tegra: dc: Add shutdown event callback

Add shutdown event callback to dc out ops.
This helps in notifying system shutdown event to DC clients
before calling dc disable.

- Fixes regulator disable failure when device is shutting down

Bug 1552858

Change-Id: I1e945e6ff7b0cd6a37f6e001b9257061978c1d58
Signed-off-by: Vineel Kumar Reddy Kovvuri <vineelkumarr@nvidia.com>
Reviewed-on: http://git-master/r/500726
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
Tested-by: Laxman Dewangan <ldewangan@nvidia.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/video/tegra/dc/dsi.c b/drivers/video/tegra/dc/dsi.c
index 94dcf02f5..407c307e3 100644
--- a/drivers/video/tegra/dc/dsi.c
+++ b/drivers/video/tegra/dc/dsi.c
@@ -4896,10 +4896,16 @@ static void tegra_dc_dsi_postpoweroff(struct tegra_dc *dc)
 {
         struct tegra_dc_dsi_data *dsi = tegra_dc_get_outdata(dc);
 
-        if (!dsi->enabled && dsi->avdd_dsi_csi)
+        /* Do not disable regulator when device is shutting down */
+        if (!dsi->device_shutdown && !dsi->enabled && dsi->avdd_dsi_csi)
                 regulator_disable(dsi->avdd_dsi_csi);
 }
+static void tegra_dc_dsi_shutdown(struct tegra_dc *dc)
+{
+        struct tegra_dc_dsi_data *dsi = tegra_dc_get_outdata(dc);
 
+        dsi->device_shutdown = true;
+}
 static int tegra_dsi_host_resume(struct tegra_dc *dc)
 {
         int err = 0;
@@ -5145,6 +5151,7 @@ struct tegra_dc_out_ops tegra_dc_dsi_ops = {
         .postpoweroff = tegra_dc_dsi_postpoweroff,
         .hold = tegra_dc_dsi_hold_host,
         .release = tegra_dc_dsi_release_host,
+        .shutdown = tegra_dc_dsi_shutdown,
 #ifdef CONFIG_PM
         .suspend = tegra_dc_dsi_suspend,
         .resume = tegra_dc_dsi_resume,