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From: Jerome Brunet <jbrunet@baylibre.com>
To: Wolfram Sang <wsa@kernel.org>, Kevin Hilman <khilman@baylibre.com>
Cc: Nicolas Belin <nbelin@baylibre.com>,
	linux-i2c@vger.kernel.org, linux-amlogic@lists.infradead.org,
	linux-kernel@vger.kernel.org,
	Jerome Brunet <jbrunet@baylibre.com>
Subject: [PATCH 3/3] i2c: meson: fixup rate calculation with filter delay
Date: Wed,  7 Oct 2020 10:07:51 +0200	[thread overview]
Message-ID: <20201007080751.1259442-4-jbrunet@baylibre.com> (raw)
In-Reply-To: <20201007080751.1259442-1-jbrunet@baylibre.com>

From: Nicolas Belin <nbelin@baylibre.com>

Apparently, 15 cycles of the peripheral clock are used by the controller
for sampling and filtering. Because this was not known before, the rate
calculation is slightly off.

Clean up and fix the calculation taking this filtering delay into account.

Fixes: 30021e3707a7 ("i2c: add support for Amlogic Meson I2C controller")
Signed-off-by: Nicolas Belin <nbelin@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
---
 drivers/i2c/busses/i2c-meson.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/i2c/busses/i2c-meson.c b/drivers/i2c/busses/i2c-meson.c
index e7ec2ab2a220..ef73a42577cc 100644
--- a/drivers/i2c/busses/i2c-meson.c
+++ b/drivers/i2c/busses/i2c-meson.c
@@ -34,10 +34,8 @@
 #define REG_CTRL_ACK_IGNORE	BIT(1)
 #define REG_CTRL_STATUS		BIT(2)
 #define REG_CTRL_ERROR		BIT(3)
-#define REG_CTRL_CLKDIV_SHIFT	12
-#define REG_CTRL_CLKDIV_MASK	GENMASK(21, 12)
-#define REG_CTRL_CLKDIVEXT_SHIFT 28
-#define REG_CTRL_CLKDIVEXT_MASK	GENMASK(29, 28)
+#define REG_CTRL_CLKDIV		GENMASK(21, 12)
+#define REG_CTRL_CLKDIVEXT	GENMASK(29, 28)
 
 #define REG_SLV_ADDR		GENMASK(7, 0)
 #define REG_SLV_SDA_FILTER	GENMASK(10, 8)
@@ -46,6 +44,7 @@
 #define REG_SLV_SCL_LOW_EN	BIT(28)
 
 #define I2C_TIMEOUT_MS		500
+#define FILTER_DELAY		15
 
 enum {
 	TOKEN_END = 0,
@@ -140,19 +139,21 @@ static void meson_i2c_set_clk_div(struct meson_i2c *i2c, unsigned int freq)
 	unsigned long clk_rate = clk_get_rate(i2c->clk);
 	unsigned int div;
 
-	div = DIV_ROUND_UP(clk_rate, freq * i2c->data->div_factor);
+	div = DIV_ROUND_UP(clk_rate, freq);
+	div -= FILTER_DELAY;
+	div = DIV_ROUND_UP(div, i2c->data->div_factor);
 
 	/* clock divider has 12 bits */
-	if (div >= (1 << 12)) {
+	if (div > GENMASK(11, 0)) {
 		dev_err(i2c->dev, "requested bus frequency too low\n");
-		div = (1 << 12) - 1;
+		div = GENMASK(11, 0);
 	}
 
-	meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIV_MASK,
-			   (div & GENMASK(9, 0)) << REG_CTRL_CLKDIV_SHIFT);
+	meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIV,
+			   FIELD_PREP(REG_CTRL_CLKDIV, div & GENMASK(9, 0)));
 
-	meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIVEXT_MASK,
-			   (div >> 10) << REG_CTRL_CLKDIVEXT_SHIFT);
+	meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIVEXT,
+			   FIELD_PREP(REG_CTRL_CLKDIVEXT, div >> 10));
 
 	/* Disable HIGH/LOW mode */
 	meson_i2c_set_mask(i2c, REG_SLAVE_ADDR, REG_SLV_SCL_LOW_EN, 0);
-- 
2.25.4


WARNING: multiple messages have this Message-ID (diff)
From: Jerome Brunet <jbrunet@baylibre.com>
To: Wolfram Sang <wsa@kernel.org>, Kevin Hilman <khilman@baylibre.com>
Cc: linux-amlogic@lists.infradead.org,
	Jerome Brunet <jbrunet@baylibre.com>,
	linux-i2c@vger.kernel.org, Nicolas Belin <nbelin@baylibre.com>,
	linux-kernel@vger.kernel.org
Subject: [PATCH 3/3] i2c: meson: fixup rate calculation with filter delay
Date: Wed,  7 Oct 2020 10:07:51 +0200	[thread overview]
Message-ID: <20201007080751.1259442-4-jbrunet@baylibre.com> (raw)
In-Reply-To: <20201007080751.1259442-1-jbrunet@baylibre.com>

From: Nicolas Belin <nbelin@baylibre.com>

Apparently, 15 cycles of the peripheral clock are used by the controller
for sampling and filtering. Because this was not known before, the rate
calculation is slightly off.

Clean up and fix the calculation taking this filtering delay into account.

Fixes: 30021e3707a7 ("i2c: add support for Amlogic Meson I2C controller")
Signed-off-by: Nicolas Belin <nbelin@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
---
 drivers/i2c/busses/i2c-meson.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/i2c/busses/i2c-meson.c b/drivers/i2c/busses/i2c-meson.c
index e7ec2ab2a220..ef73a42577cc 100644
--- a/drivers/i2c/busses/i2c-meson.c
+++ b/drivers/i2c/busses/i2c-meson.c
@@ -34,10 +34,8 @@
 #define REG_CTRL_ACK_IGNORE	BIT(1)
 #define REG_CTRL_STATUS		BIT(2)
 #define REG_CTRL_ERROR		BIT(3)
-#define REG_CTRL_CLKDIV_SHIFT	12
-#define REG_CTRL_CLKDIV_MASK	GENMASK(21, 12)
-#define REG_CTRL_CLKDIVEXT_SHIFT 28
-#define REG_CTRL_CLKDIVEXT_MASK	GENMASK(29, 28)
+#define REG_CTRL_CLKDIV		GENMASK(21, 12)
+#define REG_CTRL_CLKDIVEXT	GENMASK(29, 28)
 
 #define REG_SLV_ADDR		GENMASK(7, 0)
 #define REG_SLV_SDA_FILTER	GENMASK(10, 8)
@@ -46,6 +44,7 @@
 #define REG_SLV_SCL_LOW_EN	BIT(28)
 
 #define I2C_TIMEOUT_MS		500
+#define FILTER_DELAY		15
 
 enum {
 	TOKEN_END = 0,
@@ -140,19 +139,21 @@ static void meson_i2c_set_clk_div(struct meson_i2c *i2c, unsigned int freq)
 	unsigned long clk_rate = clk_get_rate(i2c->clk);
 	unsigned int div;
 
-	div = DIV_ROUND_UP(clk_rate, freq * i2c->data->div_factor);
+	div = DIV_ROUND_UP(clk_rate, freq);
+	div -= FILTER_DELAY;
+	div = DIV_ROUND_UP(div, i2c->data->div_factor);
 
 	/* clock divider has 12 bits */
-	if (div >= (1 << 12)) {
+	if (div > GENMASK(11, 0)) {
 		dev_err(i2c->dev, "requested bus frequency too low\n");
-		div = (1 << 12) - 1;
+		div = GENMASK(11, 0);
 	}
 
-	meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIV_MASK,
-			   (div & GENMASK(9, 0)) << REG_CTRL_CLKDIV_SHIFT);
+	meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIV,
+			   FIELD_PREP(REG_CTRL_CLKDIV, div & GENMASK(9, 0)));
 
-	meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIVEXT_MASK,
-			   (div >> 10) << REG_CTRL_CLKDIVEXT_SHIFT);
+	meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIVEXT,
+			   FIELD_PREP(REG_CTRL_CLKDIVEXT, div >> 10));
 
 	/* Disable HIGH/LOW mode */
 	meson_i2c_set_mask(i2c, REG_SLAVE_ADDR, REG_SLV_SCL_LOW_EN, 0);
-- 
2.25.4


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http://lists.infradead.org/mailman/listinfo/linux-amlogic

  parent reply	other threads:[~2020-10-07  8:08 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-07  8:07 [PATCH 0/3] i2c: meson: scl rate fixups Jerome Brunet
2020-10-07  8:07 ` Jerome Brunet
2020-10-07  8:07 ` [PATCH 1/3] i2c: meson: fix clock setting overwrite Jerome Brunet
2020-10-07  8:07   ` Jerome Brunet
2020-10-08  9:59   ` Wolfram Sang
2020-10-08  9:59     ` Wolfram Sang
2020-10-07  8:07 ` [PATCH 2/3] i2c: meson: keep peripheral clock enabled Jerome Brunet
2020-10-07  8:07   ` Jerome Brunet
2020-10-08 10:00   ` Wolfram Sang
2020-10-08 10:00     ` Wolfram Sang
2020-10-07  8:07 ` Jerome Brunet [this message]
2020-10-07  8:07   ` [PATCH 3/3] i2c: meson: fixup rate calculation with filter delay Jerome Brunet
2020-10-08 10:00   ` Wolfram Sang
2020-10-08 10:00     ` Wolfram Sang

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