linux-kernel - [PATCH v1] drm/tegra: Fix gpiod_get_from_of

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Date:   Fri,  5 Jul 2019 18:11:39 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1] drm/tegra: Fix gpiod_get_from_of_node() regression

That function now returns ERR_PTR instead of NULL if "hpd-gpio" is not
present in device-tree. The offending patch missed to adapt the Tegra's
DRM driver for the API change.

Fixes: 025bf37725f1 ("gpio: Fix return value mismatch of function gpiod_get_from_of_node()")
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
 drivers/gpu/drm/tegra/output.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tegra/output.c b/drivers/gpu/drm/tegra/output.c
index 274cb955e2e1..471d33809cd4 100644
--- a/drivers/gpu/drm/tegra/output.c
+++ b/drivers/gpu/drm/tegra/output.c
@@ -126,8 +126,12 @@ int tegra_output_probe(struct tegra_output *output)
 						       "nvidia,hpd-gpio", 0,
 						       GPIOD_IN,
 						       "HDMI hotplug detect");
-	if (IS_ERR(output->hpd_gpio))
-		return PTR_ERR(output->hpd_gpio);
+	if (IS_ERR(output->hpd_gpio)) {
+		if (PTR_ERR(output->hpd_gpio) == -ENOENT)
+			output->hpd_gpio = NULL;
+		else
+			return PTR_ERR(output->hpd_gpio);
+	}
 
 	if (output->hpd_gpio) {
 		err = gpiod_to_irq(output->hpd_gpio);
-- 
2.22.0