From d03c93d4801563de43abf91e56ff4b3fbc8cc7e4 Mon Sep 17 00:00:00 2001 From: Chandra Konduru Date: Thu, 9 Apr 2015 16:42:46 -0700 Subject: [PATCH] drm/i915: setup scalers for crtc_compute_config Added intel_atomic_setup_scalers to setup scalers based on staged scaling requests from a crtc and its planes. If staged requests are supportable, this function assigns scalers to requested planes and crtc. Note that the scaler assignement itself is staged into crtc_state and respective plane_states for later commit after all checks have been done. overall high level flow: - scaler requests are staged into crtc_state by planes/crtc - check whether staged scaling requests can be supported - add planes using scalers that aren't in current transaction - assign scalers to requested users - as part of plane commit, scalers will be committed (i.e., either attached or detached) to respective planes in hw - as part of crtc_commit, scaler will be either attached or detached to crtc in hw crtc_compute_config calls intel_atomic_setup_scalers() to start scaler assignments as per scaler state in crtc config. This call should be moved to atomic crtc once it is available. v2: -removed a log message (me) -changed input parameter to crtc_state (me) v3: -remove assigning plane_state returned by drm_atomic_get_plane_state (Matt) -fail if there is an error from drm_atomic_get_plane_state (Matt) v4: -changes to align with updated scaler structure (Matt, me) v5: -added addtional checks before enabling HQ mode (me) -added comments to enable HQ mode (Matt) Signed-off-by: Chandra Konduru Reviewed-by: Matt Roper Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_atomic.c | 148 +++++++++++++++++++++++++++ drivers/gpu/drm/i915/intel_display.c | 10 +- drivers/gpu/drm/i915/intel_drv.h | 3 + 3 files changed, 160 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_atomic.c b/drivers/gpu/drm/i915/intel_atomic.c index b4ea6762e4ef..c5e4b6c30643 100644 --- a/drivers/gpu/drm/i915/intel_atomic.c +++ b/drivers/gpu/drm/i915/intel_atomic.c @@ -243,3 +243,151 @@ intel_crtc_destroy_state(struct drm_crtc *crtc, { drm_atomic_helper_crtc_destroy_state(crtc, state); } + +/** + * intel_atomic_setup_scalers() - setup scalers for crtc per staged requests + * @dev: DRM device + * @crtc: intel crtc + * @crtc_state: incoming crtc_state to validate and setup scalers + * + * This function sets up scalers based on staged scaling requests for + * a @crtc and its planes. It is called from crtc level check path. If request + * is a supportable request, it attaches scalers to requested planes and crtc. + * + * This function takes into account the current scaler(s) in use by any planes + * not being part of this atomic state + * + * Returns: + * 0 - scalers were setup succesfully + * error code - otherwise + */ +int intel_atomic_setup_scalers(struct drm_device *dev, + struct intel_crtc *intel_crtc, + struct intel_crtc_state *crtc_state) +{ + struct drm_plane *plane = NULL; + struct intel_plane *intel_plane; + struct intel_plane_state *plane_state = NULL; + struct intel_crtc_scaler_state *scaler_state; + struct drm_atomic_state *drm_state; + int num_scalers_need; + int i, j; + + if (INTEL_INFO(dev)->gen < 9 || !intel_crtc || !crtc_state) + return 0; + + scaler_state = &crtc_state->scaler_state; + drm_state = crtc_state->base.state; + + num_scalers_need = hweight32(scaler_state->scaler_users); + DRM_DEBUG_KMS("crtc_state = %p need = %d avail = %d scaler_users = 0x%x\n", + crtc_state, num_scalers_need, intel_crtc->num_scalers, + scaler_state->scaler_users); + + /* + * High level flow: + * - staged scaler requests are already in scaler_state->scaler_users + * - check whether staged scaling requests can be supported + * - add planes using scalers that aren't in current transaction + * - assign scalers to requested users + * - as part of plane commit, scalers will be committed + * (i.e., either attached or detached) to respective planes in hw + * - as part of crtc_commit, scaler will be either attached or detached + * to crtc in hw + */ + + /* fail if required scalers > available scalers */ + if (num_scalers_need > intel_crtc->num_scalers){ + DRM_DEBUG_KMS("Too many scaling requests %d > %d\n", + num_scalers_need, intel_crtc->num_scalers); + return -EINVAL; + } + + /* walkthrough scaler_users bits and start assigning scalers */ + for (i = 0; i < sizeof(scaler_state->scaler_users) * 8; i++) { + int *scaler_id; + + /* skip if scaler not required */ + if (!(scaler_state->scaler_users & (1 << i))) + continue; + + if (i == SKL_CRTC_INDEX) { + /* panel fitter case: assign as a crtc scaler */ + scaler_id = &scaler_state->scaler_id; + } else { + if (!drm_state) + continue; + + /* plane scaler case: assign as a plane scaler */ + /* find the plane that set the bit as scaler_user */ + plane = drm_state->planes[i]; + + /* + * to enable/disable hq mode, add planes that are using scaler + * into this transaction + */ + if (!plane) { + struct drm_plane_state *state; + plane = drm_plane_from_index(dev, i); + state = drm_atomic_get_plane_state(drm_state, plane); + if (IS_ERR(state)) { + DRM_DEBUG_KMS("Failed to add [PLANE:%d] to drm_state\n", + plane->base.id); + return PTR_ERR(state); + } + } + + intel_plane = to_intel_plane(plane); + + /* plane on different crtc cannot be a scaler user of this crtc */ + if (WARN_ON(intel_plane->pipe != intel_crtc->pipe)) { + continue; + } + + plane_state = to_intel_plane_state(drm_state->plane_states[i]); + scaler_id = &plane_state->scaler_id; + } + + if (*scaler_id < 0) { + /* find a free scaler */ + for (j = 0; j < intel_crtc->num_scalers; j++) { + if (!scaler_state->scalers[j].in_use) { + scaler_state->scalers[j].in_use = 1; + *scaler_id = scaler_state->scalers[j].id; + DRM_DEBUG_KMS("Attached scaler id %u.%u to %s:%d\n", + intel_crtc->pipe, + i == SKL_CRTC_INDEX ? scaler_state->scaler_id : + plane_state->scaler_id, + i == SKL_CRTC_INDEX ? "CRTC" : "PLANE", + i == SKL_CRTC_INDEX ? intel_crtc->base.base.id : + plane->base.id); + break; + } + } + } + + if (WARN_ON(*scaler_id < 0)) { + DRM_DEBUG_KMS("Cannot find scaler for %s:%d\n", + i == SKL_CRTC_INDEX ? "CRTC" : "PLANE", + i == SKL_CRTC_INDEX ? intel_crtc->base.base.id:plane->base.id); + continue; + } + + /* set scaler mode */ + if (num_scalers_need == 1 && intel_crtc->pipe != PIPE_C) { + /* + * when only 1 scaler is in use on either pipe A or B, + * scaler 0 operates in high quality (HQ) mode. + * In this case use scaler 0 to take advantage of HQ mode + */ + *scaler_id = 0; + scaler_state->scalers[0].in_use = 1; + scaler_state->scalers[0].mode = PS_SCALER_MODE_HQ; + scaler_state->scalers[1].in_use = 0; + } else { + scaler_state->scalers[*scaler_id].mode = PS_SCALER_MODE_DYN; + } + } + + return 0; +} diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index c14ab7b2f831..48129fa9360d 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -5886,6 +5886,7 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc, struct drm_device *dev = crtc->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode; + int ret; /* FIXME should check pixel clock limits on all platforms */ if (INTEL_INFO(dev)->gen < 4) { @@ -5940,7 +5941,14 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc, if (pipe_config->has_pch_encoder) return ironlake_fdi_compute_config(crtc, pipe_config); - return 0; + /* FIXME: remove below call once atomic mode set is place and all crtc + * related checks called from atomic_crtc_check function */ + ret = 0; + DRM_DEBUG_KMS("intel_crtc = %p drm_state (pipe_config->base.state) = %p\n", + crtc, pipe_config->base.state); + ret = intel_atomic_setup_scalers(dev, crtc, pipe_config); + + return ret; } static int skylake_get_display_clock_speed(struct drm_device *dev) diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 40112751ca6e..885e48295778 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -1392,6 +1392,9 @@ intel_atomic_get_crtc_state(struct drm_atomic_state *state, return to_intel_crtc_state(crtc_state); } +int intel_atomic_setup_scalers(struct drm_device *dev, + struct intel_crtc *intel_crtc, + struct intel_crtc_state *crtc_state); /* intel_atomic_plane.c */ struct intel_plane_state *intel_create_plane_state(struct drm_plane *plane); -- GitLab