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dp: dptx: The maximum iteration count for channel equalization is fixed at 5.

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Signed-off-by: Andrei-Liviu Simion <andrei.simion@xilinx.com>
This commit is contained in:
Andrei-Liviu Simion 2015-01-13 16:18:07 -08:00 • committed by Nava kishore Manne
parent 6cdf439d02
commit 9c570b85fa
1 changed files with 7 additions and 11 deletions
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18
XilinxProcessorIPLib/drivers/dp/src/xdptx.c
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@ -118,7 +118,7 @@ typedef struct {
static u32 XDptx_RunTraining(XDptx *InstancePtr); static u32 XDptx_RunTraining(XDptx *InstancePtr);
static XDptx_TrainingState XDptx_TrainingStateClockRecovery(XDptx *InstancePtr); static XDptx_TrainingState XDptx_TrainingStateClockRecovery(XDptx *InstancePtr);
static XDptx_TrainingState XDptx_TrainingStateChannelEqualization( static XDptx_TrainingState XDptx_TrainingStateChannelEqualization(
XDptx *InstancePtr, u32 MaxIterations); XDptx *InstancePtr);
static XDptx_TrainingState XDptx_TrainingStateAdjustLinkRate( static XDptx_TrainingState XDptx_TrainingStateAdjustLinkRate(
XDptx *InstancePtr); XDptx *InstancePtr);
static XDptx_TrainingState XDptx_TrainingStateAdjustLaneCount( static XDptx_TrainingState XDptx_TrainingStateAdjustLaneCount(
@ -1436,7 +1436,7 @@ static u32 XDptx_RunTraining(XDptx *InstancePtr)
break; break;
case XDPTX_TS_CHANNEL_EQUALIZATION: case XDPTX_TS_CHANNEL_EQUALIZATION:
TrainingState = XDptx_TrainingStateChannelEqualization( TrainingState = XDptx_TrainingStateChannelEqualization(
InstancePtr, 5); InstancePtr);
break; break;
case XDPTX_TS_ADJUST_LINK_RATE: case XDPTX_TS_ADJUST_LINK_RATE:
TrainingState = XDptx_TrainingStateAdjustLinkRate( TrainingState = XDptx_TrainingStateAdjustLinkRate(
@ -1589,7 +1589,7 @@ static XDptx_TrainingState XDptx_TrainingStateClockRecovery(XDptx *InstancePtr)
* 1) Transmit training pattern 2 (or 3) over the main link with symbol * 1) Transmit training pattern 2 (or 3) over the main link with symbol
* scrambling disabled. * scrambling disabled.
* 2) The channel equalization loop. If channel equalization is * 2) The channel equalization loop. If channel equalization is
* unsuccessful after MaxIterations loop iterations, return. * unsuccessful after 5 loop iterations, return.
* 2a) Wait for at least the period of time specified in the RX device's * 2a) Wait for at least the period of time specified in the RX device's
* DisplayPort Configuration Data (DPCD) register, * DisplayPort Configuration Data (DPCD) register,
* TRAINING_AUX_RD_INTERVAL. * TRAINING_AUX_RD_INTERVAL.
@ -1604,23 +1604,19 @@ static XDptx_TrainingState XDptx_TrainingStateClockRecovery(XDptx *InstancePtr)
* section 3.5.1.2.2 of the DisplayPort 1.2a specification document. * section 3.5.1.2.2 of the DisplayPort 1.2a specification document.
* *
* @param InstancePtr is a pointer to the XDptx instance. * @param InstancePtr is a pointer to the XDptx instance.
* @param MaxIterations is the maximum number of times to loop through the
* clock recovery sequence before down-shifting to a reduced data
* rate or a reduced number of lanes.
* *
* @return The next training state: * @return The next training state:
* - XDPTX_TS_SUCCESS if training succeeded. * - XDPTX_TS_SUCCESS if training succeeded.
* - XDPTX_TS_FAILURE if writing the drive settings to the RX * - XDPTX_TS_FAILURE if writing the drive settings to the RX
* device was unsuccesful. * device was unsuccesful.
* - XDPTX_TS_ADJUST_LINK_RATE if, after MaxIterations loop * - XDPTX_TS_ADJUST_LINK_RATE if, after 5 loop iterations, the
* iterations, the channel equalization sequence did not complete * channel equalization sequence did not complete successfully.
* successfully.
* *
* @note None. * @note None.
* *
*******************************************************************************/ *******************************************************************************/
static XDptx_TrainingState XDptx_TrainingStateChannelEqualization( static XDptx_TrainingState XDptx_TrainingStateChannelEqualization(
XDptx *InstancePtr, u32 MaxIterations) XDptx *InstancePtr)
{ {
u32 Status; u32 Status;
u32 DelayUs; u32 DelayUs;
@ -1649,7 +1645,7 @@ static XDptx_TrainingState XDptx_TrainingStateChannelEqualization(
return XDPTX_TS_FAILURE; return XDPTX_TS_FAILURE;
} }
while (IterationCount < MaxIterations) { while (IterationCount < 5) {
/* Wait delay specified in TRAINING_AUX_RD_INTERVAL. */ /* Wait delay specified in TRAINING_AUX_RD_INTERVAL. */
XDptx_WaitUs(InstancePtr, DelayUs); XDptx_WaitUs(InstancePtr, DelayUs);