On some servers there is a hardcoded EDID provided
in the vbios so that the driver will always see a
display connected even if something like a KVM
prevents traditional means like DDC or load
detection from working properly. Also most
server boards with DVI are not actually DVI, but
DVO connected to a virtual KVM service processor.
If we fail to detect a monitor via DDC or load
detection and a hardcoded EDID is available, use
it.
Additionally, when using the hardcoded EDID, use
a copy of it rather than the actual one stored
in the driver as the detect() and get_modes()
functions may free it if DDC is successful.
This fixes the virtual KVM on several internal
servers.
Signed-off-by: Alex Deucher <alexdeucher at gmail.com>
Cc: stable at kernel.org
---
drivers/gpu/drm/radeon/radeon_combios.c | 21 ++++++++++++++----
drivers/gpu/drm/radeon/radeon_connectors.c | 30 ++++++++++++++++++++++++++-
drivers/gpu/drm/radeon/radeon_mode.h | 1 +
3 files changed, 45 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_combios.c
b/drivers/gpu/drm/radeon/radeon_combios.c
index 6467b0a..8caf546 100644
--- a/drivers/gpu/drm/radeon/radeon_combios.c
+++ b/drivers/gpu/drm/radeon/radeon_combios.c
@@ -448,7 +448,7 @@ static uint16_t combios_get_table_offset(struct drm_device
*dev,
bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev)
{
- int edid_info;
+ int edid_info, size;
struct edid *edid;
unsigned char *raw;
edid_info = combios_get_table_offset(rdev->ddev,
COMBIOS_HARDCODED_EDID_TABLE);
@@ -456,11 +456,12 @@ bool radeon_combios_check_hardcoded_edid(struct
radeon_device *rdev)
return false;
raw = rdev->bios + edid_info;
- edid = kmalloc(EDID_LENGTH * (raw[0x7e] + 1), GFP_KERNEL);
+ size = EDID_LENGTH * (raw[0x7e] + 1);
+ edid = kmalloc(size, GFP_KERNEL);
if (edid == NULL)
return false;
- memcpy((unsigned char *)edid, raw, EDID_LENGTH * (raw[0x7e] + 1));
+ memcpy((unsigned char *)edid, raw, size);
if (!drm_edid_is_valid(edid)) {
kfree(edid);
@@ -468,6 +469,7 @@ bool radeon_combios_check_hardcoded_edid(struct
radeon_device *rdev)
}
rdev->mode_info.bios_hardcoded_edid = edid;
+ rdev->mode_info.bios_hardcoded_edid_size = size;
return true;
}
@@ -475,8 +477,17 @@ bool radeon_combios_check_hardcoded_edid(struct
radeon_device *rdev)
struct edid *
radeon_bios_get_hardcoded_edid(struct radeon_device *rdev)
{
- if (rdev->mode_info.bios_hardcoded_edid)
- return rdev->mode_info.bios_hardcoded_edid;
+ struct edid *edid;
+
+ if (rdev->mode_info.bios_hardcoded_edid) {
+ edid = kmalloc(rdev->mode_info.bios_hardcoded_edid_size,
GFP_KERNEL);
+ if (edid) {
+ memcpy((unsigned char *)edid,
+ (unsigned char
*)rdev->mode_info.bios_hardcoded_edid,
+ rdev->mode_info.bios_hardcoded_edid_size);
+ return edid;
+ }
+ }
return NULL;
}
diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c
b/drivers/gpu/drm/radeon/radeon_connectors.c
index 3f3c9aa..a186673 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -629,6 +629,8 @@ static int radeon_vga_mode_valid(struct drm_connector
*connector,
static enum drm_connector_status
radeon_vga_detect(struct drm_connector *connector, bool force)
{
+ struct drm_device *dev = connector->dev;
+ struct radeon_device *rdev = dev->dev_private;
struct radeon_connector *radeon_connector =
to_radeon_connector(connector);
struct drm_encoder *encoder;
struct drm_encoder_helper_funcs *encoder_funcs;
@@ -679,6 +681,17 @@ radeon_vga_detect(struct drm_connector *connector, bool
force)
if (ret == connector_status_connected)
ret = radeon_connector_analog_encoder_conflict_solve(connector,
encoder, ret, true);
+
+ /* RN50 and some RV100 asics in servers often have a hardcoded EDID in
the
+ * vbios to deal with KVMs. If we have one and are not able to detect a
monitor
+ * by other means, assume the CRT is connected and use that EDID.
+ */
+ if ((!rdev->is_atom_bios) &&
+ (ret == connector_status_disconnected) &&
+ rdev->mode_info.bios_hardcoded_edid_size) {
+ ret = connector_status_connected;
+ }
+
radeon_connector_update_scratch_regs(connector, ret);
return ret;
}
@@ -790,6 +803,8 @@ static int radeon_dvi_get_modes(struct drm_connector
*connector)
static enum drm_connector_status
radeon_dvi_detect(struct drm_connector *connector, bool force)
{
+ struct drm_device *dev = connector->dev;
+ struct radeon_device *rdev = dev->dev_private;
struct radeon_connector *radeon_connector =
to_radeon_connector(connector);
struct drm_encoder *encoder = NULL;
struct drm_encoder_helper_funcs *encoder_funcs;
@@ -829,8 +844,6 @@ radeon_dvi_detect(struct drm_connector *connector, bool
force)
* you don't really know what's connected to which port
as both are digital.
*/
if (radeon_connector->shared_ddc && (ret ==
connector_status_connected)) {
- struct drm_device *dev = connector->dev;
- struct radeon_device *rdev = dev->dev_private;
struct drm_connector *list_connector;
struct radeon_connector *list_radeon_connector;
list_for_each_entry(list_connector,
&dev->mode_config.connector_list, head) {
@@ -895,6 +908,19 @@ radeon_dvi_detect(struct drm_connector *connector, bool
force)
ret = radeon_connector_analog_encoder_conflict_solve(connector,
encoder, ret, true);
}
+ /* RN50 and some RV100 asics in servers often have a hardcoded EDID in
the
+ * vbios to deal with KVMs. If we have one and are not able to detect a
monitor
+ * by other means, assume the DFP is connected and use that EDID. In
most
+ * cases the DVI port is actually a virtual KVM port connected to the
service
+ * processor.
+ */
+ if ((!rdev->is_atom_bios) &&
+ (ret == connector_status_disconnected) &&
+ rdev->mode_info.bios_hardcoded_edid_size) {
+ radeon_connector->use_digital = true;
+ ret = connector_status_connected;
+ }
+
out:
/* updated in get modes as well since we need to know if it's analog or
digital */
radeon_connector_update_scratch_regs(connector, ret);
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h
b/drivers/gpu/drm/radeon/radeon_mode.h
index c74bab8..96285fc 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -263,6 +263,7 @@ struct radeon_mode_info {
struct drm_property *underscan_vborder_property;
/* hardcoded DFP edid from BIOS */
struct edid *bios_hardcoded_edid;
+ int bios_hardcoded_edid_size;
/* pointer to fbdev info structure */
struct radeon_fbdev *rfbdev;
--
1.7.1.1
