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authorLinus Torvalds <torvalds@linux-foundation.org>2018-12-07 10:31:31 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-12-07 10:31:31 -0800
commit52f842ccd615564a75ef45f8a0985ff14a0a61ce (patch)
tree40b85fd264cb7d9941105f11fe87affecc0fe82a
parentc431b42058ecad834d87fea002604dc38feccfd2 (diff)
parentece27a337d42a3197935711997f2880f0957ed7e (diff)
Merge branch 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c fixes from Wolfram Sang: "A set of driver bugfixes for the I2C subsystem" * 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: i2c: uniphier-f: fix violation of tLOW requirement for Fast-mode i2c: uniphier: fix violation of tLOW requirement for Fast-mode i2c: uniphier-f: fill TX-FIFO only in IRQ handler for repeated START i2c: uniphier-f: fix timeout error after reading 8 bytes i2c: scmi: Fix probe error on devices with an empty SMB0001 ACPI device node i2c: axxia: properly handle master timeout i2c: rcar: check bus state before reinitializing i2c: nvidia-gpu: limit reads also for combined messages i2c: nvidia-gpu: adhere to I2C fault codes
-rw-r--r--drivers/i2c/busses/i2c-axxia.c40
-rw-r--r--drivers/i2c/busses/i2c-nvidia-gpu.c7
-rw-r--r--drivers/i2c/busses/i2c-rcar.c9
-rw-r--r--drivers/i2c/busses/i2c-scmi.c10
-rw-r--r--drivers/i2c/busses/i2c-uniphier-f.c49
-rw-r--r--drivers/i2c/busses/i2c-uniphier.c8
6 files changed, 93 insertions, 30 deletions
diff --git a/drivers/i2c/busses/i2c-axxia.c b/drivers/i2c/busses/i2c-axxia.c
index 8e60048a33f8..51d34959709b 100644
--- a/drivers/i2c/busses/i2c-axxia.c
+++ b/drivers/i2c/busses/i2c-axxia.c
@@ -74,8 +74,7 @@
MST_STATUS_ND)
#define MST_STATUS_ERR (MST_STATUS_NAK | \
MST_STATUS_AL | \
- MST_STATUS_IP | \
- MST_STATUS_TSS)
+ MST_STATUS_IP)
#define MST_TX_BYTES_XFRD 0x50
#define MST_RX_BYTES_XFRD 0x54
#define SCL_HIGH_PERIOD 0x80
@@ -241,7 +240,7 @@ static int axxia_i2c_empty_rx_fifo(struct axxia_i2c_dev *idev)
*/
if (c <= 0 || c > I2C_SMBUS_BLOCK_MAX) {
idev->msg_err = -EPROTO;
- i2c_int_disable(idev, ~0);
+ i2c_int_disable(idev, ~MST_STATUS_TSS);
complete(&idev->msg_complete);
break;
}
@@ -299,14 +298,19 @@ static irqreturn_t axxia_i2c_isr(int irq, void *_dev)
if (status & MST_STATUS_SCC) {
/* Stop completed */
- i2c_int_disable(idev, ~0);
+ i2c_int_disable(idev, ~MST_STATUS_TSS);
complete(&idev->msg_complete);
} else if (status & MST_STATUS_SNS) {
/* Transfer done */
- i2c_int_disable(idev, ~0);
+ i2c_int_disable(idev, ~MST_STATUS_TSS);
if (i2c_m_rd(idev->msg) && idev->msg_xfrd < idev->msg->len)
axxia_i2c_empty_rx_fifo(idev);
complete(&idev->msg_complete);
+ } else if (status & MST_STATUS_TSS) {
+ /* Transfer timeout */
+ idev->msg_err = -ETIMEDOUT;
+ i2c_int_disable(idev, ~MST_STATUS_TSS);
+ complete(&idev->msg_complete);
} else if (unlikely(status & MST_STATUS_ERR)) {
/* Transfer error */
i2c_int_disable(idev, ~0);
@@ -339,10 +343,10 @@ static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
u32 rx_xfer, tx_xfer;
u32 addr_1, addr_2;
unsigned long time_left;
+ unsigned int wt_value;
idev->msg = msg;
idev->msg_xfrd = 0;
- idev->msg_err = 0;
reinit_completion(&idev->msg_complete);
if (i2c_m_ten(msg)) {
@@ -383,9 +387,18 @@ static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
else if (axxia_i2c_fill_tx_fifo(idev) != 0)
int_mask |= MST_STATUS_TFL;
+ wt_value = WT_VALUE(readl(idev->base + WAIT_TIMER_CONTROL));
+ /* Disable wait timer temporarly */
+ writel(wt_value, idev->base + WAIT_TIMER_CONTROL);
+ /* Check if timeout error happened */
+ if (idev->msg_err)
+ goto out;
+
/* Start manual mode */
writel(CMD_MANUAL, idev->base + MST_COMMAND);
+ writel(WT_EN | wt_value, idev->base + WAIT_TIMER_CONTROL);
+
i2c_int_enable(idev, int_mask);
time_left = wait_for_completion_timeout(&idev->msg_complete,
@@ -396,13 +409,15 @@ static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
if (readl(idev->base + MST_COMMAND) & CMD_BUSY)
dev_warn(idev->dev, "busy after xfer\n");
- if (time_left == 0)
+ if (time_left == 0) {
idev->msg_err = -ETIMEDOUT;
-
- if (idev->msg_err == -ETIMEDOUT)
i2c_recover_bus(&idev->adapter);
+ axxia_i2c_init(idev);
+ }
- if (unlikely(idev->msg_err) && idev->msg_err != -ENXIO)
+out:
+ if (unlikely(idev->msg_err) && idev->msg_err != -ENXIO &&
+ idev->msg_err != -ETIMEDOUT)
axxia_i2c_init(idev);
return idev->msg_err;
@@ -410,7 +425,7 @@ static int axxia_i2c_xfer_msg(struct axxia_i2c_dev *idev, struct i2c_msg *msg)
static int axxia_i2c_stop(struct axxia_i2c_dev *idev)
{
- u32 int_mask = MST_STATUS_ERR | MST_STATUS_SCC;
+ u32 int_mask = MST_STATUS_ERR | MST_STATUS_SCC | MST_STATUS_TSS;
unsigned long time_left;
reinit_completion(&idev->msg_complete);
@@ -437,6 +452,9 @@ axxia_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
int i;
int ret = 0;
+ idev->msg_err = 0;
+ i2c_int_enable(idev, MST_STATUS_TSS);
+
for (i = 0; ret == 0 && i < num; ++i)
ret = axxia_i2c_xfer_msg(idev, &msgs[i]);
diff --git a/drivers/i2c/busses/i2c-nvidia-gpu.c b/drivers/i2c/busses/i2c-nvidia-gpu.c
index 8822357bca0c..e99c3bb58351 100644
--- a/drivers/i2c/busses/i2c-nvidia-gpu.c
+++ b/drivers/i2c/busses/i2c-nvidia-gpu.c
@@ -89,7 +89,7 @@ static int gpu_i2c_check_status(struct gpu_i2c_dev *i2cd)
if (time_is_before_jiffies(target)) {
dev_err(i2cd->dev, "i2c timeout error %x\n", val);
- return -ETIME;
+ return -ETIMEDOUT;
}
val = readl(i2cd->regs + I2C_MST_CNTL);
@@ -97,9 +97,9 @@ static int gpu_i2c_check_status(struct gpu_i2c_dev *i2cd)
case I2C_MST_CNTL_STATUS_OKAY:
return 0;
case I2C_MST_CNTL_STATUS_NO_ACK:
- return -EIO;
+ return -ENXIO;
case I2C_MST_CNTL_STATUS_TIMEOUT:
- return -ETIME;
+ return -ETIMEDOUT;
default:
return 0;
}
@@ -218,6 +218,7 @@ stop:
static const struct i2c_adapter_quirks gpu_i2c_quirks = {
.max_read_len = 4,
+ .max_comb_2nd_msg_len = 4,
.flags = I2C_AQ_COMB_WRITE_THEN_READ,
};
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 4aa7dde876f3..254e6219e538 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -779,6 +779,11 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
pm_runtime_get_sync(dev);
+ /* Check bus state before init otherwise bus busy info will be lost */
+ ret = rcar_i2c_bus_barrier(priv);
+ if (ret < 0)
+ goto out;
+
/* Gen3 needs a reset before allowing RXDMA once */
if (priv->devtype == I2C_RCAR_GEN3) {
priv->flags |= ID_P_NO_RXDMA;
@@ -791,10 +796,6 @@ static int rcar_i2c_master_xfer(struct i2c_adapter *adap,
rcar_i2c_init(priv);
- ret = rcar_i2c_bus_barrier(priv);
- if (ret < 0)
- goto out;
-
for (i = 0; i < num; i++)
rcar_i2c_request_dma(priv, msgs + i);
diff --git a/drivers/i2c/busses/i2c-scmi.c b/drivers/i2c/busses/i2c-scmi.c
index 7e9a2bbf5ddc..ff3f4553648f 100644
--- a/drivers/i2c/busses/i2c-scmi.c
+++ b/drivers/i2c/busses/i2c-scmi.c
@@ -367,6 +367,7 @@ static int acpi_smbus_cmi_add(struct acpi_device *device)
{
struct acpi_smbus_cmi *smbus_cmi;
const struct acpi_device_id *id;
+ int ret;
smbus_cmi = kzalloc(sizeof(struct acpi_smbus_cmi), GFP_KERNEL);
if (!smbus_cmi)
@@ -388,8 +389,10 @@ static int acpi_smbus_cmi_add(struct acpi_device *device)
acpi_walk_namespace(ACPI_TYPE_METHOD, smbus_cmi->handle, 1,
acpi_smbus_cmi_query_methods, NULL, smbus_cmi, NULL);
- if (smbus_cmi->cap_info == 0)
+ if (smbus_cmi->cap_info == 0) {
+ ret = -ENODEV;
goto err;
+ }
snprintf(smbus_cmi->adapter.name, sizeof(smbus_cmi->adapter.name),
"SMBus CMI adapter %s",
@@ -400,7 +403,8 @@ static int acpi_smbus_cmi_add(struct acpi_device *device)
smbus_cmi->adapter.class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
smbus_cmi->adapter.dev.parent = &device->dev;
- if (i2c_add_adapter(&smbus_cmi->adapter)) {
+ ret = i2c_add_adapter(&smbus_cmi->adapter);
+ if (ret) {
dev_err(&device->dev, "Couldn't register adapter!\n");
goto err;
}
@@ -410,7 +414,7 @@ static int acpi_smbus_cmi_add(struct acpi_device *device)
err:
kfree(smbus_cmi);
device->driver_data = NULL;
- return -EIO;
+ return ret;
}
static int acpi_smbus_cmi_remove(struct acpi_device *device)
diff --git a/drivers/i2c/busses/i2c-uniphier-f.c b/drivers/i2c/busses/i2c-uniphier-f.c
index dd384743dbbd..03da4a539a2f 100644
--- a/drivers/i2c/busses/i2c-uniphier-f.c
+++ b/drivers/i2c/busses/i2c-uniphier-f.c
@@ -173,8 +173,6 @@ static irqreturn_t uniphier_fi2c_interrupt(int irq, void *dev_id)
"interrupt: enabled_irqs=%04x, irq_status=%04x\n",
priv->enabled_irqs, irq_status);
- uniphier_fi2c_clear_irqs(priv, irq_status);
-
if (irq_status & UNIPHIER_FI2C_INT_STOP)
goto complete;
@@ -214,7 +212,13 @@ static irqreturn_t uniphier_fi2c_interrupt(int irq, void *dev_id)
if (irq_status & (UNIPHIER_FI2C_INT_RF | UNIPHIER_FI2C_INT_RB)) {
uniphier_fi2c_drain_rxfifo(priv);
- if (!priv->len)
+ /*
+ * If the number of bytes to read is multiple of the FIFO size
+ * (msg->len == 8, 16, 24, ...), the INT_RF bit is set a little
+ * earlier than INT_RB. We wait for INT_RB to confirm the
+ * completion of the current message.
+ */
+ if (!priv->len && (irq_status & UNIPHIER_FI2C_INT_RB))
goto data_done;
if (unlikely(priv->flags & UNIPHIER_FI2C_MANUAL_NACK)) {
@@ -253,12 +257,20 @@ complete:
}
handled:
+ /*
+ * This controller makes a pause while any bit of the IRQ status is
+ * asserted. Clear the asserted bit to kick the controller just before
+ * exiting the handler.
+ */
+ uniphier_fi2c_clear_irqs(priv, irq_status);
+
spin_unlock(&priv->lock);
return IRQ_HANDLED;
}
-static void uniphier_fi2c_tx_init(struct uniphier_fi2c_priv *priv, u16 addr)
+static void uniphier_fi2c_tx_init(struct uniphier_fi2c_priv *priv, u16 addr,
+ bool repeat)
{
priv->enabled_irqs |= UNIPHIER_FI2C_INT_TE;
uniphier_fi2c_set_irqs(priv);
@@ -268,8 +280,12 @@ static void uniphier_fi2c_tx_init(struct uniphier_fi2c_priv *priv, u16 addr)
/* set slave address */
writel(UNIPHIER_FI2C_DTTX_CMD | addr << 1,
priv->membase + UNIPHIER_FI2C_DTTX);
- /* first chunk of data */
- uniphier_fi2c_fill_txfifo(priv, true);
+ /*
+ * First chunk of data. For a repeated START condition, do not write
+ * data to the TX fifo here to avoid the timing issue.
+ */
+ if (!repeat)
+ uniphier_fi2c_fill_txfifo(priv, true);
}
static void uniphier_fi2c_rx_init(struct uniphier_fi2c_priv *priv, u16 addr)
@@ -350,7 +366,7 @@ static int uniphier_fi2c_master_xfer_one(struct i2c_adapter *adap,
if (is_read)
uniphier_fi2c_rx_init(priv, msg->addr);
else
- uniphier_fi2c_tx_init(priv, msg->addr);
+ uniphier_fi2c_tx_init(priv, msg->addr, repeat);
dev_dbg(&adap->dev, "start condition\n");
/*
@@ -502,9 +518,26 @@ static void uniphier_fi2c_hw_init(struct uniphier_fi2c_priv *priv)
uniphier_fi2c_reset(priv);
+ /*
+ * Standard-mode: tLOW + tHIGH = 10 us
+ * Fast-mode: tLOW + tHIGH = 2.5 us
+ */
writel(cyc, priv->membase + UNIPHIER_FI2C_CYC);
- writel(cyc / 2, priv->membase + UNIPHIER_FI2C_LCTL);
+ /*
+ * Standard-mode: tLOW = 4.7 us, tHIGH = 4.0 us, tBUF = 4.7 us
+ * Fast-mode: tLOW = 1.3 us, tHIGH = 0.6 us, tBUF = 1.3 us
+ * "tLow/tHIGH = 5/4" meets both.
+ */
+ writel(cyc * 5 / 9, priv->membase + UNIPHIER_FI2C_LCTL);
+ /*
+ * Standard-mode: tHD;STA = 4.0 us, tSU;STA = 4.7 us, tSU;STO = 4.0 us
+ * Fast-mode: tHD;STA = 0.6 us, tSU;STA = 0.6 us, tSU;STO = 0.6 us
+ */
writel(cyc / 2, priv->membase + UNIPHIER_FI2C_SSUT);
+ /*
+ * Standard-mode: tSU;DAT = 250 ns
+ * Fast-mode: tSU;DAT = 100 ns
+ */
writel(cyc / 16, priv->membase + UNIPHIER_FI2C_DSUT);
uniphier_fi2c_prepare_operation(priv);
diff --git a/drivers/i2c/busses/i2c-uniphier.c b/drivers/i2c/busses/i2c-uniphier.c
index 454f914ae66d..c488e558aef7 100644
--- a/drivers/i2c/busses/i2c-uniphier.c
+++ b/drivers/i2c/busses/i2c-uniphier.c
@@ -320,7 +320,13 @@ static void uniphier_i2c_hw_init(struct uniphier_i2c_priv *priv)
uniphier_i2c_reset(priv, true);
- writel((cyc / 2 << 16) | cyc, priv->membase + UNIPHIER_I2C_CLK);
+ /*
+ * Bit30-16: clock cycles of tLOW.
+ * Standard-mode: tLOW = 4.7 us, tHIGH = 4.0 us
+ * Fast-mode: tLOW = 1.3 us, tHIGH = 0.6 us
+ * "tLow/tHIGH = 5/4" meets both.
+ */
+ writel((cyc * 5 / 9 << 16) | cyc, priv->membase + UNIPHIER_I2C_CLK);
uniphier_i2c_reset(priv, false);
}