On Fri, Mar 6, 2015 at 7:36 AM, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote:
> Since the beginning, sysfs/connector/status has done a heavyweight
> detection of the current connector status. But no user, such as upowerd
> or logind, has ever desired to initiate a probe. Move the probing into a
> new attribute so that existing readers get the behaviour they desire.
>
> v2: David Herrmann suggested using "echo detect > /sys/.../status" to
> trigger the probing, which is a fine idea. This extends that to also
> allow the user to apply the force detection overrides at runtime.
>
> v3: Now with airlied's email address fixed! Requires sysfs_streq()
>
> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Cc: David Herrmann <dh.herrmann@xxxxxxxxx>
> Cc: Dave Airlie <airlied@xxxxxxxxxx>
> Cc: Alex Deucher <alexdeucher@xxxxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
> ---
> drivers/gpu/drm/drm_sysfs.c | 61 +++++++++++++++++++++++++++++++++++++++------
> 1 file changed, 53 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
> index 5c99d3773212..ffc305fc2076 100644
> --- a/drivers/gpu/drm/drm_sysfs.c
> +++ b/drivers/gpu/drm/drm_sysfs.c
> @@ -166,23 +166,68 @@ void drm_sysfs_destroy(void)
> /*
> * Connector properties
> */
> -static ssize_t status_show(struct device *device,
> +static ssize_t status_store(struct device *device,
> struct device_attribute *attr,
> - char *buf)
> + const char *buf, size_t count)
> {
> struct drm_connector *connector = to_drm_connector(device);
> - enum drm_connector_status status;
> + struct drm_device *dev = connector->dev;
> + enum drm_connector_status old_status;
> int ret;
>
> - ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
> + ret = mutex_lock_interruptible(&dev->mode_config.mutex);
> if (ret)
> return ret;
>
> - status = connector->funcs->detect(connector, true);
> - mutex_unlock(&connector->dev->mode_config.mutex);
> + old_status = connector->status;
> +
> + if (sysfs_streq(buf, "detect")) {
> + connector->force = 0;
> + connector->status = connector->funcs->detect(connector, true);
> + } else if (sysfs_streq(buf, "on")) {
> + connector->force = DRM_FORCE_ON;
> + } else if (sysfs_streq(buf, "on-digital")) {
> + connector->force = DRM_FORCE_ON_DIGITAL;
> + } else if (sysfs_streq(buf, "off")) {
> + connector->force = DRM_FORCE_OFF;
> + } else
> + ret = -EINVAL;
> +
> + if (ret == 0 && connector->force) {
> + if (connector->force == DRM_FORCE_ON ||
> + connector->force == DRM_FORCE_ON_DIGITAL)
> + connector->status = connector_status_connected;
> + else
> + connector->status = connector_status_disconnected;
> + if (connector->funcs->force)
> + connector->funcs->force(connector);
> + }
> +
> + if (old_status != connector->status) {
> + DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n",
> + connector->base.id,
> + connector->name,
> + old_status, connector->status);
> +
> + dev->mode_config.delayed_event = true;
> + if (dev->mode_config.poll_enabled)
> + schedule_delayed_work(&dev->mode_config.output_poll_work,
> + 0);
> + }
> +
> + mutex_unlock(&dev->mode_config.mutex);
> +
> + return ret;
> +}
> +
> +static ssize_t status_show(struct device *device,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct drm_connector *connector = to_drm_connector(device);
>
> return snprintf(buf, PAGE_SIZE, "%s\n",
> - drm_get_connector_status_name(status));
> + drm_get_connector_status_name(connector->status));
> }
>
> static ssize_t dpms_show(struct device *device,
> @@ -339,7 +384,7 @@ static ssize_t select_subconnector_show(struct device *device,
> drm_get_dvi_i_select_name((int)subconnector));
> }
>
> -static DEVICE_ATTR_RO(status);
> +static DEVICE_ATTR_RW(status);
> static DEVICE_ATTR_RO(enabled);
> static DEVICE_ATTR_RO(dpms);
> static DEVICE_ATTR_RO(modes);
> --
> 2.1.4
>
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