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drm/i915: Disable DPOunit clock gating

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Otherwise, this can stall pipe. We also need DPLL REFA always
enabled

Signed-off-by: Shobhit Kumar <shobhit.kumar@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Shobhit Kumar 2014-04-09 13:59:32 +05:30 committed by Daniel Vetter
parent 2634fd7fd8
commit 20e5bf667a
1 changed files with 24 additions and 2 deletions
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26
drivers/gpu/drm/i915/intel_dsi.c
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@ -163,16 +163,31 @@ static void intel_dsi_enable(struct intel_encoder *encoder)
static void intel_dsi_pre_enable(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
enum pipe pipe = intel_crtc->pipe;
u32 tmp;
DRM_DEBUG_KMS("\n");
if (intel_dsi->dev.dev_ops->panel_reset)
intel_dsi->dev.dev_ops->panel_reset(&intel_dsi->dev);
/* Disable DPOunit clock gating, can stall pipe
* and we need DPLL REFA always enabled */
tmp = I915_READ(DPLL(pipe));
tmp |= DPLL_REFA_CLK_ENABLE_VLV;
I915_WRITE(DPLL(pipe), tmp);
tmp = I915_READ(DSPCLK_GATE_D);
tmp |= DPOUNIT_CLOCK_GATE_DISABLE;
I915_WRITE(DSPCLK_GATE_D, tmp);
/* put device in ready state */
intel_dsi_device_ready(encoder);
if (intel_dsi->dev.dev_ops->panel_reset)
intel_dsi->dev.dev_ops->panel_reset(&intel_dsi->dev);
if (intel_dsi->dev.dev_ops->send_otp_cmds)
intel_dsi->dev.dev_ops->send_otp_cmds(&intel_dsi->dev);
@ -251,14 +266,21 @@ static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
vlv_disable_dsi_pll(encoder);
}
static void intel_dsi_post_disable(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
u32 val;
DRM_DEBUG_KMS("\n");
intel_dsi_clear_device_ready(encoder);
val = I915_READ(DSPCLK_GATE_D);
val &= ~DPOUNIT_CLOCK_GATE_DISABLE;
I915_WRITE(DSPCLK_GATE_D, val);
if (intel_dsi->dev.dev_ops->disable_panel_power)
intel_dsi->dev.dev_ops->disable_panel_power(&intel_dsi->dev);
}