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drm/i915: don't rely on previous values set on DDI_BUF_CTL

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Just set the only bit we need, everything else is either ignored on
HDMI or should be set to zero.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Paulo Zanoni 2012-10-05 12:05:59 -03:00 committed by Daniel Vetter
parent 6441ab5f8f
commit 1e6210f45d
1 changed files with 1 additions and 5 deletions
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6
drivers/gpu/drm/i915/intel_ddi.c
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@ -1017,16 +1017,12 @@ void intel_enable_ddi(struct intel_encoder *encoder)
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(&encoder->base);
int port = intel_hdmi->ddi_port;
u32 temp;
temp = I915_READ(DDI_BUF_CTL(port));
temp |= DDI_BUF_CTL_ENABLE;
/* Enable DDI_BUF_CTL. In HDMI/DVI mode, the port width,
* and swing/emphasis values are ignored so nothing special needs
* to be done besides enabling the port.
*/
I915_WRITE(DDI_BUF_CTL(port), temp);
I915_WRITE(DDI_BUF_CTL(port), DDI_BUF_CTL_ENABLE);
}
void intel_disable_ddi(struct intel_encoder *encoder)