The pre-retina MacBook Pro uses an LVDS panel and a gmux controller
to switch the panel between its two GPUs. The panel mode in VBIOS
is notoriously bogus on these machines.
Use drm_get_edid_switcheroo() in lieu of drm_get_edid() on LVDS.
This allows us to retrieve the EDID if the outputs are currently
muxed to the other GPU by temporarily switching the panel's DDC
lines. Likewise, ask vga_switcheroo to switch DDC before probing
LVDS connectors.
This only enables EDID probing on the pre-retina MBP (2008 - 2013).
The retina MBP (2012 - present) uses eDP and gmux is not capable
of switching AUX separately from the main link on these models.
This will be addressed in later patches.
List of pre-retina MBPs with dual GPUs, either or both Nvidia:
[MBP 5,1 2008 nvidia MCP79 + G96 pre-retina 15"]
[MBP 5,2 2009 nvidia MCP79 + G96 pre-retina 17"]
[MBP 5,3 2009 nvidia MCP79 + G96 pre-retina 15"]
[MBP 6,2 2010 intel ILK + nvidia GT216 pre-retina 15"]
[MBP 6,1 2010 intel ILK + nvidia GT216 pre-retina 17"]
[MBP 9,1 2012 intel IVB + nvidia GK107 pre-retina 15"]
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=88861
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61115
Tested-by: Lukas Wunner <lu...@wunner.de>
[MBP 9,1 2012 intel IVB + nvidia GK107 pre-retina 15"]
Signed-off-by: Lukas Wunner <lu...@wunner.de>
---
drivers/gpu/drm/nouveau/nouveau_connector.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c
b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 2e7cbe9..fb12c9e 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -27,6 +27,7 @@
#include <acpi/button.h>
#include <linux/pm_runtime.h>
+#include <linux/vga_switcheroo.h>
#include <drm/drmP.h>
#include <drm/drm_edid.h>
@@ -148,7 +149,13 @@ nouveau_connector_ddc_detect(struct drm_connector
*connector)
break;
} else
if (nv_encoder->i2c) {
- if (nvkm_probe_i2c(nv_encoder->i2c, 0x50))
+ int ret;
+ if (nv_encoder->dcb->type == DCB_OUTPUT_LVDS)
+ vga_switcheroo_lock_ddc(dev->pdev);
+ ret = nvkm_probe_i2c(nv_encoder->i2c, 0x50);
+ if (nv_encoder->dcb->type == DCB_OUTPUT_LVDS)
+ vga_switcheroo_unlock_ddc();
+ if (ret)
break;
}
}
@@ -259,7 +266,9 @@ nouveau_connector_detect(struct drm_connector *connector,
bool force)
nv_encoder = nouveau_connector_ddc_detect(connector);
if (nv_encoder && (i2c = nv_encoder->i2c) != NULL) {
- nv_connector->edid = drm_get_edid(connector, i2c);
+ nv_connector->edid = nv_encoder->dcb->type == DCB_OUTPUT_LVDS ?
+ drm_get_edid_switcheroo(connector, i2c) :
+ drm_get_edid(connector, i2c);
drm_mode_connector_update_edid_property(connector,
nv_connector->edid);
if (!nv_connector->edid) {
--
1.8.5.2 (Apple Git-48)
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