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drm/nouveau: determine a value for display_info.bpc if edid doesn't

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Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2011-10-17 10:24:49 +10:00
parent 9976f15c27
commit 6322175530
1 changed files with 46 additions and 0 deletions
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46
drivers/gpu/drm/nouveau/nouveau_connector.c
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@ -644,6 +644,46 @@ nouveau_connector_scaler_modes_add(struct drm_connector *connector)
return modes;
}
static void
nouveau_connector_detect_depth(struct drm_connector *connector)
{
struct drm_nouveau_private *dev_priv = connector->dev->dev_private;
struct nouveau_connector *nv_connector = nouveau_connector(connector);
struct nouveau_encoder *nv_encoder = nv_connector->detected_encoder;
struct nvbios *bios = &dev_priv->vbios;
struct drm_display_mode *mode = nv_connector->native_mode;
bool duallink;
/* if the edid is feeling nice enough to provide this info, use it */
if (nv_connector->edid && connector->display_info.bpc)
return;
/* if not, we're out of options unless we're LVDS, default to 6bpc */
connector->display_info.bpc = 6;
if (nv_encoder->dcb->type != OUTPUT_LVDS)
return;
/* LVDS: panel straps */
if (bios->fp_no_ddc) {
if (bios->fp.if_is_24bit)
connector->display_info.bpc = 8;
return;
}
/* LVDS: DDC panel, need to first determine the number of links to
* know which if_is_24bit flag to check...
*/
if (nv_connector->edid &&
nv_connector->dcb->type == DCB_CONNECTOR_LVDS_SPWG)
duallink = ((u8 *)nv_connector->edid)[121] == 2;
else
duallink = mode->clock >= bios->fp.duallink_transition_clk;
if ((!duallink && (bios->fp.strapless_is_24bit & 1)) ||
( duallink && (bios->fp.strapless_is_24bit & 2)))
connector->display_info.bpc = 8;
}
static int
nouveau_connector_get_modes(struct drm_connector *connector)
{
@ -688,6 +728,12 @@ nouveau_connector_get_modes(struct drm_connector *connector)
ret = 1;
}
/* Attempt to determine display colour depth, this has to happen after
* we've determined the "native" mode for LVDS, as the VBIOS tables
* require us to compare against a pixel clock in some cases..
*/
nouveau_connector_detect_depth(connector);
if (nv_encoder->dcb->type == OUTPUT_TV)
ret = get_slave_funcs(encoder)->get_modes(encoder, connector);