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path: root/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
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Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c')
-rw-r--r--drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c37
1 files changed, 34 insertions, 3 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
index 7c5bed29ffef..bb34ee77458e 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/dp.c
@@ -28,6 +28,7 @@
#include <subdev/bios.h>
#include <subdev/bios/init.h>
+#include <subdev/gpio.h>
#include <subdev/i2c.h>
#include <nvif/event.h>
@@ -491,7 +492,7 @@ done:
return ret;
}
-static void
+static bool
nvkm_dp_enable(struct nvkm_dp *dp, bool enable)
{
struct nvkm_i2c_aux *aux = dp->aux;
@@ -505,7 +506,7 @@ nvkm_dp_enable(struct nvkm_dp *dp, bool enable)
if (!nvkm_rdaux(aux, DPCD_RC00_DPCD_REV, dp->dpcd,
sizeof(dp->dpcd)))
- return;
+ return true;
}
if (dp->present) {
@@ -515,6 +516,7 @@ nvkm_dp_enable(struct nvkm_dp *dp, bool enable)
}
atomic_set(&dp->lt.done, 0);
+ return false;
}
static int
@@ -555,9 +557,38 @@ nvkm_dp_fini(struct nvkm_outp *outp)
static void
nvkm_dp_init(struct nvkm_outp *outp)
{
+ struct nvkm_gpio *gpio = outp->disp->engine.subdev.device->gpio;
struct nvkm_dp *dp = nvkm_dp(outp);
+
nvkm_notify_put(&dp->outp.conn->hpd);
- nvkm_dp_enable(dp, true);
+
+ /* eDP panels need powering on by us (if the VBIOS doesn't default it
+ * to on) before doing any AUX channel transactions. LVDS panel power
+ * is handled by the SOR itself, and not required for LVDS DDC.
+ */
+ if (dp->outp.conn->info.type == DCB_CONNECTOR_eDP) {
+ int power = nvkm_gpio_get(gpio, 0, DCB_GPIO_PANEL_POWER, 0xff);
+ if (power == 0)
+ nvkm_gpio_set(gpio, 0, DCB_GPIO_PANEL_POWER, 0xff, 1);
+
+ /* We delay here unconditionally, even if already powered,
+ * because some laptop panels having a significant resume
+ * delay before the panel begins responding.
+ *
+ * This is likely a bit of a hack, but no better idea for
+ * handling this at the moment.
+ */
+ msleep(300);
+
+ /* If the eDP panel can't be detected, we need to restore
+ * the panel power GPIO to avoid breaking another output.
+ */
+ if (!nvkm_dp_enable(dp, true) && power == 0)
+ nvkm_gpio_set(gpio, 0, DCB_GPIO_PANEL_POWER, 0xff, 0);
+ } else {
+ nvkm_dp_enable(dp, true);
+ }
+
nvkm_notify_get(&dp->hpd);
}