diff options
| author | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-10-07 16:01:21 -0700 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2010-10-08 10:28:26 +0100 |
| commit | 896673836b8c55b75e7d7d2741aaaadff0c6a038 (patch) | |
| tree | 997f423cd95c1ec6d3e9fb3028b6493e81eec950 /drivers/gpu/drm/i915/intel_dp.c | |
| parent | 8088699f029b2a27af9bc5431ef7542c84195760 (diff) | |
drm/i915/dp: cache eDP DPCD data
Cache the first 4 bytes of DPCD data in the eDP case. It's unlikely to
change and can save us some trouble at link training time.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dp.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 944dfe199f6..7fa828275e4 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1724,6 +1724,26 @@ intel_dp_init(struct drm_device *dev, int output_reg) intel_dp_i2c_init(intel_dp, intel_connector, name); + /* Cache some DPCD data in the eDP case */ + if (is_edp(intel_dp)) { + int ret; + bool was_on; + + was_on = ironlake_edp_panel_on(intel_dp); + ret = intel_dp_aux_native_read(intel_dp, DP_DPCD_REV, + intel_dp->dpcd, + sizeof(intel_dp->dpcd)); + if (ret == sizeof(intel_dp->dpcd)) { + if (intel_dp->dpcd[0] >= 0x11) + dev_priv->no_aux_handshake = intel_dp->dpcd[3] & + DP_NO_AUX_HANDSHAKE_LINK_TRAINING; + } else { + DRM_ERROR("failed to retrieve link info\n"); + } + if (!was_on) + ironlake_edp_panel_off(dev); + } + intel_encoder->hot_plug = intel_dp_hot_plug; if (is_edp(intel_dp)) { |