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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2014 Red Hat
   4  * Author: Rob Clark <robdclark@gmail.com>
   5  * Author: Vinay Simha <vinaysimha@inforcecomputing.com>
   6  */
   7
   8 #include "mdp4_kms.h"
   9
  10 struct mdp4_lvds_connector {
  11         struct drm_connector base;
  12         struct drm_encoder *encoder;
  13         struct device_node *panel_node;
  14         struct drm_panel *panel;
  15 };
  16 #define to_mdp4_lvds_connector(x) container_of(x, struct mdp4_lvds_connector, base)
  17
  18 static enum drm_connector_status mdp4_lvds_connector_detect(
  19                 struct drm_connector *connector, bool force)
  20 {
  21         struct mdp4_lvds_connector *mdp4_lvds_connector =
  22                         to_mdp4_lvds_connector(connector);
  23
  24         if (!mdp4_lvds_connector->panel) {
  25                 mdp4_lvds_connector->panel =
  26                         of_drm_find_panel(mdp4_lvds_connector->panel_node);
  27                 if (IS_ERR(mdp4_lvds_connector->panel))
  28                         mdp4_lvds_connector->panel = NULL;
  29         }
  30
  31         return mdp4_lvds_connector->panel ?
  32                         connector_status_connected :
  33                         connector_status_disconnected;
  34 }
  35
  36 static void mdp4_lvds_connector_destroy(struct drm_connector *connector)
  37 {
  38         struct mdp4_lvds_connector *mdp4_lvds_connector =
  39                         to_mdp4_lvds_connector(connector);
  40
  41         drm_connector_cleanup(connector);
  42
  43         kfree(mdp4_lvds_connector);
  44 }
  45
  46 static int mdp4_lvds_connector_get_modes(struct drm_connector *connector)
  47 {
  48         struct mdp4_lvds_connector *mdp4_lvds_connector =
  49                         to_mdp4_lvds_connector(connector);
  50         struct drm_panel *panel = mdp4_lvds_connector->panel;
  51         int ret = 0;
  52
  53         if (panel)
  54                 ret = drm_panel_get_modes(panel, connector);
  55
  56         return ret;
  57 }
  58
  59 static int mdp4_lvds_connector_mode_valid(struct drm_connector *connector,
  60                                  struct drm_display_mode *mode)
  61 {
  62         struct mdp4_lvds_connector *mdp4_lvds_connector =
  63                         to_mdp4_lvds_connector(connector);
  64         struct drm_encoder *encoder = mdp4_lvds_connector->encoder;
  65         long actual, requested;
  66
  67         requested = 1000 * mode->clock;
  68         actual = mdp4_lcdc_round_pixclk(encoder, requested);
  69
  70         DBG("requested=%ld, actual=%ld", requested, actual);
  71
  72         if (actual != requested)
  73                 return MODE_CLOCK_RANGE;
  74
  75         return MODE_OK;
  76 }
  77
  78 static const struct drm_connector_funcs mdp4_lvds_connector_funcs = {
  79         .detect = mdp4_lvds_connector_detect,
  80         .fill_modes = drm_helper_probe_single_connector_modes,
  81         .destroy = mdp4_lvds_connector_destroy,
  82         .reset = drm_atomic_helper_connector_reset,
  83         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  84         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  85 };
  86
  87 static const struct drm_connector_helper_funcs mdp4_lvds_connector_helper_funcs = {
  88         .get_modes = mdp4_lvds_connector_get_modes,
  89         .mode_valid = mdp4_lvds_connector_mode_valid,
  90 };
  91
  92 /* initialize connector */
  93 struct drm_connector *mdp4_lvds_connector_init(struct drm_device *dev,
  94                 struct device_node *panel_node, struct drm_encoder *encoder)
  95 {
  96         struct drm_connector *connector = NULL;
  97         struct mdp4_lvds_connector *mdp4_lvds_connector;
  98
  99         mdp4_lvds_connector = kzalloc(sizeof(*mdp4_lvds_connector), GFP_KERNEL);
 100         if (!mdp4_lvds_connector)
 101                 return ERR_PTR(-ENOMEM);
 102
 103         mdp4_lvds_connector->encoder = encoder;
 104         mdp4_lvds_connector->panel_node = panel_node;
 105
 106         connector = &mdp4_lvds_connector->base;
 107
 108         drm_connector_init(dev, connector, &mdp4_lvds_connector_funcs,
 109                         DRM_MODE_CONNECTOR_LVDS);
 110         drm_connector_helper_add(connector, &mdp4_lvds_connector_helper_funcs);
 111
 112         connector->polled = 0;
 113
 114         connector->interlace_allowed = 0;
 115         connector->doublescan_allowed = 0;
 116
 117         drm_connector_attach_encoder(connector, encoder);
 118
 119         return connector;
 120 }