linux-kernel - [PATCH v4 2/7] memory: tegra: Move DQSOSC measurement to common place

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Message-Id: <20240704-tegra210_emcfreq-v4-2-3e450503c555@tecnico.ulisboa.pt>
Date: Thu, 04 Jul 2024 12:31:21 +0100
From: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
To: Krzysztof Kozlowski <krzk@...nel.org>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Jonathan Hunter <jonathanh@...dia.com>
Cc: linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org, 
 Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
Subject: [PATCH v4 2/7] memory: tegra: Move DQSOSC measurement to common
 place

Move the calls that instruct the RAM to capture its clock tree delays
to update_clock_tree_delay() in order to avoid code duplication.

Signed-off-by: Diogo Ivo <diogo.ivo@...nico.ulisboa.pt>
---
 drivers/memory/tegra/tegra210-emc-cc-r21021.c | 25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

diff --git a/drivers/memory/tegra/tegra210-emc-cc-r21021.c b/drivers/memory/tegra/tegra210-emc-cc-r21021.c
index 9ec49ced8f91..a3525f3b8145 100644
--- a/drivers/memory/tegra/tegra210-emc-cc-r21021.c
+++ b/drivers/memory/tegra/tegra210-emc-cc-r21021.c
@@ -123,10 +123,19 @@ static u32 update_clock_tree_delay(struct tegra210_emc *emc, int type)
 	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;
-	u32 temp[2][2], value;
 	unsigned int i;
 
+	if (dvfs_pt1 || periodic_training_update) {
+		delay_us = tegra210_emc_actual_osc_clocks(last->run_clocks);
+		delay_us *= 1000;
+		delay_us = 2 + (delay_us / last->rate);
+
+		tegra210_emc_start_periodic_compensation(emc);
+		udelay(delay_us);
+	}
+
 	/*
 	 * Dev0 MSB.
 	 */
@@ -409,11 +418,6 @@ static u32 periodic_compensation_handler(struct tegra210_emc *emc, u32 type,
 	   (nt)->ptfv_list[PTFV_DVFS_SAMPLES_INDEX]; })
 
 	u32 i, adel = 0, samples = next->ptfv_list[PTFV_DVFS_SAMPLES_INDEX];
-	u32 delay;
-
-	delay = tegra210_emc_actual_osc_clocks(last->run_clocks);
-	delay *= 1000;
-	delay = 2 + (delay / last->rate);
 
 	if (!next->periodic_training)
 		return 0;
@@ -447,9 +451,6 @@ static u32 periodic_compensation_handler(struct tegra210_emc *emc, u32 type,
 			__MOVAVG(next, C1D1U1) = 0;
 
 			for (i = 0; i < samples; i++) {
-				tegra210_emc_start_periodic_compensation(emc);
-				udelay(delay);
-
 				/*
 				 * Generate next sample of data.
 				 */
@@ -465,12 +466,8 @@ static u32 periodic_compensation_handler(struct tegra210_emc *emc, u32 type,
 		adel = update_clock_tree_delay(emc, DVFS_UPDATE);
 	}
 
-	if (type == PERIODIC_TRAINING_SEQUENCE) {
-		tegra210_emc_start_periodic_compensation(emc);
-		udelay(delay);
-
+	if (type == PERIODIC_TRAINING_SEQUENCE)
 		adel = update_clock_tree_delay(emc, PERIODIC_TRAINING_UPDATE);
-	}
 
 	return adel;
 }

-- 
2.45.2