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 "intel_drv.h"
 27#include "intel_dsi.h"
 28#include "i915_drv.h"
 29#include <video/mipi_display.h>
 30#include <drm/drm_mipi_dsi.h>
 31
 32#define CONTROL_DISPLAY_BCTRL		(1 << 5)
 33#define CONTROL_DISPLAY_DD		(1 << 3)
 34#define CONTROL_DISPLAY_BL		(1 << 2)
 35
 36#define POWER_SAVE_OFF			(0 << 0)
 37#define POWER_SAVE_LOW			(1 << 0)
 38#define POWER_SAVE_MEDIUM		(2 << 0)
 39#define POWER_SAVE_HIGH			(3 << 0)
 40#define POWER_SAVE_OUTDOOR_MODE		(4 << 0)
 41
 42#define PANEL_PWM_MAX_VALUE		0xFF
 43
 44static u32 dcs_get_backlight(struct intel_connector *connector)
 45{
 46	struct intel_encoder *encoder = connector->encoder;
 47	struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 48	struct mipi_dsi_device *dsi_device;
 49	u8 data = 0;
 50	enum port port;
 51
 52	/* FIXME: Need to take care of 16 bit brightness level */
 53	for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
 54		dsi_device = intel_dsi->dsi_hosts[port]->device;
 55		mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
 56				  &data, sizeof(data));
 57		break;
 58	}
 59
 60	return data;
 61}
 62
 63static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level)
 64{
 65	struct intel_dsi *intel_dsi = enc_to_intel_dsi(conn_state->best_encoder);
 66	struct mipi_dsi_device *dsi_device;
 67	u8 data = level;
 68	enum port port;
 69
 70	/* FIXME: Need to take care of 16 bit brightness level */
 71	for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
 72		dsi_device = intel_dsi->dsi_hosts[port]->device;
 73		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
 74				   &data, sizeof(data));
 75	}
 76}
 77
 78static void dcs_disable_backlight(const struct drm_connector_state *conn_state)
 79{
 80	struct intel_dsi *intel_dsi = enc_to_intel_dsi(conn_state->best_encoder);
 81	struct mipi_dsi_device *dsi_device;
 82	enum port port;
 83
 84	dcs_set_backlight(conn_state, 0);
 85
 86	for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
 87		u8 cabc = POWER_SAVE_OFF;
 88
 89		dsi_device = intel_dsi->dsi_hosts[port]->device;
 90		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
 91				   &cabc, sizeof(cabc));
 92	}
 93
 94	for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
 95		u8 ctrl = 0;
 96
 97		dsi_device = intel_dsi->dsi_hosts[port]->device;
 98
 99		mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
100				  &ctrl, sizeof(ctrl));
101
102		ctrl &= ~CONTROL_DISPLAY_BL;
103		ctrl &= ~CONTROL_DISPLAY_DD;
104		ctrl &= ~CONTROL_DISPLAY_BCTRL;
105
106		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
107				   &ctrl, sizeof(ctrl));
108	}
109}
110
111static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
112				 const struct drm_connector_state *conn_state)
113{
114	struct intel_dsi *intel_dsi = enc_to_intel_dsi(conn_state->best_encoder);
115	struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
116	struct mipi_dsi_device *dsi_device;
117	enum port port;
118
119	for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) {
120		u8 ctrl = 0;
121
122		dsi_device = intel_dsi->dsi_hosts[port]->device;
123
124		mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
125				  &ctrl, sizeof(ctrl));
126
127		ctrl |= CONTROL_DISPLAY_BL;
128		ctrl |= CONTROL_DISPLAY_DD;
129		ctrl |= CONTROL_DISPLAY_BCTRL;
130
131		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
132				   &ctrl, sizeof(ctrl));
133	}
134
135	for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) {
136		u8 cabc = POWER_SAVE_MEDIUM;
137
138		dsi_device = intel_dsi->dsi_hosts[port]->device;
139		mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
140				   &cabc, sizeof(cabc));
141	}
142
143	dcs_set_backlight(conn_state, panel->backlight.level);
144}
145
146static int dcs_setup_backlight(struct intel_connector *connector,
147			       enum pipe unused)
148{
149	struct intel_panel *panel = &connector->panel;
150
151	panel->backlight.max = PANEL_PWM_MAX_VALUE;
152	panel->backlight.level = PANEL_PWM_MAX_VALUE;
153
154	return 0;
155}
156
157int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
158{
159	struct drm_device *dev = intel_connector->base.dev;
160	struct drm_i915_private *dev_priv = to_i915(dev);
161	struct intel_encoder *encoder = intel_connector->encoder;
162	struct intel_panel *panel = &intel_connector->panel;
163
164	if (dev_priv->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
165		return -ENODEV;
166
167	if (WARN_ON(encoder->type != INTEL_OUTPUT_DSI))
168		return -EINVAL;
169
170	panel->backlight.setup = dcs_setup_backlight;
171	panel->backlight.enable = dcs_enable_backlight;
172	panel->backlight.disable = dcs_disable_backlight;
173	panel->backlight.set = dcs_set_backlight;
174	panel->backlight.get = dcs_get_backlight;
175
176	return 0;
177}