From: Pallavi G <pallavi.g at intel.com>
Program few Tx buffer Swing control settings through DPIO.
Signed-off-by: Pallavi G <pallavi.g at intel.com>
Signed-off-by: Yogesh M <yogesh.mohan.marimuthu at intel.com>
Signed-off-by: Gajanan Bhat <gajanan.bhat at intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 114 ++++++++++++++++++++++++++++++++++++++-
1 file changed, 112 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 68d238d..03340fd 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1527,7 +1527,9 @@ intel_dp_voltage_max(struct intel_dp *intel_dp)
{
struct drm_device *dev = intel_dp_to_dev(intel_dp);
- if (IS_GEN7(dev) && is_cpu_edp(intel_dp))
+ if (IS_VALLEYVIEW(dev))
+ return DP_TRAIN_VOLTAGE_SWING_1200;
+ else if (IS_GEN7(dev) && is_cpu_edp(intel_dp))
return DP_TRAIN_VOLTAGE_SWING_800;
else if (HAS_PCH_CPT(dev) && !is_cpu_edp(intel_dp))
return DP_TRAIN_VOLTAGE_SWING_1200;
@@ -1552,7 +1554,19 @@ intel_dp_pre_emphasis_max(struct intel_dp *intel_dp, uint8_t voltage_swing)
default:
return DP_TRAIN_PRE_EMPHASIS_0;
}
- } else if (IS_GEN7(dev) && is_cpu_edp(intel_dp) && !IS_VALLEYVIEW(dev)) {
+ } else if (IS_VALLEYVIEW(dev)) {
+ switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
+ case DP_TRAIN_VOLTAGE_SWING_400:
+ return DP_TRAIN_PRE_EMPHASIS_9_5;
+ case DP_TRAIN_VOLTAGE_SWING_600:
+ return DP_TRAIN_PRE_EMPHASIS_6;
+ case DP_TRAIN_VOLTAGE_SWING_800:
+ return DP_TRAIN_PRE_EMPHASIS_3_5;
+ case DP_TRAIN_VOLTAGE_SWING_1200:
+ default:
+ return DP_TRAIN_PRE_EMPHASIS_0;
+ }
+ } else if (IS_GEN7(dev) && is_cpu_edp(intel_dp)) {
switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
case DP_TRAIN_VOLTAGE_SWING_400:
return DP_TRAIN_PRE_EMPHASIS_6;
@@ -1577,15 +1591,111 @@ intel_dp_pre_emphasis_max(struct intel_dp *intel_dp, uint8_t voltage_swing)
}
}
+static void vlv_set_vswing_pre_emphasis(struct intel_dp *intel_dp, uint8_t v,
+ uint8_t p)
+{
+ struct drm_device *dev = intel_dp_to_dev(intel_dp);
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ unsigned long Demph_reg_value, Preemph_reg_value,
+ Uniqtranscale_reg_value;
+ switch (p) {
+ case DP_TRAIN_PRE_EMPHASIS_0:
+ Preemph_reg_value = 0x0004000;
+ switch (v) {
+ case DP_TRAIN_VOLTAGE_SWING_400:
+ Demph_reg_value = 0x2B405555;
+ Uniqtranscale_reg_value = 0x552AB83A;
+ break;
+ case DP_TRAIN_VOLTAGE_SWING_600:
+ Demph_reg_value = 0x2B404040;
+ Uniqtranscale_reg_value = 0x5548B83A;
+ break;
+ case DP_TRAIN_VOLTAGE_SWING_800:
+ Demph_reg_value = 0x2B245555;
+ Uniqtranscale_reg_value = 0x5560B83A;
+ break;
+ case DP_TRAIN_VOLTAGE_SWING_1200:
+ Demph_reg_value = 0x2B405555;
+ Uniqtranscale_reg_value = 0x5598DA3A;
+ break;
+ default:
+ return;
+ }
+ break;
+ case DP_TRAIN_PRE_EMPHASIS_3_5:
+ Preemph_reg_value = 0x0002000;
+ switch (v) {
+ case DP_TRAIN_VOLTAGE_SWING_400:
+ Demph_reg_value = 0x2B404040;
+ Uniqtranscale_reg_value = 0x5552B83A;
+ break;
+ case DP_TRAIN_VOLTAGE_SWING_600:
+ Demph_reg_value = 0x2B404848;
+ Uniqtranscale_reg_value = 0x5580B83A;
+ break;
+ case DP_TRAIN_VOLTAGE_SWING_800:
+ Demph_reg_value = 0x2B404040;
+ Uniqtranscale_reg_value = 0x55ADDA3A;
+ break;
+ default:
+ return;
+ }
+ break;
+ case DP_TRAIN_PRE_EMPHASIS_6:
+ Preemph_reg_value = 0x0000000;
+ switch (v) {
+ case DP_TRAIN_VOLTAGE_SWING_400:
+ Demph_reg_value = 0x2B305555;
+ Uniqtranscale_reg_value = 0x5570B83A;
+ break;
+ case DP_TRAIN_VOLTAGE_SWING_600:
+ Demph_reg_value = 0x2B2B4040;
+ Uniqtranscale_reg_value = 0x55ADDA3A;
+ break;
+ default:
+ return;
+ }
+ break;
+ case DP_TRAIN_PRE_EMPHASIS_9_5:
+ Preemph_reg_value = 0x0006000;
+ switch (v) {
+ case DP_TRAIN_VOLTAGE_SWING_400:
+ Demph_reg_value = 0x1B405555;
+ Uniqtranscale_reg_value = 0x55ADDA3A;
+ break;
+ default:
+ return;
+ }
+ break;
+ default:
+ return;
+ }
+
+ /* eDP is only on port C */
+ mutex_lock(&dev_priv->dpio_lock);
+ intel_dpio_write(dev_priv, 0x8494, 0x00000000);
+ intel_dpio_write(dev_priv, 0x8490, Demph_reg_value);
+ intel_dpio_write(dev_priv, 0x8488, Uniqtranscale_reg_value);
+ intel_dpio_write(dev_priv, 0x848c, 0x0C782040);
+ intel_dpio_write(dev_priv, 0x842c, 0x00030000);
+ intel_dpio_write(dev_priv, 0x8424, Preemph_reg_value);
+ intel_dpio_write(dev_priv, 0x8494, 0x80000000);
+ mutex_unlock(&dev_priv->dpio_lock);
+}
+
static void
intel_get_adjust_train(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_STATUS_SIZE])
{
+ struct drm_device *dev = intel_dp_to_dev(intel_dp);
uint8_t v = 0;
uint8_t p = 0;
int lane;
uint8_t voltage_max;
uint8_t preemph_max;
+ if (IS_VALLEYVIEW(dev))
+ vlv_set_vswing_pre_emphasis(intel_dp, v, p);
+
for (lane = 0; lane < intel_dp->lane_count; lane++) {
uint8_t this_v = drm_dp_get_adjust_request_voltage(link_status, lane);
uint8_t this_p = drm_dp_get_adjust_request_pre_emphasis(link_status, lane);
--
1.7.9.5
