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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 few driver fixes for the I2C subsystem" * 'i2c/for-current-fixed' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: i2c: stm32f7: remove warning when compiling with W=1 i2c: stm32f7: fix a race in slave mode with arbitration loss irq i2c: stm32f7: fix first byte to send in slave mode i2c: mt65xx: fix NULL ptr dereference i2c: aspeed: fix master pending state handling
This commit is contained in:
commit
992cb107e1
3 changed files with 48 additions and 29 deletions
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@ -108,6 +108,12 @@
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#define ASPEED_I2CD_S_TX_CMD BIT(2)
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#define ASPEED_I2CD_M_TX_CMD BIT(1)
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#define ASPEED_I2CD_M_START_CMD BIT(0)
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#define ASPEED_I2CD_MASTER_CMDS_MASK \
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(ASPEED_I2CD_M_STOP_CMD | \
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ASPEED_I2CD_M_S_RX_CMD_LAST | \
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ASPEED_I2CD_M_RX_CMD | \
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ASPEED_I2CD_M_TX_CMD | \
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ASPEED_I2CD_M_START_CMD)
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/* 0x18 : I2CD Slave Device Address Register */
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#define ASPEED_I2CD_DEV_ADDR_MASK GENMASK(6, 0)
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@ -336,18 +342,19 @@ static void aspeed_i2c_do_start(struct aspeed_i2c_bus *bus)
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struct i2c_msg *msg = &bus->msgs[bus->msgs_index];
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u8 slave_addr = i2c_8bit_addr_from_msg(msg);
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bus->master_state = ASPEED_I2C_MASTER_START;
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#if IS_ENABLED(CONFIG_I2C_SLAVE)
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/*
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* If it's requested in the middle of a slave session, set the master
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* state to 'pending' then H/W will continue handling this master
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* command when the bus comes back to the idle state.
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*/
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if (bus->slave_state != ASPEED_I2C_SLAVE_INACTIVE)
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if (bus->slave_state != ASPEED_I2C_SLAVE_INACTIVE) {
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bus->master_state = ASPEED_I2C_MASTER_PENDING;
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return;
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}
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#endif /* CONFIG_I2C_SLAVE */
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bus->master_state = ASPEED_I2C_MASTER_START;
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bus->buf_index = 0;
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if (msg->flags & I2C_M_RD) {
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@ -422,20 +429,6 @@ static u32 aspeed_i2c_master_irq(struct aspeed_i2c_bus *bus, u32 irq_status)
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}
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}
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#if IS_ENABLED(CONFIG_I2C_SLAVE)
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/*
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* A pending master command will be started by H/W when the bus comes
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* back to idle state after completing a slave operation so change the
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* master state from 'pending' to 'start' at here if slave is inactive.
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*/
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if (bus->master_state == ASPEED_I2C_MASTER_PENDING) {
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if (bus->slave_state != ASPEED_I2C_SLAVE_INACTIVE)
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goto out_no_complete;
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bus->master_state = ASPEED_I2C_MASTER_START;
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}
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#endif /* CONFIG_I2C_SLAVE */
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/* Master is not currently active, irq was for someone else. */
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if (bus->master_state == ASPEED_I2C_MASTER_INACTIVE ||
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bus->master_state == ASPEED_I2C_MASTER_PENDING)
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@ -462,11 +455,15 @@ static u32 aspeed_i2c_master_irq(struct aspeed_i2c_bus *bus, u32 irq_status)
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#if IS_ENABLED(CONFIG_I2C_SLAVE)
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/*
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* If a peer master starts a xfer immediately after it queues a
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* master command, change its state to 'pending' then H/W will
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* continue the queued master xfer just after completing the
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* slave mode session.
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* master command, clear the queued master command and change
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* its state to 'pending'. To simplify handling of pending
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* cases, it uses S/W solution instead of H/W command queue
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* handling.
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*/
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if (unlikely(irq_status & ASPEED_I2CD_INTR_SLAVE_MATCH)) {
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writel(readl(bus->base + ASPEED_I2C_CMD_REG) &
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~ASPEED_I2CD_MASTER_CMDS_MASK,
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bus->base + ASPEED_I2C_CMD_REG);
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bus->master_state = ASPEED_I2C_MASTER_PENDING;
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dev_dbg(bus->dev,
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"master goes pending due to a slave start\n");
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@ -629,6 +626,14 @@ static irqreturn_t aspeed_i2c_bus_irq(int irq, void *dev_id)
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irq_handled |= aspeed_i2c_master_irq(bus,
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irq_remaining);
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}
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/*
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* Start a pending master command at here if a slave operation is
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* completed.
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*/
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if (bus->master_state == ASPEED_I2C_MASTER_PENDING &&
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bus->slave_state == ASPEED_I2C_SLAVE_INACTIVE)
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aspeed_i2c_do_start(bus);
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#else
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irq_handled = aspeed_i2c_master_irq(bus, irq_remaining);
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#endif /* CONFIG_I2C_SLAVE */
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@ -691,6 +696,15 @@ static int aspeed_i2c_master_xfer(struct i2c_adapter *adap,
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ASPEED_I2CD_BUS_BUSY_STS))
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aspeed_i2c_recover_bus(bus);
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/*
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* If timed out and the state is still pending, drop the pending
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* master command.
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*/
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spin_lock_irqsave(&bus->lock, flags);
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if (bus->master_state == ASPEED_I2C_MASTER_PENDING)
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bus->master_state = ASPEED_I2C_MASTER_INACTIVE;
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spin_unlock_irqrestore(&bus->lock, flags);
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return -ETIMEDOUT;
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}
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@ -875,7 +875,7 @@ static irqreturn_t mtk_i2c_irq(int irqno, void *dev_id)
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static u32 mtk_i2c_functionality(struct i2c_adapter *adap)
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{
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if (adap->quirks->flags & I2C_AQ_NO_ZERO_LEN)
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if (i2c_check_quirks(adap, I2C_AQ_NO_ZERO_LEN))
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return I2C_FUNC_I2C |
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(I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
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else
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@ -305,7 +305,7 @@ struct stm32f7_i2c_dev {
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struct regmap *regmap;
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};
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/**
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/*
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* All these values are coming from I2C Specification, Version 6.0, 4th of
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* April 2014.
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*
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@ -1192,6 +1192,8 @@ static void stm32f7_i2c_slave_start(struct stm32f7_i2c_dev *i2c_dev)
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STM32F7_I2C_CR1_TXIE;
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stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, mask);
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/* Write 1st data byte */
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writel_relaxed(value, base + STM32F7_I2C_TXDR);
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} else {
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/* Notify i2c slave that new write transfer is starting */
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i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
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@ -1501,7 +1503,7 @@ static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data)
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void __iomem *base = i2c_dev->base;
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struct device *dev = i2c_dev->dev;
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struct stm32_i2c_dma *dma = i2c_dev->dma;
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u32 mask, status;
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u32 status;
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status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
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@ -1526,12 +1528,15 @@ static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data)
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f7_msg->result = -EINVAL;
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}
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/* Disable interrupts */
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if (stm32f7_i2c_is_slave_registered(i2c_dev))
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mask = STM32F7_I2C_XFER_IRQ_MASK;
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else
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mask = STM32F7_I2C_ALL_IRQ_MASK;
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stm32f7_i2c_disable_irq(i2c_dev, mask);
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if (!i2c_dev->slave_running) {
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u32 mask;
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/* Disable interrupts */
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if (stm32f7_i2c_is_slave_registered(i2c_dev))
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mask = STM32F7_I2C_XFER_IRQ_MASK;
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else
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mask = STM32F7_I2C_ALL_IRQ_MASK;
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stm32f7_i2c_disable_irq(i2c_dev, mask);
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}
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/* Disable dma */
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if (i2c_dev->use_dma) {
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