UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Jesse Barnes 2010-10-07 16:01:21 -07:00 committed by Chris Wilson
parent 8088699f02
commit 896673836b
2 changed files with 21 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -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;

20
drivers/gpu/drm/i915/intel_dp.c
View File

@ -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)) {