video: tegra: dsi: Fix dsi suspend sequence

- explicitly disable backlight before suspend
- power gate pad after panel power gate

Bug 1341152

Change-Id: Ibf664efc3db371d09ac6f380706528b139eafce5
Signed-off-by: Animesh Kishore <ankishore@nvidia.com>
Reviewed-on: http://git-master/r/256835
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Jon Mayo <jmayo@nvidia.com>
GVS: Gerrit_Virtual_Submit
Tested-by: Vineel Kumar Reddy Kovvuri <vineelkumarr@nvidia.com>
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>

1 files changed, 20 insertions, 2 deletions

diff --git a/drivers/video/tegra/dc/dsi.c b/drivers/video/tegra/dc/dsi.c
index a27e69634..7d02d398c 100644
--- a/drivers/video/tegra/dc/dsi.c
+++ b/drivers/video/tegra/dc/dsi.c
@@ -4420,6 +4420,15 @@ fail:
         return err;
 }
 
+static void tegra_dsi_bl_off(struct backlight_device *bd)
+{
+        if (!bd)
+                return;
+
+        bd->props.brightness = 0;
+        backlight_update_status(bd);
+}
+
 static int tegra_dsi_deep_sleep(struct tegra_dc *dc,
                                 struct tegra_dc_dsi_data *dsi)
 {
@@ -4429,6 +4438,8 @@ static int tegra_dsi_deep_sleep(struct tegra_dc *dc,
         if (!dsi->enabled)
                 return 0;
 
+        tegra_dsi_bl_off(get_backlight_device_by_name(dsi->info.bl_name));
+
         err = tegra_dsi_set_to_lp_mode(dc, dsi, DSI_LP_OP_WRITE);
         if (err < 0) {
                 dev_err(&dc->ndev->dev,
@@ -4475,8 +4486,6 @@ static int tegra_dsi_deep_sleep(struct tegra_dc *dc,
         /* Disable dsi source clock */
         tegra_dsi_clk_disable(dsi);
 
-        regulator_disable(dsi->avdd_dsi_csi);
-
         dsi->enabled = false;
         dsi->host_suspended = true;
 
@@ -4485,6 +4494,14 @@ fail:
         return err;
 }
 
+static void tegra_dc_dsi_postpoweroff(struct tegra_dc *dc)
+{
+        struct tegra_dc_dsi_data *dsi = tegra_dc_get_outdata(dc);
+
+        if (!dsi->enabled)
+                regulator_disable(dsi->avdd_dsi_csi);
+}
+
 static int tegra_dsi_host_resume(struct tegra_dc *dc)
 {
         int err = 0;
@@ -4721,6 +4738,7 @@ struct tegra_dc_out_ops tegra_dc_dsi_ops = {
         .destroy = tegra_dc_dsi_destroy,
         .enable = tegra_dc_dsi_enable,
         .disable = tegra_dc_dsi_disable,
+        .postpoweroff = tegra_dc_dsi_postpoweroff,
         .hold = tegra_dc_dsi_hold_host,
         .release = tegra_dc_dsi_release_host,
 #ifdef CONFIG_PM