History

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

Linus Torvalds committed 7 years ago

Commit 992cb102 parents acf913b 348e46f3 files · +48 −29Browse files

Showing the changes to drivers (3 of 3 files). Show all

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3 files
  1. drivers/i2c/busses/i2c-aspeed.c +34 −20
  2. drivers/i2c/busses/i2c-mt65xx.c +1 −1
  3. drivers/i2c/busses/i2c-stm32f7.c +13 −8
drivers/i2c/busses/i2c-aspeed.c+34−20
@@ -108,6 +108,12 @@ · 107 unmodified lines
108#define ASPEED_I2CD_S_TX_CMD BIT(2)108#define ASPEED_I2CD_S_TX_CMD BIT(2)
109#define ASPEED_I2CD_M_TX_CMD BIT(1)109#define ASPEED_I2CD_M_TX_CMD BIT(1)
110#define ASPEED_I2CD_M_START_CMD BIT(0)110#define ASPEED_I2CD_M_START_CMD BIT(0)
111#define ASPEED_I2CD_MASTER_CMDS_MASK \
112 (ASPEED_I2CD_M_STOP_CMD | \
113 ASPEED_I2CD_M_S_RX_CMD_LAST | \
114 ASPEED_I2CD_M_RX_CMD | \
115 ASPEED_I2CD_M_TX_CMD | \
116 ASPEED_I2CD_M_START_CMD)
111 117
112/* 0x18 : I2CD Slave Device Address Register */118/* 0x18 : I2CD Slave Device Address Register */
113#define ASPEED_I2CD_DEV_ADDR_MASK GENMASK(6, 0)119#define ASPEED_I2CD_DEV_ADDR_MASK GENMASK(6, 0)
@@ -336,18 +342,19 @@ static void aspeed_i2c_do_start(struct aspeed_i2c_bus *bus) · 222 unmodified lines
336 struct i2c_msg *msg = &bus->msgs[bus->msgs_index];342 struct i2c_msg *msg = &bus->msgs[bus->msgs_index];
337 u8 slave_addr = i2c_8bit_addr_from_msg(msg);343 u8 slave_addr = i2c_8bit_addr_from_msg(msg);
338 344
339 bus->master_state = ASPEED_I2C_MASTER_START;
340
341#if IS_ENABLED(CONFIG_I2C_SLAVE)345#if IS_ENABLED(CONFIG_I2C_SLAVE)
342 /*346 /*
343 * If it's requested in the middle of a slave session, set the master347 * If it's requested in the middle of a slave session, set the master
344 * state to 'pending' then H/W will continue handling this master348 * state to 'pending' then H/W will continue handling this master
345 * command when the bus comes back to the idle state.349 * command when the bus comes back to the idle state.
346 */350 */
347 if (bus->slave_state != ASPEED_I2C_SLAVE_INACTIVE)351 if (bus->slave_state != ASPEED_I2C_SLAVE_INACTIVE) {
348 bus->master_state = ASPEED_I2C_MASTER_PENDING;352 bus->master_state = ASPEED_I2C_MASTER_PENDING;
353 return;
354 }
349#endif /* CONFIG_I2C_SLAVE */355#endif /* CONFIG_I2C_SLAVE */
350 356
357 bus->master_state = ASPEED_I2C_MASTER_START;
351 bus->buf_index = 0;358 bus->buf_index = 0;
352 359
353 if (msg->flags & I2C_M_RD) {360 if (msg->flags & I2C_M_RD) {
@@ -422,20 +429,6 @@ static u32 aspeed_i2c_master_irq(struct aspeed_i2c_bus *bus, u32 irq_status) · 68 unmodified lines
422 }429 }
423 }430 }
424 431
425#if IS_ENABLED(CONFIG_I2C_SLAVE)
426 /*
427 * A pending master command will be started by H/W when the bus comes
428 * back to idle state after completing a slave operation so change the
429 * master state from 'pending' to 'start' at here if slave is inactive.
430 */
431 if (bus->master_state == ASPEED_I2C_MASTER_PENDING) {
432 if (bus->slave_state != ASPEED_I2C_SLAVE_INACTIVE)
433 goto out_no_complete;
434
435 bus->master_state = ASPEED_I2C_MASTER_START;
436 }
437#endif /* CONFIG_I2C_SLAVE */
438
439 /* Master is not currently active, irq was for someone else. */432 /* Master is not currently active, irq was for someone else. */
440 if (bus->master_state == ASPEED_I2C_MASTER_INACTIVE ||433 if (bus->master_state == ASPEED_I2C_MASTER_INACTIVE ||
441 bus->master_state == ASPEED_I2C_MASTER_PENDING)434 bus->master_state == ASPEED_I2C_MASTER_PENDING)
@@ -462,11 +455,15 @@ static u32 aspeed_i2c_master_irq(struct aspeed_i2c_bus *bus, u32 irq_status) · 20 unmodified lines
462#if IS_ENABLED(CONFIG_I2C_SLAVE)455#if IS_ENABLED(CONFIG_I2C_SLAVE)
463 /*456 /*
464 * If a peer master starts a xfer immediately after it queues a457 * If a peer master starts a xfer immediately after it queues a
465 * master command, change its state to 'pending' then H/W will458 * master command, clear the queued master command and change
466 * continue the queued master xfer just after completing the459 * its state to 'pending'. To simplify handling of pending
467 * slave mode session.460 * cases, it uses S/W solution instead of H/W command queue
461 * handling.
468 */462 */
469 if (unlikely(irq_status & ASPEED_I2CD_INTR_SLAVE_MATCH)) {463 if (unlikely(irq_status & ASPEED_I2CD_INTR_SLAVE_MATCH)) {
464 writel(readl(bus->base + ASPEED_I2C_CMD_REG) &
465 ~ASPEED_I2CD_MASTER_CMDS_MASK,
466 bus->base + ASPEED_I2C_CMD_REG);
470 bus->master_state = ASPEED_I2C_MASTER_PENDING;467 bus->master_state = ASPEED_I2C_MASTER_PENDING;
471 dev_dbg(bus->dev,468 dev_dbg(bus->dev,
472 "master goes pending due to a slave start\n");469 "master goes pending due to a slave start\n");
@@ -629,6 +626,14 @@ static irqreturn_t aspeed_i2c_bus_irq(int irq, void *dev_id) · 156 unmodified lines
629 irq_handled |= aspeed_i2c_master_irq(bus,626 irq_handled |= aspeed_i2c_master_irq(bus,
630 irq_remaining);627 irq_remaining);
631 }628 }
629
630 /*
631 * Start a pending master command at here if a slave operation is
632 * completed.
633 */
634 if (bus->master_state == ASPEED_I2C_MASTER_PENDING &&
635 bus->slave_state == ASPEED_I2C_SLAVE_INACTIVE)
636 aspeed_i2c_do_start(bus);
632#else637#else
633 irq_handled = aspeed_i2c_master_irq(bus, irq_remaining);638 irq_handled = aspeed_i2c_master_irq(bus, irq_remaining);
634#endif /* CONFIG_I2C_SLAVE */639#endif /* CONFIG_I2C_SLAVE */
@@ -691,6 +696,15 @@ static int aspeed_i2c_master_xfer(struct i2c_adapter *adap, · 56 unmodified lines
691 ASPEED_I2CD_BUS_BUSY_STS))696 ASPEED_I2CD_BUS_BUSY_STS))
692 aspeed_i2c_recover_bus(bus);697 aspeed_i2c_recover_bus(bus);
693 698
699 /*
700 * If timed out and the state is still pending, drop the pending
701 * master command.
702 */
703 spin_lock_irqsave(&bus->lock, flags);
704 if (bus->master_state == ASPEED_I2C_MASTER_PENDING)
705 bus->master_state = ASPEED_I2C_MASTER_INACTIVE;
706 spin_unlock_irqrestore(&bus->lock, flags);
707
694 return -ETIMEDOUT;708 return -ETIMEDOUT;
695 }709 }
696 710
drivers/i2c/busses/i2c-mt65xx.c+1−1
@@ -875,7 +875,7 @@ static irqreturn_t mtk_i2c_irq(int irqno, void *dev_id) · 874 unmodified lines
875 875
876static u32 mtk_i2c_functionality(struct i2c_adapter *adap)876static u32 mtk_i2c_functionality(struct i2c_adapter *adap)
877{877{
878 if (adap->quirks->flags & I2C_AQ_NO_ZERO_LEN)878 if (i2c_check_quirks(adap, I2C_AQ_NO_ZERO_LEN))
879 return I2C_FUNC_I2C |879 return I2C_FUNC_I2C |
880 (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);880 (I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
881 else881 else
drivers/i2c/busses/i2c-stm32f7.c+13−8
@@ -305,7 +305,7 @@ struct stm32f7_i2c_dev { · 304 unmodified lines
305 struct regmap *regmap;305 struct regmap *regmap;
306};306};
307 307
308/**308/*
309 * All these values are coming from I2C Specification, Version 6.0, 4th of309 * All these values are coming from I2C Specification, Version 6.0, 4th of
310 * April 2014.310 * April 2014.
311 *311 *
@@ -1192,6 +1192,8 @@ static void stm32f7_i2c_slave_start(struct stm32f7_i2c_dev *i2c_dev) · 880 unmodified lines
1192 STM32F7_I2C_CR1_TXIE;1192 STM32F7_I2C_CR1_TXIE;
1193 stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, mask);1193 stm32f7_i2c_set_bits(base + STM32F7_I2C_CR1, mask);
1194 1194
1195 /* Write 1st data byte */
1196 writel_relaxed(value, base + STM32F7_I2C_TXDR);
1195 } else {1197 } else {
1196 /* Notify i2c slave that new write transfer is starting */1198 /* Notify i2c slave that new write transfer is starting */
1197 i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);1199 i2c_slave_event(slave, I2C_SLAVE_WRITE_REQUESTED, &value);
@@ -1501,7 +1503,7 @@ static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data) · 303 unmodified lines
1501 void __iomem *base = i2c_dev->base;1503 void __iomem *base = i2c_dev->base;
1502 struct device *dev = i2c_dev->dev;1504 struct device *dev = i2c_dev->dev;
1503 struct stm32_i2c_dma *dma = i2c_dev->dma;1505 struct stm32_i2c_dma *dma = i2c_dev->dma;
1504 u32 mask, status;1506 u32 status;
1505 1507
1506 status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);1508 status = readl_relaxed(i2c_dev->base + STM32F7_I2C_ISR);
1507 1509
@@ -1526,12 +1528,15 @@ static irqreturn_t stm32f7_i2c_isr_error(int irq, void *data) · 18 unmodified lines
1526 f7_msg->result = -EINVAL;1528 f7_msg->result = -EINVAL;
1527 }1529 }
1528 1530
1529 /* Disable interrupts */1531 if (!i2c_dev->slave_running) {
1530 if (stm32f7_i2c_is_slave_registered(i2c_dev))1532 u32 mask;
1531 mask = STM32F7_I2C_XFER_IRQ_MASK;1533 /* Disable interrupts */
1532 else1534 if (stm32f7_i2c_is_slave_registered(i2c_dev))
1533 mask = STM32F7_I2C_ALL_IRQ_MASK;1535 mask = STM32F7_I2C_XFER_IRQ_MASK;
1534 stm32f7_i2c_disable_irq(i2c_dev, mask);1536 else
1537 mask = STM32F7_I2C_ALL_IRQ_MASK;
1538 stm32f7_i2c_disable_irq(i2c_dev, mask);
1539 }
1535 1540
1536 /* Disable dma */1541 /* Disable dma */
1537 if (i2c_dev->use_dma) {1542 if (i2c_dev->use_dma) {

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