video: tegra: dc: disable windows on dc disable

When disabling a display, also disable its windows. This forces
applications to resend windows on hotplug and resume or they will see a
blank screen.

Bug 871107

Reviewed-on: http://git-master/r/50204
(cherry picked from commit 969fe6f1a6b5e28cf6de75937fd100c73e6a99b4)

Change-Id: I7c1fc3f45fab3d839794b7955409af8ca04bef2d
Reviewed-on: http://git-master/r/56504
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>

Rebase-Id: Rcea75fc63222079f7db4cae95b4952aaee9a2d0d

1 files changed, 9 insertions, 6 deletions

diff --git a/drivers/video/tegra/dc/dc.c b/drivers/video/tegra/dc/dc.c
index e2daa826e..41413d613 100644
--- a/drivers/video/tegra/dc/dc.c
+++ b/drivers/video/tegra/dc/dc.c
@@ -2349,17 +2349,20 @@ static void _tegra_dc_controller_disable(struct tegra_dc *dc)
         clk_disable(dc->clk);
         tegra_dvfs_set_rate(dc->clk, 0);
 
-        for (i = 0; i < DC_N_WINDOWS; i++) {
+        if (dc->out && dc->out->disable)
+                dc->out->disable();
+
+        for (i = 0; i < dc->n_windows; i++) {
                 struct tegra_dc_win *w = &dc->windows[i];
+
+                /* reset window bandwidth */
                 w->bandwidth = 0;
                 w->new_bandwidth = 0;
-        }
 
-        if (dc->out && dc->out->disable)
-                dc->out->disable();
+                /* disable windows */
+                w->flags &= ~TEGRA_WIN_FLAG_ENABLED;
 
-        /* flush any pending syncpt waits */
-        for (i = 0; i < dc->n_windows; i++) {
+                /* flush any pending syncpt waits */
                 while (dc->syncpt[i].min < dc->syncpt[i].max) {
                         dc->syncpt[i].min++;
                         nvhost_syncpt_cpu_incr(&dc->ndev->host->syncpt,