2021-04-28 10:44:52 -04:00
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https://patchwork.ozlabs.org/project/uboot/patch/20210406151059.1187379-1-icenowy@aosc.io
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From: Icenowy Zheng <icenowy@aosc.io>
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To: Simon Glass <sjg@chromium.org>, Kever Yang <kever.yang@rock-chips.com>,
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Frank Wang <frank.wang@rock-chips.com>,
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Jagan Teki <jagan@amarulasolutions.com>
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Cc: u-boot@lists.denx.de,
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Icenowy Zheng <icenowy@aosc.io>
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Subject: [PATCH] phy: rockchip: inno-usb2: fix hang when multiple controllers
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exit
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Date: Tue, 6 Apr 2021 23:10:59 +0800
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Message-Id: <20210406151059.1187379-1-icenowy@aosc.io>
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The OHCI and EHCI controllers are both bound to the same PHY. They will
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both do init and power_on operations when the controller is brought up
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and both do power_off and exit when the controller is stopped. However,
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the PHY uclass of U-Boot is not as sane as we thought -- they won't
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maintain a status mark for PHYs, and thus the functions of the PHYs
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could be called for multiple times. Calling init/power_on for multiple
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times have no severe problems, however calling power_off/exit for
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multiple times have a problem -- the first exit call will stop the PHY
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clock, and power_off/exit calls after it still trying to write to PHY
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registers. The write operation to PHY registers will fail because clock
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is already stopped.
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Adapt the count mechanism from phy-sun4i-usb to both init/exit and
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power_on/power_off functions to phy-rockchip-inno-usb2 to fix this
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problem. With this stopping USB controllers (manually or before booting
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a kernel) will work.
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Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
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Fixes: ac97a9ece14e ("phy: rockchip: Add Rockchip USB2PHY driver")
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Tested-by: Peter Robinson <pbrobinson@gmail.com>
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---
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drivers/phy/rockchip/phy-rockchip-inno-usb2.c | 21 +++++++++++++++++++
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1 file changed, 21 insertions(+)
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diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
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2023-11-27 03:33:47 -05:00
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index 70e61eccb7..ce36db94a7 100644
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2021-04-28 10:44:52 -04:00
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--- a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
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+++ b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
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2023-11-27 03:33:47 -05:00
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@@ -64,6 +64,8 @@ struct rockchip_usb2phy {
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2021-04-28 10:44:52 -04:00
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void *reg_base;
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struct clk phyclk;
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const struct rockchip_usb2phy_cfg *phy_cfg;
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+ int init_count;
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+ int power_on_count;
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};
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static inline int property_enable(void *reg_base,
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2023-11-27 03:33:47 -05:00
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@@ -106,6 +108,10 @@ static int rockchip_usb2phy_power_on(struct phy *phy)
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2021-04-28 10:44:52 -04:00
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struct rockchip_usb2phy *priv = dev_get_priv(parent);
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const struct rockchip_usb2phy_port_cfg *port_cfg = us2phy_get_port(phy);
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+ priv->power_on_count++;
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+ if (priv->power_on_count != 1)
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+ return 0;
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+
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property_enable(priv->reg_base, &port_cfg->phy_sus, false);
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/* waiting for the utmi_clk to become stable */
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2023-11-27 03:33:47 -05:00
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@@ -120,6 +126,10 @@ static int rockchip_usb2phy_power_off(struct phy *phy)
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2021-04-28 10:44:52 -04:00
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struct rockchip_usb2phy *priv = dev_get_priv(parent);
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const struct rockchip_usb2phy_port_cfg *port_cfg = us2phy_get_port(phy);
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+ priv->power_on_count--;
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+ if (priv->power_on_count != 0)
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+ return 0;
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+
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property_enable(priv->reg_base, &port_cfg->phy_sus, true);
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return 0;
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2023-11-27 03:33:47 -05:00
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@@ -132,6 +142,10 @@ static int rockchip_usb2phy_init(struct phy *phy)
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2021-04-28 10:44:52 -04:00
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const struct rockchip_usb2phy_port_cfg *port_cfg = us2phy_get_port(phy);
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int ret;
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+ priv->init_count++;
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+ if (priv->init_count != 1)
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+ return 0;
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+
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ret = clk_enable(&priv->phyclk);
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2023-11-27 03:33:47 -05:00
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if (ret && ret != -ENOSYS) {
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2021-04-28 10:44:52 -04:00
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dev_err(phy->dev, "failed to enable phyclk (ret=%d)\n", ret);
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2023-11-27 03:33:47 -05:00
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@@ -154,6 +168,10 @@ static int rockchip_usb2phy_exit(struct phy *phy)
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2021-04-28 10:44:52 -04:00
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struct udevice *parent = dev_get_parent(phy->dev);
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struct rockchip_usb2phy *priv = dev_get_priv(parent);
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+ priv->init_count--;
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+ if (priv->init_count != 0)
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+ return 0;
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+
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clk_disable(&priv->phyclk);
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return 0;
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2023-11-27 03:33:47 -05:00
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@@ -294,6 +312,9 @@ static int rockchip_usb2phy_probe(struct udevice *dev)
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2021-04-28 10:44:52 -04:00
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return ret;
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}
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+ priv->power_on_count = 0;
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+ priv->init_count = 0;
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+
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return 0;
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}
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