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drm/i915: do full backlight setup at enable time
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We should now have all the information we need to do a full
initialization of the backlight registers.

v2: Keep QUIRK_NO_PCH_PWM_ENABLE for now (Imre).

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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Jani Nikula authored and Daniel Vetter committed Nov 14, 2013
1 parent 636baeb commit b35684b
Showing 1 changed file with 93 additions and 56 deletions.
149 changes: 93 additions & 56 deletions drivers/gpu/drm/i915/intel_panel.c
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Original file line number Diff line number Diff line change
Expand Up @@ -719,50 +719,75 @@ static void pch_enable_backlight(struct intel_connector *connector)
enum pipe pipe = intel_get_pipe_from_connector(connector);
enum transcoder cpu_transcoder =
intel_pipe_to_cpu_transcoder(dev_priv, pipe);
u32 tmp;

tmp = I915_READ(BLC_PWM_CPU_CTL2);
u32 cpu_ctl2, pch_ctl1, pch_ctl2;

/* Note that this can also get called through dpms changes. And
* we don't track the backlight dpms state, hence check whether
* we have to do anything first. */
if (tmp & BLM_PWM_ENABLE)
return;
cpu_ctl2 = I915_READ(BLC_PWM_CPU_CTL2);
if (cpu_ctl2 & BLM_PWM_ENABLE) {
WARN(1, "cpu backlight already enabled\n");
cpu_ctl2 &= ~BLM_PWM_ENABLE;
I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
}

if (INTEL_INFO(dev)->num_pipes == 3)
tmp &= ~BLM_PIPE_SELECT_IVB;
else
tmp &= ~BLM_PIPE_SELECT;
pch_ctl1 = I915_READ(BLC_PWM_PCH_CTL1);
if (pch_ctl1 & BLM_PCH_PWM_ENABLE) {
DRM_DEBUG_KMS("pch backlight already enabled\n");
pch_ctl1 &= ~BLM_PCH_PWM_ENABLE;
I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
}

if (cpu_transcoder == TRANSCODER_EDP)
tmp |= BLM_TRANSCODER_EDP;
cpu_ctl2 = BLM_TRANSCODER_EDP;
else
tmp |= BLM_PIPE(cpu_transcoder);
tmp &= ~BLM_PWM_ENABLE;

I915_WRITE(BLC_PWM_CPU_CTL2, tmp);
cpu_ctl2 = BLM_PIPE(cpu_transcoder);
I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2);
POSTING_READ(BLC_PWM_CPU_CTL2);
I915_WRITE(BLC_PWM_CPU_CTL2, tmp | BLM_PWM_ENABLE);

if (!(dev_priv->quirks & QUIRK_NO_PCH_PWM_ENABLE)) {
tmp = I915_READ(BLC_PWM_PCH_CTL1);
tmp |= BLM_PCH_PWM_ENABLE;
tmp &= ~BLM_PCH_OVERRIDE_ENABLE;
I915_WRITE(BLC_PWM_PCH_CTL1, tmp);
}
I915_WRITE(BLC_PWM_CPU_CTL2, cpu_ctl2 | BLM_PWM_ENABLE);

/*
* Call below after setting BLC_PWM_CPU_CTL2 and BLC_PWM_PCH_CTL1.
* BLC_PWM_CPU_CTL may be cleared to zero automatically when these
* registers are set.
*/
/* This won't stick until the above enable. */
intel_panel_actually_set_backlight(connector, panel->backlight.level);

pch_ctl2 = panel->backlight.max << 16;
I915_WRITE(BLC_PWM_PCH_CTL2, pch_ctl2);

/* XXX: transitional */
if (dev_priv->quirks & QUIRK_NO_PCH_PWM_ENABLE)
return;

pch_ctl1 = 0;
if (panel->backlight.active_low_pwm)
pch_ctl1 |= BLM_PCH_POLARITY;
I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1);
POSTING_READ(BLC_PWM_PCH_CTL1);
I915_WRITE(BLC_PWM_PCH_CTL1, pch_ctl1 | BLM_PCH_PWM_ENABLE);
}

static void i9xx_enable_backlight(struct intel_connector *connector)
{
struct drm_device *dev = connector->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
u32 ctl, freq;

ctl = I915_READ(BLC_PWM_CTL);
if (ctl & BACKLIGHT_DUTY_CYCLE_MASK_PNV) {
WARN(1, "backlight already enabled\n");
I915_WRITE(BLC_PWM_CTL, 0);
}

freq = panel->backlight.max;
if (panel->backlight.combination_mode)
freq /= 0xff;

ctl = freq << 17;
if (IS_GEN2(dev) && panel->backlight.combination_mode)
ctl |= BLM_LEGACY_MODE;
if (IS_PINEVIEW(dev) && panel->backlight.active_low_pwm)
ctl |= BLM_POLARITY_PNV;

I915_WRITE(BLC_PWM_CTL, ctl);
POSTING_READ(BLC_PWM_CTL);

/* XXX: combine this into above write? */
intel_panel_actually_set_backlight(connector, panel->backlight.level);
}

Expand All @@ -772,25 +797,33 @@ static void i965_enable_backlight(struct intel_connector *connector)
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 tmp;
u32 ctl, ctl2, freq;

tmp = I915_READ(BLC_PWM_CTL2);
ctl2 = I915_READ(BLC_PWM_CTL2);
if (ctl2 & BLM_PWM_ENABLE) {
WARN(1, "backlight already enabled\n");
ctl2 &= ~BLM_PWM_ENABLE;
I915_WRITE(BLC_PWM_CTL2, ctl2);
}

/* Note that this can also get called through dpms changes. And
* we don't track the backlight dpms state, hence check whether
* we have to do anything first. */
if (tmp & BLM_PWM_ENABLE)
return;
freq = panel->backlight.max;
if (panel->backlight.combination_mode)
freq /= 0xff;

tmp &= ~BLM_PIPE_SELECT;
tmp |= BLM_PIPE(pipe);
tmp &= ~BLM_PWM_ENABLE;

I915_WRITE(BLC_PWM_CTL2, tmp);
POSTING_READ(BLC_PWM_CTL2);
I915_WRITE(BLC_PWM_CTL2, tmp | BLM_PWM_ENABLE);
ctl = freq << 16;
I915_WRITE(BLC_PWM_CTL, ctl);

/* XXX: combine this into above write? */
intel_panel_actually_set_backlight(connector, panel->backlight.level);

ctl2 = BLM_PIPE(pipe);
if (panel->backlight.combination_mode)
ctl2 |= BLM_COMBINATION_MODE;
if (panel->backlight.active_low_pwm)
ctl2 |= BLM_POLARITY_I965;
I915_WRITE(BLC_PWM_CTL2, ctl2);
POSTING_READ(BLC_PWM_CTL2);
I915_WRITE(BLC_PWM_CTL2, ctl2 | BLM_PWM_ENABLE);
}

static void vlv_enable_backlight(struct intel_connector *connector)
Expand All @@ -799,23 +832,27 @@ static void vlv_enable_backlight(struct intel_connector *connector)
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_panel *panel = &connector->panel;
enum pipe pipe = intel_get_pipe_from_connector(connector);
u32 tmp;
u32 ctl, ctl2;

tmp = I915_READ(VLV_BLC_PWM_CTL2(pipe));
ctl2 = I915_READ(VLV_BLC_PWM_CTL2(pipe));
if (ctl2 & BLM_PWM_ENABLE) {
WARN(1, "backlight already enabled\n");
ctl2 &= ~BLM_PWM_ENABLE;
I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
}

/* Note that this can also get called through dpms changes. And
* we don't track the backlight dpms state, hence check whether
* we have to do anything first. */
if (tmp & BLM_PWM_ENABLE)
return;
ctl = panel->backlight.max << 16;
I915_WRITE(VLV_BLC_PWM_CTL(pipe), ctl);

tmp &= ~BLM_PWM_ENABLE;
/* XXX: combine this into above write? */
intel_panel_actually_set_backlight(connector, panel->backlight.level);

I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp);
ctl2 = 0;
if (panel->backlight.active_low_pwm)
ctl2 |= BLM_POLARITY_I965;
I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2);
POSTING_READ(VLV_BLC_PWM_CTL2(pipe));
I915_WRITE(VLV_BLC_PWM_CTL2(pipe), tmp | BLM_PWM_ENABLE);

intel_panel_actually_set_backlight(connector, panel->backlight.level);
I915_WRITE(VLV_BLC_PWM_CTL2(pipe), ctl2 | BLM_PWM_ENABLE);
}

void intel_panel_enable_backlight(struct intel_connector *connector)
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