diff options
| author | Shardar Shariff Md <smohammed@nvidia.com> | 2016-08-31 18:58:40 +0530 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2016-09-08 22:32:46 +0200 |
| commit | 685143a1598b36227250f6c0a90ec234218f58ff (patch) | |
| tree | 2e1a6dd0ff908afe3b773e0fa542947a6d67a230 | |
| parent | 17f80487f653dfcc6cc3a8b64891442dc4182f62 (diff) | |
i2c: tegra: use readl_poll_timeout after config_load reg programmed
After CONFIG_LOAD register is programmed instead of explicitly waiting
for timeout, use readl_poll_timeout() to check for register value to get
updated or wait till timeout.
Signed-off-by: Shardar Shariff Md <smohammed@nvidia.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| -rw-r--r-- | drivers/i2c/busses/i2c-tegra.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index d86a993b75d6..e93c72aec555 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -30,6 +30,7 @@ #include <linux/reset.h> #include <linux/pinctrl/consumer.h> #include <linux/pm_runtime.h> +#include <linux/iopoll.h> #include <asm/unaligned.h> @@ -112,6 +113,8 @@ #define I2C_CLKEN_OVERRIDE 0x090 #define I2C_MST_CORE_CLKEN_OVR BIT(0) +#define I2C_CONFIG_LOAD_TIMEOUT 1000000 + /* * msg_end_type: The bus control which need to be send at end of transfer. * @MSG_END_STOP: Send stop pulse at end of transfer. @@ -448,7 +451,6 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) u32 val; int err; u32 clk_divisor; - unsigned long timeout = jiffies + HZ; err = pm_runtime_get_sync(i2c_dev->dev); if (err < 0) { @@ -497,15 +499,18 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) i2c_writel(i2c_dev, I2C_MST_CORE_CLKEN_OVR, I2C_CLKEN_OVERRIDE); if (i2c_dev->hw->has_config_load_reg) { + unsigned long reg_offset; + void __iomem *addr; + + 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); - while (i2c_readl(i2c_dev, I2C_CONFIG_LOAD) != 0) { - if (time_after(jiffies, timeout)) { - dev_warn(i2c_dev->dev, - "timeout waiting for config load\n"); - err = -ETIMEDOUT; - goto err; - } - msleep(1); + err = readl_poll_timeout(addr, val, val == 0, 1000, + I2C_CONFIG_LOAD_TIMEOUT); + if (err) { + dev_warn(i2c_dev->dev, + "timeout waiting for config load\n"); + goto err; } } |