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drm/i915: Try harder during dp pattern 1 link training

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Instead of going through the sequence just once, run through the whole
set up to 5 times to see if something can work. This isn't part of the
DP spec, but the BIOS seems to do it, and given that link training
failure is so bad, it seems reasonable to follow suit.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Keith Packard 2011-11-01 20:00:06 -07:00
parent 21264c638b
commit cdb0e95bf5
1 changed files with 18 additions and 7 deletions
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25
drivers/gpu/drm/i915/intel_dp.c
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@ -1581,7 +1581,7 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
int i;
uint8_t voltage;
bool clock_recovery = false;
int tries;
int voltage_tries, loop_tries;
u32 reg;
uint32_t DP = intel_dp->DP;
@ -1608,7 +1608,8 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
DP &= ~DP_LINK_TRAIN_MASK;
memset(intel_dp->train_set, 0, 4);
voltage = 0xff;
tries = 0;
voltage_tries = 0;
loop_tries = 0;
clock_recovery = false;
for (;;) {
/* Use intel_dp->train_set[0] to set the voltage and pre emphasis values */
@ -1651,16 +1652,26 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
for (i = 0; i < intel_dp->lane_count; i++)
if ((intel_dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
break;
if (i == intel_dp->lane_count)
break;
if (i == intel_dp->lane_count) {
++loop_tries;
if (loop_tries == 5) {
DRM_DEBUG_KMS("too many full retries, give up\n");
break;
}
memset(intel_dp->train_set, 0, 4);
voltage_tries = 0;
continue;
}
/* Check to see if we've tried the same voltage 5 times */
if ((intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
++tries;
if (tries == 5)
++voltage_tries;
if (voltage_tries == 5) {
DRM_DEBUG_KMS("too many voltage retries, give up\n");
break;
}
} else
tries = 0;
voltage_tries = 0;
voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
/* Compute new intel_dp->train_set as requested by target */