drivers/gpu/drm/msm/disp/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                 if (IS_ERR(mdp4_lvds_connector->panel))
  41                         mdp4_lvds_connector->panel = NULL;
  42         }
  43
  44         return mdp4_lvds_connector->panel ?
  45                         connector_status_connected :
  46                         connector_status_disconnected;
  47 }
  48
  49 static void mdp4_lvds_connector_destroy(struct drm_connector *connector)
  50 {
  51         struct mdp4_lvds_connector *mdp4_lvds_connector =
  52                         to_mdp4_lvds_connector(connector);
  53
  54         drm_connector_cleanup(connector);
  55
  56         kfree(mdp4_lvds_connector);
  57 }
  58
  59 static int mdp4_lvds_connector_get_modes(struct drm_connector *connector)
  60 {
  61         struct mdp4_lvds_connector *mdp4_lvds_connector =
  62                         to_mdp4_lvds_connector(connector);
  63         struct drm_panel *panel = mdp4_lvds_connector->panel;
  64         int ret = 0;
  65
  66         if (panel) {
  67                 drm_panel_attach(panel, connector);
  68
  69                 ret = panel->funcs->get_modes(panel);
  70
  71                 drm_panel_detach(panel);
  72         }
  73
  74         return ret;
  75 }
  76
  77 static enum drm_mode_status
  78 mdp4_lvds_connector_mode_valid(struct drm_connector *connector,
  79                                struct drm_display_mode *mode)
  80 {
  81         struct mdp4_lvds_connector *mdp4_lvds_connector =
  82                         to_mdp4_lvds_connector(connector);
  83         struct drm_encoder *encoder = mdp4_lvds_connector->encoder;
  84         long actual, requested;
  85
  86         requested = 1000 * mode->clock;
  87         actual = mdp4_lcdc_round_pixclk(encoder, requested);
  88
  89         DBG("requested=%ld, actual=%ld", requested, actual);
  90
  91         if (actual != requested)
  92                 return MODE_CLOCK_RANGE;
  93
  94         return MODE_OK;
  95 }
  96
  97 static const struct drm_connector_funcs mdp4_lvds_connector_funcs = {
  98         .detect = mdp4_lvds_connector_detect,
  99         .fill_modes = drm_helper_probe_single_connector_modes,
 100         .destroy = mdp4_lvds_connector_destroy,
 101         .reset = drm_atomic_helper_connector_reset,
 102         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 103         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 104 };
 105
 106 static const struct drm_connector_helper_funcs mdp4_lvds_connector_helper_funcs = {
 107         .get_modes = mdp4_lvds_connector_get_modes,
 108         .mode_valid = mdp4_lvds_connector_mode_valid,
 109 };
 110
 111 /* initialize connector */
 112 struct drm_connector *mdp4_lvds_connector_init(struct drm_device *dev,
 113                 struct device_node *panel_node, struct drm_encoder *encoder)
 114 {
 115         struct drm_connector *connector = NULL;
 116         struct mdp4_lvds_connector *mdp4_lvds_connector;
 117
 118         mdp4_lvds_connector = kzalloc(sizeof(*mdp4_lvds_connector), GFP_KERNEL);
 119         if (!mdp4_lvds_connector)
 120                 return ERR_PTR(-ENOMEM);
 121
 122         mdp4_lvds_connector->encoder = encoder;
 123         mdp4_lvds_connector->panel_node = panel_node;
 124
 125         connector = &mdp4_lvds_connector->base;
 126
 127         drm_connector_init(dev, connector, &mdp4_lvds_connector_funcs,
 128                         DRM_MODE_CONNECTOR_LVDS);
 129         drm_connector_helper_add(connector, &mdp4_lvds_connector_helper_funcs);
 130
 131         connector->polled = 0;
 132
 133         connector->interlace_allowed = 0;
 134         connector->doublescan_allowed = 0;
 135
 136         drm_connector_attach_encoder(connector, encoder);
 137
 138         return connector;
 139 }