From 896673836b8c55b75e7d7d2741aaaadff0c6a038 Mon Sep 17 00:00:00 2001 From: Jesse Barnes Date: Thu, 7 Oct 2010 16:01:21 -0700 Subject: [PATCH] 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 Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/intel_dp.c | 20 ++++++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 6d49a9f5c2b1..84e33aeececd 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -350,6 +350,7 @@ typedef struct drm_i915_private { int bpp; struct edp_power_seq pps; } edp; + bool no_aux_handshake; struct notifier_block lid_notifier; diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 944dfe199f6e..7fa828275e4a 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)) { -- 2.34.1