drivers/gpu/drm/i915/display/intel_dsi_dcs_backlight.c

   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 }