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