linux-kernel - [PATCH v6 06/35] i2c: tegra: Remove i2c_dev.clk_divisor_non_hs

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Message-Id: <20200908021021.9123-7-digetx@gmail.com>
Date:   Tue,  8 Sep 2020 05:09:52 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v6 06/35] i2c: tegra: Remove i2c_dev.clk_divisor_non_hs_mode member

The "non_hs_mode" divisor value is fixed, thus there is no need to have
the variable i2c_dev.clk_divisor_non_hs_mode struct member. Let's remove
it and move the mode selection into tegra_i2c_init() where it can be
united with the timing selection.

Reviewed-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/i2c/busses/i2c-tegra.c | 46 ++++++++++++++++------------------
 1 file changed, 21 insertions(+), 25 deletions(-)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 720a75439e91..85ed0e02d48c 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -250,7 +250,6 @@ struct tegra_i2c_hw_feature {
  * @msg_buf_remaining: size of unsent data in the message buffer
  * @msg_read: identifies read transfers
  * @bus_clk_rate: current I2C bus clock rate
- * @clk_divisor_non_hs_mode: clock divider for non-high-speed modes
  * @is_multimaster_mode: track if I2C controller is in multi-master mode
  * @tx_dma_chan: DMA transmit channel
  * @rx_dma_chan: DMA receive channel
@@ -281,7 +280,6 @@ struct tegra_i2c_dev {
 	size_t msg_buf_remaining;
 	int msg_read;
 	u32 bus_clk_rate;
-	u16 clk_divisor_non_hs_mode;
 	bool is_multimaster_mode;
 	struct dma_chan *tx_dma_chan;
 	struct dma_chan *rx_dma_chan;
@@ -783,6 +781,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
 	u32 val;
 	int err;
 	u32 clk_divisor, clk_multiplier;
+	u32 non_hs_mode;
 	u32 tsu_thd;
 	u8 tlow, thigh;
 
@@ -805,24 +804,33 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
 	if (i2c_dev->is_vi)
 		tegra_i2c_vi_init(i2c_dev);
 
-	/* Make sure clock divisor programmed correctly */
-	clk_divisor = FIELD_PREP(I2C_CLK_DIVISOR_HSMODE,
-				 i2c_dev->hw->clk_divisor_hs_mode) |
-		      FIELD_PREP(I2C_CLK_DIVISOR_STD_FAST_MODE,
-				 i2c_dev->clk_divisor_non_hs_mode);
-	i2c_writel(i2c_dev, clk_divisor, I2C_CLK_DIVISOR);
-
-	if (i2c_dev->bus_clk_rate > I2C_MAX_STANDARD_MODE_FREQ &&
-	    i2c_dev->bus_clk_rate <= I2C_MAX_FAST_MODE_PLUS_FREQ) {
+	switch (i2c_dev->bus_clk_rate) {
+	case I2C_MAX_STANDARD_MODE_FREQ + 1 ... I2C_MAX_FAST_MODE_PLUS_FREQ:
+	default:
 		tlow = i2c_dev->hw->tlow_fast_fastplus_mode;
 		thigh = i2c_dev->hw->thigh_fast_fastplus_mode;
 		tsu_thd = i2c_dev->hw->setup_hold_time_fast_fast_plus_mode;
-	} else {
+
+		if (i2c_dev->bus_clk_rate > I2C_MAX_FAST_MODE_FREQ)
+			non_hs_mode = i2c_dev->hw->clk_divisor_fast_plus_mode;
+		else
+			non_hs_mode = i2c_dev->hw->clk_divisor_fast_mode;
+		break;
+
+	case 0 ... I2C_MAX_STANDARD_MODE_FREQ:
 		tlow = i2c_dev->hw->tlow_std_mode;
 		thigh = i2c_dev->hw->thigh_std_mode;
 		tsu_thd = i2c_dev->hw->setup_hold_time_std_mode;
+		non_hs_mode = i2c_dev->hw->clk_divisor_std_mode;
+		break;
 	}
 
+	/* Make sure clock divisor programmed correctly */
+	clk_divisor = FIELD_PREP(I2C_CLK_DIVISOR_HSMODE,
+				 i2c_dev->hw->clk_divisor_hs_mode) |
+		      FIELD_PREP(I2C_CLK_DIVISOR_STD_FAST_MODE, non_hs_mode);
+	i2c_writel(i2c_dev, clk_divisor, I2C_CLK_DIVISOR);
+
 	if (i2c_dev->hw->has_interface_timing_reg) {
 		val = FIELD_PREP(I2C_INTERFACE_TIMING_THIGH, thigh) |
 		      FIELD_PREP(I2C_INTERFACE_TIMING_TLOW, tlow);
@@ -837,7 +845,7 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
 		i2c_writel(i2c_dev, tsu_thd, I2C_INTERFACE_TIMING_1);
 
 	clk_multiplier  = tlow + thigh + 2;
-	clk_multiplier *= i2c_dev->clk_divisor_non_hs_mode + 1;
+	clk_multiplier *= non_hs_mode + 1;
 
 	err = clk_set_rate(i2c_dev->div_clk,
 			   i2c_dev->bus_clk_rate * clk_multiplier);
@@ -1751,18 +1759,6 @@ static int tegra_i2c_probe(struct platform_device *pdev)
 		goto unprepare_fast_clk;
 	}
 
-	if (i2c_dev->bus_clk_rate > I2C_MAX_FAST_MODE_FREQ &&
-	    i2c_dev->bus_clk_rate <= I2C_MAX_FAST_MODE_PLUS_FREQ)
-		i2c_dev->clk_divisor_non_hs_mode =
-				i2c_dev->hw->clk_divisor_fast_plus_mode;
-	else if (i2c_dev->bus_clk_rate > I2C_MAX_STANDARD_MODE_FREQ &&
-		 i2c_dev->bus_clk_rate <= I2C_MAX_FAST_MODE_FREQ)
-		i2c_dev->clk_divisor_non_hs_mode =
-				i2c_dev->hw->clk_divisor_fast_mode;
-	else
-		i2c_dev->clk_divisor_non_hs_mode =
-				i2c_dev->hw->clk_divisor_std_mode;
-
 	ret = clk_prepare(i2c_dev->div_clk);
 	if (ret < 0) {
 		dev_err(i2c_dev->dev, "Clock prepare failed %d\n", ret);
-- 
2.27.0