drivers/gpu/drm/tidss/tidss_encoder.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2018 Texas Instruments Incorporated - https://www.ti.com/
   4  * Author: Tomi Valkeinen <tomi.valkeinen@ti.com>
   5  */
   6
   7 #include <linux/export.h>
   8
   9 #include <drm/drm_crtc.h>
  10 #include <drm/drm_crtc_helper.h>
  11 #include <drm/drm_panel.h>
  12 #include <drm/drm_of.h>
  13
  14 #include "tidss_crtc.h"
  15 #include "tidss_drv.h"
  16 #include "tidss_encoder.h"
  17
  18 static int tidss_encoder_atomic_check(struct drm_encoder *encoder,
  19                                       struct drm_crtc_state *crtc_state,
  20                                       struct drm_connector_state *conn_state)
  21 {
  22         struct drm_device *ddev = encoder->dev;
  23         struct tidss_crtc_state *tcrtc_state = to_tidss_crtc_state(crtc_state);
  24         struct drm_display_info *di = &conn_state->connector->display_info;
  25         struct drm_bridge *bridge;
  26         bool bus_flags_set = false;
  27
  28         dev_dbg(ddev->dev, "%s\n", __func__);
  29
  30         /*
  31          * Take the bus_flags from the first bridge that defines
  32          * bridge timings, or from the connector's display_info if no
  33          * bridge defines the timings.
  34          */
  35         drm_for_each_bridge_in_chain(encoder, bridge) {
  36                 if (!bridge->timings)
  37                         continue;
  38
  39                 tcrtc_state->bus_flags = bridge->timings->input_bus_flags;
  40                 bus_flags_set = true;
  41                 break;
  42         }
  43
  44         if (!di->bus_formats || di->num_bus_formats == 0)  {
  45                 dev_err(ddev->dev, "%s: No bus_formats in connected display\n",
  46                         __func__);
  47                 return -EINVAL;
  48         }
  49
  50         // XXX any cleaner way to set bus format and flags?
  51         tcrtc_state->bus_format = di->bus_formats[0];
  52         if (!bus_flags_set)
  53                 tcrtc_state->bus_flags = di->bus_flags;
  54
  55         return 0;
  56 }
  57
  58 static void tidss_encoder_destroy(struct drm_encoder *encoder)
  59 {
  60         drm_encoder_cleanup(encoder);
  61         kfree(encoder);
  62 }
  63
  64 static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
  65         .atomic_check = tidss_encoder_atomic_check,
  66 };
  67
  68 static const struct drm_encoder_funcs encoder_funcs = {
  69         .destroy = tidss_encoder_destroy,
  70 };
  71
  72 struct drm_encoder *tidss_encoder_create(struct tidss_device *tidss,
  73                                          u32 encoder_type, u32 possible_crtcs)
  74 {
  75         struct drm_encoder *enc;
  76         int ret;
  77
  78         enc = kzalloc(sizeof(*enc), GFP_KERNEL);
  79         if (!enc)
  80                 return ERR_PTR(-ENOMEM);
  81
  82         enc->possible_crtcs = possible_crtcs;
  83
  84         ret = drm_encoder_init(&tidss->ddev, enc, &encoder_funcs,
  85                                encoder_type, NULL);
  86         if (ret < 0) {
  87                 kfree(enc);
  88                 return ERR_PTR(ret);
  89         }
  90
  91         drm_encoder_helper_add(enc, &encoder_helper_funcs);
  92
  93         dev_dbg(tidss->dev, "Encoder create done\n");
  94
  95         return enc;
  96 }