diff options
Diffstat (limited to 'drivers/gpu/drm/i915')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_display.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 1b57fbc5eb5b..7509e7903c22 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1729,6 +1729,11 @@ static void lpt_enable_pch_transcoder(struct drm_i915_private *dev_priv, assert_fdi_tx_enabled(dev_priv, cpu_transcoder); assert_fdi_rx_enabled(dev_priv, TRANSCODER_A); + /* Workaround: set timing override bit. */ + val = I915_READ(_TRANSA_CHICKEN2); + val |= TRANS_AUTOTRAIN_GEN_STALL_DIS; + I915_WRITE(_TRANSA_CHICKEN2, val); + val = TRANS_ENABLE; pipeconf_val = I915_READ(PIPECONF(cpu_transcoder)); @@ -1780,6 +1785,11 @@ static void lpt_disable_pch_transcoder(struct drm_i915_private *dev_priv, /* wait for PCH transcoder off, transcoder state */ if (wait_for((I915_READ(_TRANSACONF) & TRANS_STATE_ENABLE) == 0, 50)) DRM_ERROR("Failed to disable PCH transcoder\n"); + + /* Workaround: clear timing override bit. */ + val = I915_READ(_TRANSA_CHICKEN2); + val &= ~TRANS_AUTOTRAIN_GEN_STALL_DIS; + I915_WRITE(_TRANSA_CHICKEN2, val); } /** |