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From: Dmitry Osipenko <digetx@gmail.com>
To: Rob Herring <robh+dt@kernel.org>,
	Michael Turquette <mturquette@baylibre.com>,
	Joseph Lo <josephl@nvidia.com>,
	Thierry Reding <thierry.reding@gmail.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	Peter De Schrijver <pdeschrijver@nvidia.com>,
	Prashant Gaikwad <pgaikwad@nvidia.com>,
	Stephen Boyd <sboyd@kernel.org>
Cc: devicetree@vger.kernel.org, linux-clk@vger.kernel.org,
	linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v10 03/15] memory: tegra20-emc: Adapt for clock driver changes
Date: Mon, 12 Aug 2019 00:00:31 +0300
Message-ID: <20190811210043.20122-4-digetx@gmail.com> (raw)
In-Reply-To: <20190811210043.20122-1-digetx@gmail.com>

Now Terga20 and Tegra30 EMC drivers should provide clock-rounding
functionality using the new Tegra-CLK driver API.

Acked-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/memory/tegra/tegra20-emc.c | 50 ++++++++++++++++++++++++++++--
 1 file changed, 48 insertions(+), 2 deletions(-)

diff --git a/drivers/memory/tegra/tegra20-emc.c b/drivers/memory/tegra/tegra20-emc.c
index da8fa592b071..b519f02b0ee9 100644
--- a/drivers/memory/tegra/tegra20-emc.c
+++ b/drivers/memory/tegra/tegra20-emc.c
@@ -6,6 +6,7 @@
  */
 
 #include <linux/clk.h>
+#include <linux/clk/tegra.h>
 #include <linux/completion.h>
 #include <linux/err.h>
 #include <linux/interrupt.h>
@@ -421,6 +422,44 @@ static int emc_setup_hw(struct tegra_emc *emc)
 	return 0;
 }
 
+static long emc_round_rate(unsigned long rate,
+			   unsigned long min_rate,
+			   unsigned long max_rate,
+			   void *arg)
+{
+	struct emc_timing *timing = NULL;
+	struct tegra_emc *emc = arg;
+	unsigned int i;
+
+	min_rate = min(min_rate, emc->timings[emc->num_timings - 1].rate);
+
+	for (i = 0; i < emc->num_timings; i++) {
+		if (emc->timings[i].rate < rate && i != emc->num_timings - 1)
+			continue;
+
+		if (emc->timings[i].rate > max_rate) {
+			i = max(i, 1u) - 1;
+
+			if (emc->timings[i].rate < min_rate)
+				break;
+		}
+
+		if (emc->timings[i].rate < min_rate)
+			continue;
+
+		timing = &emc->timings[i];
+		break;
+	}
+
+	if (!timing) {
+		dev_err(emc->dev, "no timing for rate %lu min %lu max %lu\n",
+			rate, min_rate, max_rate);
+		return -EINVAL;
+	}
+
+	return timing->rate;
+}
+
 static int tegra_emc_probe(struct platform_device *pdev)
 {
 	struct device_node *np;
@@ -477,21 +516,28 @@ static int tegra_emc_probe(struct platform_device *pdev)
 		return err;
 	}
 
+	tegra20_clk_set_emc_round_callback(emc_round_rate, emc);
+
 	emc->clk = devm_clk_get(&pdev->dev, "emc");
 	if (IS_ERR(emc->clk)) {
 		err = PTR_ERR(emc->clk);
 		dev_err(&pdev->dev, "failed to get emc clock: %d\n", err);
-		return err;
+		goto unset_cb;
 	}
 
 	err = clk_notifier_register(emc->clk, &emc->clk_nb);
 	if (err) {
 		dev_err(&pdev->dev, "failed to register clk notifier: %d\n",
 			err);
-		return err;
+		goto unset_cb;
 	}
 
 	return 0;
+
+unset_cb:
+	tegra20_clk_set_emc_round_callback(NULL, NULL);
+
+	return err;
 }
 
 static const struct of_device_id tegra_emc_of_match[] = {
-- 
2.22.0


  parent reply index

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-11 21:00 [PATCH v10 00/15] memory: tegra: Introduce Tegra30 EMC driver Dmitry Osipenko
2019-08-11 21:00 ` [PATCH v10 01/15] clk: tegra20/30: Add custom EMC clock implementation Dmitry Osipenko
2019-08-12 23:12   ` Michał Mirosław
2019-08-13  2:36     ` Dmitry Osipenko
2019-08-21 16:46       ` Thierry Reding
2019-09-10 10:33   ` Stephen Boyd
2019-08-11 21:00 ` [PATCH v10 02/15] memory: tegra20-emc: Drop setting EMC rate to max on probe Dmitry Osipenko
2019-08-11 21:00 ` Dmitry Osipenko [this message]
2019-08-11 21:00 ` [PATCH v10 04/15] memory: tegra20-emc: Include io.h instead of iopoll.h Dmitry Osipenko
2019-08-11 21:00 ` [PATCH v10 05/15] memory: tegra20-emc: Pre-configure debug register Dmitry Osipenko
2019-08-11 21:00 ` [PATCH v10 06/15] memory: tegra20-emc: Print a brief info message about the timings Dmitry Osipenko
2019-08-11 21:00 ` [PATCH v10 07/15] memory: tegra20-emc: Increase handshake timeout Dmitry Osipenko
2019-08-11 21:00 ` [PATCH v10 08/15] memory: tegra20-emc: wait_for_completion_timeout() doesn't return error Dmitry Osipenko
2019-08-11 21:00 ` [PATCH v10 09/15] dt-bindings: memory: tegra30: Convert to Tegra124 YAML Dmitry Osipenko
2019-08-12 19:53   ` Rob Herring
2019-08-12 19:54     ` Rob Herring
2019-08-12 20:19       ` Dmitry Osipenko
2019-08-11 21:00 ` [PATCH v10 10/15] dt-bindings: memory: Add binding for NVIDIA Tegra30 Memory Controller Dmitry Osipenko
2019-08-12 19:55   ` Rob Herring
2019-08-11 21:00 ` [PATCH v10 11/15] dt-bindings: memory: Add binding for NVIDIA Tegra30 External " Dmitry Osipenko
2019-08-12 19:56   ` Rob Herring
2019-08-11 21:00 ` [PATCH v10 12/15] memory: tegra: Introduce Tegra30 EMC driver Dmitry Osipenko
2019-10-05 16:28   ` Peter Geis
2019-10-09  8:52     ` Dmitry Osipenko
2019-11-15 12:54   ` Jon Hunter
2019-11-15 13:17     ` Dmitry Osipenko
2019-08-11 21:00 ` [PATCH v10 13/15] memory: tegra: Ensure timing control debug features are disabled Dmitry Osipenko
2019-08-11 21:00 ` [PATCH v10 14/15] memory: tegra: Consolidate registers definition into common header Dmitry Osipenko
2019-08-11 21:00 ` [PATCH v10 15/15] ARM: dts: tegra30: Add External Memory Controller node Dmitry Osipenko
2019-10-29 13:51 ` [PATCH v10 00/15] memory: tegra: Introduce Tegra30 EMC driver Thierry Reding

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