OMAPDSS: clean up the omapdss platform data mess

The omapdss pdata handling is a mess. This is more evident when trying
to use device tree for DSS, as we don't have platform data anymore in
that case. This patch cleans the pdata handling by:

- Remove struct omap_display_platform_data. It was used just as a
  wrapper for struct omap_dss_board_info.
- Pass the platform data only to omapdss device. The drivers for omap
  dss hwmods do not need the platform data. This should also work better
  for DT, as we can create omapdss device programmatically in generic omap
  boot code, and thus we can pass the pdata to it.
- Create dss functions for get_ctx_loss_count and dsi_enable/disable_pads
  that the dss hwmod drivers can call.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

7 files changed, 62 insertions, 60 deletions

diff --git a/arch/arm/mach-omap2/display.c b/arch/arm/mach-omap2/display.c
index 60cded4738a0..07232fd7ab17 100644
--- a/arch/arm/mach-omap2/display.c
+++ b/arch/arm/mach-omap2/display.c
@@ -191,10 +191,24 @@ int __init omap_display_init(struct omap_dss_board_info *board_data)
         struct omap_hwmod *oh;
         struct platform_device *pdev;
         int i, oh_count;
-        struct omap_display_platform_data pdata;
         const struct omap_dss_hwmod_data *curr_dss_hwmod;
 
-        memset(&pdata, 0, sizeof(pdata));
+        /* create omapdss device */
+
+        board_data->dsi_enable_pads = omap_dsi_enable_pads;
+        board_data->dsi_disable_pads = omap_dsi_disable_pads;
+        board_data->get_context_loss_count = omap_pm_get_dev_context_loss_count;
+        board_data->set_min_bus_tput = omap_dss_set_min_bus_tput;
+
+        omap_display_device.dev.platform_data = board_data;
+
+        r = platform_device_register(&omap_display_device);
+        if (r < 0) {
+                pr_err("Unable to register omapdss device\n");
+                return r;
+        }
+
+        /* create devices for dss hwmods */
 
         if (cpu_is_omap24xx()) {
                 curr_dss_hwmod = omap2_dss_hwmod_data;
@@ -207,16 +221,6 @@ int __init omap_display_init(struct omap_dss_board_info *board_data)
                 oh_count = ARRAY_SIZE(omap4_dss_hwmod_data);
         }
 
-        if (board_data->dsi_enable_pads == NULL)
-                board_data->dsi_enable_pads = omap_dsi_enable_pads;
-        if (board_data->dsi_disable_pads == NULL)
-                board_data->dsi_disable_pads = omap_dsi_disable_pads;
-
-        pdata.board_data = board_data;
-        pdata.board_data->get_context_loss_count =
-                omap_pm_get_dev_context_loss_count;
-        pdata.board_data->set_min_bus_tput = omap_dss_set_min_bus_tput;
-
         for (i = 0; i < oh_count; i++) {
                 oh = omap_hwmod_lookup(curr_dss_hwmod[i].oh_name);
                 if (!oh) {
@@ -226,21 +230,16 @@ int __init omap_display_init(struct omap_dss_board_info *board_data)
                 }
 
                 pdev = omap_device_build(curr_dss_hwmod[i].dev_name,
-                                curr_dss_hwmod[i].id, oh, &pdata,
-                                sizeof(struct omap_display_platform_data),
+                                curr_dss_hwmod[i].id, oh,
+                                NULL, 0,
                                 NULL, 0, 0);
 
                 if (WARN((IS_ERR(pdev)), "Could not build omap_device for %s\n",
                                 curr_dss_hwmod[i].oh_name))
                         return -ENODEV;
         }
-        omap_display_device.dev.platform_data = board_data;
 
-        r = platform_device_register(&omap_display_device);
-        if (r < 0)
-                printk(KERN_ERR "Unable to register OMAP-Display device\n");
-
-        return r;
+        return 0;
 }
 
 static void dispc_disable_outputs(void)
diff --git a/drivers/video/omap2/dss/core.c b/drivers/video/omap2/dss/core.c
index 64cb8aa49b26..b37b6f484c08 100644
--- a/drivers/video/omap2/dss/core.c
+++ b/drivers/video/omap2/dss/core.c
@@ -87,6 +87,41 @@ struct regulator *dss_get_vdds_sdi(void)
         return reg;
 }
 
+int dss_get_ctx_loss_count(struct device *dev)
+{
+        struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
+        int cnt;
+
+        if (!board_data->get_context_loss_count)
+                return -ENOENT;
+
+        cnt = board_data->get_context_loss_count(dev);
+
+        WARN_ONCE(cnt < 0, "get_context_loss_count failed: %d\n", cnt);
+
+        return cnt;
+}
+
+int dss_dsi_enable_pads(int dsi_id, unsigned lane_mask)
+{
+        struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
+
+        if (!board_data->dsi_enable_pads)
+                return -ENOENT;
+
+        return board_data->dsi_enable_pads(dsi_id, lane_mask);
+}
+
+void dss_dsi_disable_pads(int dsi_id, unsigned lane_mask)
+{
+        struct omap_dss_board_info *board_data = core.pdev->dev.platform_data;
+
+        if (!board_data->dsi_enable_pads)
+                return;
+
+        return board_data->dsi_disable_pads(dsi_id, lane_mask);
+}
+
 int dss_set_min_bus_tput(struct device *dev, unsigned long tput)
 {
         struct omap_dss_board_info *pdata = core.pdev->dev.platform_data;
diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c
index 727e15b29a14..2c43119b5ade 100644
--- a/drivers/video/omap2/dss/dispc.c
+++ b/drivers/video/omap2/dss/dispc.c
@@ -131,23 +131,6 @@ static inline u32 dispc_read_reg(const u16 idx)
         return __raw_readl(dispc.base + idx);
 }
 
-static int dispc_get_ctx_loss_count(void)
-{
-        struct device *dev = &dispc.pdev->dev;
-        struct omap_display_platform_data *pdata = dev->platform_data;
-        struct omap_dss_board_info *board_data = pdata->board_data;
-        int cnt;
-
-        if (!board_data->get_context_loss_count)
-                return -ENOENT;
-
-        cnt = board_data->get_context_loss_count(dev);
-
-        WARN_ONCE(cnt < 0, "get_context_loss_count failed: %d\n", cnt);
-
-        return cnt;
-}
-
 #define SR(reg) \
         dispc.ctx[DISPC_##reg / sizeof(u32)] = dispc_read_reg(DISPC_##reg)
 #define RR(reg) \
@@ -251,7 +234,7 @@ static void dispc_save_context(void)
         if (dss_has_feature(FEAT_CORE_CLK_DIV))
                 SR(DIVISOR);
 
-        dispc.ctx_loss_cnt = dispc_get_ctx_loss_count();
+        dispc.ctx_loss_cnt = dss_get_ctx_loss_count(&dispc.pdev->dev);
         dispc.ctx_valid = true;
 
         DSSDBG("context saved, ctx_loss_count %d\n", dispc.ctx_loss_cnt);
@@ -266,7 +249,7 @@ static void dispc_restore_context(void)
         if (!dispc.ctx_valid)
                 return;
 
-        ctx = dispc_get_ctx_loss_count();
+        ctx = dss_get_ctx_loss_count(&dispc.pdev->dev);
 
         if (ctx >= 0 && ctx == dispc.ctx_loss_cnt)
                 return;
diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c
index a243e65b870f..d18c8e290c85 100644
--- a/drivers/video/omap2/dss/dsi.c
+++ b/drivers/video/omap2/dss/dsi.c
@@ -261,9 +261,6 @@ struct dsi_data {
         struct clk *dss_clk;
         struct clk *sys_clk;
 
-        int (*enable_pads)(int dsi_id, unsigned lane_mask);
-        void (*disable_pads)(int dsi_id, unsigned lane_mask);
-
         struct dsi_clock_info current_cinfo;
 
         bool vdds_dsi_enabled;
@@ -2306,7 +2303,7 @@ static int dsi_cio_init(struct omap_dss_device *dssdev)