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drm/atomic-helpers: Saner encoder/crtc callbacks

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For historical reasons going all the way back to how the Xrandr code
was implemented the semantics of the callbacks used to enable/disable
crtcs and encoders are ... interesting.

But with atomic helpers all that complexity has been binned, with only
a well-defined on/off action left. Unfortunately the names stuck.

Let's fix that by adding enable/disable hooks every, make them the
preferred variant for atomic and update documentations.

Later on we add debug warnings when drivers have deprecated hooks. But
while everything is in-flight with lots of drivers converting to
atomic that's a bit too much - better wait for things to settle a bit
first.

v2: Fix kerneldoc, reported by Wu Fengguang.

Reviewed-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
This commit is contained in:
Daniel Vetter 2015-01-22 16:36:24 +01:00
parent f02ad907cd
commit ee0a89cf3c
2 changed files with 30 additions and 7 deletions
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17
drivers/gpu/drm/drm_atomic_helper.c
View file

@ -599,7 +599,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
encoder->bridge->funcs->disable(encoder->bridge);
/* Right function depends upon target state. */
if (connector->state->crtc)
if (connector->state->crtc && funcs->prepare)
funcs->prepare(encoder);
else if (funcs->disable)
funcs->disable(encoder);
@ -628,7 +628,7 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
funcs = crtc->helper_private;
/* Right function depends upon target state. */
if (crtc->state->enable)
if (crtc->state->enable && funcs->prepare)
funcs->prepare(crtc);
else if (funcs->disable)
funcs->disable(crtc);
@ -792,8 +792,12 @@ void drm_atomic_helper_commit_post_planes(struct drm_device *dev,
funcs = crtc->helper_private;
if (crtc->state->enable)
funcs->commit(crtc);
if (crtc->state->enable) {
if (funcs->enable)
funcs->enable(crtc);
else
funcs->commit(crtc);
}
}
for (i = 0; i < old_state->num_connector; i++) {
@ -819,7 +823,10 @@ void drm_atomic_helper_commit_post_planes(struct drm_device *dev,
if (encoder->bridge)
encoder->bridge->funcs->pre_enable(encoder->bridge);
funcs->commit(encoder);
if (funcs->enable)
funcs->enable(encoder);
else
funcs->commit(encoder);
if (encoder->bridge)
encoder->bridge->funcs->enable(encoder->bridge);

20
include/drm/drm_crtc_helper.h
View file

@ -58,11 +58,19 @@ enum mode_set_atomic {
* @mode_set_base_atomic: non-blocking mode set (used for kgdb support)
* @load_lut: load color palette
* @disable: disable CRTC when no longer in use
* @enable: enable CRTC
* @atomic_check: check for validity of an atomic state
* @atomic_begin: begin atomic update
* @atomic_flush: flush atomic update
*
* The helper operations are called by the mid-layer CRTC helper.
*
* Note that with atomic helpers @dpms, @prepare and @commit hooks are
* deprecated. Used @enable and @disable instead exclusively.
*
* With legacy crtc helpers there's a big semantic difference between @disable
* and the other hooks: @disable also needs to release any resources acquired in
* @mode_set (like shared PLLs).
*/
struct drm_crtc_helper_funcs {
/*
@ -93,8 +101,8 @@ struct drm_crtc_helper_funcs {
/* reload the current crtc LUT */
void (*load_lut)(struct drm_crtc *crtc);
/* disable crtc when not in use - more explicit than dpms off */
void (*disable)(struct drm_crtc *crtc);
void (*enable)(struct drm_crtc *crtc);
/* atomic helpers */
int (*atomic_check)(struct drm_crtc *crtc,
@ -115,8 +123,16 @@ struct drm_crtc_helper_funcs {
* @get_crtc: return CRTC that the encoder is currently attached to
* @detect: connection status detection
* @disable: disable encoder when not in use (overrides DPMS off)
* @enable: enable encoder
*
* The helper operations are called by the mid-layer CRTC helper.
*
* Note that with atomic helpers @dpms, @prepare and @commit hooks are
* deprecated. Used @enable and @disable instead exclusively.
*
* With legacy crtc helpers there's a big semantic difference between @disable
* and the other hooks: @disable also needs to release any resources acquired in
* @mode_set (like shared PLLs).
*/
struct drm_encoder_helper_funcs {
void (*dpms)(struct drm_encoder *encoder, int mode);
@ -135,8 +151,8 @@ struct drm_encoder_helper_funcs {
/* detect for DAC style encoders */
enum drm_connector_status (*detect)(struct drm_encoder *encoder,
struct drm_connector *connector);
/* disable encoder when not in use - more explicit than dpms off */
void (*disable)(struct drm_encoder *encoder);
void (*enable)(struct drm_encoder *encoder);
};
/**