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drm/gma500/psb: Actually use VBT mode when it is found 

With LVDS we were incorrectly picking the pre-programmed mode instead of
the prefered mode provided by VBT. Make sure we pick the VBT mode if
one is provided. It is likely that the mode read-out code is still wrong
but this patch fixes the immediate problem on most machines.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=78562
Cc: <stable@vger.kernel.org>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170418114332.12183-1-patrik.r.jakobsson@gmail.com
This commit is contained in:
Patrik Jakobsson 2017-04-18 13:43:32 +02:00
parent f928543404
commit 82bc9a42cf
1 changed files with 11 additions and 7 deletions
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18
drivers/gpu/drm/gma500/psb_intel_lvds.c
View File

@ -759,20 +759,23 @@ void psb_intel_lvds_init(struct drm_device *dev,
if (scan->type & DRM_MODE_TYPE_PREFERRED) {
mode_dev->panel_fixed_mode =
drm_mode_duplicate(dev, scan);
DRM_DEBUG_KMS("Using mode from DDC\n");
goto out; /* FIXME: check for quirks */
}
}
/* Failed to get EDID, what about VBT? do we need this? */
if (mode_dev->vbt_mode)
if (dev_priv->lfp_lvds_vbt_mode) {
mode_dev->panel_fixed_mode =
drm_mode_duplicate(dev, mode_dev->vbt_mode);
drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
if (!mode_dev->panel_fixed_mode)
if (dev_priv->lfp_lvds_vbt_mode)
mode_dev->panel_fixed_mode =
drm_mode_duplicate(dev,
dev_priv->lfp_lvds_vbt_mode);
if (mode_dev->panel_fixed_mode) {
mode_dev->panel_fixed_mode->type |=
DRM_MODE_TYPE_PREFERRED;
DRM_DEBUG_KMS("Using mode from VBT\n");
goto out;
}
}
/*
* If we didn't get EDID, try checking if the panel is already turned
@ -789,6 +792,7 @@ void psb_intel_lvds_init(struct drm_device *dev,
if (mode_dev->panel_fixed_mode) {
mode_dev->panel_fixed_mode->type |=
DRM_MODE_TYPE_PREFERRED;
DRM_DEBUG_KMS("Using pre-programmed mode\n");
goto out; /* FIXME: check for quirks */
}
}