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drm/i915: document why dvo/sdvo/crt need a special dpms function 

In the cloned case, changing just one output but keeping the other, the
pipe state won't change and intel_crtc_update_dpms will be a nop, but we
still need to update the dpms state of the output being changed.

Only dvo, sdvo and crt are cloneable, so only those three have special
dpms functions.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jani Nikula 2013-05-28 12:35:02 +03:00 committed by Daniel Vetter
parent eccb140bca
commit 6b1c087ba5
3 changed files with 9 additions and 1 deletions
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4
drivers/gpu/drm/i915/intel_crt.c
View File

@ -149,7 +149,7 @@ static void intel_enable_crt(struct intel_encoder *encoder)
intel_crt_set_dpms(encoder, crt->connector->base.dpms);
}
/* Special dpms function to support cloning between dvo/sdvo/crt. */
static void intel_crt_dpms(struct drm_connector *connector, int mode)
{
struct drm_device *dev = connector->dev;
@ -180,6 +180,8 @@ static void intel_crt_dpms(struct drm_connector *connector, int mode)
else
encoder->connectors_active = true;
/* We call connector dpms manually below in case pipe dpms doesn't
* change due to cloning. */
if (mode < old_dpms) {
/* From off to on, enable the pipe first. */
intel_crtc_update_dpms(crtc);

3
drivers/gpu/drm/i915/intel_dvo.c
View File

@ -180,6 +180,7 @@ static void intel_enable_dvo(struct intel_encoder *encoder)
intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
}
/* Special dpms function to support cloning between dvo/sdvo/crt. */
static void intel_dvo_dpms(struct drm_connector *connector, int mode)
{
struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
@ -201,6 +202,8 @@ static void intel_dvo_dpms(struct drm_connector *connector, int mode)
return;
}
/* We call connector dpms manually below in case pipe dpms doesn't
* change due to cloning. */
if (mode == DRM_MODE_DPMS_ON) {
intel_dvo->base.connectors_active = true;

3
drivers/gpu/drm/i915/intel_sdvo.c
View File

@ -1416,6 +1416,7 @@ static void intel_enable_sdvo(struct intel_encoder *encoder)
intel_sdvo_set_active_outputs(intel_sdvo, intel_sdvo->attached_output);
}
/* Special dpms function to support cloning between dvo/sdvo/crt. */
static void intel_sdvo_dpms(struct drm_connector *connector, int mode)
{
struct drm_crtc *crtc;
@ -1437,6 +1438,8 @@ static void intel_sdvo_dpms(struct drm_connector *connector, int mode)
return;
}
/* We set active outputs manually below in case pipe dpms doesn't change
* due to cloning. */
if (mode != DRM_MODE_DPMS_ON) {
intel_sdvo_set_active_outputs(intel_sdvo, 0);
if (0)