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 <drm/drm_mipi_dsi.h>
 27#include <drm/drm_print.h>
 28#include <video/mipi_display.h>
 29
 30#include "intel_display_core.h"
 31#include "intel_display_types.h"
 32#include "intel_dsi.h"
 33#include "intel_dsi_dcs_backlight.h"
 34
 35#define CONTROL_DISPLAY_BCTRL		(1 << 5)
 36#define CONTROL_DISPLAY_DD		(1 << 3)
 37#define CONTROL_DISPLAY_BL		(1 << 2)
 38
 39#define POWER_SAVE_OFF			(0 << 0)
 40#define POWER_SAVE_LOW			(1 << 0)
 41#define POWER_SAVE_MEDIUM		(2 << 0)
 42#define POWER_SAVE_HIGH			(3 << 0)
 43#define POWER_SAVE_OUTDOOR_MODE		(4 << 0)
 44
 45#define PANEL_PWM_MAX_VALUE		0xFF
 46
 47static u32 dcs_get_backlight(struct intel_connector *connector, enum pipe unused)
 48{
 49	struct intel_encoder *encoder = intel_attached_encoder(connector);
 50	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 51	struct intel_panel *panel = &connector->panel;
 52	struct mipi_dsi_device *dsi_device;
 53	u8 data[2] = {};
 54	enum port port;
 55	size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
 56
 57	for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
 58		dsi_device = intel_dsi->dsi_hosts[port]->device;
 59		mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
 60				  &data, len);
 61		break;
 62	}
 63
 64	return (data[1] << 8) | data[0];
 65}
 66
 67static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 68{
 69	struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
 70	struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 71	struct mipi_dsi_device *dsi_device;
 72	u8 data[2] = {};
 73	enum port port;
 74	size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
 75	unsigned long mode_flags;
 76
 77	if (len == 1) {
 78		data[0] = level;
 79	} else {
 80		data[0] = level >> 8;
 81		data[1] = level;
 82	}
 83
 84	for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
 85		dsi_device = intel_dsi->dsi_hosts[port]->device;
 86		mode_flags = dsi_device->mode_flags;
 87		dsi_device->mode_flags &= ~MIPI_DSI_MODE_LPM;
 88		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
 89				   &data, len);
 90		dsi_device->mode_flags = mode_flags;
 91	}
 92}
 93
 94static void dcs_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
 95{
 96	struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
 97	struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
 98	struct mipi_dsi_device *dsi_device;
 99	enum port port;
100
101	dcs_set_backlight(conn_state, 0);
102
103	for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) {
104		u8 cabc = POWER_SAVE_OFF;
105
106		dsi_device = intel_dsi->dsi_hosts[port]->device;
107		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
108				   &cabc, sizeof(cabc));
109	}
110
111	for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
112		u8 ctrl = 0;
113
114		dsi_device = intel_dsi->dsi_hosts[port]->device;
115
116		mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
117				  &ctrl, sizeof(ctrl));
118
119		ctrl &= ~CONTROL_DISPLAY_BL;
120		ctrl &= ~CONTROL_DISPLAY_DD;
121		ctrl &= ~CONTROL_DISPLAY_BCTRL;
122
123		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
124				   &ctrl, sizeof(ctrl));
125	}
126}
127
128static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
129				 const struct drm_connector_state *conn_state, u32 level)
130{
131	struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
132	struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
133	struct mipi_dsi_device *dsi_device;
134	enum port port;
135
136	for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
137		u8 ctrl = 0;
138
139		dsi_device = intel_dsi->dsi_hosts[port]->device;
140
141		mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
142				  &ctrl, sizeof(ctrl));
143
144		ctrl |= CONTROL_DISPLAY_BL;
145		ctrl |= CONTROL_DISPLAY_DD;
146		ctrl |= CONTROL_DISPLAY_BCTRL;
147
148		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
149				   &ctrl, sizeof(ctrl));
150	}
151
152	for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) {
153		u8 cabc = POWER_SAVE_MEDIUM;
154
155		dsi_device = intel_dsi->dsi_hosts[port]->device;
156		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
157				   &cabc, sizeof(cabc));
158	}
159
160	dcs_set_backlight(conn_state, level);
161}
162
163static int dcs_setup_backlight(struct intel_connector *connector,
164			       enum pipe unused)
165{
166	struct intel_display *display = to_intel_display(connector);
167	struct intel_panel *panel = &connector->panel;
168
169	if (panel->vbt.backlight.brightness_precision_bits > 8)
170		panel->backlight.max = (1 << panel->vbt.backlight.brightness_precision_bits) - 1;
171	else
172		panel->backlight.max = PANEL_PWM_MAX_VALUE;
173
174	panel->backlight.level = panel->backlight.max;
175
176	drm_dbg_kms(display->drm,
177		    "[CONNECTOR:%d:%s] Using DCS for backlight control\n",
178		    connector->base.base.id, connector->base.name);
179
180	return 0;
181}
182
183static const struct intel_panel_bl_funcs dcs_bl_funcs = {
184	.setup = dcs_setup_backlight,
185	.enable = dcs_enable_backlight,
186	.disable = dcs_disable_backlight,
187	.set = dcs_set_backlight,
188	.get = dcs_get_backlight,
189};
190
191int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
192{
193	struct drm_device *dev = intel_connector->base.dev;
194	struct intel_encoder *encoder = intel_attached_encoder(intel_connector);
195	struct intel_panel *panel = &intel_connector->panel;
196
197	if (panel->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
198		return -ENODEV;
199
200	if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI))
201		return -EINVAL;
202
203	panel->backlight.funcs = &dcs_bl_funcs;
204
205	return 0;
206}