forked from Minki/linux
drm/i915/dp: manage sink power state if possible
On sinks with a DPCD rev of 1.1 or greater, we can send sink power management commands to address 0x600 per section 5.1.5 of the DisplayPort 1.1a spec. Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Reviewed-by: Keith Packard <keithp@keithp.com> Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
parent
df0c237d12
commit
c7ad381078
@ -942,11 +942,44 @@ static void ironlake_edp_pll_off(struct drm_encoder *encoder)
|
||||
udelay(200);
|
||||
}
|
||||
|
||||
/* If the sink supports it, try to set the power state appropriately */
|
||||
static void intel_dp_sink_dpms(struct intel_dp *intel_dp, int mode)
|
||||
{
|
||||
int ret, i;
|
||||
|
||||
/* Should have a valid DPCD by this point */
|
||||
if (intel_dp->dpcd[DP_DPCD_REV] < 0x11)
|
||||
return;
|
||||
|
||||
if (mode != DRM_MODE_DPMS_ON) {
|
||||
ret = intel_dp_aux_native_write_1(intel_dp, DP_SET_POWER,
|
||||
DP_SET_POWER_D3);
|
||||
if (ret != 1)
|
||||
DRM_DEBUG_DRIVER("failed to write sink power state\n");
|
||||
} else {
|
||||
/*
|
||||
* When turning on, we need to retry for 1ms to give the sink
|
||||
* time to wake up.
|
||||
*/
|
||||
for (i = 0; i < 3; i++) {
|
||||
ret = intel_dp_aux_native_write_1(intel_dp,
|
||||
DP_SET_POWER,
|
||||
DP_SET_POWER_D0);
|
||||
if (ret == 1)
|
||||
break;
|
||||
msleep(1);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void intel_dp_prepare(struct drm_encoder *encoder)
|
||||
{
|
||||
struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
|
||||
struct drm_device *dev = encoder->dev;
|
||||
|
||||
/* Wake up the sink first */
|
||||
intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
|
||||
|
||||
if (is_edp(intel_dp)) {
|
||||
ironlake_edp_backlight_off(dev);
|
||||
ironlake_edp_panel_off(dev);
|
||||
@ -990,6 +1023,7 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
|
||||
if (mode != DRM_MODE_DPMS_ON) {
|
||||
if (is_edp(intel_dp))
|
||||
ironlake_edp_backlight_off(dev);
|
||||
intel_dp_sink_dpms(intel_dp, mode);
|
||||
intel_dp_link_down(intel_dp);
|
||||
if (is_edp(intel_dp))
|
||||
ironlake_edp_panel_off(dev);
|
||||
@ -998,6 +1032,7 @@ intel_dp_dpms(struct drm_encoder *encoder, int mode)
|
||||
} else {
|
||||
if (is_edp(intel_dp))
|
||||
ironlake_edp_panel_vdd_on(intel_dp);
|
||||
intel_dp_sink_dpms(intel_dp, mode);
|
||||
if (!(dp_reg & DP_PORT_EN)) {
|
||||
intel_dp_start_link_train(intel_dp);
|
||||
if (is_edp(intel_dp)) {
|
||||
|
Loading…
Reference in New Issue
Block a user