drivers/gpu/drm/i915/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 "intel_drv.h"
  27 #include "intel_dsi.h"
  28 #include "i915_drv.h"
  29 #include <video/mipi_display.h>
  30 #include <drm/drm_mipi_dsi.h>
  31
  32 #define CONTROL_DISPLAY_BCTRL           (1 << 5)
  33 #define CONTROL_DISPLAY_DD              (1 << 3)
  34 #define CONTROL_DISPLAY_BL              (1 << 2)
  35
  36 #define POWER_SAVE_OFF                  (0 << 0)
  37 #define POWER_SAVE_LOW                  (1 << 0)
  38 #define POWER_SAVE_MEDIUM               (2 << 0)
  39 #define POWER_SAVE_HIGH                 (3 << 0)
  40 #define POWER_SAVE_OUTDOOR_MODE         (4 << 0)
  41
  42 #define PANEL_PWM_MAX_VALUE             0xFF
  43
  44 static u32 dcs_get_backlight(struct intel_connector *connector)
  45 {
  46         struct intel_encoder *encoder = connector->encoder;
  47         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
  48         struct mipi_dsi_device *dsi_device;
  49         u8 data = 0;
  50         enum port port;
  51
  52         /* FIXME: Need to take care of 16 bit brightness level */
  53         for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
  54                 dsi_device = intel_dsi->dsi_hosts[port]->device;
  55                 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
  56                                   &data, sizeof(data));
  57                 break;
  58         }
  59
  60         return data;
  61 }
  62
  63 static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level)
  64 {
  65         struct intel_dsi *intel_dsi = enc_to_intel_dsi(conn_state->best_encoder);
  66         struct mipi_dsi_device *dsi_device;
  67         u8 data = level;
  68         enum port port;
  69
  70         /* FIXME: Need to take care of 16 bit brightness level */
  71         for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
  72                 dsi_device = intel_dsi->dsi_hosts[port]->device;
  73                 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
  74                                    &data, sizeof(data));
  75         }
  76 }
  77
  78 static void dcs_disable_backlight(const struct drm_connector_state *conn_state)
  79 {
  80         struct intel_dsi *intel_dsi = enc_to_intel_dsi(conn_state->best_encoder);
  81         struct mipi_dsi_device *dsi_device;
  82         enum port port;
  83
  84         dcs_set_backlight(conn_state, 0);
  85
  86         for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
  87                 u8 cabc = POWER_SAVE_OFF;
  88
  89                 dsi_device = intel_dsi->dsi_hosts[port]->device;
  90                 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
  91                                    &cabc, sizeof(cabc));
  92         }
  93
  94         for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
  95                 u8 ctrl = 0;
  96
  97                 dsi_device = intel_dsi->dsi_hosts[port]->device;
  98
  99                 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
 100                                   &ctrl, sizeof(ctrl));
 101
 102                 ctrl &= ~CONTROL_DISPLAY_BL;
 103                 ctrl &= ~CONTROL_DISPLAY_DD;
 104                 ctrl &= ~CONTROL_DISPLAY_BCTRL;
 105
 106                 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
 107                                    &ctrl, sizeof(ctrl));
 108         }
 109 }
 110
 111 static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
 112                                  const struct drm_connector_state *conn_state)
 113 {
 114         struct intel_dsi *intel_dsi = enc_to_intel_dsi(conn_state->best_encoder);
 115         struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 116         struct mipi_dsi_device *dsi_device;
 117         enum port port;
 118
 119         for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
 120                 u8 ctrl = 0;
 121
 122                 dsi_device = intel_dsi->dsi_hosts[port]->device;
 123
 124                 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
 125                                   &ctrl, sizeof(ctrl));
 126
 127                 ctrl |= CONTROL_DISPLAY_BL;
 128                 ctrl |= CONTROL_DISPLAY_DD;
 129                 ctrl |= CONTROL_DISPLAY_BCTRL;
 130
 131                 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
 132                                    &ctrl, sizeof(ctrl));
 133         }
 134
 135         for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
 136                 u8 cabc = POWER_SAVE_MEDIUM;
 137
 138                 dsi_device = intel_dsi->dsi_hosts[port]->device;
 139                 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
 140                                    &cabc, sizeof(cabc));
 141         }
 142
 143         dcs_set_backlight(conn_state, panel->backlight.level);
 144 }
 145
 146 static int dcs_setup_backlight(struct intel_connector *connector,
 147                                enum pipe unused)
 148 {
 149         struct intel_panel *panel = &connector->panel;
 150
 151         panel->backlight.max = PANEL_PWM_MAX_VALUE;
 152         panel->backlight.level = PANEL_PWM_MAX_VALUE;
 153
 154         return 0;
 155 }
 156
 157 int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
 158 {
 159         struct drm_device *dev = intel_connector->base.dev;
 160         struct drm_i915_private *dev_priv = to_i915(dev);
 161         struct intel_encoder *encoder = intel_connector->encoder;
 162         struct intel_panel *panel = &intel_connector->panel;
 163
 164         if (dev_priv->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
 165                 return -ENODEV;
 166
 167         if (WARN_ON(encoder->type != INTEL_OUTPUT_DSI))
 168                 return -EINVAL;
 169
 170         panel->backlight.setup = dcs_setup_backlight;
 171         panel->backlight.enable = dcs_enable_backlight;
 172         panel->backlight.disable = dcs_disable_backlight;
 173         panel->backlight.set = dcs_set_backlight;
 174         panel->backlight.get = dcs_get_backlight;
 175
 176         return 0;
 177 }