On Tue, May 9, 2017 at 9:02 AM, Lv Zheng <lv.zheng@xxxxxxxxx> wrote:
> 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.
If the only 2 users of acpi_lid_open() are intel and nouveau, and if
they should rely on the value stored in the input node, not the one
exported by the _LID method (which can be wrong on some platforms),
how about simply changing the implementation of acpi_lid_open() to
fetch the value from the input node directly?
Cheers,
Benjamin
>
> Cc: <intel-gfx@xxxxxxxxxxxxxxxxxxxxx>
> Cc: <nouveau@xxxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Lv Zheng <lv.zheng@xxxxxxxxx>
> ---
> 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
>
> --
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