On Tue, Jul 07, 2020 at 09:59:08AM +0000, Anand Moon wrote:
> Instead of a busy waiting loop while loop using udelay
You doubled "loop".
> use readl_poll_timeout function to check the condition
> is met or timeout occurs in crport_handshake function.
Still you did not mention that you convert the function to use sleeping
primitive. You also did not mention whether it is actually allowed in
this context and I am not sure if you investigated it.
Best regards,
Krzysztof
>
> Fixes: d8c80bb3b55b ("phy: exynos5-usbdrd: Calibrate LOS levels for exynos5420/5800")
> Signed-off-by: Anand Moon <linux.amoon@xxxxxxxxx>
> ---
> 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 | 35 +++++++-----------------
> 1 file changed, 10 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/phy/samsung/phy-exynos5-usbdrd.c b/drivers/phy/samsung/phy-exynos5-usbdrd.c
> index e510732afb8b..fa75fa88da33 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>
> @@ -556,40 +557,24 @@ 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);
> + err = readl_poll_timeout(phy_drd->reg_phy + EXYNOS5_DRD_PHYREG1,
> + result, (result & PHYREG1_CR_ACK), 1, 100);
> + if (err) {
> + dev_err(phy_drd->dev, "CRPORT handshake timeout1 (0x%08x)\n", val);
> return -ETIME;
> }
>
> - 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);
> + err = readl_poll_timeout(phy_drd->reg_phy + EXYNOS5_DRD_PHYREG1,
> + result, !(result & PHYREG1_CR_ACK), 1, 100);
> + if (err) {
> + dev_err(phy_drd->dev, "CRPORT handshake timeout2 (0x%08x)\n", val);
> return -ETIME;
> }
>
> --
> 2.27.0
>
