/*
* Copyright © 2016 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Author: Deepak M <m.deepak at intel.com>
*/
#include <drm/drm_mipi_dsi.h>
#include <video/mipi_display.h>
#include "i915_drv.h"
#include "intel_display_types.h"
#include "intel_dsi.h"
#include "intel_dsi_dcs_backlight.h"
#define CONTROL_DISPLAY_BCTRL (1 << 5)
#define CONTROL_DISPLAY_DD (1 << 3)
#define CONTROL_DISPLAY_BL (1 << 2)
#define POWER_SAVE_OFF (0 << 0)
#define POWER_SAVE_LOW (1 << 0)
#define POWER_SAVE_MEDIUM (2 << 0)
#define POWER_SAVE_HIGH (3 << 0)
#define POWER_SAVE_OUTDOOR_MODE (4 << 0)
#define PANEL_PWM_MAX_VALUE 0xFF
static u32 dcs_get_backlight(struct intel_connector *connector, enum pipe unused)
{
struct intel_encoder *encoder = intel_attached_encoder(connector);
struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
struct intel_panel *panel = &connector->panel;
struct mipi_dsi_device *dsi_device;
u8 data[2] = {};
enum port port;
size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
dsi_device = intel_dsi->dsi_hosts[port]->device;
mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_DISPLAY_BRIGHTNESS,
&data, len);
break;
}
return (data[1] << 8) | data[0];
}
static void dcs_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
struct mipi_dsi_device *dsi_device;
u8 data[2] = {};
enum port port;
size_t len = panel->backlight.max > U8_MAX ? 2 : 1;
unsigned long mode_flags;
if (len == 1) {
data[0] = level;
} else {
data[0] = level >> 8;
data[1] = level;
}
for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
dsi_device = intel_dsi->dsi_hosts[port]->device;
mode_flags = dsi_device->mode_flags;
dsi_device->mode_flags &= ~MIPI_DSI_MODE_LPM;
mipi_dsi_dcs_write(dsi_device, MIPI_DCS_SET_DISPLAY_BRIGHTNESS,
&data, len);
dsi_device->mode_flags = mode_flags;
}
}
static void dcs_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
struct mipi_dsi_device *dsi_device;
enum port port;
dcs_set_backlight(conn_state, 0);
for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) {
u8 cabc = POWER_SAVE_OFF;
dsi_device = intel_dsi->dsi_hosts[port]->device;
mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
&cabc, sizeof(cabc));
}
for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
u8 ctrl = 0;
dsi_device = intel_dsi->dsi_hosts[port]->device;
mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
&ctrl, sizeof(ctrl));
ctrl &= ~CONTROL_DISPLAY_BL;
ctrl &= ~CONTROL_DISPLAY_DD;
ctrl &= ~CONTROL_DISPLAY_BCTRL;
mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
&ctrl, sizeof(ctrl));
}
}
static void dcs_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(conn_state->best_encoder));
struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
struct mipi_dsi_device *dsi_device;
enum port port;
for_each_dsi_port(port, panel->vbt.dsi.bl_ports) {
u8 ctrl = 0;
dsi_device = intel_dsi->dsi_hosts[port]->device;
mipi_dsi_dcs_read(dsi_device, MIPI_DCS_GET_CONTROL_DISPLAY,
&ctrl, sizeof(ctrl));
ctrl |= CONTROL_DISPLAY_BL;
ctrl |= CONTROL_DISPLAY_DD;
ctrl |= CONTROL_DISPLAY_BCTRL;
mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_CONTROL_DISPLAY,
&ctrl, sizeof(ctrl));
}
for_each_dsi_port(port, panel->vbt.dsi.cabc_ports) {
u8 cabc = POWER_SAVE_MEDIUM;
dsi_device = intel_dsi->dsi_hosts[port]->device;
mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE,
&cabc, sizeof(cabc));
}
dcs_set_backlight(conn_state, level);
}
static int dcs_setup_backlight(struct intel_connector *connector,
enum pipe unused)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
if (panel->vbt.backlight.brightness_precision_bits > 8)
panel->backlight.max = (1 << panel->vbt.backlight.brightness_precision_bits) - 1;
else
panel->backlight.max = PANEL_PWM_MAX_VALUE;
panel->backlight.level = panel->backlight.max;
drm_dbg_kms(&i915->drm,
"[CONNECTOR:%d:%s] Using DCS for backlight control\n",
connector->base.base.id, connector->base.name);
return 0;
}
static const struct intel_panel_bl_funcs dcs_bl_funcs = {
.setup = dcs_setup_backlight,
.enable = dcs_enable_backlight,
.disable = dcs_disable_backlight,
.set = dcs_set_backlight,
.get = dcs_get_backlight,
};
int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector)
{
struct drm_device *dev = intel_connector->base.dev;
struct intel_encoder *encoder = intel_attached_encoder(intel_connector);
struct intel_panel *panel = &intel_connector->panel;
if (panel->vbt.backlight.type != INTEL_BACKLIGHT_DSI_DCS)
return -ENODEV;
if (drm_WARN_ON(dev, encoder->type != INTEL_OUTPUT_DSI))
return -EINVAL;
panel->backlight.funcs = &dcs_bl_funcs;
return 0;
}
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