drm/i915: Extend DSL readout fix to BDW and SKL.

Those platforms have the same bug as haswell, and the same fix applies
to them.

The original HSW fix that this extends is

commit 41b578fb0e8b930f2470d3f673b0fa279e77a7b8
Author: Jesse Barnes <jbarnes@virtuousgeek.org>
Date:   Tue Sep 22 12:15:54 2015 -0700

    drm/i915: workaround bad DSL readout v3

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: stable@vger.kernel.org # v4.3
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91579
Link: http://patchwork.freedesktop.org/patch/msgid/1446535913-31970-3-git-send-email-maarten.lankhorst@linux.intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 5d8ec7a818314afc5b55b7efdd99266ca243cc10..684a0d9909e71650d41463b54a702423c2ac02cb 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -749,7 +749,7 @@ static int __intel_get_crtc_scanline(struct intel_crtc *crtc)
         * problem.  We may need to extend this to include other platforms,
         * but so far testing only shows the problem on HSW.
         */
-       if (IS_HASWELL(dev) && !position) {
+       if (HAS_DDI(dev) && !position) {
                int i, temp;
 
                for (i = 0; i < 100; i++) {