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, intel_dsi->dcs_backlight_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, intel_dsi->dcs_backlight_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 mipi_dsi_device *dsi_device; 97 enum port port; 98 99 dcs_set_backlight(conn_state, 0); 100 101 for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) { 102 u8 cabc = POWER_SAVE_OFF; 103 104 dsi_device = intel_dsi->dsi_hosts[port]->device; 105 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE, 106 &cabc, sizeof(cabc)); 107 } 108 109 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) { 110 u8 ctrl = 0; 111 112 dsi_device = intel_dsi->dsi_hosts[port]->device; 113 114 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY, 115 &ctrl, sizeof(ctrl)); 116 117 ctrl &= ~CONTROL_DISPLAY_BL; 118 ctrl &= ~CONTROL_DISPLAY_DD; 119 ctrl &= ~CONTROL_DISPLAY_BCTRL; 120 121 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY, 122 &ctrl, sizeof(ctrl)); 123 } 124 } 125 126 static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state, 127 const struct drm_connector_state *conn_state, u32 level) 128 { 129 struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder)); 130 struct mipi_dsi_device *dsi_device; 131 enum port port; 132 133 for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) { 134 u8 ctrl = 0; 135 136 dsi_device = intel_dsi->dsi_hosts[port]->device; 137 138 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY, 139 &ctrl, sizeof(ctrl)); 140 141 ctrl |= CONTROL_DISPLAY_BL; 142 ctrl |= CONTROL_DISPLAY_DD; 143 ctrl |= CONTROL_DISPLAY_BCTRL; 144 145 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY, 146 &ctrl, sizeof(ctrl)); 147 } 148 149 for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) { 150 u8 cabc = POWER_SAVE_MEDIUM; 151 152 dsi_device = intel_dsi->dsi_hosts[port]->device; 153 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE, 154 &cabc, sizeof(cabc)); 155 } 156 157 dcs_set_backlight(conn_state, level); 158 } 159 160 static int dcs_setup_backlight(struct intel_connector *connector, 161 enum pipe unused) 162 { 163 struct drm_device *dev = connector->base.dev; 164 struct drm_i915_private *dev_priv = to_i915(dev); 165 struct intel_panel *panel = &connector->panel; 166 167 if (dev_priv->vbt.backlight.brightness_precision_bits > 8) 168 panel->backlight.max = (1 << dev_priv->vbt.backlight.brightness_precision_bits) - 1; 169 else 170 panel->backlight.max = PANEL_PWM_MAX_VALUE; 171 172 panel->backlight.level = panel->backlight.max; 173 174 return 0; 175 } 176 177 static const struct intel_panel_bl_funcs dcs_bl_funcs = { 178 .setup = dcs_setup_backlight, 179 .enable = dcs_enable_backlight, 180 .disable = dcs_disable_backlight, 181 .set = dcs_set_backlight, 182 .get = dcs_get_backlight, 183 }; 184 185 int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector) 186 { 187 struct drm_device *dev = intel_connector->base.dev; 188 struct drm_i915_private *dev_priv = to_i915(dev); 189 struct intel_encoder *encoder = intel_attached_encoder(intel_connector); 190 struct intel_panel *panel = &intel_connector->panel; 191 192 if (dev_priv->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS) 193 return -ENODEV; 194 195 if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI)) 196 return -EINVAL; 197 198 panel->backlight.funcs = &dcs_bl_funcs; 199 200 return 0; 201 } 202