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drm/radeon/kms: add cvt mode if we only have lvds w/h and no edid (v4)

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This fixes LVDS on some mac laptops without a panel edid.

v2 - Set proper mode type flags
v3 - Note that this is not neceesarily the exact panel mode,
but an approximation based on the cvt formula.  For these
systems we should ideally read the mode info out of the
registers or add a mode table, but this works and is much
simpler.
v4 - Update comments and debug message.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher 2009-12-22 10:06:49 -05:00 committed by Dave Airlie
parent 512889f450
commit d2efdf6d6f
1 changed files with 12 additions and 0 deletions
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12
drivers/gpu/drm/radeon/radeon_connectors.c
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@ -208,6 +208,18 @@ static struct drm_display_mode *radeon_fp_native_mode(struct drm_encoder *encode
drm_mode_set_name(mode);
DRM_DEBUG("Adding native panel mode %s\n", mode->name);
} else if (native_mode->hdisplay != 0 &&
native_mode->vdisplay != 0) {
/* mac laptops without an edid */
/* Note that this is not necessarily the exact panel mode,
* but an approximation based on the cvt formula. For these
* systems we should ideally read the mode info out of the
* registers or add a mode table, but this works and is much
* simpler.
*/
mode = drm_cvt_mode(dev, native_mode->hdisplay, native_mode->vdisplay, 60, true, false, false);
mode->type = DRM_MODE_TYPE_PREFERRED | DRM_MODE_TYPE_DRIVER;
DRM_DEBUG("Adding cvt approximation of native panel mode %s\n", mode->name);
}
return mode;
}