// SPDX-License-Identifier: MIT
/*
* Copyright © 2021 Intel Corporation
*/
#include <linux/backlight.h>
#include <linux/kernel.h>
#include <linux/pwm.h>
#include <linux/string_helpers.h>
#include <acpi/video.h>
#include "i915_reg.h"
#include "intel_backlight.h"
#include "intel_backlight_regs.h"
#include "intel_connector.h"
#include "intel_de.h"
#include "intel_display_types.h"
#include "intel_dp_aux_backlight.h"
#include "intel_dsi_dcs_backlight.h"
#include "intel_panel.h"
#include "intel_pci_config.h"
#include "intel_pps.h"
#include "intel_quirks.h"
/**
* scale - scale values from one range to another
* @source_val: value in range [@source_min..@source_max]
* @source_min: minimum legal value for @source_val
* @source_max: maximum legal value for @source_val
* @target_min: corresponding target value for @source_min
* @target_max: corresponding target value for @source_max
*
* Return @source_val in range [@source_min..@source_max] scaled to range
* [@target_min..@target_max].
*/
static u32 scale(u32 source_val,
u32 source_min, u32 source_max,
u32 target_min, u32 target_max)
{
u64 target_val;
WARN_ON(source_min > source_max);
WARN_ON(target_min > target_max);
/* defensive */
source_val = clamp(source_val, source_min, source_max);
/* avoid overflows */
target_val = mul_u32_u32(source_val - source_min,
target_max - target_min);
target_val = DIV_ROUND_CLOSEST_ULL(target_val, source_max - source_min);
target_val += target_min;
return target_val;
}
/*
* Scale user_level in range [0..user_max] to [0..hw_max], clamping the result
* to [hw_min..hw_max].
*/
static u32 clamp_user_to_hw(struct intel_connector *connector,
u32 user_level, u32 user_max)
{
struct intel_panel *panel = &connector->panel;
u32 hw_level;
hw_level = scale(user_level, 0, user_max, 0, panel->backlight.max);
hw_level = clamp(hw_level, panel->backlight.min, panel->backlight.max);
return hw_level;
}
/* Scale hw_level in range [hw_min..hw_max] to [0..user_max]. */
static u32 scale_hw_to_user(struct intel_connector *connector,
u32 hw_level, u32 user_max)
{
struct intel_panel *panel = &connector->panel;
return scale(hw_level, panel->backlight.min, panel->backlight.max,
0, user_max);
}
u32 intel_backlight_invert_pwm_level(struct intel_connector *connector, u32 val)
{
struct intel_display *display = to_intel_display(connector);
struct intel_panel *panel = &connector->panel;
drm_WARN_ON(display->drm, panel->backlight.pwm_level_max == 0);
if (display->params.invert_brightness < 0)
return val;
if (display->params.invert_brightness > 0 ||
intel_has_quirk(display, QUIRK_INVERT_BRIGHTNESS)) {
return panel->backlight.pwm_level_max - val + panel->backlight.pwm_level_min;
}
return val;
}
void intel_backlight_set_pwm_level(const struct drm_connector_state *conn_state, u32 val)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] set backlight PWM = %d\n",
connector->base.base.id, connector->base.name, val);
panel->backlight.pwm_funcs->set(conn_state, val);
}
u32 intel_backlight_level_to_pwm(struct intel_connector *connector, u32 val)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
drm_WARN_ON_ONCE(&i915->drm,
panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
val = scale(val, panel->backlight.min, panel->backlight.max,
panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
return intel_backlight_invert_pwm_level(connector, val);
}
u32 intel_backlight_level_from_pwm(struct intel_connector *connector, u32 val)
{
struct intel_display *display = to_intel_display(connector);
struct intel_panel *panel = &connector->panel;
drm_WARN_ON_ONCE(display->drm,
panel->backlight.max == 0 || panel->backlight.pwm_level_max == 0);
if (display->params.invert_brightness > 0 ||
(display->params.invert_brightness == 0 &&
intel_has_quirk(display, QUIRK_INVERT_BRIGHTNESS)))
val = panel->backlight.pwm_level_max - (val - panel->backlight.pwm_level_min);
return scale(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max,
panel->backlight.min, panel->backlight.max);
}
static u32 lpt_get_backlight(struct intel_connector *connector, enum pipe unused)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
return intel_de_read(i915, BLC_PWM_PCH_CTL2) & BACKLIGHT_DUTY_CYCLE_MASK;
}
static u32 pch_get_backlight(struct intel_connector *connector, enum pipe unused)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
return intel_de_read(i915, BLC_PWM_CPU_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
}
static u32 i9xx_get_backlight(struct intel_connector *connector, enum pipe unused)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 val;
val = intel_de_read(i915, BLC_PWM_CTL) & BACKLIGHT_DUTY_CYCLE_MASK;
if (DISPLAY_VER(i915) < 4)
val >>= 1;
if (panel->backlight.combination_mode) {
u8 lbpc;
pci_read_config_byte(to_pci_dev(i915->drm.dev), LBPC, &lbpc);
val *= lbpc;
}
return val;
}
static u32 vlv_get_backlight(struct intel_connector *connector, enum pipe pipe)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
if (drm_WARN_ON(&i915->drm, pipe != PIPE_A && pipe != PIPE_B))
return 0;
return intel_de_read(i915, VLV_BLC_PWM_CTL(pipe)) & BACKLIGHT_DUTY_CYCLE_MASK;
}
static u32 bxt_get_backlight(struct intel_connector *connector, enum pipe unused)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
return intel_de_read(i915, BXT_BLC_PWM_DUTY(panel->backlight.controller));
}
static u32 ext_pwm_get_backlight(struct intel_connector *connector, enum pipe unused)
{
struct intel_panel *panel = &connector->panel;
struct pwm_state state;
pwm_get_state(panel->backlight.pwm, &state);
return pwm_get_relative_duty_cycle(&state, 100);
}
static void lpt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
u32 val;
val = intel_de_read(i915, BLC_PWM_PCH_CTL2) & ~BACKLIGHT_DUTY_CYCLE_MASK;
intel_de_write(i915, BLC_PWM_PCH_CTL2, val | level);
}
static void pch_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
u32 tmp;
tmp = intel_de_read(i915, BLC_PWM_CPU_CTL) & ~BACKLIGHT_DUTY_CYCLE_MASK;
intel_de_write(i915, BLC_PWM_CPU_CTL, tmp | level);
}
static void i9xx_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 tmp, mask;
drm_WARN_ON(&i915->drm, panel->backlight.pwm_level_max == 0);
if (panel->backlight.combination_mode) {
u8 lbpc;
lbpc = level * 0xfe / panel->backlight.pwm_level_max + 1;
level /= lbpc;
pci_write_config_byte(to_pci_dev(i915->drm.dev), LBPC, lbpc);
}
if (DISPLAY_VER(i915) == 4) {
mask = BACKLIGHT_DUTY_CYCLE_MASK;
} else {
level <<= 1;
mask = BACKLIGHT_DUTY_CYCLE_MASK_PNV;
}
tmp = intel_de_read(i915, BLC_PWM_CTL) & ~mask;
intel_de_write(i915, BLC_PWM_CTL, tmp | level);
}
static void vlv_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
u32 tmp;
tmp = intel_de_read(i915, VLV_BLC_PWM_CTL(pipe)) & ~BACKLIGHT_DUTY_CYCLE_MASK;
intel_de_write(i915, VLV_BLC_PWM_CTL(pipe), tmp | level);
}
static void bxt_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
intel_de_write(i915, BXT_BLC_PWM_DUTY(panel->backlight.controller), level);
}
static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel;
pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);
}
static void
intel_panel_actually_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] set backlight level = %d\n",
connector->base.base.id, connector->base.name, level);
panel->backlight.funcs->set(conn_state, level);
}
/* set backlight brightness to level in range [0..max], assuming hw min is
* respected.
*/
void intel_backlight_set_acpi(const struct drm_connector_state *conn_state,
u32 user_level, u32 user_max)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 hw_level;
/*
* Lack of crtc may occur during driver init because
* connection_mutex isn't held across the entire backlight
* setup + modeset readout, and the BIOS can issue the
* requests at any time.
*/
if (!panel->backlight.present || !conn_state->crtc)
return;
mutex_lock(&i915->display.backlight.lock);
drm_WARN_ON(&i915->drm, panel->backlight.max == 0);
hw_level = clamp_user_to_hw(connector, user_level, user_max);
panel->backlight.level = hw_level;
if (panel->backlight.device)
panel->backlight.device->props.brightness =
scale_hw_to_user(connector,
panel->backlight.level,
panel->backlight.device->props.max_brightness);
if (panel->backlight.enabled)
intel_panel_actually_set_backlight(conn_state, hw_level);
mutex_unlock(&i915->display.backlight.lock);
}
static void lpt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
u32 tmp;
intel_backlight_set_pwm_level(old_conn_state, level);
/*
* Although we don't support or enable CPU PWM with LPT/SPT based
* systems, it may have been enabled prior to loading the
* driver. Disable to avoid warnings on LCPLL disable.
*
* This needs rework if we need to add support for CPU PWM on PCH split
* platforms.
*/
tmp = intel_de_read(i915, BLC_PWM_CPU_CTL2);
if (tmp & BLM_PWM_ENABLE) {
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] CPU backlight was enabled, disabling\n",
connector->base.base.id, connector->base.name);
intel_de_write(i915, BLC_PWM_CPU_CTL2, tmp & ~BLM_PWM_ENABLE);
}
intel_de_rmw(i915, BLC_PWM_PCH_CTL1, BLM_PCH_PWM_ENABLE, 0);
}
static void pch_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
intel_backlight_set_pwm_level(old_conn_state, val);
intel_de_rmw(i915, BLC_PWM_CPU_CTL2, BLM_PWM_ENABLE, 0);
intel_de_rmw(i915, BLC_PWM_PCH_CTL1, BLM_PCH_PWM_ENABLE, 0);
}
static void i9xx_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
{
intel_backlight_set_pwm_level(old_conn_state, val);
}
static void i965_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
{
struct drm_i915_private *i915 = to_i915(old_conn_state->connector->dev);
intel_backlight_set_pwm_level(old_conn_state, val);
intel_de_rmw(i915, BLC_PWM_CTL2, BLM_PWM_ENABLE, 0);
}
static void vlv_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
enum pipe pipe = to_intel_crtc(old_conn_state->crtc)->pipe;
intel_backlight_set_pwm_level(old_conn_state, val);
intel_de_rmw(i915, VLV_BLC_PWM_CTL2(pipe), BLM_PWM_ENABLE, 0);
}
static void bxt_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
intel_backlight_set_pwm_level(old_conn_state, val);
intel_de_rmw(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
BXT_BLC_PWM_ENABLE, 0);
if (panel->backlight.controller == 1)
intel_de_rmw(i915, UTIL_PIN_CTL, UTIL_PIN_ENABLE, 0);
}
static void cnp_disable_backlight(const struct drm_connector_state *old_conn_state, u32 val)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
intel_backlight_set_pwm_level(old_conn_state, val);
intel_de_rmw(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
BXT_BLC_PWM_ENABLE, 0);
}
static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct intel_panel *panel = &connector->panel;
intel_backlight_set_pwm_level(old_conn_state, level);
panel->backlight.pwm_state.enabled = false;
pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);
}
void intel_backlight_disable(const struct drm_connector_state *old_conn_state)
{
struct intel_connector *connector = to_intel_connector(old_conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
if (!panel->backlight.present)
return;
/*
* Do not disable backlight on the vga_switcheroo path. When switching
* away from i915, the other client may depend on i915 to handle the
* backlight. This will leave the backlight on unnecessarily when
* another client is not activated.
*/
if (i915->drm.switch_power_state == DRM_SWITCH_POWER_CHANGING) {
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] Skipping backlight disable on vga switch\n",
connector->base.base.id, connector->base.name);
return;
}
mutex_lock(&i915->display.backlight.lock);
if (panel->backlight.device)
panel->backlight.device->props.power = BACKLIGHT_POWER_OFF;
panel->backlight.enabled = false;
panel->backlight.funcs->disable(old_conn_state, 0);
mutex_unlock(&i915->display.backlight.lock);
}
static void lpt_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 pch_ctl1, pch_ctl2;
pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PCH backlight already enabled\n",
connector->base.base.id, connector->base.name);
pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
}
if (HAS_PCH_LPT(i915))
intel_de_rmw(i915, SOUTH_CHICKEN2, LPT_PWM_GRANULARITY,
panel->backlight.alternate_pwm_increment ?
LPT_PWM_GRANULARITY : 0);
else
intel_de_rmw(i915, SOUTH_CHICKEN1, SPT_PWM_GRANULARITY,
panel->backlight.alternate_pwm_increment ?
SPT_PWM_GRANULARITY : 0);
pch_ctl2 = panel->backlight.pwm_level_max << 16;
intel_de_write(i915, BLC_PWM_PCH_CTL2, pch_ctl2);
pch_ctl1 = 0;
if (panel->backlight.active_low_pwm)
pch_ctl1 |= BLM_PCH_POLARITY;
/* After LPT, override is the default. */
if (HAS_PCH_LPT(i915))
pch_ctl1 |= BLM_PCH_OVERRIDE_ENABLE;
intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
intel_de_posting_read(i915, BLC_PWM_PCH_CTL1);
intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
/* This won't stick until the above enable. */
intel_backlight_set_pwm_level(conn_state, level);
}
static void pch_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
u32 cpu_ctl2, pch_ctl1, pch_ctl2;
cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);
if (cpu_ctl2 & BLM_PWM_ENABLE) {
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] CPU backlight already enabled\n",
connector->base.base.id, connector->base.name);
cpu_ctl2 &= ~BLM_PWM_ENABLE;
intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2);
}
pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PCH backlight already enabled\n",
connector->base.base.id, connector->base.name);
pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
}
if (cpu_transcoder == TRANSCODER_EDP)
cpu_ctl2 = BLM_TRANSCODER_EDP;
else
cpu_ctl2 = BLM_PIPE(cpu_transcoder);
intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2);
intel_de_posting_read(i915, BLC_PWM_CPU_CTL2);
intel_de_write(i915, BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);
/* This won't stick until the above enable. */
intel_backlight_set_pwm_level(conn_state, level);
pch_ctl2 = panel->backlight.pwm_level_max << 16;
intel_de_write(i915, BLC_PWM_PCH_CTL2, pch_ctl2);
pch_ctl1 = 0;
if (panel->backlight.active_low_pwm)
pch_ctl1 |= BLM_PCH_POLARITY;
intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1);
intel_de_posting_read(i915, BLC_PWM_PCH_CTL1);
intel_de_write(i915, BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
}
static void i9xx_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 ctl, freq;
ctl = intel_de_read(i915, BLC_PWM_CTL);
if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
connector->base.base.id, connector->base.name);
intel_de_write(i915, BLC_PWM_CTL, 0);
}
freq = panel->backlight.pwm_level_max;
if (panel->backlight.combination_mode)
freq /= 0xff;
ctl = freq << 17;
if (panel->backlight.combination_mode)
ctl |= BLM_LEGACY_MODE;
if (IS_PINEVIEW(i915) && panel->backlight.active_low_pwm)
ctl |= BLM_POLARITY_PNV;
intel_de_write(i915, BLC_PWM_CTL, ctl);
intel_de_posting_read(i915, BLC_PWM_CTL);
/* XXX: combine this into above write? */
intel_backlight_set_pwm_level(conn_state, level);
/*
* Needed to enable backlight on some 855gm models. BLC_HIST_CTL is
* 855gm only, but checking for gen2 is safe, as 855gm is the only gen2
* that has backlight.
*/
if (DISPLAY_VER(i915) == 2)
intel_de_write(i915, BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE);
}
static void i965_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
enum pipe pipe = to_intel_crtc(conn_state->crtc)->pipe;
u32 ctl, ctl2, freq;
ctl2 = intel_de_read(i915, BLC_PWM_CTL2);
if (ctl2 & BLM_PWM_ENABLE) {
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
connector->base.base.id, connector->base.name);
ctl2 &= ~BLM_PWM_ENABLE;
intel_de_write(i915, BLC_PWM_CTL2, ctl2);
}
freq = panel->backlight.pwm_level_max;
if (panel->backlight.combination_mode)
freq /= 0xff;
ctl = freq << 16;
intel_de_write(i915, BLC_PWM_CTL, ctl);
ctl2 = BLM_PIPE(pipe);
if (panel->backlight.combination_mode)
ctl2 |= BLM_COMBINATION_MODE;
if (panel->backlight.active_low_pwm)
ctl2 |= BLM_POLARITY_I965;
intel_de_write(i915, BLC_PWM_CTL2, ctl2);
intel_de_posting_read(i915, BLC_PWM_CTL2);
intel_de_write(i915, BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
intel_backlight_set_pwm_level(conn_state, level);
}
static void vlv_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
u32 ctl, ctl2;
ctl2 = intel_de_read(i915, VLV_BLC_PWM_CTL2(pipe));
if (ctl2 & BLM_PWM_ENABLE) {
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
connector->base.base.id, connector->base.name);
ctl2 &= ~BLM_PWM_ENABLE;
intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2);
}
ctl = panel->backlight.pwm_level_max << 16;
intel_de_write(i915, VLV_BLC_PWM_CTL(pipe), ctl);
/* XXX: combine this into above write? */
intel_backlight_set_pwm_level(conn_state, level);
ctl2 = 0;
if (panel->backlight.active_low_pwm)
ctl2 |= BLM_POLARITY_I965;
intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2);
intel_de_posting_read(i915, VLV_BLC_PWM_CTL2(pipe));
intel_de_write(i915, VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
}
static void bxt_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
u32 pwm_ctl, val;
/* Controller 1 uses the utility pin. */
if (panel->backlight.controller == 1) {
val = intel_de_read(i915, UTIL_PIN_CTL);
if (val & UTIL_PIN_ENABLE) {
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] utility pin already enabled\n",
connector->base.base.id, connector->base.name);
val &= ~UTIL_PIN_ENABLE;
intel_de_write(i915, UTIL_PIN_CTL, val);
}
val = 0;
if (panel->backlight.util_pin_active_low)
val |= UTIL_PIN_POLARITY;
intel_de_write(i915, UTIL_PIN_CTL,
val | UTIL_PIN_PIPE(pipe) | UTIL_PIN_MODE_PWM | UTIL_PIN_ENABLE);
}
pwm_ctl = intel_de_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] backlight already enabled\n",
connector->base.base.id, connector->base.name);
pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
pwm_ctl);
}
intel_de_write(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller),
panel->backlight.pwm_level_max);
intel_backlight_set_pwm_level(conn_state, level);
pwm_ctl = 0;
if (panel->backlight.active_low_pwm)
pwm_ctl |= BXT_BLC_PWM_POLARITY;
intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
intel_de_posting_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
pwm_ctl | BXT_BLC_PWM_ENABLE);
}
static void cnp_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 pwm_ctl;
pwm_ctl = intel_de_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
if (pwm_ctl & BXT_BLC_PWM_ENABLE) {
drm_dbg_kms(&i915->drm, "backlight already enabled\n");
pwm_ctl &= ~BXT_BLC_PWM_ENABLE;
intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
pwm_ctl);
}
intel_de_write(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller),
panel->backlight.pwm_level_max);
intel_backlight_set_pwm_level(conn_state, level);
pwm_ctl = 0;
if (panel->backlight.active_low_pwm)
pwm_ctl |= BXT_BLC_PWM_POLARITY;
intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller), pwm_ctl);
intel_de_posting_read(i915, BXT_BLC_PWM_CTL(panel->backlight.controller));
intel_de_write(i915, BXT_BLC_PWM_CTL(panel->backlight.controller),
pwm_ctl | BXT_BLC_PWM_ENABLE);
}
static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct intel_panel *panel = &connector->panel;
pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100);
panel->backlight.pwm_state.enabled = true;
pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state);
}
static void __intel_backlight_enable(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct intel_panel *panel = &connector->panel;
WARN_ON(panel->backlight.max == 0);
if (panel->backlight.level < panel->backlight.min) {
panel->backlight.level = panel->backlight.min;
if (panel->backlight.device)
panel->backlight.device->props.brightness =
scale_hw_to_user(connector,
panel->backlight.level,
panel->backlight.device->props.max_brightness);
}
panel->backlight.funcs->enable(crtc_state, conn_state, panel->backlight.level);
panel->backlight.enabled = true;
if (panel->backlight.device)
panel->backlight.device->props.power = BACKLIGHT_POWER_ON;
}
void intel_backlight_enable(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
enum pipe pipe = to_intel_crtc(crtc_state->uapi.crtc)->pipe;
if (!panel->backlight.present)
return;
drm_dbg_kms(&i915->drm, "pipe %c\n", pipe_name(pipe));
mutex_lock(&i915->display.backlight.lock);
__intel_backlight_enable(crtc_state, conn_state);
mutex_unlock(&i915->display.backlight.lock);
}
#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)
static u32 intel_panel_get_backlight(struct intel_connector *connector)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 val = 0;
mutex_lock(&i915->display.backlight.lock);
if (panel->backlight.enabled)
val = panel->backlight.funcs->get(connector, intel_connector_get_pipe(connector));
mutex_unlock(&i915->display.backlight.lock);
drm_dbg_kms(&i915->drm, "get backlight PWM = %d\n", val);
return val;
}
/* Scale user_level in range [0..user_max] to [hw_min..hw_max]. */
static u32 scale_user_to_hw(struct intel_connector *connector,
u32 user_level, u32 user_max)
{
struct intel_panel *panel = &connector->panel;
return scale(user_level, 0, user_max,
panel->backlight.min, panel->backlight.max);
}
/* set backlight brightness to level in range [0..max], scaling wrt hw min */
static void intel_panel_set_backlight(const struct drm_connector_state *conn_state,
u32 user_level, u32 user_max)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 hw_level;
if (!panel->backlight.present)
return;
mutex_lock(&i915->display.backlight.lock);
drm_WARN_ON(&i915->drm, panel->backlight.max == 0);
hw_level = scale_user_to_hw(connector, user_level, user_max);
panel->backlight.level = hw_level;
if (panel->backlight.enabled)
intel_panel_actually_set_backlight(conn_state, hw_level);
mutex_unlock(&i915->display.backlight.lock);
}
static int intel_backlight_device_update_status(struct backlight_device *bd)
{
struct intel_connector *connector = bl_get_data(bd);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
drm_modeset_lock(&i915->drm.mode_config.connection_mutex, NULL);
drm_dbg_kms(&i915->drm, "updating intel_backlight, brightness=%d/%d\n",
bd->props.brightness, bd->props.max_brightness);
intel_panel_set_backlight(connector->base.state, bd->props.brightness,
bd->props.max_brightness);
/*
* Allow flipping bl_power as a sub-state of enabled. Sadly the
* backlight class device does not make it easy to differentiate
* between callbacks for brightness and bl_power, so our backlight_power
* callback needs to take this into account.
*/
if (panel->backlight.enabled) {
if (panel->backlight.power) {
bool enable = bd->props.power == BACKLIGHT_POWER_ON &&
bd->props.brightness != 0;
panel->backlight.power(connector, enable);
}
} else {
bd->props.power = BACKLIGHT_POWER_OFF;
}
drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);
return 0;
}
static int intel_backlight_device_get_brightness(struct backlight_device *bd)
{
struct intel_connector *connector = bl_get_data(bd);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
intel_wakeref_t wakeref;
int ret = 0;
with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
u32 hw_level;
drm_modeset_lock(&i915->drm.mode_config.connection_mutex, NULL);
hw_level = intel_panel_get_backlight(connector);
ret = scale_hw_to_user(connector,
hw_level, bd->props.max_brightness);
drm_modeset_unlock(&i915->drm.mode_config.connection_mutex);
}
return ret;
}
static const struct backlight_ops intel_backlight_device_ops = {
.update_status = intel_backlight_device_update_status,
.get_brightness = intel_backlight_device_get_brightness,
};
int intel_backlight_device_register(struct intel_connector *connector)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
struct backlight_properties props;
struct backlight_device *bd;
const char *name;
int ret = 0;
if (WARN_ON(panel->backlight.device))
return -ENODEV;
if (!panel->backlight.present)
return 0;
WARN_ON(panel->backlight.max == 0);
if (!acpi_video_backlight_use_native()) {
drm_info(&i915->drm, "Skipping intel_backlight registration\n");
return 0;
}
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
/*
* Note: Everything should work even if the backlight device max
* presented to the userspace is arbitrarily chosen.
*/
props.max_brightness = panel->backlight.max;
props.brightness = scale_hw_to_user(connector,
panel->backlight.level,
props.max_brightness);
if (panel->backlight.enabled)
props.power = BACKLIGHT_POWER_ON;
else
props.power = BACKLIGHT_POWER_OFF;
name = kstrdup_const("intel_backlight", GFP_KERNEL);
if (!name)
return -ENOMEM;
bd = backlight_device_get_by_name(name);
if (bd) {
put_device(&bd->dev);
/*
* Using the same name independent of the drm device or connector
* prevents registration of multiple backlight devices in the
* driver. However, we need to use the default name for backward
* compatibility. Use unique names for subsequent backlight devices as a
* fallback when the default name already exists.
*/
kfree_const(name);
name = kasprintf(GFP_KERNEL, "card%d-%s-backlight",
i915->drm.primary->index, connector->base.name);
if (!name)
return -ENOMEM;
}
bd = backlight_device_register(name, connector->base.kdev, connector,
&intel_backlight_device_ops, &props);
if (IS_ERR(bd)) {
drm_err(&i915->drm,
"[CONNECTOR:%d:%s] backlight device %s register failed: %ld\n",
connector->base.base.id, connector->base.name, name, PTR_ERR(bd));
ret = PTR_ERR(bd);
goto out;
}
panel->backlight.device = bd;
drm_dbg_kms(&i915->drm,
"[CONNECTOR:%d:%s] backlight device %s registered\n",
connector->base.base.id, connector->base.name, name);
out:
kfree_const(name);
return ret;
}
void intel_backlight_device_unregister(struct intel_connector *connector)
{
struct intel_panel *panel = &connector->panel;
if (panel->backlight.device) {
backlight_device_unregister(panel->backlight.device);
panel->backlight.device = NULL;
}
}
#endif /* CONFIG_BACKLIGHT_CLASS_DEVICE */
/*
* CNP: PWM clock frequency is 19.2 MHz or 24 MHz.
* PWM increment = 1
*/
static u32 cnp_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
return DIV_ROUND_CLOSEST(KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq),
pwm_freq_hz);
}
/*
* BXT: PWM clock frequency = 19.2 MHz.
*/
static u32 bxt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
{
return DIV_ROUND_CLOSEST(KHz(19200), pwm_freq_hz);
}
/*
* SPT: This value represents the period of the PWM stream in clock periods
* multiplied by 16 (default increment) or 128 (alternate increment selected in
* SCHICKEN_1 bit 0). PWM clock is 24 MHz.
*/
static u32 spt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
{
struct intel_panel *panel = &connector->panel;
u32 mul;
if (panel->backlight.alternate_pwm_increment)
mul = 128;
else
mul = 16;
return DIV_ROUND_CLOSEST(MHz(24), pwm_freq_hz * mul);
}
/*
* LPT: This value represents the period of the PWM stream in clock periods
* multiplied by 128 (default increment) or 16 (alternate increment, selected in
* LPT SOUTH_CHICKEN2 register bit 5).
*/
static u32 lpt_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 mul, clock;
if (panel->backlight.alternate_pwm_increment)
mul = 16;
else
mul = 128;
if (HAS_PCH_LPT_H(i915))
clock = MHz(135); /* LPT:H */
else
clock = MHz(24); /* LPT:LP */
return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
}
/*
* ILK/SNB/IVB: This value represents the period of the PWM stream in PCH
* display raw clocks multiplied by 128.
*/
static u32 pch_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
return DIV_ROUND_CLOSEST(KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq),
pwm_freq_hz * 128);
}
/*
* Gen2: This field determines the number of time base events (display core
* clock frequency/32) in total for a complete cycle of modulated backlight
* control.
*
* Gen3: A time base event equals the display core clock ([DevPNV] HRAW clock)
* divided by 32.
*/
static u32 i9xx_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
int clock;
if (IS_PINEVIEW(i915))
clock = KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq);
else
clock = KHz(i915->display.cdclk.hw.cdclk);
return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 32);
}
/*
* Gen4: This value represents the period of the PWM stream in display core
* clocks ([DevCTG] HRAW clocks) multiplied by 128.
*
*/
static u32 i965_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
int clock;
if (IS_G4X(i915))
clock = KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq);
else
clock = KHz(i915->display.cdclk.hw.cdclk);
return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * 128);
}
/*
* VLV: This value represents the period of the PWM stream in display core
* clocks ([DevCTG] 200MHz HRAW clocks) multiplied by 128 or 25MHz S0IX clocks
* multiplied by 16. CHV uses a 19.2MHz S0IX clock.
*/
static u32 vlv_hz_to_pwm(struct intel_connector *connector, u32 pwm_freq_hz)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
int mul, clock;
if ((intel_de_read(i915, CBR1_VLV) & CBR_PWM_CLOCK_MUX_SELECT) == 0) {
if (IS_CHERRYVIEW(i915))
clock = KHz(19200);
else
clock = MHz(25);
mul = 16;
} else {
clock = KHz(DISPLAY_RUNTIME_INFO(i915)->rawclk_freq);
mul = 128;
}
return DIV_ROUND_CLOSEST(clock, pwm_freq_hz * mul);
}
static u16 get_vbt_pwm_freq(struct intel_connector *connector)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
u16 pwm_freq_hz = connector->panel.vbt.backlight.pwm_freq_hz;
if (pwm_freq_hz) {
drm_dbg_kms(&i915->drm,
"VBT defined backlight frequency %u Hz\n",
pwm_freq_hz);
} else {
pwm_freq_hz = 200;
drm_dbg_kms(&i915->drm,
"default backlight frequency %u Hz\n",
pwm_freq_hz);
}
return pwm_freq_hz;
}
static u32 get_backlight_max_vbt(struct intel_connector *connector)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u16 pwm_freq_hz = get_vbt_pwm_freq(connector);
u32 pwm;
if (!panel->backlight.pwm_funcs->hz_to_pwm) {
drm_dbg_kms(&i915->drm,
"backlight frequency conversion not supported\n");
return 0;
}
pwm = panel->backlight.pwm_funcs->hz_to_pwm(connector, pwm_freq_hz);
if (!pwm) {
drm_dbg_kms(&i915->drm,
"backlight frequency conversion failed\n");
return 0;
}
return pwm;
}
/*
* Note: The setup hooks can't assume pipe is set!
*/
static u32 get_backlight_min_vbt(struct intel_connector *connector)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
int min;
drm_WARN_ON(&i915->drm, panel->backlight.pwm_level_max == 0);
/*
* XXX: If the vbt value is 255, it makes min equal to max, which leads
* to problems. There are such machines out there. Either our
* interpretation is wrong or the vbt has bogus data. Or both. Safeguard
* against this by letting the minimum be at most (arbitrarily chosen)
* 25% of the max.
*/
min = clamp_t(int, connector->panel.vbt.backlight.min_brightness, 0, 64);
if (min != connector->panel.vbt.backlight.min_brightness) {
drm_dbg_kms(&i915->drm,
"clamping VBT min backlight %d/255 to %d/255\n",
connector->panel.vbt.backlight.min_brightness, min);
}
/* vbt value is a coefficient in range [0..255] */
return scale(min, 0, 255, 0, panel->backlight.pwm_level_max);
}
static int lpt_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;
u32 cpu_ctl2, pch_ctl1, pch_ctl2, val;
bool alt, cpu_mode;
if (HAS_PCH_LPT(i915))
alt = intel_de_read(i915, SOUTH_CHICKEN2) & LPT_PWM_GRANULARITY;
else
alt = intel_de_read(i915, SOUTH_CHICKEN1) & SPT_PWM_GRANULARITY;
panel->backlight.alternate_pwm_increment = alt;
pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
pch_ctl2 = intel_de_read(i915, BLC_PWM_PCH_CTL2);
panel->backlight.pwm_level_max = pch_ctl2 >> 16;
cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);
if (!panel->backlight.pwm_level_max)
panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
if (!panel->backlight.pwm_level_max)
return -ENODEV;
panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
panel->backlight.pwm_enabled = pch_ctl1 & BLM_PCH_PWM_ENABLE;
cpu_mode = panel->backlight.pwm_enabled && HAS_PCH_LPT(i915) &&
!(pch_ctl1 & BLM_PCH_OVERRIDE_ENABLE) &&
(cpu_ctl2 & BLM_PWM_ENABLE);
if (cpu_mode) {
val = pch_get_backlight(connector, unused);
drm_dbg_kms(&i915->drm,
"CPU backlight register was enabled, switching to PCH override\n");
/* Write converted CPU PWM value to PCH override register */
lpt_set_backlight(connector->base.state, val);
intel_de_write(i915, BLC_PWM_PCH_CTL1,
pch_ctl1 | BLM_PCH_OVERRIDE_ENABLE);
intel_de_write(i915, BLC_PWM_CPU_CTL2,
cpu_ctl2 & ~BLM_PWM_ENABLE);
}
drm_dbg_kms(&i915->drm,
"[CONNECTOR:%d:%s] Using native PCH PWM for backlight control\n",
connector->base.base.id, connector->base.name);
return 0;
}
static int pch_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;
u32 cpu_ctl2, pch_ctl1, pch_ctl2;
pch_ctl1 = intel_de_read(i915, BLC_PWM_PCH_CTL1);
panel->backlight.active_low_pwm = pch_ctl1 & BLM_PCH_POLARITY;
pch_ctl2 = intel_de_read(i915, BLC_PWM_PCH_CTL2);
panel->backlight.pwm_level_max = pch_ctl2 >> 16;
if (!panel->backlight.pwm_level_max)
panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
if (!panel->backlight.pwm_level_max)
return -ENODEV;
panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
cpu_ctl2 = intel_de_read(i915, BLC_PWM_CPU_CTL2);
panel->backlight.pwm_enabled = (cpu_ctl2 & BLM_PWM_ENABLE) &&
(pch_ctl1 & BLM_PCH_PWM_ENABLE);
drm_dbg_kms(&i915->drm,
"[CONNECTOR:%d:%s] Using native PCH PWM for backlight control\n",
connector->base.base.id, connector->base.name);
return 0;
}
static int i9xx_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;
u32 ctl, val;
ctl = intel_de_read(i915, BLC_PWM_CTL);
if (DISPLAY_VER(i915) == 2 || IS_I915GM(i915) || IS_I945GM(i915))
panel->backlight.combination_mode = ctl & BLM_LEGACY_MODE;
if (IS_PINEVIEW(i915))
panel->backlight.active_low_pwm = ctl & BLM_POLARITY_PNV;
panel->backlight.pwm_level_max = ctl >> 17;
if (!panel->backlight.pwm_level_max) {
panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
panel->backlight.pwm_level_max >>= 1;
}
if (!panel->backlight.pwm_level_max)
return -ENODEV;
if (panel->backlight.combination_mode)
panel->backlight.pwm_level_max *= 0xff;
panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
val = i9xx_get_backlight(connector, unused);
val = intel_backlight_invert_pwm_level(connector, val);
val = clamp(val, panel->backlight.pwm_level_min, panel->backlight.pwm_level_max);
panel->backlight.pwm_enabled = val != 0;
drm_dbg_kms(&i915->drm,
"[CONNECTOR:%d:%s] Using native PWM for backlight control\n",
connector->base.base.id, connector->base.name);
return 0;
}
static int i965_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;
u32 ctl, ctl2;
ctl2 = intel_de_read(i915, BLC_PWM_CTL2);
panel->backlight.combination_mode = ctl2 & BLM_COMBINATION_MODE;
panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
ctl = intel_de_read(i915, BLC_PWM_CTL);
panel->backlight.pwm_level_max = ctl >> 16;
if (!panel->backlight.pwm_level_max)
panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
if (!panel->backlight.pwm_level_max)
return -ENODEV;
if (panel->backlight.combination_mode)
panel->backlight.pwm_level_max *= 0xff;
panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
drm_dbg_kms(&i915->drm,
"[CONNECTOR:%d:%s] Using native PWM for backlight control\n",
connector->base.base.id, connector->base.name);
return 0;
}
static int vlv_setup_backlight(struct intel_connector *connector, enum pipe pipe)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
u32 ctl, ctl2;
if (drm_WARN_ON(&i915->drm, pipe != PIPE_A && pipe != PIPE_B))
return -ENODEV;
ctl2 = intel_de_read(i915, VLV_BLC_PWM_CTL2(pipe));
panel->backlight.active_low_pwm = ctl2 & BLM_POLARITY_I965;
ctl = intel_de_read(i915, VLV_BLC_PWM_CTL(pipe));
panel->backlight.pwm_level_max = ctl >> 16;
if (!panel->backlight.pwm_level_max)
panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
if (!panel->backlight.pwm_level_max)
return -ENODEV;
panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
panel->backlight.pwm_enabled = ctl2 & BLM_PWM_ENABLE;
drm_dbg_kms(&i915->drm,
"[CONNECTOR:%d:%s] Using native PWM for backlight control (on pipe %c)\n",
connector->base.base.id, connector->base.name, pipe_name(pipe));
return 0;
}
static int
bxt_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;
u32 pwm_ctl, val;
panel->backlight.controller = connector->panel.vbt.backlight.controller;
pwm_ctl = intel_de_read(i915,
BXT_BLC_PWM_CTL(panel->backlight.controller));
/* Controller 1 uses the utility pin. */
if (panel->backlight.controller == 1) {
val = intel_de_read(i915, UTIL_PIN_CTL);
panel->backlight.util_pin_active_low =
val & UTIL_PIN_POLARITY;
}
panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
panel->backlight.pwm_level_max =
intel_de_read(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller));
if (!panel->backlight.pwm_level_max)
panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
if (!panel->backlight.pwm_level_max)
return -ENODEV;
panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
drm_dbg_kms(&i915->drm,
"[CONNECTOR:%d:%s] Using native PWM for backlight control (controller=%d)\n",
connector->base.base.id, connector->base.name,
panel->backlight.controller);
return 0;
}
static int cnp_num_backlight_controllers(struct drm_i915_private *i915)
{
if (INTEL_PCH_TYPE(i915) >= PCH_MTL)
return 2;
if (INTEL_PCH_TYPE(i915) >= PCH_DG1)
return 1;
if (INTEL_PCH_TYPE(i915) >= PCH_ICP)
return 2;
return 1;
}
static bool cnp_backlight_controller_is_valid(struct drm_i915_private *i915, int controller)
{
if (controller < 0 || controller >= cnp_num_backlight_controllers(i915))
return false;
if (controller == 1 &&
INTEL_PCH_TYPE(i915) >= PCH_ICP &&
INTEL_PCH_TYPE(i915) <= PCH_ADP)
return intel_de_read(i915, SOUTH_CHICKEN1) & ICP_SECOND_PPS_IO_SELECT;
return true;
}
static int
cnp_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;
u32 pwm_ctl;
/*
* CNP has the BXT implementation of backlight, but with only one
* controller. ICP+ can have two controllers, depending on pin muxing.
*/
panel->backlight.controller = connector->panel.vbt.backlight.controller;
if (!cnp_backlight_controller_is_valid(i915, panel->backlight.controller)) {
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] Invalid backlight controller %d, assuming 0\n",
connector->base.base.id, connector->base.name,
panel->backlight.controller);
panel->backlight.controller = 0;
}
pwm_ctl = intel_de_read(i915,
BXT_BLC_PWM_CTL(panel->backlight.controller));
panel->backlight.active_low_pwm = pwm_ctl & BXT_BLC_PWM_POLARITY;
panel->backlight.pwm_level_max =
intel_de_read(i915, BXT_BLC_PWM_FREQ(panel->backlight.controller));
if (!panel->backlight.pwm_level_max)
panel->backlight.pwm_level_max = get_backlight_max_vbt(connector);
if (!panel->backlight.pwm_level_max)
return -ENODEV;
panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
panel->backlight.pwm_enabled = pwm_ctl & BXT_BLC_PWM_ENABLE;
drm_dbg_kms(&i915->drm,
"[CONNECTOR:%d:%s] Using native PCH PWM for backlight control (controller=%d)\n",
connector->base.base.id, connector->base.name,
panel->backlight.controller);
return 0;
}
static int ext_pwm_setup_backlight(struct intel_connector *connector,
enum pipe pipe)
{
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
const char *desc;
u32 level;
/* Get the right PWM chip for DSI backlight according to VBT */
if (connector->panel.vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
panel->backlight.pwm = pwm_get(i915->drm.dev, "pwm_pmic_backlight");
desc = "PMIC";
} else {
panel->backlight.pwm = pwm_get(i915->drm.dev, "pwm_soc_backlight");
desc = "SoC";
}
if (IS_ERR(panel->backlight.pwm)) {
drm_err(&i915->drm, "[CONNECTOR:%d:%s] Failed to get the %s PWM chip\n",
connector->base.base.id, connector->base.name, desc);
panel->backlight.pwm = NULL;
return -ENODEV;
}
panel->backlight.pwm_level_max = 100; /* 100% */
panel->backlight.pwm_level_min = get_backlight_min_vbt(connector);
if (pwm_is_enabled(panel->backlight.pwm)) {
/* PWM is already enabled, use existing settings */
pwm_get_state(panel->backlight.pwm, &panel->backlight.pwm_state);
level = pwm_get_relative_duty_cycle(&panel->backlight.pwm_state,
100);
level = intel_backlight_invert_pwm_level(connector, level);
panel->backlight.pwm_enabled = true;
drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s] PWM already enabled at freq %ld, VBT freq %d, level %d\n",
connector->base.base.id, connector->base.name,
NSEC_PER_SEC / (unsigned long)panel->backlight.pwm_state.period,
get_vbt_pwm_freq(connector), level);
} else {
/* Set period from VBT frequency, leave other settings at 0. */
panel->backlight.pwm_state.period =
NSEC_PER_SEC / get_vbt_pwm_freq(connector);
}
drm_dbg_kms(&i915->drm,
"[CONNECTOR:%d:%s] Using %s PWM for backlight control\n",
connector->base.base.id, connector->base.name, desc);
return 0;
}
static void intel_pwm_set_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct intel_panel *panel = &connector->panel;
panel->backlight.pwm_funcs->set(conn_state,
intel_backlight_invert_pwm_level(connector, level));
}
static u32 intel_pwm_get_backlight(struct intel_connector *connector, enum pipe pipe)
{
struct intel_panel *panel = &connector->panel;
return intel_backlight_invert_pwm_level(connector,
panel->backlight.pwm_funcs->get(connector, pipe));
}
static void intel_pwm_enable_backlight(const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct intel_panel *panel = &connector->panel;
panel->backlight.pwm_funcs->enable(crtc_state, conn_state,
intel_backlight_invert_pwm_level(connector, level));
}
static void intel_pwm_disable_backlight(const struct drm_connector_state *conn_state, u32 level)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct intel_panel *panel = &connector->panel;
panel->backlight.pwm_funcs->disable(conn_state,
intel_backlight_invert_pwm_level(connector, level));
}
static int intel_pwm_setup_backlight(struct intel_connector *connector, enum pipe pipe)
{
struct intel_panel *panel = &connector->panel;
int ret;
ret = panel->backlight.pwm_funcs->setup(connector, pipe);
if (ret < 0)
return ret;
panel->backlight.min = panel->backlight.pwm_level_min;
panel->backlight.max = panel->backlight.pwm_level_max;
panel->backlight.level = intel_pwm_get_backlight(connector, pipe);
panel->backlight.enabled = panel->backlight.pwm_enabled;
return 0;
}
void intel_backlight_update(struct intel_atomic_state *state,
struct intel_encoder *encoder,
const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state)
{
struct intel_connector *connector = to_intel_connector(conn_state->connector);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
struct intel_panel *panel = &connector->panel;
if (!panel->backlight.present)
return;
mutex_lock(&i915->display.backlight.lock);
if (!panel->backlight.enabled)
__intel_backlight_enable(crtc_state, conn_state);
mutex_unlock(&i915->display.backlight.lock);
}
int intel_backlight_setup(struct intel_connector *connector, enum pipe pipe)
{
struct intel_display *display = to_intel_display(connector);
struct intel_panel *panel = &connector->panel;
int ret;
if (!connector->panel.vbt.backlight.present) {
if (intel_has_quirk(display, QUIRK_BACKLIGHT_PRESENT)) {
drm_dbg_kms(display->drm,
"[CONNECTOR:%d:%s] no backlight present per VBT, but present per quirk\n",
connector->base.base.id, connector->base.name);
} else {
drm_dbg_kms(display->drm,
"[CONNECTOR:%d:%s] no backlight present per VBT\n",
connector->base.base.id, connector->base.name);
return 0;
}
}
/* ensure intel_panel has been initialized first */
if (drm_WARN_ON(display->drm, !panel->backlight.funcs))
return -ENODEV;
/* set level and max in panel struct */
mutex_lock(&display->backlight.lock);
ret = panel->backlight.funcs->setup(connector, pipe);
mutex_unlock(&display->backlight.lock);
if (ret) {
drm_dbg_kms(display->drm,
"[CONNECTOR:%d:%s] failed to setup backlight\n",
connector->base.base.id, connector->base.name);
return ret;
}
panel->backlight.present = true;
drm_dbg_kms(display->drm,
"[CONNECTOR:%d:%s] backlight initialized, %s, brightness %u/%u\n",
connector->base.base.id, connector->base.name,
str_enabled_disabled(panel->backlight.enabled),
panel->backlight.level, panel->backlight.max);
return 0;
}
void intel_backlight_destroy(struct intel_panel *panel)
{
/* dispose of the pwm */
if (panel->backlight.pwm)
pwm_put(panel->backlight.pwm);
panel->backlight.present = false;
}
static const struct intel_panel_bl_funcs bxt_pwm_funcs = {
.setup = bxt_setup_backlight,
.enable = bxt_enable_backlight,
.disable = bxt_disable_backlight,
.set = bxt_set_backlight,
.get = bxt_get_backlight,
.hz_to_pwm = bxt_hz_to_pwm,
};
static const struct intel_panel_bl_funcs cnp_pwm_funcs = {
.setup = cnp_setup_backlight,
.enable = cnp_enable_backlight,
.disable = cnp_disable_backlight,
.set = bxt_set_backlight,
.get = bxt_get_backlight,
.hz_to_pwm = cnp_hz_to_pwm,
};
static const struct intel_panel_bl_funcs lpt_pwm_funcs = {
.setup = lpt_setup_backlight,
.enable = lpt_enable_backlight,
.disable = lpt_disable_backlight,
.set = lpt_set_backlight,
.get = lpt_get_backlight,
.hz_to_pwm = lpt_hz_to_pwm,
};
static const struct intel_panel_bl_funcs spt_pwm_funcs = {
.setup = lpt_setup_backlight,
.enable = lpt_enable_backlight,
.disable = lpt_disable_backlight,
.set = lpt_set_backlight,
.get = lpt_get_backlight,
.hz_to_pwm = spt_hz_to_pwm,
};
static const struct intel_panel_bl_funcs pch_pwm_funcs = {
.setup = pch_setup_backlight,
.enable = pch_enable_backlight,
.disable = pch_disable_backlight,
.set = pch_set_backlight,
.get = pch_get_backlight,
.hz_to_pwm = pch_hz_to_pwm,
};
static const struct intel_panel_bl_funcs ext_pwm_funcs = {
.setup = ext_pwm_setup_backlight,
.enable = ext_pwm_enable_backlight,
.disable = ext_pwm_disable_backlight,
.set = ext_pwm_set_backlight,
.get = ext_pwm_get_backlight,
};
static const struct intel_panel_bl_funcs vlv_pwm_funcs = {
.setup = vlv_setup_backlight,
.enable = vlv_enable_backlight,
.disable = vlv_disable_backlight,
.set = vlv_set_backlight,
.get = vlv_get_backlight,
.hz_to_pwm = vlv_hz_to_pwm,
};
static const struct intel_panel_bl_funcs i965_pwm_funcs = {
.setup = i965_setup_backlight,
.enable = i965_enable_backlight,
.disable = i965_disable_backlight,
.set = i9xx_set_backlight,
.get = i9xx_get_backlight,
.hz_to_pwm = i965_hz_to_pwm,
};
static const struct intel_panel_bl_funcs i9xx_pwm_funcs = {
.setup = i9xx_setup_backlight,
.enable = i9xx_enable_backlight,
.disable = i9xx_disable_backlight,
.set = i9xx_set_backlight,
.get = i9xx_get_backlight,
.hz_to_pwm = i9xx_hz_to_pwm,
};
static const struct intel_panel_bl_funcs pwm_bl_funcs = {
.setup = intel_pwm_setup_backlight,
.enable = intel_pwm_enable_backlight,
.disable = intel_pwm_disable_backlight,
.set = intel_pwm_set_backlight,
.get = intel_pwm_get_backlight,
};
/* Set up chip specific backlight functions */
void intel_backlight_init_funcs(struct intel_panel *panel)
{
struct intel_connector *connector =
container_of(panel, struct intel_connector, panel);
struct drm_i915_private *i915 = to_i915(connector->base.dev);
if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
intel_dsi_dcs_init_backlight_funcs(connector) == 0)
return;
if (IS_GEMINILAKE(i915) || IS_BROXTON(i915)) {
panel->backlight.pwm_funcs = &bxt_pwm_funcs;
} else if (INTEL_PCH_TYPE(i915) >= PCH_CNP) {
panel->backlight.pwm_funcs = &cnp_pwm_funcs;
} else if (INTEL_PCH_TYPE(i915) >= PCH_LPT) {
if (HAS_PCH_LPT(i915))
panel->backlight.pwm_funcs = &lpt_pwm_funcs;
else
panel->backlight.pwm_funcs = &spt_pwm_funcs;
} else if (HAS_PCH_SPLIT(i915)) {
panel->backlight.pwm_funcs = &pch_pwm_funcs;
} else if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI) {
panel->backlight.pwm_funcs = &ext_pwm_funcs;
} else {
panel->backlight.pwm_funcs = &vlv_pwm_funcs;
}
} else if (DISPLAY_VER(i915) == 4) {
panel->backlight.pwm_funcs = &i965_pwm_funcs;
} else {
panel->backlight.pwm_funcs = &i9xx_pwm_funcs;
}
if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) {
if (intel_dp_aux_init_backlight_funcs(connector) == 0)
return;
if (!intel_has_quirk(&i915->display, QUIRK_NO_PPS_BACKLIGHT_POWER_HOOK))
connector->panel.backlight.power = intel_pps_backlight_power;
}
/* We're using a standard PWM backlight interface */
panel->backlight.funcs = &pwm_bl_funcs;
}
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