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drm/i915: disable DDI_BUF_CTL at the correct time 

And also properly wait for its idle bit.

You may notice that DDI_BUF_CTL is enabled in .enable but disabled in
.post_disable instead of .disable. Yes, the mode set sequence is not
exactly symmetrical, but let's assume the spec is correct unless we
can prove it's wrong.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Paulo Zanoni 2012-10-05 12:06:00 -03:00 committed by Daniel Vetter
parent 27c6f0a589
commit 2886e93f5d
1 changed files with 23 additions and 10 deletions
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33
drivers/gpu/drm/i915/intel_ddi.c
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@ -1002,11 +1002,33 @@ void intel_ddi_pre_enable(struct intel_encoder *intel_encoder)
I915_WRITE(PORT_CLK_SEL(port), intel_crtc->ddi_pll_sel);
}
static void intel_wait_ddi_buf_idle(struct drm_i915_private *dev_priv,
enum port port)
{
uint32_t reg = DDI_BUF_CTL(port);
int i;
for (i = 0; i < 8; i++) {
udelay(1);
if (I915_READ(reg) & DDI_BUF_IS_IDLE)
return;
}
DRM_ERROR("Timeout waiting for DDI BUF %c idle bit\n", port_name(port));
}
void intel_ddi_post_disable(struct intel_encoder *intel_encoder)
{
struct drm_encoder *encoder = &intel_encoder->base;
struct drm_i915_private *dev_priv = encoder->dev->dev_private;
enum port port = intel_ddi_get_encoder_port(intel_encoder);
uint32_t val;
val = I915_READ(DDI_BUF_CTL(port));
if (val & DDI_BUF_CTL_ENABLE) {
val &= ~DDI_BUF_CTL_ENABLE;
I915_WRITE(DDI_BUF_CTL(port), val);
intel_wait_ddi_buf_idle(dev_priv, port);
}
I915_WRITE(PORT_CLK_SEL(port), PORT_CLK_SEL_NONE);
}
@ -1027,16 +1049,7 @@ void intel_enable_ddi(struct intel_encoder *encoder)
void intel_disable_ddi(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
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;
I915_WRITE(DDI_BUF_CTL(port), temp);
/* This will be needed in the future, so leave it here for now */
}
static int intel_ddi_get_cdclk_freq(struct drm_i915_private *dev_priv)