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commit 52f842ccd615564a75ef45f8a0985ff14a0a61ce
parent c431b42058ecad834d87fea002604dc38feccfd2
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Fri,  7 Dec 2018 10:31:31 -0800

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

Diffstat:
Mdrivers/i2c/busses/i2c-axxia.c | 40+++++++++++++++++++++++++++++-----------
Mdrivers/i2c/busses/i2c-nvidia-gpu.c | 7++++---
Mdrivers/i2c/busses/i2c-rcar.c | 9+++++----
Mdrivers/i2c/busses/i2c-scmi.c | 10+++++++---
Mdrivers/i2c/busses/i2c-uniphier-f.c | 49+++++++++++++++++++++++++++++++++++++++++--------
Mdrivers/i2c/busses/i2c-uniphier.c | 8+++++++-
6 files changed, 93 insertions(+), 30 deletions(-)

diff --git 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 @@ -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 @@ -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 @@ -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 @@ -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 @@ -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); }