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drm/i915/vbt: split out defaults that are set when there is no VBT

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commit bb1d132935c2f87cd261eb559759fe49d5e5dc43 upstream.

The main thing are the DDI ports. If there's a VBT that says there are
no outputs, we should trust that, and not have semi-random
defaults. Unfortunately, the defaults have resulted in some Chromebooks
without VBT to rely on this behaviour, so we split out the defaults for
the missing VBT case.

Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/95c26079ff640d43f53b944f17e9fc356b36daec.1489152288.git.jani.nikula@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jani Nikula 2017-03-10 15:27:58 +02:00 committed by Greg Kroah-Hartman
parent 555c443a1a
commit 09fcb3561d
1 changed files with 16 additions and 1 deletions
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17
drivers/gpu/drm/i915/intel_bios.c
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@ -1332,6 +1332,7 @@ parse_device_mapping(struct drm_i915_private *dev_priv,
return;
}
/* Common defaults which may be overridden by VBT. */
static void
init_vbt_defaults(struct drm_i915_private *dev_priv)
{
@ -1368,6 +1369,18 @@ init_vbt_defaults(struct drm_i915_private *dev_priv)
&dev_priv->vbt.ddi_port_info[port];
info->hdmi_level_shift = HDMI_LEVEL_SHIFT_UNKNOWN;
}
}
/* Defaults to initialize only if there is no VBT. */
static void
init_vbt_missing_defaults(struct drm_i915_private *dev_priv)
{
enum port port;
for (port = PORT_A; port < I915_MAX_PORTS; port++) {
struct ddi_vbt_port_info *info =
&dev_priv->vbt.ddi_port_info[port];
info->supports_dvi = (port != PORT_A && port != PORT_E);
info->supports_hdmi = info->supports_dvi;
@ -1504,8 +1517,10 @@ void intel_bios_init(struct drm_i915_private *dev_priv)
parse_ddi_ports(dev_priv, bdb);
out:
if (!vbt)
if (!vbt) {
DRM_INFO("Failed to find VBIOS tables (VBT)\n");
init_vbt_missing_defaults(dev_priv);
}
if (bios)
pci_unmap_rom(pdev, bios);