
---
 drivers/acpi/button.c             | 7 ++++++-
 drivers/gpu/drm/i915/intel_lvds.c | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 7ff3a75..50d7898 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -348,7 +348,12 @@ int acpi_lid_notifier_unregister(struct notifier_block *nb)
 }
 EXPORT_SYMBOL(acpi_lid_notifier_unregister);
 
-int acpi_lid_open(void)
+/*
+ * The intentional usage model is to register a lid notifier and use the
+ * notified value instead. Directly evaluating _LID without seeing a
+ * Notify(lid, 0x80) is not reliable.
+ */
+int __deprecated acpi_lid_open(void)
 {
 	if (!lid_device)
 		return -ENODEV;
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index 9ca4dc4..8ca9080 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -548,7 +548,7 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
 	/* Don't force modeset on machines where it causes a GPU lockup */
 	if (dmi_check_system(intel_no_modeset_on_lid))
 		goto exit;
-	if (!acpi_lid_open()) {
+	if (!val) {
 		/* do modeset on next lid open event */
 		dev_priv->modeset_restore = MODESET_ON_LID_OPEN;
 		goto exit;
-- 
2.7.4