From: Anand Moon <linux.amoon@gmail.com> To: linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Kishon Vijay Abraham I <kishon@ti.com>, Vinod Koul <vkoul@kernel.org>, Kukjin Kim <kgene@kernel.org>, Krzysztof Kozlowski <krzk@kernel.org>, Marek Szyprowski <m.szyprowski@samsung.com>, Anand Moon <linux.amoon@gmail.com> Subject: [PATCH v5] phy: samsung: Use readl_poll_timeout function Date: Mon, 20 Jul 2020 17:35:02 +0000 [thread overview] Message-ID: <20200720173502.542-1-linux.amoon@gmail.com> (raw) 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@gmail.com> --- 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
WARNING: multiple messages have this Message-ID (diff)
From: Anand Moon <linux.amoon@gmail.com> To: linux-arm-kernel@lists.infradead.org, linux-usb@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Anand Moon <linux.amoon@gmail.com>, Krzysztof Kozlowski <krzk@kernel.org>, Kishon Vijay Abraham I <kishon@ti.com>, Vinod Koul <vkoul@kernel.org>, Kukjin Kim <kgene@kernel.org>, Marek Szyprowski <m.szyprowski@samsung.com> Subject: [PATCH v5] phy: samsung: Use readl_poll_timeout function Date: Mon, 20 Jul 2020 17:35:02 +0000 [thread overview] Message-ID: <20200720173502.542-1-linux.amoon@gmail.com> (raw) 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@gmail.com> --- 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2020-07-20 17:35 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-07-20 17:35 Anand Moon [this message] 2020-07-20 17:35 ` [PATCH v5] phy: samsung: Use readl_poll_timeout function Anand Moon 2020-08-23 14:06 ` Vinod Koul 2020-08-23 14:06 ` Vinod Koul
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