From fafcf94e2b5732d1e13b440291c53115d2b172e9 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Wed, 23 Mar 2011 08:10:10 +0000 Subject: [PATCH] drm/radeon/kms: fix hardcoded EDID handling 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 Cc: stable@kernel.org Signed-off-by: Dave Airlie --- 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 cf7c8d5b4ec2..cf602e2d0718 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 3f3c9aac46cc..a1866738a657 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 5067d18d0009..1ae6846de827 100644 --- a/drivers/gpu/drm/radeon/radeon_mode.h +++ b/drivers/gpu/drm/radeon/radeon_mode.h @@ -239,6 +239,7 @@ 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; -- 2.34.1