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

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>

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index 8da06e17ff27097fbc41da986e55fb0e2e13f054..20161567dbff63ddba53379903c0c5a91d6ceb4e 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -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;
 }