drm/i915: Fix up pipe vs. double wide confusion

Double wide mode is only available on pipe A, except on GDG where
pipe B is also double wide capable.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9bbb6ea34d06..4dd6561cb7c8 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4153,10 +4153,10 @@ static int intel_crtc_compute_config(struct intel_crtc *crtc,
                  * Enable pixel doubling when the dot clock
                  * is > 90% of the (display) core speed.
                  *
-                 * XXX: No double-wide on 915GM pipe B. Is that
-                 * the only reason for the pipe == PIPE_A check?
+                 * GDG double wide on either pipe,
+                 * otherwise pipe A only.
                  */
-                if (crtc->pipe == PIPE_A &&
+                if ((crtc->pipe == PIPE_A || IS_I915G(dev)) &&
                     adjusted_mode->clock > clock_limit * 9 / 10) {
                         clock_limit *= 2;
                         pipe_config->double_wide = true;