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      1 /*	$NetBSD: nouveau_nvkm_engine_disp_head.c,v 1.2 2021/12/18 23:45:35 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2017 Red Hat Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  * Authors: Ben Skeggs <bskeggs (at) redhat.com>
     25  */
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_engine_disp_head.c,v 1.2 2021/12/18 23:45:35 riastradh Exp $");
     28 
     29 #include "head.h"
     30 
     31 #include <core/client.h>
     32 
     33 #include <nvif/cl0046.h>
     34 #include <nvif/unpack.h>
     35 
     36 struct nvkm_head *
     37 nvkm_head_find(struct nvkm_disp *disp, int id)
     38 {
     39 	struct nvkm_head *head;
     40 	list_for_each_entry(head, &disp->head, head) {
     41 		if (head->id == id)
     42 			return head;
     43 	}
     44 	return NULL;
     45 }
     46 
     47 int
     48 nvkm_head_mthd_scanoutpos(struct nvkm_object *object,
     49 			  struct nvkm_head *head, void *data, u32 size)
     50 {
     51 	union {
     52 		struct nv04_disp_scanoutpos_v0 v0;
     53 	} *args = data;
     54 	int ret = -ENOSYS;
     55 
     56 	nvif_ioctl(object, "head scanoutpos size %d\n", size);
     57 	if (!(ret = nvif_unpack(ret, &data, &size, args->v0, 0, 0, false))) {
     58 		nvif_ioctl(object, "head scanoutpos vers %d\n",
     59 			   args->v0.version);
     60 
     61 		head->func->state(head, &head->arm);
     62 		args->v0.vtotal  = head->arm.vtotal;
     63 		args->v0.vblanks = head->arm.vblanks;
     64 		args->v0.vblanke = head->arm.vblanke;
     65 		args->v0.htotal  = head->arm.htotal;
     66 		args->v0.hblanks = head->arm.hblanks;
     67 		args->v0.hblanke = head->arm.hblanke;
     68 
     69 		/* We don't support reading htotal/vtotal on pre-NV50 VGA,
     70 		 * so we have to give up and trigger the timestamping
     71 		 * fallback in the drm core.
     72 		 */
     73 		if (!args->v0.vtotal || !args->v0.htotal)
     74 			return -ENOTSUPP;
     75 
     76 		args->v0.time[0] = ktime_to_ns(ktime_get());
     77 		head->func->rgpos(head, &args->v0.hline, &args->v0.vline);
     78 		args->v0.time[1] = ktime_to_ns(ktime_get());
     79 	} else
     80 		return ret;
     81 
     82 	return 0;
     83 }
     84 
     85 void
     86 nvkm_head_del(struct nvkm_head **phead)
     87 {
     88 	struct nvkm_head *head = *phead;
     89 	if (head) {
     90 		HEAD_DBG(head, "dtor");
     91 		list_del(&head->head);
     92 		kfree(*phead);
     93 		*phead = NULL;
     94 	}
     95 }
     96 
     97 int
     98 nvkm_head_new_(const struct nvkm_head_func *func,
     99 	       struct nvkm_disp *disp, int id)
    100 {
    101 	struct nvkm_head *head;
    102 	if (!(head = kzalloc(sizeof(*head), GFP_KERNEL)))
    103 		return -ENOMEM;
    104 	head->func = func;
    105 	head->disp = disp;
    106 	head->id = id;
    107 	list_add_tail(&head->head, &disp->head);
    108 	HEAD_DBG(head, "ctor");
    109 	return 0;
    110 }
    111