From: Clint Taylor <Clinton.A.Taylor@xxxxxxxxx>
The panel power sequencer on vlv doesn't appear to accept changes to its T12 power down duration during warm reboots. This change forces a delay for warm reboots to the T12 panel timing as defined in the VBT table for the connected panel.
Signed-off-by: Clint Taylor <clinton.a.taylor@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 43 ++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_drv.h | 1 +
2 files changed, 44 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 5ca68aa9..03ac64f 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -28,6 +28,8 @@
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/export.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_crtc_helper.h>
@@ -302,6 +304,39 @@ static u32 _pp_stat_reg(struct intel_dp *intel_dp)
return VLV_PIPE_PP_STATUS(vlv_power_sequencer_pipe(intel_dp));
}
+/* Reboot notifier handler to shutdown panel power to gaurantee T12 timing */
+static int edp_notify_handler(struct notifier_block *this, unsigned long code,
+ void *unused)
+{
+ struct intel_dp *intel_dp = container_of(this, typeof(* intel_dp),
+ edp_notifier);
+ struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+ struct drm_device *dev = intel_dig_port->base.base.dev;
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 pp;
+ u32 pp_ctrl_reg, pp_div_reg;
+ enum pipe pipe = vlv_power_sequencer_pipe(intel_dp);
+
+ if (!is_edp(intel_dp))
+ return 0;
+
+ if (IS_VALLEYVIEW(dev)) {
+ pp_ctrl_reg = VLV_PIPE_PP_CONTROL(pipe);
+ pp_div_reg = VLV_PIPE_PP_DIVISOR(pipe);
+ if (code == SYS_RESTART) {
+ pr_crit("eDP Notifier Handler\n");
+ pp = I915_READ(VLV_PIPE_PP_DIVISOR(pipe));
+ pp &= PP_REFERENCE_DIVIDER_MASK;
+ I915_WRITE(pp_div_reg , pp | 0x1F);
+ I915_WRITE(pp_ctrl_reg,
+ PANEL_UNLOCK_REGS | PANEL_POWER_OFF);
+ /* VBT entries are in tenths of uS convert to mS */
+ msleep(dev_priv->vbt.edp_pps.t11_t12 / 10);
+ }
+ }
+ return 0;
+}
+
static bool edp_have_panel_power(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
@@ -3344,6 +3379,10 @@ void intel_dp_encoder_destroy(struct drm_encoder *encoder)
mutex_lock(&dev->mode_config.mutex);
edp_panel_vdd_off_sync(intel_dp);
mutex_unlock(&dev->mode_config.mutex);
+ if (intel_dp->edp_notifier.notifier_call) {
+ unregister_reboot_notifier(&intel_dp->edp_notifier);
+ intel_dp->edp_notifier.notifier_call = NULL;
+ }
}
kfree(intel_dig_port);
}
@@ -3782,6 +3821,10 @@ intel_dp_init_connector(struct intel_digital_port *intel_dig_port,
if (is_edp(intel_dp)) {
intel_dp_init_panel_power_timestamps(intel_dp);
intel_dp_init_panel_power_sequencer(dev, intel_dp, &power_seq);
+ if (IS_VALLEYVIEW(dev)) {
+ intel_dp->edp_notifier.notifier_call = edp_notify_handler;
+ register_reboot_notifier(&intel_dp->edp_notifier);
+ }
}
intel_dp_aux_init(intel_dp, intel_connector);
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 328b1a7..1ea193a 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -512,6 +512,7 @@ struct intel_dp {
bool psr_setup_done;
bool use_tps3;
struct intel_connector *attached_connector;
+ struct notifier_block edp_notifier;
uint32_t (*get_aux_clock_divider)(struct intel_dp *dp, int index);
/*
--
1.7.9.5
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