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authorLinus Torvalds <torvalds@linux-foundation.org>2020-10-10 16:09:12 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-10 16:09:12 -0700
commitda690031a5d6d50a361e3f19f3eeabd086a6f20d (patch)
tree9bb1500867b6da627db3860701db974da8c4543d
parent64b7f674c292207624b3d788eda2dde3dc1415df (diff)
parentf5b3f433641c543ebe5171285a42aa6adcdb2d22 (diff)
downloadlinux-sh-da690031a5d6d50a361e3f19f3eeabd086a6f20d.tar.gz
Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c fixes from Wolfram Sang: "Some more driver bugfixes for I2C. Including a revert - the updated series for it will come during the next merge window" * 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: i2c: owl: Clear NACK and BUS error bits Revert "i2c: imx: Fix reset of I2SR_IAL flag" i2c: meson: fixup rate calculation with filter delay i2c: meson: keep peripheral clock enabled i2c: meson: fix clock setting overwrite i2c: imx: Fix reset of I2SR_IAL flag
-rw-r--r--drivers/i2c/busses/i2c-meson.c52
-rw-r--r--drivers/i2c/busses/i2c-owl.c6
2 files changed, 39 insertions, 19 deletions
diff --git a/drivers/i2c/busses/i2c-meson.c b/drivers/i2c/busses/i2c-meson.c
index c5dec572fc48..ef73a42577cc 100644
--- a/drivers/i2c/busses/i2c-meson.c
+++ b/drivers/i2c/busses/i2c-meson.c
@@ -5,6 +5,7 @@
* Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
*/
+#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/i2c.h>
@@ -33,12 +34,17 @@
#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)
+#define REG_SLV_SCL_FILTER GENMASK(13, 11)
+#define REG_SLV_SCL_LOW GENMASK(27, 16)
+#define REG_SLV_SCL_LOW_EN BIT(28)
#define I2C_TIMEOUT_MS 500
+#define FILTER_DELAY 15
enum {
TOKEN_END = 0,
@@ -133,19 +139,24 @@ 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,
+ FIELD_PREP(REG_CTRL_CLKDIVEXT, div >> 10));
- meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIVEXT_MASK,
- (div >> 10) << REG_CTRL_CLKDIVEXT_SHIFT);
+ /* Disable HIGH/LOW mode */
+ meson_i2c_set_mask(i2c, REG_SLAVE_ADDR, REG_SLV_SCL_LOW_EN, 0);
dev_dbg(i2c->dev, "%s: clk %lu, freq %u, div %u\n", __func__,
clk_rate, freq, div);
@@ -280,7 +291,10 @@ static void meson_i2c_do_start(struct meson_i2c *i2c, struct i2c_msg *msg)
token = (msg->flags & I2C_M_RD) ? TOKEN_SLAVE_ADDR_READ :
TOKEN_SLAVE_ADDR_WRITE;
- writel(msg->addr << 1, i2c->regs + REG_SLAVE_ADDR);
+
+ meson_i2c_set_mask(i2c, REG_SLAVE_ADDR, REG_SLV_ADDR,
+ FIELD_PREP(REG_SLV_ADDR, msg->addr << 1));
+
meson_i2c_add_token(i2c, TOKEN_START);
meson_i2c_add_token(i2c, token);
}
@@ -357,16 +371,12 @@ static int meson_i2c_xfer_messages(struct i2c_adapter *adap,
struct meson_i2c *i2c = adap->algo_data;
int i, ret = 0;
- clk_enable(i2c->clk);
-
for (i = 0; i < num; i++) {
ret = meson_i2c_xfer_msg(i2c, msgs + i, i == num - 1, atomic);
if (ret)
break;
}
- clk_disable(i2c->clk);
-
return ret ?: i;
}
@@ -435,7 +445,7 @@ static int meson_i2c_probe(struct platform_device *pdev)
return ret;
}
- ret = clk_prepare(i2c->clk);
+ ret = clk_prepare_enable(i2c->clk);
if (ret < 0) {
dev_err(&pdev->dev, "can't prepare clock\n");
return ret;
@@ -457,10 +467,14 @@ static int meson_i2c_probe(struct platform_device *pdev)
ret = i2c_add_adapter(&i2c->adap);
if (ret < 0) {
- clk_unprepare(i2c->clk);
+ clk_disable_unprepare(i2c->clk);
return ret;
}
+ /* Disable filtering */
+ meson_i2c_set_mask(i2c, REG_SLAVE_ADDR,
+ REG_SLV_SDA_FILTER | REG_SLV_SCL_FILTER, 0);
+
meson_i2c_set_clk_div(i2c, timings.bus_freq_hz);
return 0;
@@ -471,7 +485,7 @@ static int meson_i2c_remove(struct platform_device *pdev)
struct meson_i2c *i2c = platform_get_drvdata(pdev);
i2c_del_adapter(&i2c->adap);
- clk_unprepare(i2c->clk);
+ clk_disable_unprepare(i2c->clk);
return 0;
}
diff --git a/drivers/i2c/busses/i2c-owl.c b/drivers/i2c/busses/i2c-owl.c
index 672f1f239bd6..a163b8f308c1 100644
--- a/drivers/i2c/busses/i2c-owl.c
+++ b/drivers/i2c/busses/i2c-owl.c
@@ -176,6 +176,9 @@ static irqreturn_t owl_i2c_interrupt(int irq, void *_dev)
fifostat = readl(i2c_dev->base + OWL_I2C_REG_FIFOSTAT);
if (fifostat & OWL_I2C_FIFOSTAT_RNB) {
i2c_dev->err = -ENXIO;
+ /* Clear NACK error bit by writing "1" */
+ owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_FIFOSTAT,
+ OWL_I2C_FIFOSTAT_RNB, true);
goto stop;
}
@@ -183,6 +186,9 @@ static irqreturn_t owl_i2c_interrupt(int irq, void *_dev)
stat = readl(i2c_dev->base + OWL_I2C_REG_STAT);
if (stat & OWL_I2C_STAT_BEB) {
i2c_dev->err = -EIO;
+ /* Clear BUS error bit by writing "1" */
+ owl_i2c_update_reg(i2c_dev->base + OWL_I2C_REG_STAT,
+ OWL_I2C_STAT_BEB, true);
goto stop;
}