On Tue, Feb 02, 2016 at 01:48:17PM +0100, Maarten Lankhorst wrote:
> drm/i915: Use atomic state to obtain load detection crtc, v2.
>
> Instead of restoring dpms and a flag for whether a temp fb is allocated duplicate
> an atomic state before the new state is committed, and commit it the old state
> in intel_release_load_detect_pipe.
>
> Changes since v1:
> - Use a real atomic state.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
> ---
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 4d8c9f7857db..c7ba8f4a971e 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -10361,6 +10361,7 @@ mode_fits_in_fbdev(struct drm_device *dev,
> if (obj->base.size < mode->vdisplay * fb->pitches[0])
> return NULL;
>
> + drm_framebuffer_reference(fb);
> return fb;
> #else
> return NULL;
> @@ -10416,7 +10417,7 @@ bool intel_get_load_detect_pipe(struct drm_connector *connector,
> struct drm_device *dev = encoder->dev;
> struct drm_framebuffer *fb;
> struct drm_mode_config *config = &dev->mode_config;
> - struct drm_atomic_state *state = NULL;
> + struct drm_atomic_state *state = NULL, *restore_state = NULL;
> struct drm_connector_state *connector_state;
> struct intel_crtc_state *crtc_state;
> int ret, i = -1;
> @@ -10425,6 +10426,8 @@ bool intel_get_load_detect_pipe(struct drm_connector *connector,
> connector->base.id, connector->name,
> encoder->base.id, encoder->name);
>
> + old->restore_state = NULL;
> +
> retry:
> ret = drm_modeset_lock(&config->connection_mutex, ctx);
> if (ret)
> @@ -10441,24 +10444,15 @@ retry:
> */
>
> /* See if we already have a CRTC for this connector */
> - if (encoder->crtc) {
> - crtc = encoder->crtc;
> + if (connector->state->crtc) {
> + crtc = connector->state->crtc;
>
> ret = drm_modeset_lock(&crtc->mutex, ctx);
> if (ret)
> goto fail;
> - ret = drm_modeset_lock(&crtc->primary->mutex, ctx);
> - if (ret)
> - goto fail;
> -
> - old->dpms_mode = connector->dpms;
> - old->load_detect_temp = false;
>
> /* Make sure the crtc and connector are running */
> - if (connector->dpms != DRM_MODE_DPMS_ON)
> - connector->funcs->dpms(connector, DRM_MODE_DPMS_ON);
> -
> - return true;
> + goto found;
> }
>
> /* Find an unused one (if possible) */
> @@ -10466,8 +10460,15 @@ retry:
> i++;
> if (!(encoder->possible_crtcs & (1 << i)))
> continue;
> - if (possible_crtc->state->enable)
> +
> + ret = drm_modeset_lock(&possible_crtc->mutex, ctx);
> + if (ret)
> + goto fail;
> +
> + if (possible_crtc->state->enable) {
> + drm_modeset_unlock(&possible_crtc->mutex);
> continue;
> + }
>
> crtc = possible_crtc;
> break;
> @@ -10481,23 +10482,22 @@ retry:
> goto fail;
> }
>
> - ret = drm_modeset_lock(&crtc->mutex, ctx);
> - if (ret)
> - goto fail;
> +found:
> + intel_crtc = to_intel_crtc(crtc);
> +
> ret = drm_modeset_lock(&crtc->primary->mutex, ctx);
> if (ret)
> goto fail;
>
> - intel_crtc = to_intel_crtc(crtc);
> - old->dpms_mode = connector->dpms;
> - old->load_detect_temp = true;
> - old->release_fb = NULL;
> -
> state = drm_atomic_state_alloc(dev);
> - if (!state)
> - return false;
> + restore_state = drm_atomic_state_alloc(dev);
> + if (!state || !restore_state) {
> + ret = -ENOMEM;
> + goto fail;
> + }
>
> state->acquire_ctx = ctx;
> + restore_state->acquire_ctx = ctx;
>
> connector_state = drm_atomic_get_connector_state(state, connector);
> if (IS_ERR(connector_state)) {
> @@ -10505,7 +10505,9 @@ retry:
> goto fail;
> }
>
> - connector_state->crtc = crtc;
> + ret = drm_atomic_set_crtc_for_connector(connector_state, crtc);
> + if (ret)
> + goto fail;
>
> crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
> if (IS_ERR(crtc_state)) {
> @@ -10529,7 +10531,6 @@ retry:
> if (fb == NULL) {
> DRM_DEBUG_KMS("creating tmp fb for load-detection\n");
> fb = intel_framebuffer_create_for_mode(dev, mode, 24, 32);
> - old->release_fb = fb;
> } else
> DRM_DEBUG_KMS("reusing fbdev for load-detection framebuffer\n");
> if (IS_ERR(fb)) {
> @@ -10541,15 +10542,28 @@ retry:
> if (ret)
> goto fail;
>
> - drm_mode_copy(&crtc_state->base.mode, mode);
> + drm_framebuffer_unreference(fb);
> +
> + ret = drm_atomic_set_mode_for_crtc(&crtc_state->base, mode);
> + if (ret)
> + goto fail;
> +
> + ret = PTR_ERR_OR_ZERO(drm_atomic_get_connector_state(restore_state, connector));
> + if (!ret)
> + ret = PTR_ERR_OR_ZERO(drm_atomic_get_crtc_state(restore_state, crtc));
> + if (!ret)
> + ret = PTR_ERR_OR_ZERO(drm_atomic_get_plane_state(restore_state, crtc->primary));
> + if (ret) {
> + DRM_DEBUG_KMS("Failed to create a copy of old state to restore: %i\n", ret);
> + goto fail;
> + }
>
> if (drm_atomic_commit(state)) {
> DRM_DEBUG_KMS("failed to set mode on load-detect pipe\n");
> - if (old->release_fb)
> - old->release_fb->funcs->destroy(old->release_fb);
> goto fail;
> }
> - crtc->primary->crtc = crtc;
> +
> + old->restore_state = restore_state;
>
> /* let the connector get through one full cycle before testing */
> intel_wait_for_vblank(dev, intel_crtc->pipe);
> @@ -10557,7 +10571,8 @@ retry:
>
> fail:
> drm_atomic_state_free(state);
> - state = NULL;
> + drm_atomic_state_free(restore_state);
> + restore_state = state = NULL;
>
> if (ret == -EDEADLK) {
> drm_modeset_backoff(ctx);
> @@ -10571,14 +10586,12 @@ void intel_release_load_detect_pipe(struct drm_connector *connector,
> struct intel_load_detect_pipe *old,
> struct drm_modeset_acquire_ctx *ctx)
> {
> - struct drm_device *dev = connector->dev;
> struct intel_encoder *intel_encoder =
> intel_attached_encoder(connector);
> struct drm_encoder *encoder = &intel_encoder->base;
> - struct drm_crtc *crtc = encoder->crtc;
> + struct drm_crtc *crtc = connector->state->crtc;
> struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> - struct drm_atomic_state *state;
> - struct drm_connector_state *connector_state;
> + struct drm_atomic_state *state = old->restore_state;
> struct intel_crtc_state *crtc_state;
> int ret;
>
> @@ -10586,50 +10599,17 @@ void intel_release_load_detect_pipe(struct drm_connector *connector,
> connector->base.id, connector->name,
> encoder->base.id, encoder->name);
>
> - if (old->load_detect_temp) {
> - state = drm_atomic_state_alloc(dev);
> - if (!state)
> - goto fail;
> -
> - state->acquire_ctx = ctx;
> -
> - connector_state = drm_atomic_get_connector_state(state, connector);
> - if (IS_ERR(connector_state))
> - goto fail;
> -
> - crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
> - if (IS_ERR(crtc_state))
> - goto fail;
> -
> - connector_state->crtc = NULL;
> -
> - crtc_state->base.enable = crtc_state->base.active = false;
> -
> - ret = intel_modeset_setup_plane_state(state, crtc, NULL, NULL,
> - 0, 0);
> - if (ret)
> - goto fail;
> -
> - ret = drm_atomic_commit(state);
> - if (ret)
> - goto fail;
> -
> - if (old->release_fb) {
> - drm_framebuffer_unregister_private(old->release_fb);
> - drm_framebuffer_unreference(old->release_fb);
> - }
> -
> + if (!state)
> return;
> - }
>
> - /* Switch crtc and encoder back off if necessary */
> - if (old->dpms_mode != DRM_MODE_DPMS_ON)
> - connector->funcs->dpms(connector, old->dpms_mode);
> + crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
> + crtc_state->shared_dpll = to_intel_crtc_state(crtc->state)->shared_dpll;
Hmm. What's this shared_dpll stuff?
>
> - return;
> -fail:
> - DRM_DEBUG_KMS("Couldn't release load detect pipe.\n");
> - drm_atomic_state_free(state);
> + ret = drm_atomic_commit(state);
> + if (ret) {
> + DRM_DEBUG_KMS("Couldn't release load detect pipe: %i\n", ret);
> + drm_atomic_state_free(state);
> + }
> }
>
> static int i9xx_pll_refclk(struct drm_device *dev,
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 93ba14a3bb76..7d10ca7797a9 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -912,9 +912,7 @@ struct intel_unpin_work {
> };
>
> struct intel_load_detect_pipe {
> - struct drm_framebuffer *release_fb;
> - bool load_detect_temp;
> - int dpms_mode;
> + struct drm_atomic_state *restore_state;
> };
>
> static inline struct intel_encoder *
--
Ville Syrjälä
Intel OTC
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