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
 46static 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 intel_panel *panel = &connector->panel;
 51	struct mipi_dsi_device *dsi_device;
 52	u8 data[2] = {};
 53	enum port port;
 54	size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
 55
 56	for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
 57		dsi_device = intel_dsi->dsi_hosts[port]->device;
 58		mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
 59				  &data, len);
 60		break;
 61	}
 62
 63	return (data[1] << 8) | data[0];
 64}
 65
 66static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 67{
 68	struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
 69	struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 70	struct mipi_dsi_device *dsi_device;
 71	u8 data[2] = {};
 72	enum port port;
 73	size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
 74	unsigned long mode_flags;
 75
 76	if (len == 1) {
 77		data[0] = level;
 78	} else {
 79		data[0] = level >> 8;
 80		data[1] = level;
 81	}
 82
 83	for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
 84		dsi_device = intel_dsi->dsi_hosts[port]->device;
 85		mode_flags = dsi_device->mode_flags;
 86		dsi_device->mode_flags &= ~MIPI_DSI_MODE_LPM;
 87		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
 88				   &data, len);
 89		dsi_device->mode_flags = mode_flags;
 90	}
 91}
 92
 93static void dcs_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
 94{
 95	struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
 96	struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 97	struct mipi_dsi_device *dsi_device;
 98	enum port port;
 99
100	dcs_set_backlight(conn_state, 0);
101
102	for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) {
103		u8 cabc = POWER_SAVE_OFF;
104
105		dsi_device = intel_dsi->dsi_hosts[port]->device;
106		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
107				   &cabc, sizeof(cabc));
108	}
109
110	for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
111		u8 ctrl = 0;
112
113		dsi_device = intel_dsi->dsi_hosts[port]->device;
114
115		mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
116				  &ctrl, sizeof(ctrl));
117
118		ctrl &= ~CONTROL_DISPLAY_BL;
119		ctrl &= ~CONTROL_DISPLAY_DD;
120		ctrl &= ~CONTROL_DISPLAY_BCTRL;
121
122		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
123				   &ctrl, sizeof(ctrl));
124	}
125}
126
127static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
128				 const struct drm_connector_state *conn_state, u32 level)
129{
130	struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
131	struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
132	struct mipi_dsi_device *dsi_device;
133	enum port port;
134
135	for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
136		u8 ctrl = 0;
137
138		dsi_device = intel_dsi->dsi_hosts[port]->device;
139
140		mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
141				  &ctrl, sizeof(ctrl));
142
143		ctrl |= CONTROL_DISPLAY_BL;
144		ctrl |= CONTROL_DISPLAY_DD;
145		ctrl |= CONTROL_DISPLAY_BCTRL;
146
147		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
148				   &ctrl, sizeof(ctrl));
149	}
150
151	for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) {
152		u8 cabc = POWER_SAVE_MEDIUM;
153
154		dsi_device = intel_dsi->dsi_hosts[port]->device;
155		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
156				   &cabc, sizeof(cabc));
157	}
158
159	dcs_set_backlight(conn_state, level);
160}
161
162static int dcs_setup_backlight(struct intel_connector *connector,
163			       enum pipe unused)
164{
165	struct intel_panel *panel = &connector->panel;
166
167	if (panel->vbt.backlight.brightness_precision_bits > 8)
168		panel->backlight.max = (1 << panel->vbt.backlight.brightness_precision_bits) - 1;
169	else
170		panel->backlight.max = PANEL_PWM_MAX_VALUE;
171
172	panel->backlight.level = panel->backlight.max;
173
174	return 0;
175}
176
177static const struct intel_panel_bl_funcs dcs_bl_funcs = {
178	.setup = dcs_setup_backlight,
179	.enable = dcs_enable_backlight,
180	.disable = dcs_disable_backlight,
181	.set = dcs_set_backlight,
182	.get = dcs_get_backlight,
183};
184
185int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
186{
187	struct drm_device *dev = intel_connector->base.dev;
188	struct intel_encoder *encoder = intel_attached_encoder(intel_connector);
189	struct intel_panel *panel = &intel_connector->panel;
190
191	if (panel->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
192		return -ENODEV;
193
194	if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI))
195		return -EINVAL;
196
197	panel->backlight.funcs = &dcs_bl_funcs;
198
199	return 0;
200}