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    Subject[PATCH 5.7 152/166] pinctrl: baytrail: Fix pin being driven low for a while on gpiod_get(..., GPIOD_OUT_HIGH)
    Date
    From: Hans de Goede <hdegoede@redhat.com>

    commit 45c11a927606c612e4898a9484867b71318699f6 upstream.

    The pins on the Bay Trail SoC have separate input-buffer and output-buffer
    enable bits and a read of the level bit of the value register will always
    return the value from the input-buffer.

    The BIOS of a device may configure a pin in output-only mode, only enabling
    the output buffer, and write 1 to the level bit to drive the pin high.
    This 1 written to the level bit will be stored inside the data-latch of the
    output buffer.

    But a subsequent read of the value register will return 0 for the level bit
    because the input-buffer is disabled. This causes a read-modify-write as
    done by byt_gpio_set_direction() to write 0 to the level bit, driving the
    pin low!

    Before this commit byt_gpio_direction_output() relied on
    pinctrl_gpio_direction_output() to set the direction, followed by a call
    to byt_gpio_set() to apply the selected value. This causes the pin to
    go low between the pinctrl_gpio_direction_output() and byt_gpio_set()
    calls.

    Change byt_gpio_direction_output() to directly make the register
    modifications itself instead. Replacing the 2 subsequent writes to the
    value register with a single write.

    Note that the pinctrl code does not keep track internally of the direction,
    so not going through pinctrl_gpio_direction_output() is not an issue.

    This issue was noticed on a Trekstor SurfTab Twin 10.1. When the panel is
    already on at boot (no external monitor connected), then the i915 driver
    does a gpiod_get(..., GPIOD_OUT_HIGH) for the panel-enable GPIO. The
    temporarily going low of that GPIO was causing the panel to reset itself
    after which it would not show an image until it was turned off and back on
    again (until a full modeset was done on it). This commit fixes this.

    This commit also updates the byt_gpio_direction_input() to use direct
    register accesses instead of going through pinctrl_gpio_direction_input(),
    to keep it consistent with byt_gpio_direction_output().

    Note for backporting, this commit depends on:
    commit e2b74419e5cc ("pinctrl: baytrail: Replace WARN with dev_info_once
    when setting direct-irq pin to output")

    Cc: stable@vger.kernel.org
    Fixes: 86e3ef812fe3 ("pinctrl: baytrail: Update gpio chip operations")
    Signed-off-by: Hans de Goede <hdegoede@redhat.com>
    Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
    Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/pinctrl/intel/pinctrl-baytrail.c | 67 ++++++++++++++++++++++++-------
    1 file changed, 53 insertions(+), 14 deletions(-)

    --- a/drivers/pinctrl/intel/pinctrl-baytrail.c
    +++ b/drivers/pinctrl/intel/pinctrl-baytrail.c
    @@ -800,6 +800,21 @@ static void byt_gpio_disable_free(struct
    pm_runtime_put(vg->dev);
    }

    +static void byt_gpio_direct_irq_check(struct intel_pinctrl *vg,
    + unsigned int offset)
    +{
    + void __iomem *conf_reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);
    +
    + /*
    + * Before making any direction modifications, do a check if gpio is set
    + * for direct IRQ. On Bay Trail, setting GPIO to output does not make
    + * sense, so let's at least inform the caller before they shoot
    + * themselves in the foot.
    + */
    + if (readl(conf_reg) & BYT_DIRECT_IRQ_EN)
    + dev_info_once(vg->dev, "Potential Error: Setting GPIO with direct_irq_en to output");
    +}
    +
    static int byt_gpio_set_direction(struct pinctrl_dev *pctl_dev,
    struct pinctrl_gpio_range *range,
    unsigned int offset,
    @@ -807,7 +822,6 @@ static int byt_gpio_set_direction(struct
    {
    struct intel_pinctrl *vg = pinctrl_dev_get_drvdata(pctl_dev);
    void __iomem *val_reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
    - void __iomem *conf_reg = byt_gpio_reg(vg, offset, BYT_CONF0_REG);
    unsigned long flags;
    u32 value;

    @@ -817,14 +831,8 @@ static int byt_gpio_set_direction(struct
    value &= ~BYT_DIR_MASK;
    if (input)
    value |= BYT_OUTPUT_EN;
    - else if (readl(conf_reg) & BYT_DIRECT_IRQ_EN)
    - /*
    - * Before making any direction modifications, do a check if gpio
    - * is set for direct IRQ. On baytrail, setting GPIO to output
    - * does not make sense, so let's at least inform the caller before
    - * they shoot themselves in the foot.
    - */
    - dev_info_once(vg->dev, "Potential Error: Setting GPIO with direct_irq_en to output");
    + else
    + byt_gpio_direct_irq_check(vg, offset);

    writel(value, val_reg);

    @@ -1165,19 +1173,50 @@ static int byt_gpio_get_direction(struct

    static int byt_gpio_direction_input(struct gpio_chip *chip, unsigned int offset)
    {
    - return pinctrl_gpio_direction_input(chip->base + offset);
    + struct intel_pinctrl *vg = gpiochip_get_data(chip);
    + void __iomem *val_reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
    + unsigned long flags;
    + u32 reg;
    +
    + raw_spin_lock_irqsave(&byt_lock, flags);
    +
    + reg = readl(val_reg);
    + reg &= ~BYT_DIR_MASK;
    + reg |= BYT_OUTPUT_EN;
    + writel(reg, val_reg);
    +
    + raw_spin_unlock_irqrestore(&byt_lock, flags);
    + return 0;
    }

    +/*
    + * Note despite the temptation this MUST NOT be converted into a call to
    + * pinctrl_gpio_direction_output() + byt_gpio_set() that does not work this
    + * MUST be done as a single BYT_VAL_REG register write.
    + * See the commit message of the commit adding this comment for details.
    + */
    static int byt_gpio_direction_output(struct gpio_chip *chip,
    unsigned int offset, int value)
    {
    - int ret = pinctrl_gpio_direction_output(chip->base + offset);
    + struct intel_pinctrl *vg = gpiochip_get_data(chip);
    + void __iomem *val_reg = byt_gpio_reg(vg, offset, BYT_VAL_REG);
    + unsigned long flags;
    + u32 reg;

    - if (ret)
    - return ret;
    + raw_spin_lock_irqsave(&byt_lock, flags);
    +
    + byt_gpio_direct_irq_check(vg, offset);
    +
    + reg = readl(val_reg);
    + reg &= ~BYT_DIR_MASK;
    + if (value)
    + reg |= BYT_LEVEL;
    + else
    + reg &= ~BYT_LEVEL;

    - byt_gpio_set(chip, offset, value);
    + writel(reg, val_reg);

    + raw_spin_unlock_irqrestore(&byt_lock, flags);
    return 0;
    }


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