OMAPDSS: Add support for DPI source selection

We can select the video source for DPI output as follows:

OMAP2/3: always LCD1
OMAP4: LCD2 or DIGIT
OMAP5: LCD1/LCD2/LCD3/DIGIT

This patch adds support to select the source, and makes dpi.c call the
function to set the source.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: David Anders <x0132446@ti.com>

3 files changed, 71 insertions, 0 deletions

diff --git a/drivers/video/omap2/dss/dpi.c b/drivers/video/omap2/dss/dpi.c
index 5ccce9b69e42..b7233882fcfd 100644
--- a/drivers/video/omap2/dss/dpi.c
+++ b/drivers/video/omap2/dss/dpi.c
@@ -203,6 +203,10 @@ int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
         if (r)
                 goto err_get_dispc;
 
+        r = dss_dpi_select_source(dssdev->channel);
+        if (r)
+                goto err_src_sel;
+
         if (dpi_use_dsi_pll(dssdev)) {
                 r = dsi_runtime_get(dpi.dsidev);
                 if (r)
@@ -237,6 +241,7 @@ err_dsi_pll_init:
         if (dpi_use_dsi_pll(dssdev))
                 dsi_runtime_put(dpi.dsidev);
 err_get_dsi:
+err_src_sel:
         dispc_runtime_put();
 err_get_dispc:
         if (dss_has_feature(FEAT_DPI_USES_VDDS_DSI))
diff --git a/drivers/video/omap2/dss/dss.c b/drivers/video/omap2/dss/dss.c
index 660813b01197..2ab1c3e96553 100644
--- a/drivers/video/omap2/dss/dss.c
+++ b/drivers/video/omap2/dss/dss.c
@@ -69,6 +69,7 @@ struct dss_features {
         u8 fck_div_max;
         u8 dss_fck_multiplier;
         const char *clk_name;
+        int (*dpi_select_source)(enum omap_channel channel);
 };
 
 static struct {
@@ -623,6 +624,65 @@ enum dss_hdmi_venc_clk_source_select dss_get_hdmi_venc_clk_source(void)
         return REG_GET(DSS_CONTROL, 15, 15);
 }
 
+static int dss_dpi_select_source_omap2_omap3(enum omap_channel channel)
+{
+        if (channel != OMAP_DSS_CHANNEL_LCD)
+                return -EINVAL;
+
+        return 0;
+}
+
+static int dss_dpi_select_source_omap4(enum omap_channel channel)
+{
+        int val;
+
+        switch (channel) {
+        case OMAP_DSS_CHANNEL_LCD2:
+                val = 0;
+                break;
+        case OMAP_DSS_CHANNEL_DIGIT:
+                val = 1;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        REG_FLD_MOD(DSS_CONTROL, val, 17, 17);
+
+        return 0;
+}
+
+static int dss_dpi_select_source_omap5(enum omap_channel channel)
+{
+        int val;
+
+        switch (channel) {
+        case OMAP_DSS_CHANNEL_LCD:
+                val = 1;
+                break;
+        case OMAP_DSS_CHANNEL_LCD2:
+                val = 2;
+                break;
+        case OMAP_DSS_CHANNEL_LCD3:
+                val = 3;
+                break;
+        case OMAP_DSS_CHANNEL_DIGIT:
+                val = 0;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        REG_FLD_MOD(DSS_CONTROL, val, 17, 16);
+
+        return 0;
+}
+
+int dss_dpi_select_source(enum omap_channel channel)
+{
+        return dss.feat->dpi_select_source(channel);
+}
+
 static int dss_get_clocks(void)
 {
         struct clk *clk;
@@ -701,30 +761,35 @@ static const struct dss_features omap24xx_dss_feats __initconst = {
         .fck_div_max            =       16,
         .dss_fck_multiplier     =       2,
         .clk_name               =       NULL,
+        .dpi_select_source      =       &dss_dpi_select_source_omap2_omap3,
 };
 
 static const struct dss_features omap34xx_dss_feats __initconst = {
         .fck_div_max            =       16,
         .dss_fck_multiplier     =       2,
         .clk_name               =       "dpll4_m4_ck",
+        .dpi_select_source      =       &dss_dpi_select_source_omap2_omap3,
 };
 
 static const struct dss_features omap3630_dss_feats __initconst = {
         .fck_div_max            =       32,
         .dss_fck_multiplier     =       1,
         .clk_name               =       "dpll4_m4_ck",
+        .dpi_select_source      =       &dss_dpi_select_source_omap2_omap3,
 };
 
 static const struct dss_features omap44xx_dss_feats __initconst = {
         .fck_div_max            =       32,
         .dss_fck_multiplier     =       1,
         .clk_name               =       "dpll_per_m5x2_ck",
+        .dpi_select_source      =       &dss_dpi_select_source_omap4,
 };
 
 static const struct dss_features omap54xx_dss_feats __initconst = {
         .fck_div_max            =       64,
         .dss_fck_multiplier     =       1,
         .clk_name               =       "dpll_per_h12x2_ck",
+        .dpi_select_source      =       &dss_dpi_select_source_omap5,
 };
 
 static int __init dss_init_features(struct device *dev)
diff --git a/drivers/video/omap2/dss/dss.h b/drivers/video/omap2/dss/dss.h
index 5e9fd7691728..2a51ae99474c 100644
--- a/drivers/video/omap2/dss/dss.h
+++ b/drivers/video/omap2/dss/dss.h
@@ -277,6 +277,7 @@ void dss_overlay_kobj_uninit(struct omap_overlay *ovl);
 int dss_init_platform_driver(void) __init;
 void dss_uninit_platform_driver(void);
 
+int dss_dpi_select_source(enum omap_channel channel);
 void dss_select_hdmi_venc_clk_source(enum dss_hdmi_venc_clk_source_select);
 enum dss_hdmi_venc_clk_source_select dss_get_hdmi_venc_clk_source(void);
 const char *dss_get_generic_clk_source_name(enum omap_dss_clk_source clk_src);