drm/nouveau/disp: check that panel power gpio is enabled at init time

Reported-by: Yuriy Khomchik <homyur@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.h b/drivers/gpu/drm/nouveau/nouveau_bios.h
index 1e382ad..a37c31e 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_bios.h
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.h
@@ -54,9 +54,10 @@ struct bit_entry {
 int bit_table(struct drm_device *, u8 id, struct bit_entry *);
 
 enum dcb_gpio_tag {
-       DCB_GPIO_TVDAC0 = 0xc,
+       DCB_GPIO_PANEL_POWER = 0x01,
+       DCB_GPIO_TVDAC0 = 0x0c,
        DCB_GPIO_TVDAC1 = 0x2d,
-       DCB_GPIO_PWM_FAN = 0x9,
+       DCB_GPIO_PWM_FAN = 0x09,
        DCB_GPIO_FAN_SENSE = 0x3d,
        DCB_GPIO_UNUSED = 0xff
 };

diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 3cb52bc..795a9e3 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -219,6 +219,16 @@ nouveau_display_init(struct drm_device *dev)
        if (ret)
                return ret;
 
+       /* power on internal panel if it's not already.  the init tables of
+        * some vbios default this to off for some reason, causing the
+        * panel to not work after resume
+        */
+       if (nouveau_gpio_func_get(dev, DCB_GPIO_PANEL_POWER) == 0) {
+               nouveau_gpio_func_set(dev, DCB_GPIO_PANEL_POWER, true);
+               msleep(300);
+       }
+
+       /* enable polling for external displays */
        drm_kms_helper_poll_enable(dev);
 
        /* enable hotplug interrupts */