On Mon, May 24, 2021 at 03:18:52PM +0200, Maxime Ripard wrote:
> The new gpiod interface takes care of parsing the GPIO flags and to
> return the logical value when accessing an active-low GPIO, so switching
> to it simplifies a lot the driver.
>
> Signed-off-by: Maxime Ripard <max...@cerno.tech>
> ---
> drivers/gpu/drm/vc4/vc4_hdmi.c | 24 +++++++-----------------
> drivers/gpu/drm/vc4/vc4_hdmi.h | 3 +--
> 2 files changed, 8 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index ccc6c8079dc6..34622c59f6a7 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -159,10 +159,9 @@ vc4_hdmi_connector_detect(struct drm_connector
> *connector, bool force)
> struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
> bool connected = false;
>
> - if (vc4_hdmi->hpd_gpio) {
> - if (gpio_get_value_cansleep(vc4_hdmi->hpd_gpio) ^
> - vc4_hdmi->hpd_active_low)
> - connected = true;
> + if (vc4_hdmi->hpd_gpio &&
> + gpiod_get_value_cansleep(vc4_hdmi->hpd_gpio)) {
> + connected = true;
> } else if (drm_probe_ddc(vc4_hdmi->ddc)) {
> connected = true;
> } else if (HDMI_READ(HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED) {
> @@ -1993,7 +1992,6 @@ static int vc4_hdmi_bind(struct device *dev, struct
> device *master, void *data)
> struct vc4_hdmi *vc4_hdmi;
> struct drm_encoder *encoder;
> struct device_node *ddc_node;
> - u32 value;
> int ret;
>
> vc4_hdmi = devm_kzalloc(dev, sizeof(*vc4_hdmi), GFP_KERNEL);
> @@ -2031,18 +2029,10 @@ static int vc4_hdmi_bind(struct device *dev, struct
> device *master, void *data)
> /* Only use the GPIO HPD pin if present in the DT, otherwise
> * we'll use the HDMI core's register.
> */
> - if (of_find_property(dev->of_node, "hpd-gpios", &value)) {
> - enum of_gpio_flags hpd_gpio_flags;
> -
> - vc4_hdmi->hpd_gpio = of_get_named_gpio_flags(dev->of_node,
> - "hpd-gpios", 0,
> - &hpd_gpio_flags);
> - if (vc4_hdmi->hpd_gpio < 0) {
> - ret = vc4_hdmi->hpd_gpio;
> - goto err_put_ddc;
> - }
> -
> - vc4_hdmi->hpd_active_low = hpd_gpio_flags & OF_GPIO_ACTIVE_LOW;
> + vc4_hdmi->hpd_gpio = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN);
> + if (IS_ERR(vc4_hdmi->hpd_gpio)) {
> + ret = PTR_ERR(vc4_hdmi->hpd_gpio);
> + goto err_put_ddc;
> }
>
> vc4_hdmi->disable_wifi_frequencies =
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h
> index 060bcaefbeb5..2688a55461d6 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.h
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h
> @@ -146,8 +146,7 @@ struct vc4_hdmi {
> /* VC5 Only */
> void __iomem *rm_regs;
>
> - int hpd_gpio;
> - bool hpd_active_low;
> + struct gpio_desc *hpd_gpio;
>
> /*
> * On some systems (like the RPi4), some modes are in the same
> --
> 2.31.1
Hi Maxime,
This patch as commit 6800234ceee0 ("drm/vc4: hdmi: Convert to gpiod")
causes my Raspberry Pi 3 to lock up shortly after boot in combination
with commit 411efa18e4b0 ("drm/vc4: hdmi: Move the HSM clock enable to
runtime_pm"). The serial console and ssh are completely unresponsive and
I do not see any messages in dmesg with "debug ignore_loglevel". The
device is running with a 32-bit kernel (multi_v7_defconfig) with 32-bit
userspace. If there is any further information that I can provide,
please let me know.
Cheers,
Nathan
