i915/display/intel_dsi_dcs_backlight.c

0001 /*
0002  * Copyright © 2016 Intel Corporation
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice (including the next
0012  * paragraph) shall be included in all copies or substantial portions of the
0013  * Software.
0014  *
0015  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0016  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0017  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0018  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
0019  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
0020  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
0021  * DEALINGS IN THE SOFTWARE.
0022  *
0023  * Author: Deepak M <m.deepak at intel.com>
0024  */
0025
0026 #include <drm/drm_mipi_dsi.h>
0027 #include <video/mipi_display.h>
0028
0029 #include "i915_drv.h"
0030 #include "intel_display_types.h"
0031 #include "intel_dsi.h"
0032 #include "intel_dsi_dcs_backlight.h"
0033
0034 #define CONTROL_DISPLAY_BCTRL       (1 << 5)
0035 #define CONTROL_DISPLAY_DD      (1 << 3)
0036 #define CONTROL_DISPLAY_BL      (1 << 2)
0037
0038 #define POWER_SAVE_OFF          (0 << 0)
0039 #define POWER_SAVE_LOW          (1 << 0)
0040 #define POWER_SAVE_MEDIUM       (2 << 0)
0041 #define POWER_SAVE_HIGH         (3 << 0)
0042 #define POWER_SAVE_OUTDOOR_MODE     (4 << 0)
0043
0044 #define PANEL_PWM_MAX_VALUE     0xFF
0045
0046 static u32 dcs_get_backlight(struct intel_connector *connector, enum pipe unused)
0047 {
0048     struct intel_encoder *encoder = intel_attached_encoder(connector);
0049     struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
0050     struct intel_panel *panel = &connector->panel;
0051     struct mipi_dsi_device *dsi_device;
0052     u8 data[2] = {};
0053     enum port port;
0054     size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
0055
0056     for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
0057         dsi_device = intel_dsi->dsi_hosts[port]->device;
0058         mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
0059                   &data, len);
0060         break;
0061     }
0062
0063     return (data[1] << 8) | data[0];
0064 }
0065
0066 static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level)
0067 {
0068     struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
0069     struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
0070     struct mipi_dsi_device *dsi_device;
0071     u8 data[2] = {};
0072     enum port port;
0073     size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
0074     unsigned long mode_flags;
0075
0076     if (len == 1) {
0077         data[0] = level;
0078     } else {
0079         data[0] = level >> 8;
0080         data[1] = level;
0081     }
0082
0083     for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
0084         dsi_device = intel_dsi->dsi_hosts[port]->device;
0085         mode_flags = dsi_device->mode_flags;
0086         dsi_device->mode_flags &= ~MIPI_DSI_MODE_LPM;
0087         mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
0088                    &data, len);
0089         dsi_device->mode_flags = mode_flags;
0090     }
0091 }
0092
0093 static void dcs_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
0094 {
0095     struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
0096     struct mipi_dsi_device *dsi_device;
0097     enum port port;
0098
0099     dcs_set_backlight(conn_state, 0);
0100
0101     for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
0102         u8 cabc = POWER_SAVE_OFF;
0103
0104         dsi_device = intel_dsi->dsi_hosts[port]->device;
0105         mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
0106                    &cabc, sizeof(cabc));
0107     }
0108
0109     for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
0110         u8 ctrl = 0;
0111
0112         dsi_device = intel_dsi->dsi_hosts[port]->device;
0113
0114         mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
0115                   &ctrl, sizeof(ctrl));
0116
0117         ctrl &= ~CONTROL_DISPLAY_BL;
0118         ctrl &= ~CONTROL_DISPLAY_DD;
0119         ctrl &= ~CONTROL_DISPLAY_BCTRL;
0120
0121         mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
0122                    &ctrl, sizeof(ctrl));
0123     }
0124 }
0125
0126 static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
0127                  const struct drm_connector_state *conn_state, u32 level)
0128 {
0129     struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
0130     struct mipi_dsi_device *dsi_device;
0131     enum port port;
0132
0133     for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
0134         u8 ctrl = 0;
0135
0136         dsi_device = intel_dsi->dsi_hosts[port]->device;
0137
0138         mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
0139                   &ctrl, sizeof(ctrl));
0140
0141         ctrl |= CONTROL_DISPLAY_BL;
0142         ctrl |= CONTROL_DISPLAY_DD;
0143         ctrl |= CONTROL_DISPLAY_BCTRL;
0144
0145         mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
0146                    &ctrl, sizeof(ctrl));
0147     }
0148
0149     for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
0150         u8 cabc = POWER_SAVE_MEDIUM;
0151
0152         dsi_device = intel_dsi->dsi_hosts[port]->device;
0153         mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
0154                    &cabc, sizeof(cabc));
0155     }
0156
0157     dcs_set_backlight(conn_state, level);
0158 }
0159
0160 static int dcs_setup_backlight(struct intel_connector *connector,
0161                    enum pipe unused)
0162 {
0163     struct intel_panel *panel = &connector->panel;
0164
0165     if (panel->vbt.backlight.brightness_precision_bits > 8)
0166         panel->backlight.max = (1 << panel->vbt.backlight.brightness_precision_bits) - 1;
0167     else
0168         panel->backlight.max = PANEL_PWM_MAX_VALUE;
0169
0170     panel->backlight.level = panel->backlight.max;
0171
0172     return 0;
0173 }
0174
0175 static const struct intel_panel_bl_funcs dcs_bl_funcs = {
0176     .setup = dcs_setup_backlight,
0177     .enable = dcs_enable_backlight,
0178     .disable = dcs_disable_backlight,
0179     .set = dcs_set_backlight,
0180     .get = dcs_get_backlight,
0181 };
0182
0183 int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
0184 {
0185     struct drm_device *dev = intel_connector->base.dev;
0186     struct intel_encoder *encoder = intel_attached_encoder(intel_connector);
0187     struct intel_panel *panel = &intel_connector->panel;
0188
0189     if (panel->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
0190         return -ENODEV;
0191
0192     if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI))
0193         return -EINVAL;
0194
0195     panel->backlight.funcs = &dcs_bl_funcs;
0196
0197     return 0;
0198 }