drivers/gpu/drm/msm/mdp/mdp4/mdp4_lvds_connector.c

   1 /*
   2  * Copyright (C) 2014 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  * Author: Vinay Simha <vinaysimha@inforcecomputing.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published by
   8  * the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <linux/gpio.h>
  20
  21 #include "mdp4_kms.h"
  22
  23 struct mdp4_lvds_connector {
  24         struct drm_connector base;
  25         struct drm_encoder *encoder;
  26         struct device_node *panel_node;
  27         struct drm_panel *panel;
  28 };
  29 #define to_mdp4_lvds_connector(x) container_of(x, struct mdp4_lvds_connector, base)
  30
  31 static enum drm_connector_status mdp4_lvds_connector_detect(
  32                 struct drm_connector *connector, bool force)
  33 {
  34         struct mdp4_lvds_connector *mdp4_lvds_connector =
  35                         to_mdp4_lvds_connector(connector);
  36
  37         if (!mdp4_lvds_connector->panel)
  38                 mdp4_lvds_connector->panel =
  39                         of_drm_find_panel(mdp4_lvds_connector->panel_node);
  40
  41         return mdp4_lvds_connector->panel ?
  42                         connector_status_connected :
  43                         connector_status_disconnected;
  44 }
  45
  46 static void mdp4_lvds_connector_destroy(struct drm_connector *connector)
  47 {
  48         struct mdp4_lvds_connector *mdp4_lvds_connector =
  49                         to_mdp4_lvds_connector(connector);
  50
  51         drm_connector_cleanup(connector);
  52
  53         kfree(mdp4_lvds_connector);
  54 }
  55
  56 static int mdp4_lvds_connector_get_modes(struct drm_connector *connector)
  57 {
  58         struct mdp4_lvds_connector *mdp4_lvds_connector =
  59                         to_mdp4_lvds_connector(connector);
  60         struct drm_panel *panel = mdp4_lvds_connector->panel;
  61         int ret = 0;
  62
  63         if (panel) {
  64                 drm_panel_attach(panel, connector);
  65
  66                 ret = panel->funcs->get_modes(panel);
  67
  68                 drm_panel_detach(panel);
  69         }
  70
  71         return ret;
  72 }
  73
  74 static int mdp4_lvds_connector_mode_valid(struct drm_connector *connector,
  75                                  struct drm_display_mode *mode)
  76 {
  77         struct mdp4_lvds_connector *mdp4_lvds_connector =
  78                         to_mdp4_lvds_connector(connector);
  79         struct drm_encoder *encoder = mdp4_lvds_connector->encoder;
  80         long actual, requested;
  81
  82         requested = 1000 * mode->clock;
  83         actual = mdp4_lcdc_round_pixclk(encoder, requested);
  84
  85         DBG("requested=%ld, actual=%ld", requested, actual);
  86
  87         if (actual != requested)
  88                 return MODE_CLOCK_RANGE;
  89
  90         return MODE_OK;
  91 }
  92
  93 static struct drm_encoder *
  94 mdp4_lvds_connector_best_encoder(struct drm_connector *connector)
  95 {
  96         struct mdp4_lvds_connector *mdp4_lvds_connector =
  97                         to_mdp4_lvds_connector(connector);
  98         return mdp4_lvds_connector->encoder;
  99 }
 100
 101 static const struct drm_connector_funcs mdp4_lvds_connector_funcs = {
 102         .dpms = drm_atomic_helper_connector_dpms,
 103         .detect = mdp4_lvds_connector_detect,
 104         .fill_modes = drm_helper_probe_single_connector_modes,
 105         .destroy = mdp4_lvds_connector_destroy,
 106         .reset = drm_atomic_helper_connector_reset,
 107         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 108         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 109 };
 110
 111 static const struct drm_connector_helper_funcs mdp4_lvds_connector_helper_funcs = {
 112         .get_modes = mdp4_lvds_connector_get_modes,
 113         .mode_valid = mdp4_lvds_connector_mode_valid,
 114         .best_encoder = mdp4_lvds_connector_best_encoder,
 115 };
 116
 117 /* initialize connector */
 118 struct drm_connector *mdp4_lvds_connector_init(struct drm_device *dev,
 119                 struct device_node *panel_node, struct drm_encoder *encoder)
 120 {
 121         struct drm_connector *connector = NULL;
 122         struct mdp4_lvds_connector *mdp4_lvds_connector;
 123
 124         mdp4_lvds_connector = kzalloc(sizeof(*mdp4_lvds_connector), GFP_KERNEL);
 125         if (!mdp4_lvds_connector)
 126                 return ERR_PTR(-ENOMEM);
 127
 128         mdp4_lvds_connector->encoder = encoder;
 129         mdp4_lvds_connector->panel_node = panel_node;
 130
 131         connector = &mdp4_lvds_connector->base;
 132
 133         drm_connector_init(dev, connector, &mdp4_lvds_connector_funcs,
 134                         DRM_MODE_CONNECTOR_LVDS);
 135         drm_connector_helper_add(connector, &mdp4_lvds_connector_helper_funcs);
 136
 137         connector->polled = 0;
 138
 139         connector->interlace_allowed = 0;
 140         connector->doublescan_allowed = 0;
 141
 142         drm_mode_connector_attach_encoder(connector, encoder);
 143
 144         return connector;
 145 }