On Fri, 03 May 2013, Imre Deak <imre.deak at intel.com> wrote:
> Currently the driver's assumed behavior for a modeset with an attached
> FB is that the corresponding connector will be switched to DPMS ON mode
> if it happened to be in DPMS OFF (or another power save mode). This
> wasn't enforced though if only the FB changed, everything else (format,
> connector etc.) remaining the same. In this case we only set the new FB
> base and left the connector in the old power save mode.
>
> Fix this by forcing a full modeset whenever there is an attached FB and
> any affected connector is in a power save mode.
>
> Signed-off-by: Imre Deak <imre.deak at intel.com>
> ---
> drivers/gpu/drm/i915/intel_display.c | 21 ++++++++++++++++++++-
> 1 file changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 2939524..0aee2ba 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -8380,6 +8380,21 @@ static void intel_set_config_restore_state(struct drm_device *dev,
> }
> }
>
> +static bool
> +crtc_connector_off(struct drm_crtc *crtc, struct drm_connector *connectors,
> + int num_connectors)
> +{
> + int i;
> +
> + for (i = 0; i < num_connectors; i++)
> + if (connectors[i].encoder &&
> + connectors[i].encoder->crtc == crtc &&
> + connectors[i].dpms != DRM_MODE_DPMS_ON)
> + return true;
> +
> + return false;
> +}
> +
> static void
> intel_set_config_compute_mode_changes(struct drm_mode_set *set,
> struct intel_set_config *config)
> @@ -8397,8 +8412,12 @@ intel_set_config_compute_mode_changes(struct drm_mode_set *set,
> } else if (set->fb->pixel_format !=
> set->crtc->fb->pixel_format) {
> config->mode_changed = true;
> - } else
> + } else if (crtc_connector_off(set->crtc, *set->connectors,
> + set->num_connectors)) {
Bikeshed, crtc_connector_off() sounds like disabling something, while
is_crtc_connector_off() would sound like checking the state.
Jani.
> + config->mode_changed = true;
> + } else {
> config->fb_changed = true;
> + }
> }
>
> if (set->fb && (set->x != set->crtc->x || set->y != set->crtc->y))
> --
> 1.7.10.4
>
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