OMAPDSS: APPLY: Remove DISPC writes to manager's lcd parameters in interface drivers

Replace the DISPC fuctions used to configure LCD channel related manager
parameters with dss_mgr_set_lcd_config() in APPLY. This function ensures that
the DISPC registers are written at the right time by using the shadow register
programming model.

The LCD manager configurations is stored as a private data of manager in APPLY.
It is treated as an extra info as it's the panel drivers which trigger this
apply via interface drivers, and not a DSS2 user like omapfb or omapdrm.

Storing LCD manager related properties in APPLY also prevents the need to refer
to the panel connected to the manager for information. This helps in making the
DSS driver less dependent on panel.

A helper function is added to check whether the manager is LCD or TV. The direct
DISPC register writes are removed from the interface drivers.

Signed-off-by: Archit Taneja <archit@ti.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/drivers/video/omap2/dss/apply.c b/drivers/video/omap2/dss/apply.c
index 3ce7a3ec6224..30915bdcb237 100644
--- a/drivers/video/omap2/dss/apply.c
+++ b/drivers/video/omap2/dss/apply.c
@@ -104,6 +104,7 @@ struct mgr_priv_data {
         bool shadow_extra_info_dirty;
 
         struct omap_video_timings timings;
+        struct dss_lcd_mgr_config lcd_config;
 };
 
 static struct {
@@ -137,6 +138,7 @@ static struct mgr_priv_data *get_mgr_priv(struct omap_overlay_manager *mgr)
 void dss_apply_init(void)
 {
         const int num_ovls = dss_feat_get_num_ovls();
+        struct mgr_priv_data *mp;
         int i;
 
         spin_lock_init(&data_lock);
@@ -168,6 +170,16 @@ void dss_apply_init(void)
 
                 op->user_info = op->info;
         }
+
+        /*
+         * Initialize some of the lcd_config fields for TV manager, this lets
+         * us prevent checking if the manager is LCD or TV at some places
+         */
+        mp = &dss_data.mgr_priv_data_array[OMAP_DSS_CHANNEL_DIGIT];
+
+        mp->lcd_config.video_port_width = 24;
+        mp->lcd_config.clock_info.lck_div = 1;
+        mp->lcd_config.clock_info.pck_div = 1;
 }
 
 static bool ovl_manual_update(struct omap_overlay *ovl)
@@ -633,6 +645,24 @@ static void dss_mgr_write_regs_extra(struct omap_overlay_manager *mgr)
 
         dispc_mgr_set_timings(mgr->id, &mp->timings);
 
+        /* lcd_config parameters */
+        if (dss_mgr_is_lcd(mgr->id)) {
+                dispc_mgr_set_io_pad_mode(mp->lcd_config.io_pad_mode);
+
+                dispc_mgr_enable_stallmode(mgr->id, mp->lcd_config.stallmode);
+                dispc_mgr_enable_fifohandcheck(mgr->id,
+                        mp->lcd_config.fifohandcheck);
+
+                dispc_mgr_set_clock_div(mgr->id, &mp->lcd_config.clock_info);
+
+                dispc_mgr_set_tft_data_lines(mgr->id,
+                        mp->lcd_config.video_port_width);
+
+                dispc_lcd_enable_signal_polarity(mp->lcd_config.lcden_sig_polarity);
+
+                dispc_mgr_set_lcd_type_tft(mgr->id);
+        }
+
         mp->extra_info_dirty = false;
         if (mp->updating)
                 mp->shadow_extra_info_dirty = true;
@@ -1292,6 +1322,44 @@ void dss_mgr_set_timings(struct omap_overlay_manager *mgr,
         mutex_unlock(&apply_lock);
 }
 
+static void dss_apply_mgr_lcd_config(struct omap_overlay_manager *mgr,
+                const struct dss_lcd_mgr_config *config)
+{
+        struct mgr_priv_data *mp = get_mgr_priv(mgr);
+
+        mp->lcd_config = *config;
+        mp->extra_info_dirty = true;
+}
+
+void dss_mgr_set_lcd_config(struct omap_overlay_manager *mgr,
+                const struct dss_lcd_mgr_config *config)
+{
+        unsigned long flags;
+        struct mgr_priv_data *mp = get_mgr_priv(mgr);
+
+        mutex_lock(&apply_lock);
+
+        if (mp->enabled) {
+                DSSERR("cannot apply lcd config for %s: manager needs to be disabled\n",
+                        mgr->name);
+                goto out;
+        }
+
+        spin_lock_irqsave(&data_lock, flags);
+
+        dss_apply_mgr_lcd_config(mgr, config);
+
+        dss_write_regs();
+        dss_set_go_bits();
+
+        spin_unlock_irqrestore(&data_lock, flags);
+
+        wait_pending_extra_info_updates();
+
+out:
+        mutex_unlock(&apply_lock);
+}
+
 int dss_ovl_set_info(struct omap_overlay *ovl,
                 struct omap_overlay_info *info)
 {