OMAP: DSS2: Delay regulator_get() calls

DSS submodules DPI/SDI/DSI/VENC require a regulator to function.
However, if the board doesn't use, say, SDI, the board shouldn't need to
configure vdds_sdi regulator required by the SDI module.

Currently the regulators are acquired when the DSS driver is loaded.
This means that if the kernel is configured with SDI, vdds_sdi regulator
is needed for all boards.

This patch changes the DSS driver to acquire the regulators only when a
display of particular type is initialized. For example, vdds_sdi is
acquired when sdi_init_display() is called.

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

1 files changed, 13 insertions, 5 deletions

diff --git a/drivers/video/omap2/dss/sdi.c b/drivers/video/omap2/dss/sdi.c
index 8272fc1f3279..9f10a0d9e760 100644
--- a/drivers/video/omap2/dss/sdi.c
+++ b/drivers/video/omap2/dss/sdi.c
@@ -157,6 +157,19 @@ int sdi_init_display(struct omap_dss_device *dssdev)
 {
         DSSDBG("SDI init\n");
 
+        if (sdi.vdds_sdi_reg == NULL) {
+                struct regulator *vdds_sdi;
+
+                vdds_sdi = dss_get_vdds_sdi();
+
+                if (IS_ERR(vdds_sdi)) {
+                        DSSERR("can't get VDDS_SDI regulator\n");
+                        return PTR_ERR(vdds_sdi);
+                }
+
+                sdi.vdds_sdi_reg = vdds_sdi;
+        }
+
         return 0;
 }
 
@@ -165,11 +178,6 @@ int sdi_init(bool skip_init)
         /* we store this for first display enable, then clear it */
         sdi.skip_init = skip_init;
 
-        sdi.vdds_sdi_reg = dss_get_vdds_sdi();
-        if (IS_ERR(sdi.vdds_sdi_reg)) {
-                DSSERR("can't get VDDS_SDI regulator\n");
-                return PTR_ERR(sdi.vdds_sdi_reg);
-        }
         /*
          * Enable clocks already here, otherwise there would be a toggle
          * of them until sdi_display_enable is called.