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drm/i915: fix eDP detection 

Panel needs to be powered up.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
hifive-unleashed-5.1
Jesse Barnes 2010-09-08 12:41:59 -07:00 committed by Chris Wilson
parent f4433a8d5d
commit 7eaf5547d0
1 changed files with 12 additions and 3 deletions
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15
drivers/gpu/drm/i915/intel_dp.c
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@ -754,13 +754,14 @@ intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
}
}
static void ironlake_edp_panel_on (struct drm_device *dev)
/* Returns true if the panel was already on when called */
static bool ironlake_edp_panel_on (struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 pp;
if (I915_READ(PCH_PP_STATUS) & PP_ON)
return;
return true;
pp = I915_READ(PCH_PP_CONTROL);
@ -780,6 +781,8 @@ static void ironlake_edp_panel_on (struct drm_device *dev)
pp |= PANEL_POWER_RESET; /* restore panel reset bit */
I915_WRITE(PCH_PP_CONTROL, pp);
POSTING_READ(PCH_PP_CONTROL);
return false;
}
static void ironlake_edp_panel_off (struct drm_device *dev)
@ -860,7 +863,7 @@ static void intel_dp_prepare(struct drm_encoder *encoder)
struct drm_i915_private *dev_priv = dev->dev_private;
uint32_t dp_reg = I915_READ(intel_dp->output_reg);
if (IS_eDP(intel_dp)) {
if (IS_eDP(intel_dp) || IS_PCH_eDP(intel_dp)) {
ironlake_edp_backlight_off(dev);
ironlake_edp_panel_on(dev);
ironlake_edp_pll_on(encoder);
@ -1365,7 +1368,11 @@ ironlake_dp_detect(struct drm_connector *connector)
struct drm_encoder *encoder = intel_attached_encoder(connector);
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
enum drm_connector_status status;
bool was_on = false;
/* Panel needs power for AUX to work */
if (IS_eDP(intel_dp) || IS_PCH_eDP(intel_dp))
was_on = ironlake_edp_panel_on(connector->dev);
status = connector_status_disconnected;
if (intel_dp_aux_native_read(intel_dp,
0x000, intel_dp->dpcd,
@ -1376,6 +1383,8 @@ ironlake_dp_detect(struct drm_connector *connector)
}
DRM_DEBUG_KMS("DPCD: %hx%hx%hx%hx\n", intel_dp->dpcd[0],
intel_dp->dpcd[1], intel_dp->dpcd[2], intel_dp->dpcd[3]);
if ((IS_eDP(intel_dp) || IS_PCH_eDP(intel_dp)) && !was_on)
ironlake_edp_panel_off(connector->dev);
return status;
}