| 1 | /* | 
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| 2 | * Copyright © 2016 Intel Corporation | 
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| 3 | * | 
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| 4 | * Permission is hereby granted, free of charge, to any person obtaining a | 
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| 5 | * copy of this software and associated documentation files (the "Software"), | 
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| 6 | * to deal in the Software without restriction, including without limitation | 
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| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | 
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| 8 | * and/or sell copies of the Software, and to permit persons to whom the | 
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| 9 | * Software is furnished to do so, subject to the following conditions: | 
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| 10 | * | 
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| 11 | * The above copyright notice and this permission notice (including the next | 
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| 12 | * paragraph) shall be included in all copies or substantial portions of the | 
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| 13 | * Software. | 
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| 14 | * | 
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| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | 
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| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | 
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| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL | 
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| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | 
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| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | 
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| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | 
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| 21 | * DEALINGS IN THE SOFTWARE. | 
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| 22 | * | 
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| 23 | * Author: Deepak M <m.deepak at intel.com> | 
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| 24 | */ | 
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| 25 |  | 
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| 26 | #include <drm/drm_mipi_dsi.h> | 
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| 27 | #include <drm/drm_print.h> | 
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| 28 | #include <video/mipi_display.h> | 
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| 29 |  | 
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| 30 | #include "intel_display_core.h" | 
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| 31 | #include "intel_display_types.h" | 
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| 32 | #include "intel_dsi.h" | 
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| 33 | #include "intel_dsi_dcs_backlight.h" | 
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| 34 |  | 
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| 35 | #define CONTROL_DISPLAY_BCTRL		(1 << 5) | 
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| 36 | #define CONTROL_DISPLAY_DD		(1 << 3) | 
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| 37 | #define CONTROL_DISPLAY_BL		(1 << 2) | 
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| 38 |  | 
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| 39 | #define POWER_SAVE_OFF			(0 << 0) | 
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| 40 | #define POWER_SAVE_LOW			(1 << 0) | 
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| 41 | #define POWER_SAVE_MEDIUM		(2 << 0) | 
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| 42 | #define POWER_SAVE_HIGH			(3 << 0) | 
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| 43 | #define POWER_SAVE_OUTDOOR_MODE		(4 << 0) | 
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| 44 |  | 
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| 45 | #define PANEL_PWM_MAX_VALUE		0xFF | 
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| 46 |  | 
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| 47 | static u32 dcs_get_backlight(struct intel_connector *connector, enum pipe unused) | 
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| 48 | { | 
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| 49 | struct intel_encoder *encoder = intel_attached_encoder(connector); | 
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| 50 | struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder); | 
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| 51 | struct intel_panel *panel = &connector->panel; | 
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| 52 | struct mipi_dsi_device *dsi_device; | 
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| 53 | u8 data[2] = {}; | 
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| 54 | enum port port; | 
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| 55 | size_t len = panel->backlight.max > U8_MAX ? 2 : 1; | 
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| 56 |  | 
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| 57 | for_each_dsi_port(port, panel->vbt.dsi.bl_ports) { | 
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| 58 | dsi_device = intel_dsi->dsi_hosts[port]->device; | 
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| 59 | mipi_dsi_dcs_read(dsi: dsi_device, cmd: MIPI_DCS_GET_DISPLAY_BRIGHTNESS, | 
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| 60 | data: &data, len); | 
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| 61 | break; | 
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| 62 | } | 
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| 63 |  | 
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| 64 | return (data[1] << 8) | data[0]; | 
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| 65 | } | 
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| 66 |  | 
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| 67 | static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level) | 
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| 68 | { | 
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| 69 | struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder)); | 
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| 70 | struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel; | 
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| 71 | struct mipi_dsi_device *dsi_device; | 
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| 72 | u8 data[2] = {}; | 
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| 73 | enum port port; | 
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| 74 | size_t len = panel->backlight.max > U8_MAX ? 2 : 1; | 
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| 75 | unsigned long mode_flags; | 
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| 76 |  | 
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| 77 | if (len == 1) { | 
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| 78 | data[0] = level; | 
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| 79 | } else { | 
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| 80 | data[0] = level >> 8; | 
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| 81 | data[1] = level; | 
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| 82 | } | 
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| 83 |  | 
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| 84 | for_each_dsi_port(port, panel->vbt.dsi.bl_ports) { | 
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| 85 | dsi_device = intel_dsi->dsi_hosts[port]->device; | 
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| 86 | mode_flags = dsi_device->mode_flags; | 
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| 87 | dsi_device->mode_flags &= ~MIPI_DSI_MODE_LPM; | 
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| 88 | mipi_dsi_dcs_write(dsi: dsi_device, cmd: MIPI_DCS_SET_DISPLAY_BRIGHTNESS, | 
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| 89 | data: &data, len); | 
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| 90 | dsi_device->mode_flags = mode_flags; | 
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| 91 | } | 
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| 92 | } | 
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| 93 |  | 
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| 94 | static void dcs_disable_backlight(const struct drm_connector_state *conn_state, u32 level) | 
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| 95 | { | 
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| 96 | struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder)); | 
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| 97 | struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel; | 
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| 98 | struct mipi_dsi_device *dsi_device; | 
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| 99 | enum port port; | 
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| 100 |  | 
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| 101 | dcs_set_backlight(conn_state, level: 0); | 
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| 102 |  | 
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| 103 | for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) { | 
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| 104 | u8 cabc = POWER_SAVE_OFF; | 
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| 105 |  | 
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| 106 | dsi_device = intel_dsi->dsi_hosts[port]->device; | 
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| 107 | mipi_dsi_dcs_write(dsi: dsi_device, cmd: MIPI_DCS_WRITE_POWER_SAVE, | 
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| 108 | data: &cabc, len: sizeof(cabc)); | 
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| 109 | } | 
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| 110 |  | 
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| 111 | for_each_dsi_port(port, panel->vbt.dsi.bl_ports) { | 
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| 112 | u8 ctrl = 0; | 
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| 113 |  | 
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| 114 | dsi_device = intel_dsi->dsi_hosts[port]->device; | 
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| 115 |  | 
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| 116 | mipi_dsi_dcs_read(dsi: dsi_device, cmd: MIPI_DCS_GET_CONTROL_DISPLAY, | 
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| 117 | data: &ctrl, len: sizeof(ctrl)); | 
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| 118 |  | 
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| 119 | ctrl &= ~CONTROL_DISPLAY_BL; | 
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| 120 | ctrl &= ~CONTROL_DISPLAY_DD; | 
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| 121 | ctrl &= ~CONTROL_DISPLAY_BCTRL; | 
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| 122 |  | 
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| 123 | mipi_dsi_dcs_write(dsi: dsi_device, cmd: MIPI_DCS_WRITE_CONTROL_DISPLAY, | 
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| 124 | data: &ctrl, len: sizeof(ctrl)); | 
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| 125 | } | 
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| 126 | } | 
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| 127 |  | 
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| 128 | static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state, | 
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| 129 | const struct drm_connector_state *conn_state, u32 level) | 
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| 130 | { | 
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| 131 | struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder)); | 
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| 132 | struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel; | 
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| 133 | struct mipi_dsi_device *dsi_device; | 
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| 134 | enum port port; | 
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| 135 |  | 
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| 136 | for_each_dsi_port(port, panel->vbt.dsi.bl_ports) { | 
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| 137 | u8 ctrl = 0; | 
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| 138 |  | 
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| 139 | dsi_device = intel_dsi->dsi_hosts[port]->device; | 
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| 140 |  | 
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| 141 | mipi_dsi_dcs_read(dsi: dsi_device, cmd: MIPI_DCS_GET_CONTROL_DISPLAY, | 
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| 142 | data: &ctrl, len: sizeof(ctrl)); | 
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| 143 |  | 
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| 144 | ctrl |= CONTROL_DISPLAY_BL; | 
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| 145 | ctrl |= CONTROL_DISPLAY_DD; | 
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| 146 | ctrl |= CONTROL_DISPLAY_BCTRL; | 
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| 147 |  | 
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| 148 | mipi_dsi_dcs_write(dsi: dsi_device, cmd: MIPI_DCS_WRITE_CONTROL_DISPLAY, | 
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| 149 | data: &ctrl, len: sizeof(ctrl)); | 
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| 150 | } | 
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| 151 |  | 
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| 152 | for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) { | 
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| 153 | u8 cabc = POWER_SAVE_MEDIUM; | 
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| 154 |  | 
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| 155 | dsi_device = intel_dsi->dsi_hosts[port]->device; | 
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| 156 | mipi_dsi_dcs_write(dsi: dsi_device, cmd: MIPI_DCS_WRITE_POWER_SAVE, | 
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| 157 | data: &cabc, len: sizeof(cabc)); | 
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| 158 | } | 
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| 159 |  | 
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| 160 | dcs_set_backlight(conn_state, level); | 
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| 161 | } | 
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| 162 |  | 
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| 163 | static int dcs_setup_backlight(struct intel_connector *connector, | 
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| 164 | enum pipe unused) | 
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| 165 | { | 
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| 166 | struct intel_display *display = to_intel_display(connector); | 
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| 167 | struct intel_panel *panel = &connector->panel; | 
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| 168 |  | 
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| 169 | if (panel->vbt.backlight.brightness_precision_bits > 8) | 
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| 170 | panel->backlight.max = (1 << panel->vbt.backlight.brightness_precision_bits) - 1; | 
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| 171 | else | 
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| 172 | panel->backlight.max = PANEL_PWM_MAX_VALUE; | 
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| 173 |  | 
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| 174 | panel->backlight.level = panel->backlight.max; | 
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| 175 |  | 
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| 176 | drm_dbg_kms(display->drm, | 
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| 177 | "[CONNECTOR:%d:%s] Using DCS for backlight control\n", | 
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| 178 | connector->base.base.id, connector->base.name); | 
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| 179 |  | 
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| 180 | return 0; | 
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| 181 | } | 
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| 182 |  | 
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| 183 | static const struct intel_panel_bl_funcs dcs_bl_funcs = { | 
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| 184 | .setup = dcs_setup_backlight, | 
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| 185 | .enable = dcs_enable_backlight, | 
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| 186 | .disable = dcs_disable_backlight, | 
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| 187 | .set = dcs_set_backlight, | 
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| 188 | .get = dcs_get_backlight, | 
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| 189 | }; | 
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| 190 |  | 
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| 191 | int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector) | 
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| 192 | { | 
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| 193 | struct drm_device *dev = intel_connector->base.dev; | 
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| 194 | struct intel_encoder *encoder = intel_attached_encoder(connector: intel_connector); | 
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| 195 | struct intel_panel *panel = &intel_connector->panel; | 
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| 196 |  | 
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| 197 | if (panel->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS) | 
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| 198 | return -ENODEV; | 
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| 199 |  | 
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| 200 | if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI)) | 
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| 201 | return -EINVAL; | 
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| 202 |  | 
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| 203 | panel->backlight.funcs = &dcs_bl_funcs; | 
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| 204 |  | 
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| 205 | return 0; | 
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| 206 | } | 
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| 207 |  | 
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