1 files changed, 47 insertions, 24 deletions

diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c
index 57ce428deb0..4f3de3580f5 100644
--- a/drivers/video/omap2/dss/dss.c
+++ b/drivers/video/omap2/dss/dss.c
@@ -60,7 +60,7 @@ struct dss_reg {
 static struct {
         struct platform_device *pdev;
         void __iomem    *base;
-        int             ctx_id;
+        int             ctx_loss_cnt;
 
         struct clk      *dpll4_m4_ck;
         struct clk      *dss_ick;
@@ -665,34 +665,58 @@ void dss_select_hdmi_venc_clk_source(enum dss_hdmi_venc_clk_source_select hdmi)
 }
 
 /* CONTEXT */
-static int dss_get_ctx_id(void)
+static void dss_init_ctx_loss_count(void)
 {
-        struct omap_display_platform_data *pdata = dss.pdev->dev.platform_data;
-        int r;
+        struct device *dev = &dss.pdev->dev;
+        struct omap_display_platform_data *pdata = dev->platform_data;
+        struct omap_dss_board_info *board_data = pdata->board_data;
+        int cnt = 0;
 
-        if (!pdata->board_data->get_last_off_on_transaction_id)
-                return 0;
-        r = pdata->board_data->get_last_off_on_transaction_id(&dss.pdev->dev);
-        if (r < 0) {
-                dev_err(&dss.pdev->dev, "getting transaction ID failed, "
-                                "will force context restore\n");
-                r = -1;
-        }
-        return r;
+        /*
+         * get_context_loss_count returns negative on error. We'll ignore the
+         * error and store the error to ctx_loss_cnt, which will cause
+         * dss_need_ctx_restore() call to return true.
+         */
+
+        if (board_data->get_context_loss_count)
+                cnt = board_data->get_context_loss_count(dev);
+
+        WARN_ON(cnt < 0);
+
+        dss.ctx_loss_cnt = cnt;
+
+        DSSDBG("initial ctx_loss_cnt %u\n", cnt);
 }
 
-int dss_need_ctx_restore(void)
+static bool dss_need_ctx_restore(void)
 {
-        int id = dss_get_ctx_id();
+        struct device *dev = &dss.pdev->dev;
+        struct omap_display_platform_data *pdata = dev->platform_data;
+        struct omap_dss_board_info *board_data = pdata->board_data;
+        int cnt;
 
-        if (id < 0 || id != dss.ctx_id) {
-                DSSDBG("ctx id %d -> id %d\n",
-                                dss.ctx_id, id);
-                dss.ctx_id = id;
-                return 1;
-        } else {
-                return 0;
+        /*
+         * If get_context_loss_count is not available, assume that we need
+         * context restore always.
+         */
+        if (!board_data->get_context_loss_count)
+                return true;
+
+        cnt = board_data->get_context_loss_count(dev);
+        if (cnt < 0) {
+                dev_err(dev, "getting context loss count failed, will force "
+                                "context restore\n");
+                dss.ctx_loss_cnt = cnt;
+                return true;
         }
+
+        if (cnt == dss.ctx_loss_cnt)
+                return false;
+
+        DSSDBG("ctx_loss_cnt %d -> %d\n", dss.ctx_loss_cnt, cnt);
+        dss.ctx_loss_cnt = cnt;
+
+        return true;
 }
 
 static void save_all_ctx(void)
@@ -1046,8 +1070,7 @@ static int omap_dsshw_probe(struct platform_device *pdev)
 
         dss_clk_enable_all_no_ctx();
 
-        dss.ctx_id = dss_get_ctx_id();
-        DSSDBG("initial ctx id %u\n", dss.ctx_id);
+        dss_init_ctx_loss_count();
 
         /* disable LCD and DIGIT output. This seems to fix the synclost
          * problem that we get, if the bootloader starts the DSS and