drm/bridge: tpd12s015: Fix irq registering in tpd12s015_probe

stable inclusion
from stable-5.10.4
commit 6ed6e024e3bb58332af0840b2658bc4252978ea4
bugzilla: 46903

--------------------------------

[ Upstream commit c2530cc9 ]

gpiod_to_irq() return negative value in case of error,
the existing code doesn't handle negative error codes.
If the HPD gpio supports IRQs (gpiod_to_irq returns a
valid number), we use the IRQ. If it doesn't (gpiod_to_irq
returns an error), it gets polled via detect().

Fixes: cff5e6f7 ("drm/bridge: Add driver for the TI TPD12S015 HDMI level shifter")
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Reviewed-by: NLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20201102143024.26216-1-yuehaibing@huawei.comSigned-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NXie XiuQi <xiexiuqi@huawei.com>

drivers/gpu/drm/bridge/ti-tpd12s015.c

@@ -160,7 +160,7 @@ static int tpd12s015_probe(struct platform_device *pdev)
 
 	/* Register the IRQ if the HPD GPIO is IRQ-capable. */
 	tpd->hpd_irq = gpiod_to_irq(tpd->hpd_gpio);
-	if (tpd->hpd_irq) {
+	if (tpd->hpd_irq >= 0) {
 		ret = devm_request_threaded_irq(&pdev->dev, tpd->hpd_irq, NULL,
 						tpd12s015_hpd_isr,
 						IRQF_TRIGGER_RISING |