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 enum drm_mode_status
  60 mdp4_lvds_connector_mode_valid(struct drm_connector *connector,
  61                                struct drm_display_mode *mode)
  62 {
  63         struct mdp4_lvds_connector *mdp4_lvds_connector =
  64                         to_mdp4_lvds_connector(connector);
  65         struct drm_encoder *encoder = mdp4_lvds_connector->encoder;
  66         long actual, requested;
  67
  68         requested = 1000 * mode->clock;
  69         actual = mdp4_lcdc_round_pixclk(encoder, requested);
  70
  71         DBG("requested=%ld, actual=%ld", requested, actual);
  72
  73         if (actual != requested)
  74                 return MODE_CLOCK_RANGE;
  75
  76         return MODE_OK;
  77 }
  78
  79 static const struct drm_connector_funcs mdp4_lvds_connector_funcs = {
  80         .detect = mdp4_lvds_connector_detect,
  81         .fill_modes = drm_helper_probe_single_connector_modes,
  82         .destroy = mdp4_lvds_connector_destroy,
  83         .reset = drm_atomic_helper_connector_reset,
  84         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  85         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  86 };
  87
  88 static const struct drm_connector_helper_funcs mdp4_lvds_connector_helper_funcs = {
  89         .get_modes = mdp4_lvds_connector_get_modes,
  90         .mode_valid = mdp4_lvds_connector_mode_valid,
  91 };
  92
  93 /* initialize connector */
  94 struct drm_connector *mdp4_lvds_connector_init(struct drm_device *dev,
  95                 struct device_node *panel_node, struct drm_encoder *encoder)
  96 {
  97         struct drm_connector *connector = NULL;
  98         struct mdp4_lvds_connector *mdp4_lvds_connector;
  99
 100         mdp4_lvds_connector = kzalloc(sizeof(*mdp4_lvds_connector), GFP_KERNEL);
 101         if (!mdp4_lvds_connector)
 102                 return ERR_PTR(-ENOMEM);
 103
 104         mdp4_lvds_connector->encoder = encoder;
 105         mdp4_lvds_connector->panel_node = panel_node;
 106
 107         connector = &mdp4_lvds_connector->base;
 108
 109         drm_connector_init(dev, connector, &mdp4_lvds_connector_funcs,
 110                         DRM_MODE_CONNECTOR_LVDS);
 111         drm_connector_helper_add(connector, &mdp4_lvds_connector_helper_funcs);
 112
 113         connector->polled = 0;
 114
 115         connector->interlace_allowed = 0;
 116         connector->doublescan_allowed = 0;
 117
 118         drm_connector_attach_encoder(connector, encoder);
 119
 120         return connector;
 121 }