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

DEFINITIONS

1. dcs_get_backlight
2. dcs_set_backlight
3. dcs_disable_backlight
4. dcs_enable_backlight
5. dcs_setup_backlight
6. intel_dsi_dcs_init_backlight_funcs

   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)
  47 {
  48         struct intel_encoder *encoder = connector->encoder;
  49         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
  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(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)
  81 {
  82         struct intel_dsi *intel_dsi = enc_to_intel_dsi(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)
 115 {
 116         struct intel_dsi *intel_dsi = enc_to_intel_dsi(conn_state->best_encoder);
 117         struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 118         struct mipi_dsi_device *dsi_device;
 119         enum port port;
 120 
 121         for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
 122                 u8 ctrl = 0;
 123 
 124                 dsi_device = intel_dsi->dsi_hosts[port]->device;
 125 
 126                 mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
 127                                   &ctrl, sizeof(ctrl));
 128 
 129                 ctrl |= CONTROL_DISPLAY_BL;
 130                 ctrl |= CONTROL_DISPLAY_DD;
 131                 ctrl |= CONTROL_DISPLAY_BCTRL;
 132 
 133                 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
 134                                    &ctrl, sizeof(ctrl));
 135         }
 136 
 137         for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
 138                 u8 cabc = POWER_SAVE_MEDIUM;
 139 
 140                 dsi_device = intel_dsi->dsi_hosts[port]->device;
 141                 mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
 142                                    &cabc, sizeof(cabc));
 143         }
 144 
 145         dcs_set_backlight(conn_state, panel->backlight.level);
 146 }
 147 
 148 static int dcs_setup_backlight(struct intel_connector *connector,
 149                                enum pipe unused)
 150 {
 151         struct intel_panel *panel = &connector->panel;
 152 
 153         panel->backlight.max = PANEL_PWM_MAX_VALUE;
 154         panel->backlight.level = PANEL_PWM_MAX_VALUE;
 155 
 156         return 0;
 157 }
 158 
 159 int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
 160 {
 161         struct drm_device *dev = intel_connector->base.dev;
 162         struct drm_i915_private *dev_priv = to_i915(dev);
 163         struct intel_encoder *encoder = intel_connector->encoder;
 164         struct intel_panel *panel = &intel_connector->panel;
 165 
 166         if (dev_priv->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
 167                 return -ENODEV;
 168 
 169         if (WARN_ON(encoder->type != INTEL_OUTPUT_DSI))
 170                 return -EINVAL;
 171 
 172         panel->backlight.setup = dcs_setup_backlight;
 173         panel->backlight.enable = dcs_enable_backlight;
 174         panel->backlight.disable = dcs_disable_backlight;
 175         panel->backlight.set = dcs_set_backlight;
 176         panel->backlight.get = dcs_get_backlight;
 177 
 178         return 0;
 179 }