From 9059009185319445fc9931091c2ed64ac199e356 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Sat, 18 Jul 2015 04:16:45 +0200 Subject: ddr: altera: Clean up rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase_sweep_dq_in_delay() part 1 Start cleaning up this function. In the first part, just fix the incorrectly broken debug strings and fix return value to respect the common convention. Signed-off-by: Marek Vasut --- drivers/ddr/altera/sequencer.c | 61 +++++++++++++++++++++--------------------- 1 file changed, 30 insertions(+), 31 deletions(-) (limited to 'drivers/ddr/altera/sequencer.c') diff --git a/drivers/ddr/altera/sequencer.c b/drivers/ddr/altera/sequencer.c index 8674a05..c33a12a 100644 --- a/drivers/ddr/altera/sequencer.c +++ b/drivers/ddr/altera/sequencer.c @@ -1770,57 +1770,59 @@ static uint32_t rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase(uint32_t grp) * Try rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase across different * dq_in_delay values */ -static uint32_t +static int rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase_sweep_dq_in_delay (uint32_t write_group, uint32_t read_group, uint32_t test_bgn) { - uint32_t found; - uint32_t i; - uint32_t p; - uint32_t d; - uint32_t r; - - const uint32_t delay_step = IO_IO_IN_DELAY_MAX / - (RW_MGR_MEM_DQ_PER_READ_DQS-1); - /* we start at zero, so have one less dq to devide among */ + /* We start at zero, so have one less dq to devide among */ + const u32 delay_step = IO_IO_IN_DELAY_MAX / + (RW_MGR_MEM_DQ_PER_READ_DQS - 1); + int found; + u32 i, p, d, r; - debug("%s:%d (%u,%u,%u)", __func__, __LINE__, write_group, read_group, - test_bgn); - - /* try different dq_in_delays since the dq path is shorter than dqs */ + debug("%s:%d (%u,%u,%u)\n", __func__, __LINE__, + write_group, read_group, test_bgn); + /* Try different dq_in_delays since the DQ path is shorter than DQS. */ for (r = 0; r < RW_MGR_MEM_NUMBER_OF_RANKS; r += NUM_RANKS_PER_SHADOW_REG) { - for (i = 0, p = test_bgn, d = 0; i < RW_MGR_MEM_DQ_PER_READ_DQS; i++, p++, d += delay_step) { - debug_cond(DLEVEL == 1, "%s:%d rw_mgr_mem_calibrate_\ - vfifo_find_dqs_", __func__, __LINE__); - debug_cond(DLEVEL == 1, "en_phase_sweep_dq_in_delay: g=%u/%u ", - write_group, read_group); - debug_cond(DLEVEL == 1, "r=%u, i=%u p=%u d=%u\n", r, i , p, d); + for (i = 0, p = test_bgn, d = 0; + i < RW_MGR_MEM_DQ_PER_READ_DQS; + i++, p++, d += delay_step) { + debug_cond(DLEVEL == 1, + "%s:%d: g=%u/%u r=%u i=%u p=%u d=%u\n", + __func__, __LINE__, write_group, read_group, + r, i, p, d); + scc_mgr_set_dq_in_delay(p, d); scc_mgr_load_dq(p); } + writel(0, &sdr_scc_mgr->update); } found = rw_mgr_mem_calibrate_vfifo_find_dqs_en_phase(read_group); - debug_cond(DLEVEL == 1, "%s:%d rw_mgr_mem_calibrate_vfifo_find_dqs_\ - en_phase_sweep_dq", __func__, __LINE__); - debug_cond(DLEVEL == 1, "_in_delay: g=%u/%u found=%u; Reseting delay \ - chain to zero\n", write_group, read_group, found); + debug_cond(DLEVEL == 1, + "%s:%d: g=%u/%u found=%u; Reseting delay chain to zero\n", + __func__, __LINE__, write_group, read_group, found); for (r = 0; r < RW_MGR_MEM_NUMBER_OF_RANKS; r += NUM_RANKS_PER_SHADOW_REG) { - for (i = 0, p = test_bgn; i < RW_MGR_MEM_DQ_PER_READ_DQS; - i++, p++) { + for (i = 0, p = test_bgn; + i < RW_MGR_MEM_DQ_PER_READ_DQS; + i++, p++) { scc_mgr_set_dq_in_delay(p, 0); scc_mgr_load_dq(p); } + writel(0, &sdr_scc_mgr->update); } - return found; + if (!found) + return -EINVAL; + + return 0; } /* per-bit deskew DQ and center */ @@ -2258,10 +2260,7 @@ static int rw_mgr_mem_calibrate_dqs_enable_calibration(const u32 rw_group, */ 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; + return ret; } /** -- cgit v1.1