drivers/gpu/drm/i915/intel_atomic.c

   1 /*
   2  * Copyright © 2015 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * DOC: atomic modeset support
  26  *
  27  * The functions here implement the state management and hardware programming
  28  * dispatch required by the atomic modeset infrastructure.
  29  * See intel_atomic_plane.c for the plane-specific atomic functionality.
  30  */
  31
  32 #include <drm/drmP.h>
  33 #include <drm/drm_atomic.h>
  34 #include <drm/drm_atomic_helper.h>
  35 #include <drm/drm_plane_helper.h>
  36 #include "intel_drv.h"
  37
  38 /**
  39  * intel_connector_atomic_get_property - fetch connector property value
  40  * @connector: connector to fetch property for
  41  * @state: state containing the property value
  42  * @property: property to look up
  43  * @val: pointer to write property value into
  44  *
  45  * The DRM core does not store shadow copies of properties for
  46  * atomic-capable drivers.  This entrypoint is used to fetch
  47  * the current value of a driver-specific connector property.
  48  */
  49 int
  50 intel_connector_atomic_get_property(struct drm_connector *connector,
  51                                     const struct drm_connector_state *state,
  52                                     struct drm_property *property,
  53                                     uint64_t *val)
  54 {
  55         int i;
  56
  57         /*
  58          * TODO: We only have atomic modeset for planes at the moment, so the
  59          * crtc/connector code isn't quite ready yet.  Until it's ready,
  60          * continue to look up all property values in the DRM's shadow copy
  61          * in obj->properties->values[].
  62          *
  63          * When the crtc/connector state work matures, this function should
  64          * be updated to read the values out of the state structure instead.
  65          */
  66         for (i = 0; i < connector->base.properties->count; i++) {
  67                 if (connector->base.properties->properties[i] == property) {
  68                         *val = connector->base.properties->values[i];
  69                         return 0;
  70                 }
  71         }
  72
  73         return -EINVAL;
  74 }
  75
  76 /*
  77  * intel_crtc_duplicate_state - duplicate crtc state
  78  * @crtc: drm crtc
  79  *
  80  * Allocates and returns a copy of the crtc state (both common and
  81  * Intel-specific) for the specified crtc.
  82  *
  83  * Returns: The newly allocated crtc state, or NULL on failure.
  84  */
  85 struct drm_crtc_state *
  86 intel_crtc_duplicate_state(struct drm_crtc *crtc)
  87 {
  88         struct intel_crtc_state *crtc_state;
  89
  90         crtc_state = kmemdup(crtc->state, sizeof(*crtc_state), GFP_KERNEL);
  91         if (!crtc_state)
  92                 return NULL;
  93
  94         __drm_atomic_helper_crtc_duplicate_state(crtc, &crtc_state->base);
  95
  96         crtc_state->update_pipe = false;
  97         crtc_state->disable_lp_wm = false;
  98         crtc_state->disable_cxsr = false;
  99         crtc_state->update_wm_pre = false;
 100         crtc_state->update_wm_post = false;
 101         crtc_state->fb_changed = false;
 102         crtc_state->wm.need_postvbl_update = false;
 103         crtc_state->fb_bits = 0;
 104
 105         return &crtc_state->base;
 106 }
 107
 108 /**
 109  * intel_crtc_destroy_state - destroy crtc state
 110  * @crtc: drm crtc
 111  *
 112  * Destroys the crtc state (both common and Intel-specific) for the
 113  * specified crtc.
 114  */
 115 void
 116 intel_crtc_destroy_state(struct drm_crtc *crtc,
 117                           struct drm_crtc_state *state)
 118 {
 119         drm_atomic_helper_crtc_destroy_state(crtc, state);
 120 }
 121
 122 /**
 123  * intel_atomic_setup_scalers() - setup scalers for crtc per staged requests
 124  * @dev: DRM device
 125  * @crtc: intel crtc
 126  * @crtc_state: incoming crtc_state to validate and setup scalers
 127  *
 128  * This function sets up scalers based on staged scaling requests for
 129  * a @crtc and its planes. It is called from crtc level check path. If request
 130  * is a supportable request, it attaches scalers to requested planes and crtc.
 131  *
 132  * This function takes into account the current scaler(s) in use by any planes
 133  * not being part of this atomic state
 134  *
 135  *  Returns:
 136  *         0 - scalers were setup succesfully
 137  *         error code - otherwise
 138  */
 139 int intel_atomic_setup_scalers(struct drm_device *dev,
 140         struct intel_crtc *intel_crtc,
 141         struct intel_crtc_state *crtc_state)
 142 {
 143         struct drm_plane *plane = NULL;
 144         struct intel_plane *intel_plane;
 145         struct intel_plane_state *plane_state = NULL;
 146         struct intel_crtc_scaler_state *scaler_state =
 147                 &crtc_state->scaler_state;
 148         struct drm_atomic_state *drm_state = crtc_state->base.state;
 149         int num_scalers_need;
 150         int i, j;
 151
 152         num_scalers_need = hweight32(scaler_state->scaler_users);
 153
 154         /*
 155          * High level flow:
 156          * - staged scaler requests are already in scaler_state->scaler_users
 157          * - check whether staged scaling requests can be supported
 158          * - add planes using scalers that aren't in current transaction
 159          * - assign scalers to requested users
 160          * - as part of plane commit, scalers will be committed
 161          *   (i.e., either attached or detached) to respective planes in hw
 162          * - as part of crtc_commit, scaler will be either attached or detached
 163          *   to crtc in hw
 164          */
 165
 166         /* fail if required scalers > available scalers */
 167         if (num_scalers_need > intel_crtc->num_scalers){
 168                 DRM_DEBUG_KMS("Too many scaling requests %d > %d\n",
 169                         num_scalers_need, intel_crtc->num_scalers);
 170                 return -EINVAL;
 171         }
 172
 173         /* walkthrough scaler_users bits and start assigning scalers */
 174         for (i = 0; i < sizeof(scaler_state->scaler_users) * 8; i++) {
 175                 int *scaler_id;
 176                 const char *name;
 177                 int idx;
 178
 179                 /* skip if scaler not required */
 180                 if (!(scaler_state->scaler_users & (1 << i)))
 181                         continue;
 182
 183                 if (i == SKL_CRTC_INDEX) {
 184                         name = "CRTC";
 185                         idx = intel_crtc->base.base.id;
 186
 187                         /* panel fitter case: assign as a crtc scaler */
 188                         scaler_id = &scaler_state->scaler_id;
 189                 } else {
 190                         name = "PLANE";
 191
 192                         /* plane scaler case: assign as a plane scaler */
 193                         /* find the plane that set the bit as scaler_user */
 194                         plane = drm_state->planes[i].ptr;
 195
 196                         /*
 197                          * to enable/disable hq mode, add planes that are using scaler
 198                          * into this transaction
 199                          */
 200                         if (!plane) {
 201                                 struct drm_plane_state *state;
 202                                 plane = drm_plane_from_index(dev, i);
 203                                 state = drm_atomic_get_plane_state(drm_state, plane);
 204                                 if (IS_ERR(state)) {
 205                                         DRM_DEBUG_KMS("Failed to add [PLANE:%d] to drm_state\n",
 206                                                 plane->base.id);
 207                                         return PTR_ERR(state);
 208                                 }
 209
 210                                 /*
 211                                  * the plane is added after plane checks are run,
 212                                  * but since this plane is unchanged just do the
 213                                  * minimum required validation.
 214                                  */
 215                                 crtc_state->base.planes_changed = true;
 216                         }
 217
 218                         intel_plane = to_intel_plane(plane);
 219                         idx = plane->base.id;
 220
 221                         /* plane on different crtc cannot be a scaler user of this crtc */
 222                         if (WARN_ON(intel_plane->pipe != intel_crtc->pipe)) {
 223                                 continue;
 224                         }
 225
 226                         plane_state = intel_atomic_get_existing_plane_state(drm_state,
 227                                                                             intel_plane);
 228                         scaler_id = &plane_state->scaler_id;
 229                 }
 230
 231                 if (*scaler_id < 0) {
 232                         /* find a free scaler */
 233                         for (j = 0; j < intel_crtc->num_scalers; j++) {
 234                                 if (!scaler_state->scalers[j].in_use) {
 235                                         scaler_state->scalers[j].in_use = 1;
 236                                         *scaler_id = j;
 237                                         DRM_DEBUG_KMS("Attached scaler id %u.%u to %s:%d\n",
 238                                                 intel_crtc->pipe, *scaler_id, name, idx);
 239                                         break;
 240                                 }
 241                         }
 242                 }
 243
 244                 if (WARN_ON(*scaler_id < 0)) {
 245                         DRM_DEBUG_KMS("Cannot find scaler for %s:%d\n", name, idx);
 246                         continue;
 247                 }
 248
 249                 /* set scaler mode */
 250                 if (num_scalers_need == 1 && intel_crtc->pipe != PIPE_C) {
 251                         /*
 252                          * when only 1 scaler is in use on either pipe A or B,
 253                          * scaler 0 operates in high quality (HQ) mode.
 254                          * In this case use scaler 0 to take advantage of HQ mode
 255                          */
 256                         *scaler_id = 0;
 257                         scaler_state->scalers[0].in_use = 1;
 258                         scaler_state->scalers[0].mode = PS_SCALER_MODE_HQ;
 259                         scaler_state->scalers[1].in_use = 0;
 260                 } else {
 261                         scaler_state->scalers[*scaler_id].mode = PS_SCALER_MODE_DYN;
 262                 }
 263         }
 264
 265         return 0;
 266 }
 267
 268 struct drm_atomic_state *
 269 intel_atomic_state_alloc(struct drm_device *dev)
 270 {
 271         struct intel_atomic_state *state = kzalloc(sizeof(*state), GFP_KERNEL);
 272
 273         if (!state || drm_atomic_state_init(dev, &state->base) < 0) {
 274                 kfree(state);
 275                 return NULL;
 276         }
 277
 278         return &state->base;
 279 }
 280
 281 void intel_atomic_state_clear(struct drm_atomic_state *s)
 282 {
 283         struct intel_atomic_state *state = to_intel_atomic_state(s);
 284         drm_atomic_state_default_clear(&state->base);
 285         state->dpll_set = state->modeset = false;
 286 }