i2c: xiic: Add timeout to the rx fifo wait loop
Add timeout to the rx fifo empty wait loop. Also check for the return value for xiic_reinit and pass it to xiic_start_xfer. Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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@ -156,6 +156,8 @@ struct xiic_i2c {
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#define XIIC_RESET_MASK 0xAUL
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#define XIIC_PM_TIMEOUT 1000 /* ms */
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/* timeout waiting for the controller to respond */
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#define XIIC_I2C_TIMEOUT (msecs_to_jiffies(1000))
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/*
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* The following constant is used for the device global interrupt enable
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* register, to enable all interrupts for the device, this is the only bit
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@ -166,7 +168,7 @@ struct xiic_i2c {
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#define xiic_tx_space(i2c) ((i2c)->tx_msg->len - (i2c)->tx_pos)
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#define xiic_rx_space(i2c) ((i2c)->rx_msg->len - (i2c)->rx_pos)
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static void xiic_start_xfer(struct xiic_i2c *i2c);
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static int xiic_start_xfer(struct xiic_i2c *i2c);
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static void __xiic_start_xfer(struct xiic_i2c *i2c);
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/*
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@ -247,17 +249,29 @@ static inline void xiic_irq_clr_en(struct xiic_i2c *i2c, u32 mask)
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xiic_irq_en(i2c, mask);
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}
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static void xiic_clear_rx_fifo(struct xiic_i2c *i2c)
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static int xiic_clear_rx_fifo(struct xiic_i2c *i2c)
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{
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u8 sr;
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unsigned long timeout;
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timeout = jiffies + XIIC_I2C_TIMEOUT;
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for (sr = xiic_getreg8(i2c, XIIC_SR_REG_OFFSET);
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!(sr & XIIC_SR_RX_FIFO_EMPTY_MASK);
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sr = xiic_getreg8(i2c, XIIC_SR_REG_OFFSET))
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sr = xiic_getreg8(i2c, XIIC_SR_REG_OFFSET)) {
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xiic_getreg8(i2c, XIIC_DRR_REG_OFFSET);
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if (time_after(jiffies, timeout)) {
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dev_err(i2c->dev, "Failed to clear rx fifo\n");
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return -ETIMEDOUT;
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}
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}
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return 0;
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}
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static void xiic_reinit(struct xiic_i2c *i2c)
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static int xiic_reinit(struct xiic_i2c *i2c)
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{
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int ret;
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xiic_setreg32(i2c, XIIC_RESETR_OFFSET, XIIC_RESET_MASK);
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/* Set receive Fifo depth to maximum (zero based). */
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@ -270,12 +284,16 @@ static void xiic_reinit(struct xiic_i2c *i2c)
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xiic_setreg8(i2c, XIIC_CR_REG_OFFSET, XIIC_CR_ENABLE_DEVICE_MASK);
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/* make sure RX fifo is empty */
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xiic_clear_rx_fifo(i2c);
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ret = xiic_clear_rx_fifo(i2c);
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if (ret)
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return ret;
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/* Enable interrupts */
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xiic_setreg32(i2c, XIIC_DGIER_OFFSET, XIIC_GINTR_ENABLE_MASK);
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xiic_irq_clr_en(i2c, XIIC_INTR_ARB_LOST_MASK);
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return 0;
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}
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static void xiic_deinit(struct xiic_i2c *i2c)
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@ -655,12 +673,18 @@ static void __xiic_start_xfer(struct xiic_i2c *i2c)
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}
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static void xiic_start_xfer(struct xiic_i2c *i2c)
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static int xiic_start_xfer(struct xiic_i2c *i2c)
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{
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int ret;
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mutex_lock(&i2c->lock);
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xiic_reinit(i2c);
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__xiic_start_xfer(i2c);
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ret = xiic_reinit(i2c);
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if (!ret)
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__xiic_start_xfer(i2c);
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mutex_unlock(&i2c->lock);
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return ret;
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}
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static int xiic_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
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@ -682,7 +706,11 @@ static int xiic_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
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i2c->tx_msg = msgs;
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i2c->nmsgs = num;
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xiic_start_xfer(i2c);
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err = xiic_start_xfer(i2c);
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if (err < 0) {
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dev_err(adap->dev.parent, "Error xiic_start_xfer\n");
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goto out;
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}
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if (wait_event_timeout(i2c->wait, (i2c->state == STATE_ERROR) ||
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(i2c->state == STATE_DONE), HZ)) {
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@ -794,7 +822,11 @@ static int xiic_i2c_probe(struct platform_device *pdev)
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if (!(sr & XIIC_SR_TX_FIFO_EMPTY_MASK))
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i2c->endianness = BIG;
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xiic_reinit(i2c);
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ret = xiic_reinit(i2c);
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if (ret < 0) {
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dev_err(&pdev->dev, "Cannot xiic_reinit\n");
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goto err_clk_dis;
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}
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/* add i2c adapter to i2c tree */
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ret = i2c_add_adapter(&i2c->adap);
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