From: Paulo Zanoni <paulo.r.zanoni at intel.com>
So we can de-duplicate code that's inside intel_dp_start_link_train
and intel_dp_complete_link_train.
V2: Rebase since patch 3/5 was discarded.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
drivers/gpu/drm/i915/intel_dp.c | 69 ++++++++++++++++++++---------------------
1 file changed, 33 insertions(+), 36 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index b2130bc..75073cc 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1587,7 +1587,7 @@ intel_get_adjust_train(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_ST
}
static uint32_t
-intel_dp_signal_levels(uint8_t train_set)
+intel_gen4_signal_levels(uint8_t train_set)
{
uint32_t signal_levels = 0;
@@ -1685,7 +1685,7 @@ intel_gen7_edp_signal_levels(uint8_t train_set)
/* Gen7.5's (HSW) DP voltage swing and pre-emphasis control */
static uint32_t
-intel_dp_signal_levels_hsw(uint8_t train_set)
+intel_hsw_signal_levels(uint8_t train_set)
{
int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK |
DP_TRAIN_PRE_EMPHASIS_MASK);
@@ -1717,6 +1717,34 @@ intel_dp_signal_levels_hsw(uint8_t train_set)
}
}
+/* Properly updates "DP" with the correct signal levels. */
+static void
+intel_dp_set_signal_levels(struct intel_dp *intel_dp, uint32_t *DP)
+{
+ struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
+ struct drm_device *dev = intel_dig_port->base.base.dev;
+ uint32_t signal_levels, mask;
+ uint8_t train_set = intel_dp->train_set[0];
+
+ if (IS_HASWELL(dev)) {
+ signal_levels = intel_hsw_signal_levels(train_set);
+ mask = DDI_BUF_EMP_MASK;
+ } else if (IS_GEN7(dev) && is_cpu_edp(intel_dp) && !IS_VALLEYVIEW(dev)) {
+ signal_levels = intel_gen7_edp_signal_levels(train_set);
+ mask = EDP_LINK_TRAIN_VOL_EMP_MASK_IVB;
+ } else if (IS_GEN6(dev) && is_cpu_edp(intel_dp)) {
+ signal_levels = intel_gen6_edp_signal_levels(train_set);
+ mask = EDP_LINK_TRAIN_VOL_EMP_MASK_SNB;
+ } else {
+ signal_levels = intel_gen4_signal_levels(train_set);
+ mask = DP_VOLTAGE_MASK | DP_PRE_EMPHASIS_MASK;
+ }
+
+ DRM_DEBUG_KMS("Using signal levels %08x\n", signal_levels);
+
+ *DP = (*DP & ~mask) | signal_levels;
+}
+
static bool
intel_dp_set_link_train(struct intel_dp *intel_dp,
uint32_t dp_reg_value,
@@ -1853,24 +1881,8 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
for (;;) {
/* Use intel_dp->train_set[0] to set the voltage and pre emphasis values */
uint8_t link_status[DP_LINK_STATUS_SIZE];
- uint32_t signal_levels;
-
- if (IS_HASWELL(dev)) {
- signal_levels = intel_dp_signal_levels_hsw(
- intel_dp->train_set[0]);
- DP = (DP & ~DDI_BUF_EMP_MASK) | signal_levels;
- } else if (IS_GEN7(dev) && is_cpu_edp(intel_dp) && !IS_VALLEYVIEW(dev)) {
- signal_levels = intel_gen7_edp_signal_levels(intel_dp->train_set[0]);
- DP = (DP & ~EDP_LINK_TRAIN_VOL_EMP_MASK_IVB) | signal_levels;
- } else if (IS_GEN6(dev) && is_cpu_edp(intel_dp)) {
- signal_levels = intel_gen6_edp_signal_levels(intel_dp->train_set[0]);
- DP = (DP & ~EDP_LINK_TRAIN_VOL_EMP_MASK_SNB) | signal_levels;
- } else {
- signal_levels = intel_dp_signal_levels(intel_dp->train_set[0]);
- DP = (DP & ~(DP_VOLTAGE_MASK|DP_PRE_EMPHASIS_MASK)) | signal_levels;
- }
- DRM_DEBUG_KMS("training pattern 1 signal levels %08x\n",
- signal_levels);
+
+ intel_dp_set_signal_levels(intel_dp, &DP);
/* Set training pattern 1 */
if (!intel_dp_set_link_train(intel_dp, DP,
@@ -1926,7 +1938,6 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
void
intel_dp_complete_link_train(struct intel_dp *intel_dp)
{
- struct drm_device *dev = intel_dp_to_dev(intel_dp);
bool channel_eq = false;
int tries, cr_tries;
uint32_t DP = intel_dp->DP;
@@ -1936,8 +1947,6 @@ intel_dp_complete_link_train(struct intel_dp *intel_dp)
cr_tries = 0;
channel_eq = false;
for (;;) {
- /* Use intel_dp->train_set[0] to set the voltage and pre emphasis values */
- uint32_t signal_levels;
uint8_t link_status[DP_LINK_STATUS_SIZE];
if (cr_tries > 5) {
@@ -1946,19 +1955,7 @@ intel_dp_complete_link_train(struct intel_dp *intel_dp)
break;
}
- if (IS_HASWELL(dev)) {
- signal_levels = intel_dp_signal_levels_hsw(intel_dp->train_set[0]);
- DP = (DP & ~DDI_BUF_EMP_MASK) | signal_levels;
- } else if (IS_GEN7(dev) && is_cpu_edp(intel_dp) && !IS_VALLEYVIEW(dev)) {
- signal_levels = intel_gen7_edp_signal_levels(intel_dp->train_set[0]);
- DP = (DP & ~EDP_LINK_TRAIN_VOL_EMP_MASK_IVB) | signal_levels;
- } else if (IS_GEN6(dev) && is_cpu_edp(intel_dp)) {
- signal_levels = intel_gen6_edp_signal_levels(intel_dp->train_set[0]);
- DP = (DP & ~EDP_LINK_TRAIN_VOL_EMP_MASK_SNB) | signal_levels;
- } else {
- signal_levels = intel_dp_signal_levels(intel_dp->train_set[0]);
- DP = (DP & ~(DP_VOLTAGE_MASK|DP_PRE_EMPHASIS_MASK)) | signal_levels;
- }
+ intel_dp_set_signal_levels(intel_dp, &DP);
/* channel eq pattern */
if (!intel_dp_set_link_train(intel_dp, DP,
--
1.7.11.7
