drm/omap: add OMAP5 DSIPHY lane-enable support

We are missing OMAP5 DSIPHY lane-enable support, which has prevented
OMAP5 DSI working in mainline. This patch adds the lane-enable similarly
to the recently added OMAP4 version.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 39 insertions, 8 deletions

diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index 1855d69b211d..b56a05730314 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -2108,9 +2108,6 @@ static int dsi_omap4_mux_pads(struct dsi_data *dsi, unsigned int lanes)
         u32 enable_mask, enable_shift;
         u32 pipd_mask, pipd_shift;
 
-        if (!dsi->syscon)
-                return 0;
-
         if (dsi->module_id == 0) {
                 enable_mask = OMAP4_DSI1_LANEENABLE_MASK;
                 enable_shift = OMAP4_DSI1_LANEENABLE_SHIFT;
@@ -2130,14 +2127,45 @@ static int dsi_omap4_mux_pads(struct dsi_data *dsi, unsigned int lanes)
                 (lanes << enable_shift) | (lanes << pipd_shift));
 }
 
+/* OMAP5 CONTROL_DSIPHY */
+
+#define OMAP5_DSIPHY_SYSCON_OFFSET      0x74
+
+#define OMAP5_DSI1_LANEENABLE_SHIFT     24
+#define OMAP5_DSI2_LANEENABLE_SHIFT     19
+#define OMAP5_DSI_LANEENABLE_MASK       0x1f
+
+static int dsi_omap5_mux_pads(struct dsi_data *dsi, unsigned int lanes)
+{
+        u32 enable_shift;
+
+        if (dsi->module_id == 0)
+                enable_shift = OMAP5_DSI1_LANEENABLE_SHIFT;
+        else if (dsi->module_id == 1)
+                enable_shift = OMAP5_DSI2_LANEENABLE_SHIFT;
+        else
+                return -ENODEV;
+
+        return regmap_update_bits(dsi->syscon, OMAP5_DSIPHY_SYSCON_OFFSET,
+                OMAP5_DSI_LANEENABLE_MASK << enable_shift,
+                lanes << enable_shift);
+}
+
 static int dsi_enable_pads(struct dsi_data *dsi, unsigned int lane_mask)
 {
-        return dsi_omap4_mux_pads(dsi, lane_mask);
+        if (dsi->data->model == DSI_MODEL_OMAP4)
+                return dsi_omap4_mux_pads(dsi, lane_mask);
+        if (dsi->data->model == DSI_MODEL_OMAP5)
+                return dsi_omap5_mux_pads(dsi, lane_mask);
+        return 0;
 }
 
 static void dsi_disable_pads(struct dsi_data *dsi)
 {
-        dsi_omap4_mux_pads(dsi, 0);
+        if (dsi->data->model == DSI_MODEL_OMAP4)
+                dsi_omap4_mux_pads(dsi, 0);
+        else if (dsi->data->model == DSI_MODEL_OMAP5)
+                dsi_omap5_mux_pads(dsi, 0);
 }
 
 static int dsi_cio_init(struct platform_device *dsidev)
@@ -5471,14 +5499,17 @@ static int dsi_bind(struct device *dev, struct device *master, void *data)
 
         dsi->module_id = d->id;
 
-        if (dsi->data->model == DSI_MODEL_OMAP4) {
+        if (dsi->data->model == DSI_MODEL_OMAP4 ||
+            dsi->data->model == DSI_MODEL_OMAP5) {
                 struct device_node *np;
 
                 /*
-                 * The OMAP4 display DT bindings don't reference the padconf
+                 * The OMAP4/5 display DT bindings don't reference the padconf
                  * syscon. Our only option to retrieve it is to find it by name.
                  */
-                np = of_find_node_by_name(NULL, "omap4_padconf_global");
+                np = of_find_node_by_name(NULL,
+                        dsi->data->model == DSI_MODEL_OMAP4 ?
+                        "omap4_padconf_global" : "omap5_padconf_global");
                 if (!np)
                         return -ENODEV;