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-rw-r--r--drivers/i2c/busses/i2c-cadence.c8
-rw-r--r--drivers/i2c/busses/i2c-designware-core.c45
-rw-r--r--drivers/i2c/busses/i2c-designware-core.h1
-rw-r--r--drivers/i2c/busses/i2c-imx-lpi2c.c20
-rw-r--r--drivers/i2c/busses/i2c-piix4.c26
5 files changed, 60 insertions, 40 deletions
diff --git a/drivers/i2c/busses/i2c-cadence.c b/drivers/i2c/busses/i2c-cadence.c
index 686971263bef..45d6771fac8c 100644
--- a/drivers/i2c/busses/i2c-cadence.c
+++ b/drivers/i2c/busses/i2c-cadence.c
@@ -962,10 +962,6 @@ static int cdns_i2c_probe(struct platform_device *pdev)
goto err_clk_dis;
}
- ret = i2c_add_adapter(&id->adap);
- if (ret < 0)
- goto err_clk_dis;
-
/*
* Cadence I2C controller has a bug wherein it generates
* invalid read transaction after HW timeout in master receiver mode.
@@ -975,6 +971,10 @@ static int cdns_i2c_probe(struct platform_device *pdev)
*/
cdns_i2c_writereg(CDNS_I2C_TIMEOUT_MAX, CDNS_I2C_TIME_OUT_OFFSET);
+ ret = i2c_add_adapter(&id->adap);
+ if (ret < 0)
+ goto err_clk_dis;
+
dev_info(&pdev->dev, "%u kHz mmio %08lx irq %d\n",
id->i2c_clk / 1000, (unsigned long)r_mem->start, id->irq);
diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c
index 6d81c56184d3..e9db857c6226 100644
--- a/drivers/i2c/busses/i2c-designware-core.c
+++ b/drivers/i2c/busses/i2c-designware-core.c
@@ -475,30 +475,28 @@ static int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev)
static void i2c_dw_xfer_init(struct dw_i2c_dev *dev)
{
struct i2c_msg *msgs = dev->msgs;
- u32 ic_tar = 0;
+ u32 ic_con, ic_tar = 0;
/* Disable the adapter */
__i2c_dw_enable_and_wait(dev, false);
/* if the slave address is ten bit address, enable 10BITADDR */
- if (dev->dynamic_tar_update_enabled) {
+ ic_con = dw_readl(dev, DW_IC_CON);
+ if (msgs[dev->msg_write_idx].flags & I2C_M_TEN) {
+ ic_con |= DW_IC_CON_10BITADDR_MASTER;
/*
* If I2C_DYNAMIC_TAR_UPDATE is set, the 10-bit addressing
- * mode has to be enabled via bit 12 of IC_TAR register,
- * otherwise bit 4 of IC_CON is used.
+ * mode has to be enabled via bit 12 of IC_TAR register.
+ * We set it always as I2C_DYNAMIC_TAR_UPDATE can't be
+ * detected from registers.
*/
- if (msgs[dev->msg_write_idx].flags & I2C_M_TEN)
- ic_tar = DW_IC_TAR_10BITADDR_MASTER;
+ ic_tar = DW_IC_TAR_10BITADDR_MASTER;
} else {
- u32 ic_con = dw_readl(dev, DW_IC_CON);
-
- if (msgs[dev->msg_write_idx].flags & I2C_M_TEN)
- ic_con |= DW_IC_CON_10BITADDR_MASTER;
- else
- ic_con &= ~DW_IC_CON_10BITADDR_MASTER;
- dw_writel(dev, ic_con, DW_IC_CON);
+ ic_con &= ~DW_IC_CON_10BITADDR_MASTER;
}
+ dw_writel(dev, ic_con, DW_IC_CON);
+
/*
* Set the slave (target) address and enable 10-bit addressing mode
* if applicable.
@@ -963,7 +961,6 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
{
struct i2c_adapter *adap = &dev->adapter;
int r;
- u32 reg;
init_completion(&dev->cmd_complete);
@@ -971,26 +968,6 @@ int i2c_dw_probe(struct dw_i2c_dev *dev)
if (r)
return r;
- r = i2c_dw_acquire_lock(dev);
- if (r)
- return r;
-
- /*
- * Test if dynamic TAR update is enabled in this controller by writing
- * to IC_10BITADDR_MASTER field in IC_CON: when it is enabled this
- * field is read-only so it should not succeed
- */
- reg = dw_readl(dev, DW_IC_CON);
- dw_writel(dev, reg ^ DW_IC_CON_10BITADDR_MASTER, DW_IC_CON);
-
- if ((dw_readl(dev, DW_IC_CON) & DW_IC_CON_10BITADDR_MASTER) ==
- (reg & DW_IC_CON_10BITADDR_MASTER)) {
- dev->dynamic_tar_update_enabled = true;
- dev_dbg(dev->dev, "Dynamic TAR update enabled");
- }
-
- i2c_dw_release_lock(dev);
-
snprintf(adap->name, sizeof(adap->name),
"Synopsys DesignWare I2C adapter");
adap->retries = 3;
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index 26250b425e2f..c1db3a5a340f 100644
--- a/drivers/i2c/busses/i2c-designware-core.h
+++ b/drivers/i2c/busses/i2c-designware-core.h
@@ -125,7 +125,6 @@ struct dw_i2c_dev {
int (*acquire_lock)(struct dw_i2c_dev *dev);
void (*release_lock)(struct dw_i2c_dev *dev);
bool pm_runtime_disabled;
- bool dynamic_tar_update_enabled;
};
#define ACCESS_SWAP 0x00000001
diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index c62b7cd475f8..3310f2e0dbd3 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -28,6 +28,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
+#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/slab.h>
@@ -636,12 +637,31 @@ static int lpi2c_imx_remove(struct platform_device *pdev)
return 0;
}
+#ifdef CONFIG_PM_SLEEP
+static int lpi2c_imx_suspend(struct device *dev)
+{
+ pinctrl_pm_select_sleep_state(dev);
+
+ return 0;
+}
+
+static int lpi2c_imx_resume(struct device *dev)
+{
+ pinctrl_pm_select_default_state(dev);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(imx_lpi2c_pm, lpi2c_imx_suspend, lpi2c_imx_resume);
+
static struct platform_driver lpi2c_imx_driver = {
.probe = lpi2c_imx_probe,
.remove = lpi2c_imx_remove,
.driver = {
.name = DRIVER_NAME,
.of_match_table = lpi2c_imx_of_match,
+ .pm = &imx_lpi2c_pm,
},
};
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index c2268cdf38e8..c21ca7bf2efe 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -58,7 +58,7 @@
#define SMBSLVDAT (0xC + piix4_smba)
/* count for request_region */
-#define SMBIOSIZE 8
+#define SMBIOSIZE 9
/* PCI Address Constants */
#define SMBBA 0x090
@@ -585,12 +585,33 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
u8 command, int size, union i2c_smbus_data *data)
{
struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
+ unsigned short piix4_smba = adapdata->smba;
+ int retries = MAX_TIMEOUT;
+ int smbslvcnt;
u8 smba_en_lo;
u8 port;
int retval;
mutex_lock(&piix4_mutex_sb800);
+ /* Request the SMBUS semaphore, avoid conflicts with the IMC */
+ smbslvcnt = inb_p(SMBSLVCNT);
+ do {
+ outb_p(smbslvcnt | 0x10, SMBSLVCNT);
+
+ /* Check the semaphore status */
+ smbslvcnt = inb_p(SMBSLVCNT);
+ if (smbslvcnt & 0x10)
+ break;
+
+ usleep_range(1000, 2000);
+ } while (--retries);
+ /* SMBus is still owned by the IMC, we give up */
+ if (!retries) {
+ mutex_unlock(&piix4_mutex_sb800);
+ return -EBUSY;
+ }
+
outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX);
smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
@@ -604,6 +625,9 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
outb_p(smba_en_lo, SB800_PIIX4_SMB_IDX + 1);
+ /* Release the semaphore */
+ outb_p(smbslvcnt | 0x20, SMBSLVCNT);
+
mutex_unlock(&piix4_mutex_sb800);
return retval;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-25 23:37:42 +0100