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ddr: altera: Extract DQS enable calibration from rw_mgr_mem_calibrate_vfifo()

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Just extract this piece of functionality into separate function
to make the code better separated. This matches the division in
Altera documentation, Altera EMI_RM 2015.05.04 , section 1, the
UniPHY Calibration Stages.

Signed-off-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Marek Vasut 2015-07-18 02:57:32 +02:00
parent 04372fb897
commit f09da11e6b
1 changed files with 29 additions and 3 deletions
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32
drivers/ddr/altera/sequencer.c
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@ -2234,6 +2234,31 @@ static int rw_mgr_mem_calibrate_guaranteed_write(const u32 rw_group,
return 0; return 0;
} }
/**
* rw_mgr_mem_calibrate_dqs_enable_calibration() - DQS Enable Calibration
* @rw_group: Read/Write Group
* @test_bgn: Rank at which the test begins
*
* DQS enable calibration ensures reliable capture of the DQ signal without
* glitches on the DQS line.
*/
static int rw_mgr_mem_calibrate_dqs_enable_calibration(const u32 rw_group,
const u32 test_bgn)
{
int ret;
/*
* Altera EMI_RM 2015.05.04 :: Figure 1-27
* DQS and DQS Eanble Signal Relationships.
*/
ret = rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase_sweep_dq_in_delay(
rw_group, rw_group, test_bgn);
if (!ret) /* FIXME: 0 means failure in this old code :-( */
return -EIO;
return 0;
}
/** /**
* rw_mgr_mem_calibrate_vfifo() - Calibrate the read valid prediction FIFO * rw_mgr_mem_calibrate_vfifo() - Calibrate the read valid prediction FIFO
* @rw_group: Read/Write Group * @rw_group: Read/Write Group
@ -2289,9 +2314,10 @@ static int rw_mgr_mem_calibrate_vfifo(const u32 rw_group, const u32 test_bgn)
if (ret) if (ret)
break; break;
/* case:56390 */ /* 2) DQS Enable Calibration */
if (!rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase_sweep_dq_in_delay ret = rw_mgr_mem_calibrate_dqs_enable_calibration(rw_group,
(rw_group, rw_group, test_bgn)) { test_bgn);
if (ret) {
failed_substage = CAL_SUBSTAGE_DQS_EN_PHASE; failed_substage = CAL_SUBSTAGE_DQS_EN_PHASE;
continue; continue;
} }