1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* Hisilicon Hibmc SoC drm driver 3 * 4 * Based on the bochs drm driver. 5 * 6 * Copyright (c) 2016 Huawei Limited. 7 * 8 * Author: 9 * Rongrong Zou <zourongrong@huawei.com> 10 * Rongrong Zou <zourongrong@gmail.com> 11 * Jianhua Li <lijianhua@huawei.com> 12 */ 13 14 #include <drm/drm_gem_vram_helper.h> 15 #include <drm/drm_atomic_helper.h> 16 #include <drm/drm_probe_helper.h> 17 #include <drm/drm_crtc_helper.h> 18 #include <drm/drm_print.h> 19 20 #include "hibmc_drm_drv.h" 21 #include "hibmc_drm_regs.h" 22 23 static int hibmc_connector_get_modes(struct drm_connector *connector) 24 { 25 int count; 26 27 count = drm_add_modes_noedid(connector, 28 connector->dev->mode_config.max_width, 29 connector->dev->mode_config.max_height); 30 drm_set_preferred_mode(connector, 1024, 768); 31 32 return count; 33 } 34 35 static enum drm_mode_status hibmc_connector_mode_valid(struct drm_connector *connector, 36 struct drm_display_mode *mode) 37 { 38 return MODE_OK; 39 } 40 41 static const struct drm_connector_helper_funcs 42 hibmc_connector_helper_funcs = { 43 .get_modes = hibmc_connector_get_modes, 44 .mode_valid = hibmc_connector_mode_valid, 45 }; 46 47 static const struct drm_connector_funcs hibmc_connector_funcs = { 48 .fill_modes = drm_helper_probe_single_connector_modes, 49 .destroy = drm_connector_cleanup, 50 .reset = drm_atomic_helper_connector_reset, 51 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 52 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 53 }; 54 55 static struct drm_connector * 56 hibmc_connector_init(struct hibmc_drm_private *priv) 57 { 58 struct drm_device *dev = priv->dev; 59 struct drm_connector *connector; 60 int ret; 61 62 connector = devm_kzalloc(dev->dev, sizeof(*connector), GFP_KERNEL); 63 if (!connector) { 64 DRM_ERROR("failed to alloc memory when init connector\n"); 65 return ERR_PTR(-ENOMEM); 66 } 67 68 ret = drm_connector_init(dev, connector, 69 &hibmc_connector_funcs, 70 DRM_MODE_CONNECTOR_VGA); 71 if (ret) { 72 DRM_ERROR("failed to init connector: %d\n", ret); 73 return ERR_PTR(ret); 74 } 75 drm_connector_helper_add(connector, 76 &hibmc_connector_helper_funcs); 77 78 return connector; 79 } 80 81 static void hibmc_encoder_mode_set(struct drm_encoder *encoder, 82 struct drm_display_mode *mode, 83 struct drm_display_mode *adj_mode) 84 { 85 u32 reg; 86 struct drm_device *dev = encoder->dev; 87 struct hibmc_drm_private *priv = dev->dev_private; 88 89 reg = readl(priv->mmio + HIBMC_DISPLAY_CONTROL_HISILE); 90 reg |= HIBMC_DISPLAY_CONTROL_FPVDDEN(1); 91 reg |= HIBMC_DISPLAY_CONTROL_PANELDATE(1); 92 reg |= HIBMC_DISPLAY_CONTROL_FPEN(1); 93 reg |= HIBMC_DISPLAY_CONTROL_VBIASEN(1); 94 writel(reg, priv->mmio + HIBMC_DISPLAY_CONTROL_HISILE); 95 } 96 97 static const struct drm_encoder_helper_funcs hibmc_encoder_helper_funcs = { 98 .mode_set = hibmc_encoder_mode_set, 99 }; 100 101 static const struct drm_encoder_funcs hibmc_encoder_funcs = { 102 .destroy = drm_encoder_cleanup, 103 }; 104 105 int hibmc_vdac_init(struct hibmc_drm_private *priv) 106 { 107 struct drm_device *dev = priv->dev; 108 struct drm_encoder *encoder; 109 struct drm_connector *connector; 110 int ret; 111 112 connector = hibmc_connector_init(priv); 113 if (IS_ERR(connector)) { 114 DRM_ERROR("failed to create connector: %ld\n", 115 PTR_ERR(connector)); 116 return PTR_ERR(connector); 117 } 118 119 encoder = devm_kzalloc(dev->dev, sizeof(*encoder), GFP_KERNEL); 120 if (!encoder) { 121 DRM_ERROR("failed to alloc memory when init encoder\n"); 122 return -ENOMEM; 123 } 124 125 encoder->possible_crtcs = 0x1; 126 ret = drm_encoder_init(dev, encoder, &hibmc_encoder_funcs, 127 DRM_MODE_ENCODER_DAC, NULL); 128 if (ret) { 129 DRM_ERROR("failed to init encoder: %d\n", ret); 130 return ret; 131 } 132 133 drm_encoder_helper_add(encoder, &hibmc_encoder_helper_funcs); 134 drm_connector_attach_encoder(connector, encoder); 135 136 return 0; 137 } 138