Instead of a busy waiting while loop using udelay use readl_poll_timeout function to check the condition is met or timeout occurs in crport_handshake function. readl_poll_timeout is called in non atomic context so it safe to sleep until the condition is met. Signed-off-by: Anand Moon <linux.amoon@xxxxxxxxx> --- Changes v5: --Fix the indentation, checkpatch warning. --Drop the Fix tags. Changes v4: Rebased on to of patch [0] https://patchwork.kernel.org/patch/11651673/ --Fix the commit message. --Fix the error timeout condition for -ETIMEDOUT Changes v3: --Fix the commit message. --Drop the variable, used the value directly. Changes v2: --used the default timeout values. --Added missing Fixed tags. --- drivers/phy/samsung/phy-exynos5-usbdrd.c | 39 ++++++++---------------- 1 file changed, 12 insertions(+), 27 deletions(-) diff --git a/drivers/phy/samsung/phy-exynos5-usbdrd.c b/drivers/phy/samsung/phy-exynos5-usbdrd.c index 7f6279fb4f8f..c45ed9cabc5e 100644 --- a/drivers/phy/samsung/phy-exynos5-usbdrd.c +++ b/drivers/phy/samsung/phy-exynos5-usbdrd.c @@ -16,6 +16,7 @@ #include <linux/of.h> #include <linux/of_address.h> #include <linux/of_device.h> +#include <linux/iopoll.h> #include <linux/phy/phy.h> #include <linux/platform_device.h> #include <linux/mutex.h> @@ -556,41 +557,25 @@ static int exynos5_usbdrd_phy_power_off(struct phy *phy) static int crport_handshake(struct exynos5_usbdrd_phy *phy_drd, u32 val, u32 cmd) { - u32 usec = 100; unsigned int result; + int err; writel(val | cmd, phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0); - do { - result = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYREG1); - if (result & PHYREG1_CR_ACK) - break; - - udelay(1); - } while (usec-- > 0); - - if (!usec) { - dev_err(phy_drd->dev, - "CRPORT handshake timeout1 (0x%08x)\n", val); - return -ETIME; + err = readl_poll_timeout(phy_drd->reg_phy + EXYNOS5_DRD_PHYREG1, + result, (result & PHYREG1_CR_ACK), 1, 100); + if (err == -ETIMEDOUT) { + dev_err(phy_drd->dev, "CRPORT handshake timeout1 (0x%08x)\n", val); + return err; } - usec = 100; - writel(val, phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0); - do { - result = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYREG1); - if (!(result & PHYREG1_CR_ACK)) - break; - - udelay(1); - } while (usec-- > 0); - - if (!usec) { - dev_err(phy_drd->dev, - "CRPORT handshake timeout2 (0x%08x)\n", val); - return -ETIME; + err = readl_poll_timeout(phy_drd->reg_phy + EXYNOS5_DRD_PHYREG1, + result, !(result & PHYREG1_CR_ACK), 1, 100); + if (err == -ETIMEDOUT) { + dev_err(phy_drd->dev, "CRPORT handshake timeout2 (0x%08x)\n", val); + return err; } return 0; -- 2.27.0
