1 /* 2 * Copyright © 2016 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 * 23 * Author: Deepak M <m.deepak at intel.com> 24 */ 25 26 #include <drm/drm_mipi_dsi.h> 27 #include <video/mipi_display.h> 28 29 #include "i915_drv.h" 30 #include "intel_display_types.h" 31 #include "intel_dsi.h" 32 #include "intel_dsi_dcs_backlight.h" 33 34 #define CONTROL_DISPLAY_BCTRL (1 << 5) 35 #define CONTROL_DISPLAY_DD (1 << 3) 36 #define CONTROL_DISPLAY_BL (1 << 2) 37 38 #define POWER_SAVE_OFF (0 << 0) 39 #define POWER_SAVE_LOW (1 << 0) 40 #define POWER_SAVE_MEDIUM (2 << 0) 41 #define POWER_SAVE_HIGH (3 << 0) 42 #define POWER_SAVE_OUTDOOR_MODE (4 << 0) 43 44 #define PANEL_PWM_MAX_VALUE 0xFF 45 46 static u32 dcs_get_backlight(struct intel_connector *connector, enum pipe unused) 47 { 48 struct intel_encoder *encoder = intel_attached_encoder(connector); 49 struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder); 50 struct intel_panel *panel = &connector->panel; 51 struct mipi_dsi_device *dsi_device; 52 u8 data[2] = {}; 53 enum port port; 54 size_t len = panel->backlight.max > U8_MAX ? 2 : 1; 55 56 for_each_dsi_port(port, panel->vbt.dsi.bl_ports) { 57 dsi_device = intel_dsi->dsi_hosts[port]->device; 58 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_DISPLAY_BRIGHTNESS, 59 &data, len); 60 break; 61 } 62 63 return (data[1] << 8) | data[0]; 64 } 65 66 static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level) 67 { 68 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder)); 69 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel; 70 struct mipi_dsi_device *dsi_device; 71 u8 data[2] = {}; 72 enum port port; 73 size_t len = panel->backlight.max > U8_MAX ? 2 : 1; 74 unsigned long mode_flags; 75 76 if (len == 1) { 77 data[0] = level; 78 } else { 79 data[0] = level >> 8; 80 data[1] = level; 81 } 82 83 for_each_dsi_port(port, panel->vbt.dsi.bl_ports) { 84 dsi_device = intel_dsi->dsi_hosts[port]->device; 85 mode_flags = dsi_device->mode_flags; 86 dsi_device->mode_flags &= ~MIPI_DSI_MODE_LPM; 87 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS, 88 &data, len); 89 dsi_device->mode_flags = mode_flags; 90 } 91 } 92 93 static void dcs_disable_backlight(const struct drm_connector_state *conn_state, u32 level) 94 { 95 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder)); 96 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel; 97 struct mipi_dsi_device *dsi_device; 98 enum port port; 99 100 dcs_set_backlight(conn_state, 0); 101 102 for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) { 103 u8 cabc = POWER_SAVE_OFF; 104 105 dsi_device = intel_dsi->dsi_hosts[port]->device; 106 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE, 107 &cabc, sizeof(cabc)); 108 } 109 110 for_each_dsi_port(port, panel->vbt.dsi.bl_ports) { 111 u8 ctrl = 0; 112 113 dsi_device = intel_dsi->dsi_hosts[port]->device; 114 115 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY, 116 &ctrl, sizeof(ctrl)); 117 118 ctrl &= ~CONTROL_DISPLAY_BL; 119 ctrl &= ~CONTROL_DISPLAY_DD; 120 ctrl &= ~CONTROL_DISPLAY_BCTRL; 121 122 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY, 123 &ctrl, sizeof(ctrl)); 124 } 125 } 126 127 static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state, 128 const struct drm_connector_state *conn_state, u32 level) 129 { 130 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder)); 131 struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel; 132 struct mipi_dsi_device *dsi_device; 133 enum port port; 134 135 for_each_dsi_port(port, panel->vbt.dsi.bl_ports) { 136 u8 ctrl = 0; 137 138 dsi_device = intel_dsi->dsi_hosts[port]->device; 139 140 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY, 141 &ctrl, sizeof(ctrl)); 142 143 ctrl |= CONTROL_DISPLAY_BL; 144 ctrl |= CONTROL_DISPLAY_DD; 145 ctrl |= CONTROL_DISPLAY_BCTRL; 146 147 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY, 148 &ctrl, sizeof(ctrl)); 149 } 150 151 for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) { 152 u8 cabc = POWER_SAVE_MEDIUM; 153 154 dsi_device = intel_dsi->dsi_hosts[port]->device; 155 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE, 156 &cabc, sizeof(cabc)); 157 } 158 159 dcs_set_backlight(conn_state, level); 160 } 161 162 static int dcs_setup_backlight(struct intel_connector *connector, 163 enum pipe unused) 164 { 165 struct drm_i915_private *i915 = to_i915(connector->base.dev); 166 struct intel_panel *panel = &connector->panel; 167 168 if (panel->vbt.backlight.brightness_precision_bits > 8) 169 panel->backlight.max = (1 << panel->vbt.backlight.brightness_precision_bits) - 1; 170 else 171 panel->backlight.max = PANEL_PWM_MAX_VALUE; 172 173 panel->backlight.level = panel->backlight.max; 174 175 drm_dbg_kms(&i915->drm, 176 "[CONNECTOR:%d:%s] Using DCS for backlight control\n", 177 connector->base.base.id, connector->base.name); 178 179 return 0; 180 } 181 182 static const struct intel_panel_bl_funcs dcs_bl_funcs = { 183 .setup = dcs_setup_backlight, 184 .enable = dcs_enable_backlight, 185 .disable = dcs_disable_backlight, 186 .set = dcs_set_backlight, 187 .get = dcs_get_backlight, 188 }; 189 190 int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector) 191 { 192 struct drm_device *dev = intel_connector->base.dev; 193 struct intel_encoder *encoder = intel_attached_encoder(intel_connector); 194 struct intel_panel *panel = &intel_connector->panel; 195 196 if (panel->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS) 197 return -ENODEV; 198 199 if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI)) 200 return -EINVAL; 201 202 panel->backlight.funcs = &dcs_bl_funcs; 203 204 return 0; 205 } 206