drivers/gpu/drm/ast/ast_vga.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_vga_encoder_funcs = {
  17         .destroy = drm_encoder_cleanup,
  18 };
  19
  20 /*
  21  * Connector
  22  */
  23
  24 static int ast_vga_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                 drm_edid_connector_update(connector, NULL);
  33
  34                 /*
  35                  * There's no EDID data without a connected monitor. Set BMC-
  36                  * compatible modes in this case. The XGA default resolution
  37                  * should work well for all BMCs.
  38                  */
  39                 count = drm_add_modes_noedid(connector, 4096, 4096);
  40                 if (count)
  41                         drm_set_preferred_mode(connector, 1024, 768);
  42         }
  43
  44         return count;
  45 }
  46
  47 static int ast_vga_connector_helper_detect_ctx(struct drm_connector *connector,
  48                                                struct drm_modeset_acquire_ctx *ctx,
  49                                                bool force)
  50 {
  51         struct ast_connector *ast_connector = to_ast_connector(connector);
  52         enum drm_connector_status status;
  53
  54         status = drm_connector_helper_detect_from_ddc(connector, ctx, force);
  55
  56         if (status != ast_connector->physical_status)
  57                 ++connector->epoch_counter;
  58         ast_connector->physical_status = status;
  59
  60         return connector_status_connected;
  61 }
  62
  63 static const struct drm_connector_helper_funcs ast_vga_connector_helper_funcs = {
  64         .get_modes = ast_vga_connector_helper_get_modes,
  65         .detect_ctx = ast_vga_connector_helper_detect_ctx,
  66 };
  67
  68 static const struct drm_connector_funcs ast_vga_connector_funcs = {
  69         .reset = drm_atomic_helper_connector_reset,
  70         .fill_modes = drm_helper_probe_single_connector_modes,
  71         .destroy = drm_connector_cleanup,
  72         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  73         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  74 };
  75
  76 /*
  77  * Output
  78  */
  79
  80 int ast_vga_output_init(struct ast_device *ast)
  81 {
  82         struct drm_device *dev = &ast->base;
  83         struct drm_crtc *crtc = &ast->crtc;
  84         struct i2c_adapter *ddc;
  85         struct drm_encoder *encoder;
  86         struct ast_connector *ast_connector;
  87         struct drm_connector *connector;
  88         int ret;
  89
  90         /* DDC */
  91
  92         ddc = ast_ddc_create(ast);
  93         if (IS_ERR(ddc))
  94                 return PTR_ERR(ddc);
  95
  96         /* encoder */
  97
  98         encoder = &ast->output.vga.encoder;
  99         ret = drm_encoder_init(dev, encoder, &ast_vga_encoder_funcs,
 100                                DRM_MODE_ENCODER_DAC, NULL);
 101         if (ret)
 102                 return ret;
 103         encoder->possible_crtcs = drm_crtc_mask(crtc);
 104
 105         /* connector */
 106
 107         ast_connector = &ast->output.vga.connector;
 108         connector = &ast_connector->base;
 109         ret = drm_connector_init_with_ddc(dev, connector, &ast_vga_connector_funcs,
 110                                           DRM_MODE_CONNECTOR_VGA, ddc);
 111         if (ret)
 112                 return ret;
 113         drm_connector_helper_add(connector, &ast_vga_connector_helper_funcs);
 114
 115         connector->interlace_allowed = 0;
 116         connector->doublescan_allowed = 0;
 117         connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
 118
 119         ast_connector->physical_status = connector->status;
 120
 121         ret = drm_connector_attach_encoder(connector, encoder);
 122         if (ret)
 123                 return ret;
 124
 125         return 0;
 126 }