From: Shinya Kuribayashi Date: Fri, 6 Nov 2009 12:51:18 +0000 (+0900) Subject: i2c-designware: i2c_dw_xfer_msg: Fix error handling procedures X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8f588e40c788e63756ca1028c253f9f663d7d1c5;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git i2c-designware: i2c_dw_xfer_msg: Fix error handling procedures Current error handling procedures are not good in two respects: * Forgot to mark dev->cmd_complete as "completed" on errors Once an I2C transaction is initiated, wait_for_completion_ interruptible_timeout() waits for dev->cmd_complete to be completed. We have to take care of it whenever an error is detected, otherwise we will have a needless HZ timeout. * Forgot to disable interrupts In the previous patch, interrupt mask operations have been changed. We don't disable interrupts at the end of the interrupt handler any more, and try to keep RX_FULL (and TX_EMPTY if required) enabled during the transaction so that we can send longer data than the size of Tx/Rx FIFO. If an error is detected, we need to disable interrupts before quitting current transaction. We can work around above points using dev->msg_err effectively. Signed-off-by: Shinya Kuribayashi Signed-off-by: Ben Dooks --- diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c index 6acbe846e9c6..cb83671ff5fc 100644 --- a/drivers/i2c/busses/i2c-designware.c +++ b/drivers/i2c/busses/i2c-designware.c @@ -380,14 +380,18 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev) * reprogram the target address in the i2c * adapter when we are done with this transfer */ - if (msgs[dev->msg_write_idx].addr != addr) - return; + if (msgs[dev->msg_write_idx].addr != addr) { + dev_err(dev->dev, + "%s: invalid target address\n", __func__); + dev->msg_err = -EINVAL; + break; + } if (msgs[dev->msg_write_idx].len == 0) { dev_err(dev->dev, "%s: invalid message length\n", __func__); dev->msg_err = -EINVAL; - return; + break; } if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) { @@ -426,6 +430,9 @@ i2c_dw_xfer_msg(struct dw_i2c_dev *dev) if (dev->msg_write_idx == dev->msgs_num) intr_mask &= ~DW_IC_INTR_TX_EMPTY; + if (dev->msg_err) + intr_mask = 0; + writel(intr_mask, dev->base + DW_IC_INTR_MASK); } @@ -628,7 +635,7 @@ static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id) * the current transmit status. */ - if (stat & (DW_IC_INTR_TX_ABRT | DW_IC_INTR_STOP_DET)) + if ((stat & (DW_IC_INTR_TX_ABRT | DW_IC_INTR_STOP_DET)) || dev->msg_err) complete(&dev->cmd_complete); return IRQ_HANDLED;