drivers/gpu/drm/ast/ast_sil164.c

   1 // SPDX-License-Identifier: MIT
   2
   3 #include <drm/drm_atomic_state_helper.h>
   4 #include <drm/drm_edid.h>
   5 #include <drm/drm_modeset_helper_vtables.h>
   6 #include <drm/drm_print.h>
   7 #include <drm/drm_probe_helper.h>
   8
   9 #include "ast_ddc.h"
  10 #include "ast_drv.h"
  11
  12 /*
  13  * Encoder
  14  */
  15
  16 static const struct drm_encoder_funcs ast_sil164_encoder_funcs = {
  17         .destroy = drm_encoder_cleanup,
  18 };
  19
  20 /*
  21  * Connector
  22  */
  23
  24 static int ast_sil164_connector_helper_get_modes(struct drm_connector *connector)
  25 {
  26         struct ast_connector *ast_connector = to_ast_connector(connector);
  27         int count;
  28
  29         if (ast_connector->physical_status == connector_status_connected) {
  30                 count = drm_connector_helper_get_modes(connector);
  31         } else {
  32                 /*
  33                  * There's no EDID data without a connected monitor. Set BMC-
  34                  * compatible modes in this case. The XGA default resolution
  35                  * should work well for all BMCs.
  36                  */
  37                 count = drm_add_modes_noedid(connector, 4096, 4096);
  38                 if (count)
  39                         drm_set_preferred_mode(connector, 1024, 768);
  40         }
  41
  42         return count;
  43 }
  44
  45 static int ast_sil164_connector_helper_detect_ctx(struct drm_connector *connector,
  46                                                   struct drm_modeset_acquire_ctx *ctx,
  47                                                   bool force)
  48 {
  49         struct ast_connector *ast_connector = to_ast_connector(connector);
  50         enum drm_connector_status status;
  51
  52         status = drm_connector_helper_detect_from_ddc(connector, ctx, force);
  53
  54         if (status != ast_connector->physical_status)
  55                 ++connector->epoch_counter;
  56         ast_connector->physical_status = status;
  57
  58         return connector_status_connected;
  59 }
  60
  61 static const struct drm_connector_helper_funcs ast_sil164_connector_helper_funcs = {
  62         .get_modes = ast_sil164_connector_helper_get_modes,
  63         .detect_ctx = ast_sil164_connector_helper_detect_ctx,
  64 };
  65
  66 static const struct drm_connector_funcs ast_sil164_connector_funcs = {
  67         .reset = drm_atomic_helper_connector_reset,
  68         .fill_modes = drm_helper_probe_single_connector_modes,
  69         .destroy = drm_connector_cleanup,
  70         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  71         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  72 };
  73
  74 static int ast_sil164_connector_init(struct drm_device *dev, struct drm_connector *connector)
  75 {
  76         struct ast_device *ast = to_ast_device(dev);
  77         struct i2c_adapter *ddc;
  78         int ret;
  79
  80         ddc = ast_ddc_create(ast);
  81         if (IS_ERR(ddc)) {
  82                 ret = PTR_ERR(ddc);
  83                 drm_err(dev, "failed to add DDC bus for connector; ret=%d\n", ret);
  84                 return ret;
  85         }
  86
  87         ret = drm_connector_init_with_ddc(dev, connector, &ast_sil164_connector_funcs,
  88                                           DRM_MODE_CONNECTOR_DVII, ddc);
  89         if (ret)
  90                 return ret;
  91
  92         drm_connector_helper_add(connector, &ast_sil164_connector_helper_funcs);
  93
  94         connector->interlace_allowed = 0;
  95         connector->doublescan_allowed = 0;
  96
  97         connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
  98
  99         return 0;
 100 }
 101
 102 int ast_sil164_output_init(struct ast_device *ast)
 103 {
 104         struct drm_device *dev = &ast->base;
 105         struct drm_crtc *crtc = &ast->crtc;
 106         struct drm_encoder *encoder = &ast->output.sil164.encoder;
 107         struct ast_connector *ast_connector = &ast->output.sil164.connector;
 108         struct drm_connector *connector = &ast_connector->base;
 109         int ret;
 110
 111         ret = drm_encoder_init(dev, encoder, &ast_sil164_encoder_funcs,
 112                                DRM_MODE_ENCODER_TMDS, NULL);
 113         if (ret)
 114                 return ret;
 115         encoder->possible_crtcs = drm_crtc_mask(crtc);
 116
 117         ret = ast_sil164_connector_init(dev, connector);
 118         if (ret)
 119                 return ret;
 120         ast_connector->physical_status = connector->status;
 121
 122         ret = drm_connector_attach_encoder(connector, encoder);
 123         if (ret)
 124                 return ret;
 125
 126         return 0;
 127 }