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      1 /*	$NetBSD: amdgpu_dc_dmub_srv.c,v 1.2 2021/12/18 23:45:00 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2019 Advanced Micro Devices, 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: AMD
     25  *
     26  */
     27 
     28 #include <sys/cdefs.h>
     29 __KERNEL_RCSID(0, "$NetBSD: amdgpu_dc_dmub_srv.c,v 1.2 2021/12/18 23:45:00 riastradh Exp $");
     30 
     31 #include "dc.h"
     32 #include "dc_dmub_srv.h"
     33 #include "../dmub/inc/dmub_srv.h"
     34 
     35 static void dc_dmub_srv_construct(struct dc_dmub_srv *dc_srv, struct dc *dc,
     36 				  struct dmub_srv *dmub)
     37 {
     38 	dc_srv->dmub = dmub;
     39 	dc_srv->ctx = dc->ctx;
     40 }
     41 
     42 struct dc_dmub_srv *dc_dmub_srv_create(struct dc *dc, struct dmub_srv *dmub)
     43 {
     44 	struct dc_dmub_srv *dc_srv =
     45 		kzalloc(sizeof(struct dc_dmub_srv), GFP_KERNEL);
     46 
     47 	if (dc_srv == NULL) {
     48 		BREAK_TO_DEBUGGER();
     49 		return NULL;
     50 	}
     51 
     52 	dc_dmub_srv_construct(dc_srv, dc, dmub);
     53 
     54 	return dc_srv;
     55 }
     56 
     57 void dc_dmub_srv_destroy(struct dc_dmub_srv **dmub_srv)
     58 {
     59 	if (*dmub_srv) {
     60 		kfree(*dmub_srv);
     61 		*dmub_srv = NULL;
     62 	}
     63 }
     64 
     65 void dc_dmub_srv_cmd_queue(struct dc_dmub_srv *dc_dmub_srv,
     66 			   struct dmub_cmd_header *cmd)
     67 {
     68 	struct dmub_srv *dmub = dc_dmub_srv->dmub;
     69 	struct dc_context *dc_ctx = dc_dmub_srv->ctx;
     70 	enum dmub_status status;
     71 
     72 	status = dmub_srv_cmd_queue(dmub, cmd);
     73 	if (status == DMUB_STATUS_OK)
     74 		return;
     75 
     76 	if (status != DMUB_STATUS_QUEUE_FULL)
     77 		goto error;
     78 
     79 	/* Execute and wait for queue to become empty again. */
     80 	dc_dmub_srv_cmd_execute(dc_dmub_srv);
     81 	dc_dmub_srv_wait_idle(dc_dmub_srv);
     82 
     83 	/* Requeue the command. */
     84 	status = dmub_srv_cmd_queue(dmub, cmd);
     85 	if (status == DMUB_STATUS_OK)
     86 		return;
     87 
     88 error:
     89 	DC_ERROR("Error queuing DMUB command: status=%d\n", status);
     90 }
     91 
     92 void dc_dmub_srv_cmd_execute(struct dc_dmub_srv *dc_dmub_srv)
     93 {
     94 	struct dmub_srv *dmub = dc_dmub_srv->dmub;
     95 	struct dc_context *dc_ctx = dc_dmub_srv->ctx;
     96 	enum dmub_status status;
     97 
     98 	status = dmub_srv_cmd_execute(dmub);
     99 	if (status != DMUB_STATUS_OK)
    100 		DC_ERROR("Error starting DMUB execution: status=%d\n", status);
    101 }
    102 
    103 void dc_dmub_srv_wait_idle(struct dc_dmub_srv *dc_dmub_srv)
    104 {
    105 	struct dmub_srv *dmub = dc_dmub_srv->dmub;
    106 	struct dc_context *dc_ctx = dc_dmub_srv->ctx;
    107 	enum dmub_status status;
    108 
    109 	status = dmub_srv_wait_for_idle(dmub, 100000);
    110 	if (status != DMUB_STATUS_OK)
    111 		DC_ERROR("Error waiting for DMUB idle: status=%d\n", status);
    112 }
    113 
    114 void dc_dmub_srv_wait_phy_init(struct dc_dmub_srv *dc_dmub_srv)
    115 {
    116 	struct dmub_srv *dmub = dc_dmub_srv->dmub;
    117 	struct dc_context *dc_ctx = dc_dmub_srv->ctx;
    118 	enum dmub_status status;
    119 
    120 	for (;;) {
    121 		/* Wait up to a second for PHY init. */
    122 		status = dmub_srv_wait_for_phy_init(dmub, 1000000);
    123 		if (status == DMUB_STATUS_OK)
    124 			/* Initialization OK */
    125 			break;
    126 
    127 		DC_ERROR("DMCUB PHY init failed: status=%d\n", status);
    128 		ASSERT(0);
    129 
    130 		if (status != DMUB_STATUS_TIMEOUT)
    131 			/*
    132 			 * Server likely initialized or we don't have
    133 			 * DMCUB HW support - this won't end.
    134 			 */
    135 			break;
    136 
    137 		/* Continue spinning so we don't hang the ASIC. */
    138 	}
    139 }
    140