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 } 97