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 mipi_dsi_device *dsi_device;
  51         u8 data = 0;
  52         enum port port;
  53
  54         /* FIXME: Need to take care of 16 bit brightness level */
  55         for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
  56                 dsi_device = intel_dsi->dsi_hosts[port]->device;
  57                 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
  58                                   &data, sizeof(data));
  59                 break;
  60         }
  61
  62         return data;
  63 }
  64
  65 static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level)
  66 {
  67         struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
  68         struct mipi_dsi_device *dsi_device;
  69         u8 data = level;
  70         enum port port;
  71
  72         /* FIXME: Need to take care of 16 bit brightness level */
  73         for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
  74                 dsi_device = intel_dsi->dsi_hosts[port]->device;
  75                 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
  76                                    &data, sizeof(data));
  77         }
  78 }
  79
  80 static void dcs_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
  81 {
  82         struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
  83         struct mipi_dsi_device *dsi_device;
  84         enum port port;
  85
  86         dcs_set_backlight(conn_state, 0);
  87
  88         for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
  89                 u8 cabc = POWER_SAVE_OFF;
  90
  91                 dsi_device = intel_dsi->dsi_hosts[port]->device;
  92                 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
  93                                    &cabc, sizeof(cabc));
  94         }
  95
  96         for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
  97                 u8 ctrl = 0;
  98
  99                 dsi_device = intel_dsi->dsi_hosts[port]->device;
 100
 101                 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
 102                                   &ctrl, sizeof(ctrl));
 103
 104                 ctrl &= ~CONTROL_DISPLAY_BL;
 105                 ctrl &= ~CONTROL_DISPLAY_DD;
 106                 ctrl &= ~CONTROL_DISPLAY_BCTRL;
 107
 108                 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
 109                                    &ctrl, sizeof(ctrl));
 110         }
 111 }
 112
 113 static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
 114                                  const struct drm_connector_state *conn_state, u32 level)
 115 {
 116         struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
 117         struct mipi_dsi_device *dsi_device;
 118         enum port port;
 119
 120         for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
 121                 u8 ctrl = 0;
 122
 123                 dsi_device = intel_dsi->dsi_hosts[port]->device;
 124
 125                 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
 126                                   &ctrl, sizeof(ctrl));
 127
 128                 ctrl |= CONTROL_DISPLAY_BL;
 129                 ctrl |= CONTROL_DISPLAY_DD;
 130                 ctrl |= CONTROL_DISPLAY_BCTRL;
 131
 132                 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
 133                                    &ctrl, sizeof(ctrl));
 134         }
 135
 136         for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
 137                 u8 cabc = POWER_SAVE_MEDIUM;
 138
 139                 dsi_device = intel_dsi->dsi_hosts[port]->device;
 140                 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
 141                                    &cabc, sizeof(cabc));
 142         }
 143
 144         dcs_set_backlight(conn_state, level);
 145 }
 146
 147 static int dcs_setup_backlight(struct intel_connector *connector,
 148                                enum pipe unused)
 149 {
 150         struct intel_panel *panel = &connector->panel;
 151
 152         panel->backlight.max = PANEL_PWM_MAX_VALUE;
 153         panel->backlight.level = PANEL_PWM_MAX_VALUE;
 154
 155         return 0;
 156 }
 157
 158 static const struct intel_panel_bl_funcs dcs_bl_funcs = {
 159         .setup = dcs_setup_backlight,
 160         .enable = dcs_enable_backlight,
 161         .disable = dcs_disable_backlight,
 162         .set = dcs_set_backlight,
 163         .get = dcs_get_backlight,
 164 };
 165
 166 int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
 167 {
 168         struct drm_device *dev = intel_connector->base.dev;
 169         struct drm_i915_private *dev_priv = to_i915(dev);
 170         struct intel_encoder *encoder = intel_attached_encoder(intel_connector);
 171         struct intel_panel *panel = &intel_connector->panel;
 172
 173         if (dev_priv->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
 174                 return -ENODEV;
 175
 176         if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI))
 177                 return -EINVAL;
 178
 179         panel->backlight.funcs = &dcs_bl_funcs;
 180
 181         return 0;
 182 }