diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/i2c/busses/i2c-tegra.c | 84 |
1 files changed, 69 insertions, 15 deletions
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 882b283e0ed7..0245fc2b5684 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -18,6 +18,7 @@ #include <linux/iopoll.h> #include <linux/irq.h> #include <linux/kernel.h> +#include <linux/ktime.h> #include <linux/module.h> #include <linux/of_device.h> #include <linux/pinctrl/consumer.h> @@ -247,6 +248,7 @@ struct tegra_i2c_hw_feature { * @dma_buf_size: DMA buffer size * @is_curr_dma_xfer: indicates active DMA transfer * @dma_complete: DMA completion notifier + * @is_curr_atomic_xfer: indicates active atomic transfer */ struct tegra_i2c_dev { struct device *dev; @@ -275,6 +277,7 @@ struct tegra_i2c_dev { unsigned int dma_buf_size; bool is_curr_dma_xfer; struct completion dma_complete; + bool is_curr_atomic_xfer; }; static void dvc_writel(struct tegra_i2c_dev *i2c_dev, u32 val, @@ -683,7 +686,8 @@ static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev) reg_offset = tegra_i2c_reg_addr(i2c_dev, I2C_CONFIG_LOAD); addr = i2c_dev->base + reg_offset; i2c_writel(i2c_dev, I2C_MSTR_CONFIG_LOAD, I2C_CONFIG_LOAD); - if (in_interrupt()) + + if (i2c_dev->is_curr_atomic_xfer) err = readl_poll_timeout_atomic(addr, val, val == 0, 1000, I2C_CONFIG_LOAD_TIMEOUT); @@ -984,24 +988,58 @@ out: } static unsigned long +tegra_i2c_poll_completion_timeout(struct tegra_i2c_dev *i2c_dev, + struct completion *complete, + unsigned int timeout_ms) +{ + ktime_t ktime = ktime_get(); + ktime_t ktimeout = ktime_add_ms(ktime, timeout_ms); + + do { + u32 status = i2c_readl(i2c_dev, I2C_INT_STATUS); + + if (status) { + tegra_i2c_isr(i2c_dev->irq, i2c_dev); + + if (completion_done(complete)) { + s64 delta = ktime_ms_delta(ktimeout, ktime); + + return msecs_to_jiffies(delta) ?: 1; + } + } + + ktime = ktime_get(); + + } while (ktime_before(ktime, ktimeout)); + + return 0; +} + +static unsigned long tegra_i2c_wait_completion_timeout(struct tegra_i2c_dev *i2c_dev, struct completion *complete, unsigned int timeout_ms) { unsigned long ret; - enable_irq(i2c_dev->irq); - ret = wait_for_completion_timeout(complete, - msecs_to_jiffies(timeout_ms)); - disable_irq(i2c_dev->irq); + if (i2c_dev->is_curr_atomic_xfer) { + ret = tegra_i2c_poll_completion_timeout(i2c_dev, complete, + timeout_ms); + } else { + enable_irq(i2c_dev->irq); + ret = wait_for_completion_timeout(complete, + msecs_to_jiffies(timeout_ms)); + disable_irq(i2c_dev->irq); - /* - * There is a chance that completion may happen after IRQ - * synchronization, which is done by disable_irq(). - */ - if (ret == 0 && completion_done(complete)) { - dev_warn(i2c_dev->dev, "completion done after timeout\n"); - ret = 1; + /* + * There is a chance that completion may happen after IRQ + * synchronization, which is done by disable_irq(). + */ + if (ret == 0 && completion_done(complete)) { + dev_warn(i2c_dev->dev, + "completion done after timeout\n"); + ret = 1; + } } return ret; @@ -1073,7 +1111,8 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev, xfer_size = ALIGN(xfer_size, BYTES_PER_FIFO_WORD); i2c_dev->is_curr_dma_xfer = (xfer_size > I2C_PIO_MODE_MAX_LEN) && - i2c_dev->dma_buf; + i2c_dev->dma_buf && + !i2c_dev->is_curr_atomic_xfer; tegra_i2c_config_fifo_trig(i2c_dev, xfer_size); dma = i2c_dev->is_curr_dma_xfer; /* @@ -1271,6 +1310,19 @@ static int tegra_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], return ret ?: i; } +static int tegra_i2c_xfer_atomic(struct i2c_adapter *adap, + struct i2c_msg msgs[], int num) +{ + struct tegra_i2c_dev *i2c_dev = i2c_get_adapdata(adap); + int ret; + + i2c_dev->is_curr_atomic_xfer = true; + ret = tegra_i2c_xfer(adap, msgs, num); + i2c_dev->is_curr_atomic_xfer = false; + + return ret; +} + static u32 tegra_i2c_func(struct i2c_adapter *adap) { struct tegra_i2c_dev *i2c_dev = i2c_get_adapdata(adap); @@ -1298,8 +1350,9 @@ static void tegra_i2c_parse_dt(struct tegra_i2c_dev *i2c_dev) } static const struct i2c_algorithm tegra_i2c_algo = { - .master_xfer = tegra_i2c_xfer, - .functionality = tegra_i2c_func, + .master_xfer = tegra_i2c_xfer, + .master_xfer_atomic = tegra_i2c_xfer_atomic, + .functionality = tegra_i2c_func, }; /* payload size is only 12 bit */ @@ -1607,6 +1660,7 @@ static int tegra_i2c_probe(struct platform_device *pdev) goto unprepare_fast_clk; } + pm_runtime_irq_safe(&pdev->dev); pm_runtime_enable(&pdev->dev); if (!pm_runtime_enabled(&pdev->dev)) { ret = tegra_i2c_runtime_resume(&pdev->dev); |