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drm/i915/lvds: Always restore panel-fitter when enabling the LVDS

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Linus Torvalds pointed out that our code was unbalanced when powering on
the panel with respect to the power off sequence in that we were failing
to restore the panel-fitter. The consequence of this would be that
across a simple DPMS off/on for a non-native mode, without an intervening
modeset, the panel fitter would remain disabled and the output would shift
on the panel.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2010-12-05 19:21:18 +00:00
parent 6fd0d56e3b
commit 2a1292fd4c
1 changed files with 55 additions and 45 deletions
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100
drivers/gpu/drm/i915/intel_lvds.c
View file

@ -68,7 +68,7 @@ static struct intel_lvds *intel_attached_lvds(struct drm_connector *connector)
/**
* Sets the power state for the panel.
*/
static void intel_lvds_set_power(struct intel_lvds *intel_lvds, bool on)
static void intel_lvds_enable(struct intel_lvds *intel_lvds)
{
struct drm_device *dev = intel_lvds->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
@ -82,26 +82,61 @@ static void intel_lvds_set_power(struct intel_lvds *intel_lvds, bool on)
lvds_reg = LVDS;
}
if (on) {
I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
intel_panel_set_backlight(dev, dev_priv->backlight_level);
} else {
dev_priv->backlight_level = intel_panel_get_backlight(dev);
I915_WRITE(lvds_reg, I915_READ(lvds_reg) | LVDS_PORT_EN);
intel_panel_set_backlight(dev, 0);
I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
if (intel_lvds->pfit_control) {
if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
DRM_ERROR("timed out waiting for panel to power off\n");
I915_WRITE(PFIT_CONTROL, 0);
intel_lvds->pfit_control = 0;
if (intel_lvds->pfit_dirty) {
/*
* Enable automatic panel scaling so that non-native modes
* fill the screen. The panel fitter should only be
* adjusted whilst the pipe is disabled, according to
* register description and PRM.
*/
DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
intel_lvds->pfit_control,
intel_lvds->pfit_pgm_ratios);
if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000)) {
DRM_ERROR("timed out waiting for panel to power off\n");
} else {
I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
intel_lvds->pfit_dirty = false;
}
I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
}
I915_WRITE(ctl_reg, I915_READ(ctl_reg) | POWER_TARGET_ON);
POSTING_READ(lvds_reg);
intel_panel_set_backlight(dev, dev_priv->backlight_level);
}
static void intel_lvds_disable(struct intel_lvds *intel_lvds)
{
struct drm_device *dev = intel_lvds->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 ctl_reg, lvds_reg;
if (HAS_PCH_SPLIT(dev)) {
ctl_reg = PCH_PP_CONTROL;
lvds_reg = PCH_LVDS;
} else {
ctl_reg = PP_CONTROL;
lvds_reg = LVDS;
}
dev_priv->backlight_level = intel_panel_get_backlight(dev);
intel_panel_set_backlight(dev, 0);
I915_WRITE(ctl_reg, I915_READ(ctl_reg) & ~POWER_TARGET_ON);
if (intel_lvds->pfit_control) {
if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
DRM_ERROR("timed out waiting for panel to power off\n");
I915_WRITE(PFIT_CONTROL, 0);
intel_lvds->pfit_dirty = true;
}
I915_WRITE(lvds_reg, I915_READ(lvds_reg) & ~LVDS_PORT_EN);
POSTING_READ(lvds_reg);
}
@ -110,9 +145,9 @@ static void intel_lvds_dpms(struct drm_encoder *encoder, int mode)
struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
if (mode == DRM_MODE_DPMS_ON)
intel_lvds_set_power(intel_lvds, true);
intel_lvds_enable(intel_lvds);
else
intel_lvds_set_power(intel_lvds, false);
intel_lvds_disable(intel_lvds);
/* XXX: We never power down the LVDS pairs. */
}
@ -411,43 +446,18 @@ static void intel_lvds_commit(struct drm_encoder *encoder)
/* Always do a full power on as we do not know what state
* we were left in.
*/
intel_lvds_set_power(intel_lvds, true);
intel_lvds_enable(intel_lvds);
}
static void intel_lvds_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_lvds *intel_lvds = to_intel_lvds(encoder);
/*
* The LVDS pin pair will already have been turned on in the
* intel_crtc_mode_set since it has a large impact on the DPLL
* settings.
*/
if (HAS_PCH_SPLIT(dev))
return;
if (!intel_lvds->pfit_dirty)
return;
/*
* Enable automatic panel scaling so that non-native modes fill the
* screen. Should be enabled before the pipe is enabled, according to
* register description and PRM.
*/
DRM_DEBUG_KMS("applying panel-fitter: %x, %x\n",
intel_lvds->pfit_control,
intel_lvds->pfit_pgm_ratios);
if (wait_for((I915_READ(PP_STATUS) & PP_ON) == 0, 1000))
DRM_ERROR("timed out waiting for panel to power off\n");
I915_WRITE(PFIT_PGM_RATIOS, intel_lvds->pfit_pgm_ratios);
I915_WRITE(PFIT_CONTROL, intel_lvds->pfit_control);
intel_lvds->pfit_dirty = false;
}
/**