LXR linux/drivers/gpu/drm/nouveau/nvkm/engine/disp/head.c

   1/*
   2 * Copyright 2017 Red Hat Inc.
   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 shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 *
  22 * Authors: Ben Skeggs <bskeggs@redhat.com>
  23 */
  24#include "head.h"
  25
  26#include <core/client.h>
  27
  28#include <nvif/cl0046.h>
  29#include <nvif/unpack.h>
  30
  31struct nvkm_head *
  32nvkm_head_find(struct nvkm_disp *disp, int id)
  33{
  34        struct nvkm_head *head;
  35        list_for_each_entry(head, &disp->head, head) {
  36                if (head->id == id)
  37                        return head;
  38        }
  39        return NULL;
  40}
  41
  42int
  43nvkm_head_mthd_scanoutpos(struct nvkm_object *object,
  44                          struct nvkm_head *head, void *data, u32 size)
  45{
  46        union {
  47                struct nv04_disp_scanoutpos_v0 v0;
  48        } *args = data;
  49        int ret = -ENOSYS;
  50
  51        nvif_ioctl(object, "head scanoutpos size %d\n", size);
  52        if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
  53                nvif_ioctl(object, "head scanoutpos vers %d\n",
  54                           args->v0.version);
  55
  56                head->func->state(head, &head->arm);
  57                args->v0.vtotal  = head->arm.vtotal;
  58                args->v0.vblanks = head->arm.vblanks;
  59                args->v0.vblanke = head->arm.vblanke;
  60                args->v0.htotal  = head->arm.htotal;
  61                args->v0.hblanks = head->arm.hblanks;
  62                args->v0.hblanke = head->arm.hblanke;
  63
  64                /* We don't support reading htotal/vtotal on pre-NV50 VGA,
  65                 * so we have to give up and trigger the timestamping
  66                 * fallback in the drm core.
  67                 */
  68                if (!args->v0.vtotal || !args->v0.htotal)
  69                        return -ENOTSUPP;
  70
  71                args->v0.time[0] = ktime_to_ns(ktime_get());
  72                head->func->rgpos(head, &args->v0.hline, &args->v0.vline);
  73                args->v0.time[1] = ktime_to_ns(ktime_get());
  74        } else
  75                return ret;
  76
  77        return 0;
  78}
  79
  80void
  81nvkm_head_del(struct nvkm_head **phead)
  82{
  83        struct nvkm_head *head = *phead;
  84        if (head) {
  85                HEAD_DBG(head, "dtor");
  86                list_del(&head->head);
  87                kfree(*phead);
  88                *phead = NULL;
  89        }
  90}
  91
  92int
  93nvkm_head_new_(const struct nvkm_head_func *func,
  94               struct nvkm_disp *disp, int id)
  95{
  96        struct nvkm_head *head;
  97        if (!(head = kzalloc(sizeof(*head), GFP_KERNEL)))
  98                return -ENOMEM;
  99        head->func = func;
 100        head->disp = disp;
 101        head->id = id;
 102        list_add_tail(&head->head, &disp->head);
 103        HEAD_DBG(head, "ctor");
 104        return 0;
 105}
 106