Messages in this thread Patch in this message | | | From | Stefan Agner <> | Subject | [PATCH] drm/tegra: return with probe defer if GPIO subsystem is not ready | Date | Thu, 26 Jul 2018 15:36:06 +0200 |
| |
If the GPIO subsystem is not ready make sure to return -EPROBE_DEFER instead of silently continuing without HPD.
Reported-by: Marcel Ziswiler <marcel.ziswiler@toradex.com> Signed-off-by: Stefan Agner <stefan@agner.ch> --- drivers/gpu/drm/tegra/output.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/tegra/output.c b/drivers/gpu/drm/tegra/output.c index ffe34bd0bb9d..4bcefe455afd 100644 --- a/drivers/gpu/drm/tegra/output.c +++ b/drivers/gpu/drm/tegra/output.c @@ -133,7 +133,9 @@ int tegra_output_probe(struct tegra_output *output) output->hpd_gpio = of_get_named_gpio_flags(output->of_node, "nvidia,hpd-gpio", 0, &output->hpd_gpio_flags); - if (gpio_is_valid(output->hpd_gpio)) { + if (output->hpd_gpio == -EPROBE_DEFER) { + return -EPROBE_DEFER; + } else if (gpio_is_valid(output->hpd_gpio)) { unsigned long flags; err = gpio_request_one(output->hpd_gpio, GPIOF_DIR_IN, -- 2.18.0
| |