[PATCHv2] drm/omap: add OMAP5 DSIPHY lane-enable support

[Tomi Valkeinen]

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.valkei...@ti.com>
---

Changes:

- Fixed the check for DSI model
- Use else if
- Drop the unnecessary syscon check

 drivers/gpu/drm/omapdrm/dss/dsi.c | 50 ++++++++++++++++++++++++++++++++-------
 1 file changed, 42 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c 
b/drivers/gpu/drm/omapdrm/dss/dsi.c
index a66d2b1a6c74..889f2d30050b 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -2109,9 +2109,6 @@ static int dsi_omap4_mux_pads(struct dsi_data *dsi, 
unsigned int lanes)
        u32 pipd_mask, pipd_shift;
        u32 reg;
 
-       if (!dsi->syscon)
-               return 0;
-
        if (dsi->module_id == 0) {
                enable_mask = OMAP4_DSI1_LANEENABLE_MASK;
                enable_shift = OMAP4_DSI1_LANEENABLE_SHIFT;
@@ -2139,14 +2136,48 @@ static int dsi_omap4_mux_pads(struct dsi_data *dsi, 
unsigned int lanes)
        return 0;
 }
 
+#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_mask, enable_shift, reg;
+
+       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;
+
+       enable_mask = OMAP5_DSI_LANEENABLE_MASK << enable_shift;
+
+       regmap_read(dsi->syscon, OMAP5_DSIPHY_SYSCON_OFFSET, &reg);
+       reg &= ~enable_mask;
+       reg |= (lanes << enable_shift) & enable_mask;
+       regmap_write(dsi->syscon, OMAP5_DSIPHY_SYSCON_OFFSET, reg);
+
+       return 0;
+}
+
 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)
@@ -5480,14 +5511,17 @@ 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;
 
-- 
2.7.4


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