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Message-ID: <20240507093056.3921-7-diogo.ivo@tecnico.ulisboa.pt>
Date: Tue, 7 May 2024 10:30:49 +0100
From: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
To: krzysztof.kozlowski@...aro.org,
thierry.reding@...il.com,
jonathanh@...dia.com,
linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
Subject: [PATCH RESEND v3 6/7] memory: tegra: Move compare/update current delay values to a function
Separate the comparison/updating of the measured delay values with the
values currently programmed into a separate function to simplify the
code.
Signed-off-by: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
---
Changes in v2:
- Correct return value of update_clock_tree_delay() to bool
drivers/memory/tegra/tegra210-emc-cc-r21021.c | 86 +++++++++----------
1 file changed, 39 insertions(+), 47 deletions(-)
diff --git a/drivers/memory/tegra/tegra210-emc-cc-r21021.c b/drivers/memory/tegra/tegra210-emc-cc-r21021.c
index 9262da658189..a8a217502f0c 100644
--- a/drivers/memory/tegra/tegra210-emc-cc-r21021.c
+++ b/drivers/memory/tegra/tegra210-emc-cc-r21021.c
@@ -113,19 +113,35 @@ enum {
#define __MOVAVG(timing, dev) \
((timing)->ptfv_list[(dev)])
-static u32 update_clock_tree_delay(struct tegra210_emc *emc, int type)
+static bool tegra210_emc_compare_update_delay(struct tegra210_emc_timing *timing,
+ u32 measured, u32 idx)
+{
+ u32 *curr = &timing->current_dram_clktree[idx];
+ u32 rate_mhz = timing->rate / 1000;
+ u32 tmdel;
+
+ tmdel = abs(*curr - measured);
+
+ if (tmdel * 128 * rate_mhz / 1000000 > timing->tree_margin) {
+ *curr = measured;
+ return true;
+ }
+
+ return false;
+}
+
+static bool update_clock_tree_delay(struct tegra210_emc *emc, int type)
{
bool periodic_training_update = type == PERIODIC_TRAINING_UPDATE;
struct tegra210_emc_timing *last = emc->last;
struct tegra210_emc_timing *next = emc->next;
u32 last_timing_rate_mhz = last->rate / 1000;
- u32 next_timing_rate_mhz = next->rate / 1000;
bool dvfs_update = type == DVFS_UPDATE;
- s32 tdel = 0, tmdel = 0, adel = 0;
bool dvfs_pt1 = type == DVFS_PT1;
u32 temp[2][2], value, delay_us;
unsigned long cval = 0;
unsigned int c, d, idx;
+ bool over = false;
if (dvfs_pt1 || periodic_training_update) {
delay_us = tegra210_emc_actual_osc_clocks(last->run_clocks);
@@ -174,17 +190,9 @@ static u32 update_clock_tree_delay(struct tegra210_emc *emc, int type)
else if (periodic_training_update)
__WEIGHTED_UPDATE_PTFV(idx, cval);
- if (dvfs_update || periodic_training_update) {
- tdel = next->current_dram_clktree[idx] -
- __MOVAVG_AC(next, idx);
- tmdel = (tdel < 0) ? -1 * tdel : tdel;
- adel = tmdel;
-
- if (tmdel * 128 * next_timing_rate_mhz / 1000000 >
- next->tree_margin)
- next->current_dram_clktree[idx] =
- __MOVAVG_AC(next, idx);
- }
+ if (dvfs_update || periodic_training_update)
+ over |= tegra210_emc_compare_update_delay(next,
+ __MOVAVG_AC(next, idx), idx);
/* C[c]D[d]U[1] */
idx++;
@@ -202,34 +210,25 @@ static u32 update_clock_tree_delay(struct tegra210_emc *emc, int type)
else if (periodic_training_update)
__WEIGHTED_UPDATE_PTFV(idx, cval);
- if (dvfs_update || periodic_training_update) {
- tdel = next->current_dram_clktree[idx] -
- __MOVAVG_AC(next, idx);
- tmdel = (tdel < 0) ? -1 * tdel : tdel;
-
- if (tmdel > adel)
- adel = tmdel;
-
- if (tmdel * 128 * next_timing_rate_mhz / 1000000 >
- next->tree_margin)
- next->current_dram_clktree[idx] =
- __MOVAVG_AC(next, idx);
- }
+ if (dvfs_update || periodic_training_update)
+ over |= tegra210_emc_compare_update_delay(next,
+ __MOVAVG_AC(next, idx), idx);
}
}
- return adel;
+ return over;
}
-static u32 periodic_compensation_handler(struct tegra210_emc *emc, u32 type,
- struct tegra210_emc_timing *last,
- struct tegra210_emc_timing *next)
+static bool periodic_compensation_handler(struct tegra210_emc *emc, u32 type,
+ struct tegra210_emc_timing *last,
+ struct tegra210_emc_timing *next)
{
#define __COPY_EMA(nt, lt, dev) \
({ __MOVAVG(nt, dev) = __MOVAVG(lt, dev) * \
(nt)->ptfv_list[PTFV_DVFS_SAMPLES_INDEX]; })
- u32 i, adel = 0, samples = next->ptfv_list[PTFV_DVFS_SAMPLES_INDEX];
+ u32 i, samples = next->ptfv_list[PTFV_DVFS_SAMPLES_INDEX];
+ bool over = false;
u32 idx;
if (!next->periodic_training)
@@ -253,23 +252,23 @@ static u32 periodic_compensation_handler(struct tegra210_emc *emc, u32 type,
for (i = 0; i < samples; i++) {
/* Generate next sample of data. */
- adel = update_clock_tree_delay(emc, DVFS_PT1);
+ update_clock_tree_delay(emc, DVFS_PT1);
}
}
/* Do the division part of the moving average */
- adel = update_clock_tree_delay(emc, DVFS_UPDATE);
+ over = update_clock_tree_delay(emc, DVFS_UPDATE);
}
if (type == PERIODIC_TRAINING_SEQUENCE)
- adel = update_clock_tree_delay(emc, PERIODIC_TRAINING_UPDATE);
+ over = update_clock_tree_delay(emc, PERIODIC_TRAINING_UPDATE);
- return adel;
+ return over;
}
static u32 tegra210_emc_r21021_periodic_compensation(struct tegra210_emc *emc)
{
- u32 emc_cfg, emc_cfg_o, emc_cfg_update, del, value;
+ u32 emc_cfg, emc_cfg_o, emc_cfg_update, value;
static const u32 list[] = {
EMC_PMACRO_OB_DDLL_LONG_DQ_RANK0_0,
EMC_PMACRO_OB_DDLL_LONG_DQ_RANK0_1,
@@ -327,15 +326,12 @@ static u32 tegra210_emc_r21021_periodic_compensation(struct tegra210_emc *emc)
* 4. Check delta wrt previous values (save value if margin
* exceeds what is set in table).
*/
- del = periodic_compensation_handler(emc,
- PERIODIC_TRAINING_SEQUENCE,
- last, last);
-
+ if (periodic_compensation_handler(emc, PERIODIC_TRAINING_SEQUENCE,
+ last, last)) {
/*
* 5. Apply compensation w.r.t. trained values (if clock tree
* has drifted more than the set margin).
*/
- if (last->tree_margin < ((del * 128 * (last->rate / 1000)) / 1000000)) {
for (i = 0; i < items; i++) {
value = tegra210_emc_compensate(last, list[i]);
emc_dbg(emc, EMA_WRITES, "0x%08x <= 0x%08x\n",
@@ -516,11 +512,7 @@ static void tegra210_emc_r21021_set_clock(struct tegra210_emc *emc, u32 clksrc)
EMC_EMC_STATUS_DRAM_IN_SELF_REFRESH_MASK,
0);
- value = periodic_compensation_handler(emc, DVFS_SEQUENCE, fake,
- next);
- value = (value * 128 * next->rate / 1000) / 1000000;
-
- if (next->periodic_training && value > next->tree_margin)
+ if (periodic_compensation_handler(emc, DVFS_SEQUENCE, fake, next))
compensate_trimmer_applicable = true;
}
--
2.44.0
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