drm/nv50-/gpio: initialise to vbios defaults during init

This is required to fix an issue on the Retina MBP where the eDP panel's
AUX channel isn't wired up to the HPD pin for the panel, causing our aux
code to bail out early.

From looking at various traces of the binary driver, it appears NVIDIA do
something very similar on at least all nv50+ chipsets during their
initialisation sequence.  So, hopefully this is safe.

Issue and fix initially tracked down by Ryan Bourgeois on fdo#51971.

Backported fix from reworked nouveau kernel module.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nv50_gpio.c b/drivers/gpu/drm/nouveau/nv50_gpio.c
index f429e6a8ca7aeba09b3f8ef852376ea8d360c4ee..f03490534893e4772a75b4b4731b69be6286f744 100644 (file)
--- a/drivers/gpu/drm/nouveau/nv50_gpio.c
+++ b/drivers/gpu/drm/nouveau/nv50_gpio.c
@@ -115,6 +115,9 @@ nv50_gpio_init(struct drm_device *dev)
 {
        struct drm_nouveau_private *dev_priv = dev->dev_private;
 
+       /* initialise gpios and routing to vbios defaults */
+       nouveau_gpio_reset(dev);
+
        /* disable, and ack any pending gpio interrupts */
        nv_wr32(dev, 0xe050, 0x00000000);
        nv_wr32(dev, 0xe054, 0xffffffff);