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Message-ID: <CAFp+6iE0DGZ722kqFmBSDSzKLJ38=n3yfzx8t8knncjGbuAkyA@mail.gmail.com>
Date: Thu, 25 Sep 2014 10:50:22 +0530
From: Vivek Gautam <gautam.vivek@...sung.com>
To: Greg KH <gregkh@...uxfoundation.org>
Cc: "linux-samsung-soc@...r.kernel.org"
<linux-samsung-soc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Alan Stern <stern@...land.harvard.edu>,
Kukjin Kim <kgene.kim@...sung.com>,
Jingoo Han <jg1.han@...sung.com>,
Vivek Gautam <gautam.vivek@...sung.com>,
Linux USB Mailing List <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] usb: host: ehci-exynos: Remove unnecessary usb-phy support
Hi Greg,
On Mon, Sep 22, 2014 at 11:15 AM, Vivek Gautam <gautam.vivek@...sung.com> wrote:
> Now that we have completely moved from older USB-PHY drivers
> to newer GENERIC-PHY drivers for PHYs available with USB controllers
> on Exynos series of SoCs, we can remove the support for the same
> in our host drivers too.
>
> We also defer the probe for our host in case we end up getting
> EPROBE_DEFER error when getting PHYs.
>
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> Acked-by: Jingoo Han <jg1.han@...sung.com>
> Acked-by: Alan Stern <stern@...land.harvard.edu>
> ---
Did this one got missed for usb-next ?
I can only see "usb: host: ohci-exynos: Remove unnecessary usb-phy support"
in the next branch.
Ignore me if you have already taken care of this, and plan to queue it up.
>
> Changes since v4:
> - returning 'ret' instead of PTR_ERR(phy), since ret is nothing but that only.
>
> Changes since v3:
> - Addressed review comments by Alan:
> -- Skipped renaming 'phy_number' variable,
> -- resorted to just adding minimal change required for phy assignment.
> -- updated patch description to mention EPROBE_DEFER support.
>
> drivers/usb/host/ehci-exynos.c | 74 +++++++++++-----------------------------
> 1 file changed, 20 insertions(+), 54 deletions(-)
>
> diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
> index 2eed9a4..7189f2e 100644
> --- a/drivers/usb/host/ehci-exynos.c
> +++ b/drivers/usb/host/ehci-exynos.c
> @@ -21,11 +21,8 @@
> #include <linux/of_gpio.h>
> #include <linux/phy/phy.h>
> #include <linux/platform_device.h>
> -#include <linux/usb/phy.h>
> -#include <linux/usb/samsung_usb_phy.h>
> #include <linux/usb.h>
> #include <linux/usb/hcd.h>
> -#include <linux/usb/otg.h>
>
> #include "ehci.h"
>
> @@ -47,9 +44,7 @@ static struct hc_driver __read_mostly exynos_ehci_hc_driver;
>
> struct exynos_ehci_hcd {
> struct clk *clk;
> - struct usb_phy *phy;
> - struct usb_otg *otg;
> - struct phy *phy_g[PHY_NUMBER];
> + struct phy *phy[PHY_NUMBER];
> };
>
> #define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
> @@ -60,8 +55,9 @@ static int exynos_ehci_get_phy(struct device *dev,
> struct device_node *child;
> struct phy *phy;
> int phy_number;
> - int ret = 0;
> + int ret;
>
> + /* Get PHYs for the controller */
> for_each_available_child_of_node(dev->of_node, child) {
> ret = of_property_read_u32(child, "reg", &phy_number);
> if (ret) {
> @@ -77,31 +73,21 @@ static int exynos_ehci_get_phy(struct device *dev,
> }
>
> phy = devm_of_phy_get(dev, child, NULL);
> + exynos_ehci->phy[phy_number] = phy;
> of_node_put(child);
> - if (IS_ERR(phy))
> - /* Lets fallback to older USB-PHYs */
> - goto usb_phy_old;
> - exynos_ehci->phy_g[phy_number] = phy;
> - /* Make the older PHYs unavailable */
> - exynos_ehci->phy = ERR_PTR(-ENXIO);
> - }
> -
> - return 0;
> -
> -usb_phy_old:
> - exynos_ehci->phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
> - if (IS_ERR(exynos_ehci->phy)) {
> - ret = PTR_ERR(exynos_ehci->phy);
> - if (ret != -ENXIO && ret != -ENODEV) {
> - dev_err(dev, "no usb2 phy configured\n");
> - return ret;
> + if (IS_ERR(phy)) {
> + ret = PTR_ERR(phy);
> + if (ret == -EPROBE_DEFER) {
> + return ret;
> + } else if (ret != -ENOSYS && ret != -ENODEV) {
> + dev_err(dev,
> + "Error retrieving usb2 phy: %d\n", ret);
> + return ret;
> + }
> }
> - dev_dbg(dev, "Failed to get usb2 phy\n");
> - } else {
> - exynos_ehci->otg = exynos_ehci->phy->otg;
> }
>
> - return ret;
> + return 0;
> }
>
> static int exynos_ehci_phy_enable(struct device *dev)
> @@ -111,16 +97,13 @@ static int exynos_ehci_phy_enable(struct device *dev)
> int i;
> int ret = 0;
>
> - if (!IS_ERR(exynos_ehci->phy))
> - return usb_phy_init(exynos_ehci->phy);
> -
> for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
> - if (!IS_ERR(exynos_ehci->phy_g[i]))
> - ret = phy_power_on(exynos_ehci->phy_g[i]);
> + if (!IS_ERR(exynos_ehci->phy[i]))
> + ret = phy_power_on(exynos_ehci->phy[i]);
> if (ret)
> for (i--; i >= 0; i--)
> - if (!IS_ERR(exynos_ehci->phy_g[i]))
> - phy_power_off(exynos_ehci->phy_g[i]);
> + if (!IS_ERR(exynos_ehci->phy[i]))
> + phy_power_off(exynos_ehci->phy[i]);
>
> return ret;
> }
> @@ -131,14 +114,9 @@ static void exynos_ehci_phy_disable(struct device *dev)
> struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
> int i;
>
> - if (!IS_ERR(exynos_ehci->phy)) {
> - usb_phy_shutdown(exynos_ehci->phy);
> - return;
> - }
> -
> for (i = 0; i < PHY_NUMBER; i++)
> - if (!IS_ERR(exynos_ehci->phy_g[i]))
> - phy_power_off(exynos_ehci->phy_g[i]);
> + if (!IS_ERR(exynos_ehci->phy[i]))
> + phy_power_off(exynos_ehci->phy[i]);
> }
>
> static void exynos_setup_vbus_gpio(struct device *dev)
> @@ -231,9 +209,6 @@ skip_phy:
> goto fail_io;
> }
>
> - if (exynos_ehci->otg)
> - exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
> -
> err = exynos_ehci_phy_enable(&pdev->dev);
> if (err) {
> dev_err(&pdev->dev, "Failed to enable USB phy\n");
> @@ -273,9 +248,6 @@ static int exynos_ehci_remove(struct platform_device *pdev)
>
> usb_remove_hcd(hcd);
>
> - if (exynos_ehci->otg)
> - exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
> -
> exynos_ehci_phy_disable(&pdev->dev);
>
> clk_disable_unprepare(exynos_ehci->clk);
> @@ -298,9 +270,6 @@ static int exynos_ehci_suspend(struct device *dev)
> if (rc)
> return rc;
>
> - if (exynos_ehci->otg)
> - exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
> -
> exynos_ehci_phy_disable(dev);
>
> clk_disable_unprepare(exynos_ehci->clk);
> @@ -316,9 +285,6 @@ static int exynos_ehci_resume(struct device *dev)
>
> clk_prepare_enable(exynos_ehci->clk);
>
> - if (exynos_ehci->otg)
> - exynos_ehci->otg->set_host(exynos_ehci->otg, &hcd->self);
> -
> ret = exynos_ehci_phy_enable(dev);
> if (ret) {
> dev_err(dev, "Failed to enable USB phy\n");
> --
> 1.7.10.4
>
--
Best Regards
Vivek Gautam
Samsung R&D Institute, Bangalore
India
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