From: Amjad Ouled-Ameur <aouledameur@baylibre.com> To: khilman@baylibre.com Cc: Amjad Ouled-Ameur <aouledameur@baylibre.com>, p.zabel@pengutronix.de, balbi@kernel.org, jbrunet@baylibre.com, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Subject: [PATCH v5 3/3] phy: amlogic: meson8b-usb2: fix shared reset control use Date: Sun, 12 Dec 2021 21:18:44 +0100 [thread overview] Message-ID: <20211212201844.114949-4-aouledameur@baylibre.com> (raw) In-Reply-To: <20211212201844.114949-1-aouledameur@baylibre.com> Use reset_control_rearm() call if an error occurs in case phy_meson8b_usb2_power_on() fails after reset() has been called, or in case phy_meson8b_usb2_power_off() is called i.e the resource is no longer used and the reset line may be triggered again by other devices. reset_control_rearm() keeps use of triggered_count sane in the reset framework, use of reset_control_reset() on shared reset line should be balanced with reset_control_rearm(). Signed-off-by: Amjad Ouled-Ameur <aouledameur@baylibre.com> Reported-by: Jerome Brunet <jbrunet@baylibre.com> --- drivers/phy/amlogic/phy-meson8b-usb2.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/phy/amlogic/phy-meson8b-usb2.c b/drivers/phy/amlogic/phy-meson8b-usb2.c index 77e7e9b1428c..dd96763911b8 100644 --- a/drivers/phy/amlogic/phy-meson8b-usb2.c +++ b/drivers/phy/amlogic/phy-meson8b-usb2.c @@ -154,6 +154,7 @@ static int phy_meson8b_usb2_power_on(struct phy *phy) ret = clk_prepare_enable(priv->clk_usb_general); if (ret) { dev_err(&phy->dev, "Failed to enable USB general clock\n"); + reset_control_rearm(priv->reset); return ret; } @@ -161,6 +162,7 @@ static int phy_meson8b_usb2_power_on(struct phy *phy) if (ret) { dev_err(&phy->dev, "Failed to enable USB DDR clock\n"); clk_disable_unprepare(priv->clk_usb_general); + reset_control_rearm(priv->reset); return ret; } @@ -199,6 +201,7 @@ static int phy_meson8b_usb2_power_on(struct phy *phy) dev_warn(&phy->dev, "USB ID detect failed!\n"); clk_disable_unprepare(priv->clk_usb); clk_disable_unprepare(priv->clk_usb_general); + reset_control_rearm(priv->reset); return -EINVAL; } } @@ -218,6 +221,7 @@ static int phy_meson8b_usb2_power_off(struct phy *phy) clk_disable_unprepare(priv->clk_usb); clk_disable_unprepare(priv->clk_usb_general); + reset_control_rearm(priv->reset); /* power off the PHY by putting it into reset mode */ regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET, -- 2.25.1 _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic
WARNING: multiple messages have this Message-ID (diff)
From: Amjad Ouled-Ameur <aouledameur@baylibre.com> To: khilman@baylibre.com Cc: Amjad Ouled-Ameur <aouledameur@baylibre.com>, p.zabel@pengutronix.de, balbi@kernel.org, jbrunet@baylibre.com, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Subject: [PATCH v5 3/3] phy: amlogic: meson8b-usb2: fix shared reset control use Date: Sun, 12 Dec 2021 21:18:44 +0100 [thread overview] Message-ID: <20211212201844.114949-4-aouledameur@baylibre.com> (raw) In-Reply-To: <20211212201844.114949-1-aouledameur@baylibre.com> Use reset_control_rearm() call if an error occurs in case phy_meson8b_usb2_power_on() fails after reset() has been called, or in case phy_meson8b_usb2_power_off() is called i.e the resource is no longer used and the reset line may be triggered again by other devices. reset_control_rearm() keeps use of triggered_count sane in the reset framework, use of reset_control_reset() on shared reset line should be balanced with reset_control_rearm(). Signed-off-by: Amjad Ouled-Ameur <aouledameur@baylibre.com> Reported-by: Jerome Brunet <jbrunet@baylibre.com> --- drivers/phy/amlogic/phy-meson8b-usb2.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/phy/amlogic/phy-meson8b-usb2.c b/drivers/phy/amlogic/phy-meson8b-usb2.c index 77e7e9b1428c..dd96763911b8 100644 --- a/drivers/phy/amlogic/phy-meson8b-usb2.c +++ b/drivers/phy/amlogic/phy-meson8b-usb2.c @@ -154,6 +154,7 @@ static int phy_meson8b_usb2_power_on(struct phy *phy) ret = clk_prepare_enable(priv->clk_usb_general); if (ret) { dev_err(&phy->dev, "Failed to enable USB general clock\n"); + reset_control_rearm(priv->reset); return ret; } @@ -161,6 +162,7 @@ static int phy_meson8b_usb2_power_on(struct phy *phy) if (ret) { dev_err(&phy->dev, "Failed to enable USB DDR clock\n"); clk_disable_unprepare(priv->clk_usb_general); + reset_control_rearm(priv->reset); return ret; } @@ -199,6 +201,7 @@ static int phy_meson8b_usb2_power_on(struct phy *phy) dev_warn(&phy->dev, "USB ID detect failed!\n"); clk_disable_unprepare(priv->clk_usb); clk_disable_unprepare(priv->clk_usb_general); + reset_control_rearm(priv->reset); return -EINVAL; } } @@ -218,6 +221,7 @@ static int phy_meson8b_usb2_power_off(struct phy *phy) clk_disable_unprepare(priv->clk_usb); clk_disable_unprepare(priv->clk_usb_general); + reset_control_rearm(priv->reset); /* power off the PHY by putting it into reset mode */ regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET, -- 2.25.1
next prev parent reply other threads:[~2021-12-12 20:19 UTC|newest] Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-12-12 20:18 [PATCH v5 0/3] usb: meson: fix shared reset control use Amjad Ouled-Ameur 2021-12-12 20:18 ` Amjad Ouled-Ameur 2021-12-12 20:18 ` [PATCH v5 1/3] phy: amlogic: phy-meson-gxl-usb2: fix shared reset controller use Amjad Ouled-Ameur 2021-12-12 20:18 ` Amjad Ouled-Ameur 2021-12-12 20:44 ` Martin Blumenstingl 2021-12-12 20:44 ` Martin Blumenstingl 2021-12-13 9:16 ` Philipp Zabel 2021-12-13 9:16 ` Philipp Zabel 2021-12-12 20:18 ` [PATCH v5 2/3] phy: amlogic: meson8b-usb2: Use dev_err_probe() Amjad Ouled-Ameur 2021-12-12 20:18 ` Amjad Ouled-Ameur 2021-12-12 20:43 ` Martin Blumenstingl 2021-12-12 20:43 ` Martin Blumenstingl 2021-12-12 20:18 ` Amjad Ouled-Ameur [this message] 2021-12-12 20:18 ` [PATCH v5 3/3] phy: amlogic: meson8b-usb2: fix shared reset control use Amjad Ouled-Ameur 2021-12-12 20:44 ` Martin Blumenstingl 2021-12-12 20:44 ` Martin Blumenstingl 2021-12-13 13:30 ` [PATCH v5 0/3] usb: meson: " Neil Armstrong 2021-12-13 13:30 ` Neil Armstrong 2022-01-06 19:06 ` Kevin Hilman 2022-01-06 19:06 ` Kevin Hilman
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