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From: Dmitry Osipenko <digetx@gmail.com>
To: "Thierry Reding" <thierry.reding@gmail.com>,
	"Jonathan Hunter" <jonathanh@nvidia.com>,
	"Laxman Dewangan" <ldewangan@nvidia.com>,
	"Wolfram Sang" <wsa@the-dreams.de>,
	"Michał Mirosław" <mirq-linux@rere.qmqm.pl>,
	"Andy Shevchenko" <andy.shevchenko@gmail.com>
Cc: linux-i2c@vger.kernel.org, linux-tegra@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v3 21/22] i2c: tegra: Initialization div-clk rate unconditionally
Date: Thu,  3 Sep 2020 03:52:59 +0300	[thread overview]
Message-ID: <20200903005300.7894-22-digetx@gmail.com> (raw)
In-Reply-To: <20200903005300.7894-1-digetx@gmail.com>

It doesn't make sense to conditionalize the div-clk rate changes because
rate is fixed and it won't ever change once it's set at the driver's probe
time. All further changes are NO-OPs because CCF caches rate and skips
rate-change if rate is unchanged.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/i2c/busses/i2c-tegra.c | 32 +++++++++++++++-----------------
 1 file changed, 15 insertions(+), 17 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 79caf87bb4c0..bc7954c8a5a0 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -601,7 +601,7 @@ static int tegra_i2c_flush_fifos(struct tegra_i2c_dev *i2c_dev)
 	return -ETIMEDOUT;
 }
 
-static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit)
+static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
 {
 	u32 val, clk_divisor, clk_multiplier, tsu_thd, tlow, thigh;
 	int err;
@@ -656,16 +656,14 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev, bool clk_reinit)
 	if (i2c_dev->hw->has_interface_timing_reg && tsu_thd)
 		i2c_writel(i2c_dev, tsu_thd, I2C_INTERFACE_TIMING_1);
 
-	if (!clk_reinit) {
-		clk_multiplier = (tlow + thigh + 2);
-		clk_multiplier *= (i2c_dev->clk_divisor_non_hs_mode + 1);
-		err = clk_set_rate(i2c_dev->div_clk,
-				   i2c_dev->bus_clk_rate * clk_multiplier);
-		if (err) {
-			dev_err(i2c_dev->dev,
-				"failed to set div-clk rate: %d\n", err);
-			return err;
-		}
+	clk_multiplier  = tlow + thigh + 2;
+	clk_multiplier *= i2c_dev->clk_divisor_non_hs_mode + 1;
+
+	err = clk_set_rate(i2c_dev->div_clk,
+			   i2c_dev->bus_clk_rate * clk_multiplier);
+	if (err) {
+		dev_err(i2c_dev->dev, "failed to set div-clk rate: %d\n", err);
+		return err;
 	}
 
 	if (!i2c_dev->is_dvc && !i2c_dev->is_vi) {
@@ -1163,7 +1161,7 @@ static int tegra_i2c_error_recover(struct tegra_i2c_dev *i2c_dev,
 	if (i2c_dev->msg_err == I2C_ERR_NONE)
 		return 0;
 
-	tegra_i2c_init(i2c_dev, true);
+	tegra_i2c_init(i2c_dev);
 
 	/* start recovery upon arbitration loss in single master mode */
 	if (i2c_dev->msg_err == I2C_ERR_ARBITRATION_LOST) {
@@ -1303,7 +1301,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
 
 		if (!time_left && !completion_done(&i2c_dev->dma_complete)) {
 			dev_err(i2c_dev->dev, "DMA transfer timeout\n");
-			tegra_i2c_init(i2c_dev, true);
+			tegra_i2c_init(i2c_dev);
 			return -ETIMEDOUT;
 		}
 
@@ -1324,7 +1322,7 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev,
 
 	if (time_left == 0) {
 		dev_err(i2c_dev->dev, "I2C transfer timed out\n");
-		tegra_i2c_init(i2c_dev, true);
+		tegra_i2c_init(i2c_dev);
 		return -ETIMEDOUT;
 	}
 
@@ -1752,7 +1750,7 @@ static int tegra_i2c_init_runtime_pm_and_hardware(struct tegra_i2c_dev *i2c_dev)
 	}
 
 	/* initialize hardware state */
-	ret = tegra_i2c_init(i2c_dev, false);
+	ret = tegra_i2c_init(i2c_dev);
 
 	pm_runtime_put(i2c_dev->dev);
 
@@ -1907,7 +1905,7 @@ static int __maybe_unused tegra_i2c_runtime_resume(struct device *dev)
 	 * domain ON.
 	 */
 	if (i2c_dev->is_vi) {
-		ret = tegra_i2c_init(i2c_dev, true);
+		ret = tegra_i2c_init(i2c_dev);
 		if (ret)
 			goto disable_div_clk;
 	}
@@ -1961,7 +1959,7 @@ static int __maybe_unused tegra_i2c_resume(struct device *dev)
 	if (err)
 		return err;
 
-	err = tegra_i2c_init(i2c_dev, false);
+	err = tegra_i2c_init(i2c_dev);
 	if (err)
 		return err;
 
-- 
2.27.0


  parent reply	other threads:[~2020-09-03  0:54 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-03  0:52 [PATCH v3 00/22] Improvements for Tegra I2C driver Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 01/22] i2c: tegra: Make tegra_i2c_flush_fifos() usable in atomic transfer Dmitry Osipenko
2020-09-03 11:02   ` Andy Shevchenko
2020-09-03 13:49     ` Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 02/22] i2c: tegra: Add missing newline before returns Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 03/22] i2c: tegra: Clean up messages in the code Dmitry Osipenko
2020-09-03 11:06   ` Andy Shevchenko
2020-09-03 13:44     ` Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 04/22] i2c: tegra: Don't ignore tegra_i2c_flush_fifos() error Dmitry Osipenko
2020-09-03 11:09   ` Andy Shevchenko
2020-09-03 13:54     ` Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 05/22] i2c: tegra: Use reset_control_reset() Dmitry Osipenko
2020-09-03 11:11   ` Andy Shevchenko
2020-09-03 13:47     ` Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 06/22] i2c: tegra: Improve formatting of function variables Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 07/22] i2c: tegra: Use dev_err_probe() Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 08/22] i2c: tegra: Runtime PM always available on Tegra Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 09/22] i2c: tegra: Clean up probe function Dmitry Osipenko
2020-09-03 11:17   ` Andy Shevchenko
2020-09-03 13:48     ` Dmitry Osipenko
2020-09-03 14:02       ` Andy Shevchenko
2020-09-03 15:56         ` Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 10/22] i2c: tegra: Drop '_timeout' from wait/poll function names Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 11/22] i2c: tegra: Remove likely/unlikely from the code Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 12/22] i2c: tegra: Factor out error recovery from tegra_i2c_xfer_msg() Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 13/22] i2c: tegra: Check errors for both positive and negative values Dmitry Osipenko
2020-09-03 11:19   ` Andy Shevchenko
2020-09-03  0:52 ` [PATCH v3 14/22] i2c: tegra: Improve coding style of tegra_i2c_wait_for_config_load() Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 15/22] i2c: tegra: Clean up whitespaces and newlines Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 16/22] i2c: tegra: Rename variable in tegra_i2c_issue_bus_clear() Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 17/22] i2c: tegra: Improve driver module description Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 18/22] i2c: tegra: Reorder location of functions in the code Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 19/22] i2c: tegra: Factor out packet header setup from tegra_i2c_xfer_msg() Dmitry Osipenko
2020-09-03  0:52 ` [PATCH v3 20/22] i2c: tegra: Remove "dma" variable Dmitry Osipenko
2020-09-03  0:52 ` Dmitry Osipenko [this message]
2020-09-03  0:53 ` [PATCH v3 22/22] i2c: tegra: Remove i2c_dev.clk_divisor_non_hs_mode member Dmitry Osipenko

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