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drm/nouveau/kms: disallow dual-link harder if hdmi connection detected

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The fallthrough cases (pre-Fermi) would accidentally allow dual-link pixel
clocks even where they shouldn't be.  This leads to a high resolution HDMI
displays, connected via a DVI->HDMI adapter, to fail on the original NV50.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2019-05-29 09:58:18 +10:00
parent 533f475240
commit d108418478
1 changed files with 5 additions and 2 deletions
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7
drivers/gpu/drm/nouveau/nouveau_connector.c
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@ -978,11 +978,13 @@ get_tmds_link_bandwidth(struct drm_connector *connector)
struct nouveau_drm *drm = nouveau_drm(connector->dev);
struct dcb_output *dcb = nv_connector->detected_encoder->dcb;
struct drm_display_info *info = NULL;
const unsigned duallink_scale =
unsigned duallink_scale =
nouveau_duallink && nv_encoder->dcb->duallink_possible ? 2 : 1;
if (drm_detect_hdmi_monitor(nv_connector->edid))
if (drm_detect_hdmi_monitor(nv_connector->edid)) {
info = &nv_connector->base.display_info;
duallink_scale = 1;
}
if (info) {
if (nouveau_hdmimhz > 0)
@ -1003,6 +1005,7 @@ get_tmds_link_bandwidth(struct drm_connector *connector)
if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_FERMI)
return 225000;
}
if (dcb->location != DCB_LOC_ON_CHIP ||
drm->client.device.info.chipset >= 0x46)
return 165000 * duallink_scale;