nouveau_backlight.c revision 1.2
1 /* $NetBSD: nouveau_backlight.c,v 1.2 2018/08/27 04:58:24 riastradh Exp $ */ 2 3 /* 4 * Copyright (C) 2009 Red Hat <mjg (at) redhat.com> 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining 7 * a copy of this software and associated documentation files (the 8 * "Software"), to deal in the Software without restriction, including 9 * without limitation the rights to use, copy, modify, merge, publish, 10 * distribute, sublicense, and/or sell copies of the Software, and to 11 * permit persons to whom the Software is furnished to do so, subject to 12 * the following conditions: 13 * 14 * The above copyright notice and this permission notice (including the 15 * next paragraph) shall be included in all copies or substantial 16 * portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 19 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 21 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE 22 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION 24 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 25 * 26 */ 27 28 /* 29 * Authors: 30 * Matthew Garrett <mjg (at) redhat.com> 31 * 32 * Register locations derived from NVClock by Roderick Colenbrander 33 */ 34 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: nouveau_backlight.c,v 1.2 2018/08/27 04:58:24 riastradh Exp $"); 37 38 #include <linux/backlight.h> 39 40 #include "nouveau_drm.h" 41 #include "nouveau_reg.h" 42 #include "nouveau_encoder.h" 43 44 static int 45 nv40_get_intensity(struct backlight_device *bd) 46 { 47 struct nouveau_drm *drm = bl_get_data(bd); 48 struct nvif_object *device = &drm->device.object; 49 int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) & 50 NV40_PMC_BACKLIGHT_MASK) >> 16; 51 52 return val; 53 } 54 55 static int 56 nv40_set_intensity(struct backlight_device *bd) 57 { 58 struct nouveau_drm *drm = bl_get_data(bd); 59 struct nvif_object *device = &drm->device.object; 60 int val = bd->props.brightness; 61 int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT); 62 63 nvif_wr32(device, NV40_PMC_BACKLIGHT, 64 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK)); 65 66 return 0; 67 } 68 69 static const struct backlight_ops nv40_bl_ops = { 70 .options = BL_CORE_SUSPENDRESUME, 71 .get_brightness = nv40_get_intensity, 72 .update_status = nv40_set_intensity, 73 }; 74 75 static int 76 nv40_backlight_init(struct drm_connector *connector) 77 { 78 struct nouveau_drm *drm = nouveau_drm(connector->dev); 79 struct nvif_object *device = &drm->device.object; 80 struct backlight_properties props; 81 struct backlight_device *bd; 82 83 if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)) 84 return 0; 85 86 memset(&props, 0, sizeof(struct backlight_properties)); 87 props.type = BACKLIGHT_RAW; 88 props.max_brightness = 31; 89 bd = backlight_device_register("nv_backlight", connector->kdev, drm, 90 &nv40_bl_ops, &props); 91 if (IS_ERR(bd)) 92 return PTR_ERR(bd); 93 drm->backlight = bd; 94 bd->props.brightness = nv40_get_intensity(bd); 95 backlight_update_status(bd); 96 97 return 0; 98 } 99 100 static int 101 nv50_get_intensity(struct backlight_device *bd) 102 { 103 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 104 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 105 struct nvif_object *device = &drm->device.object; 106 int or = nv_encoder->or; 107 u32 div = 1025; 108 u32 val; 109 110 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or)); 111 val &= NV50_PDISP_SOR_PWM_CTL_VAL; 112 return ((val * 100) + (div / 2)) / div; 113 } 114 115 static int 116 nv50_set_intensity(struct backlight_device *bd) 117 { 118 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 119 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 120 struct nvif_object *device = &drm->device.object; 121 int or = nv_encoder->or; 122 u32 div = 1025; 123 u32 val = (bd->props.brightness * div) / 100; 124 125 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), 126 NV50_PDISP_SOR_PWM_CTL_NEW | val); 127 return 0; 128 } 129 130 static const struct backlight_ops nv50_bl_ops = { 131 .options = BL_CORE_SUSPENDRESUME, 132 .get_brightness = nv50_get_intensity, 133 .update_status = nv50_set_intensity, 134 }; 135 136 static int 137 nva3_get_intensity(struct backlight_device *bd) 138 { 139 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 140 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 141 struct nvif_object *device = &drm->device.object; 142 int or = nv_encoder->or; 143 u32 div, val; 144 145 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or)); 146 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or)); 147 val &= NVA3_PDISP_SOR_PWM_CTL_VAL; 148 if (div && div >= val) 149 return ((val * 100) + (div / 2)) / div; 150 151 return 100; 152 } 153 154 static int 155 nva3_set_intensity(struct backlight_device *bd) 156 { 157 struct nouveau_encoder *nv_encoder = bl_get_data(bd); 158 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); 159 struct nvif_object *device = &drm->device.object; 160 int or = nv_encoder->or; 161 u32 div, val; 162 163 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or)); 164 val = (bd->props.brightness * div) / 100; 165 if (div) { 166 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), val | 167 NV50_PDISP_SOR_PWM_CTL_NEW | 168 NVA3_PDISP_SOR_PWM_CTL_UNK); 169 return 0; 170 } 171 172 return -EINVAL; 173 } 174 175 static const struct backlight_ops nva3_bl_ops = { 176 .options = BL_CORE_SUSPENDRESUME, 177 .get_brightness = nva3_get_intensity, 178 .update_status = nva3_set_intensity, 179 }; 180 181 static int 182 nv50_backlight_init(struct drm_connector *connector) 183 { 184 struct nouveau_drm *drm = nouveau_drm(connector->dev); 185 struct nvif_object *device = &drm->device.object; 186 struct nouveau_encoder *nv_encoder; 187 struct backlight_properties props; 188 struct backlight_device *bd; 189 const struct backlight_ops *ops; 190 191 nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS); 192 if (!nv_encoder) { 193 nv_encoder = find_encoder(connector, DCB_OUTPUT_DP); 194 if (!nv_encoder) 195 return -ENODEV; 196 } 197 198 if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(nv_encoder->or))) 199 return 0; 200 201 if (drm->device.info.chipset <= 0xa0 || 202 drm->device.info.chipset == 0xaa || 203 drm->device.info.chipset == 0xac) 204 ops = &nv50_bl_ops; 205 else 206 ops = &nva3_bl_ops; 207 208 memset(&props, 0, sizeof(struct backlight_properties)); 209 props.type = BACKLIGHT_RAW; 210 props.max_brightness = 100; 211 bd = backlight_device_register("nv_backlight", connector->kdev, 212 nv_encoder, ops, &props); 213 if (IS_ERR(bd)) 214 return PTR_ERR(bd); 215 216 drm->backlight = bd; 217 bd->props.brightness = bd->ops->get_brightness(bd); 218 backlight_update_status(bd); 219 return 0; 220 } 221 222 int 223 nouveau_backlight_init(struct drm_device *dev) 224 { 225 struct nouveau_drm *drm = nouveau_drm(dev); 226 struct nvif_device *device = &drm->device; 227 struct drm_connector *connector; 228 229 list_for_each_entry(connector, &dev->mode_config.connector_list, head) { 230 if (connector->connector_type != DRM_MODE_CONNECTOR_LVDS && 231 connector->connector_type != DRM_MODE_CONNECTOR_eDP) 232 continue; 233 234 switch (device->info.family) { 235 case NV_DEVICE_INFO_V0_CURIE: 236 return nv40_backlight_init(connector); 237 case NV_DEVICE_INFO_V0_TESLA: 238 case NV_DEVICE_INFO_V0_FERMI: 239 case NV_DEVICE_INFO_V0_KEPLER: 240 return nv50_backlight_init(connector); 241 default: 242 break; 243 } 244 } 245 246 247 return 0; 248 } 249 250 void 251 nouveau_backlight_exit(struct drm_device *dev) 252 { 253 struct nouveau_drm *drm = nouveau_drm(dev); 254 255 if (drm->backlight) { 256 backlight_device_unregister(drm->backlight); 257 drm->backlight = NULL; 258 } 259 } 260
Indexes created Wed Oct 22 13:09:56 GMT 2025