[PATCH 20/23] drm: omapdrm: panel-dsi-cm: add offset support

[Sebastian Reichel]

The Nokia N950 contains a panel, that is partially
covered, so that not the whole display is visible.
Thus the image must be displayed with an offset.

Signed-off-by: Sebastian Reichel <sre at kernel.org>
---
 drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c 
b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
index 4c1e76da68cd..c60bc3013ff4 100644
--- a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
+++ b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
@@ -45,6 +45,8 @@ struct panel_drv_data {
        struct omap_dss_device *in;

        struct omap_video_timings timings;
+       int offset_x;
+       int offset_y;

        struct platform_device *pdev;

@@ -203,12 +205,17 @@ static int dsicm_set_update_window(struct panel_drv_data 
*ddata,
 {
        struct omap_dss_device *in = ddata->in;
        int r;
-       u16 x1 = x;
-       u16 x2 = x + w - 1;
-       u16 y1 = y;
-       u16 y2 = y + h - 1;
-
        u8 buf[5];
+       u16 x1, x2, y1, y2;
+
+       x += ddata->offset_x;
+       y += ddata->offset_y;
+
+       x1 = x;
+       x2 = x + w - 1;
+       y1 = y;
+       y2 = y + h - 1;
+
        buf[0] = MIPI_DCS_SET_COLUMN_ADDRESS;
        buf[1] = (x1 >> 8) & 0xff;
        buf[2] = (x1 >> 0) & 0xff;
@@ -1244,6 +1251,8 @@ static int dsicm_probe_of(struct platform_device *pdev)

        of_property_read_u32(node, "resolution-x", (u32*) 
&ddata->timings.x_res);
        of_property_read_u32(node, "resolution-y", (u32*) 
&ddata->timings.y_res);
+       of_property_read_u32(node, "offset-x", &ddata->offset_x);
+       of_property_read_u32(node, "offset-y", &ddata->offset_y);

        ddata->timings.pixelclock = ddata->timings.x_res * ddata->timings.y_res 
* 60;

@@ -1273,6 +1282,8 @@ static int dsicm_probe(struct platform_device *pdev)
        ddata->timings.x_res = 864;
        ddata->timings.y_res = 480;
        ddata->timings.pixelclock = 864 * 480 * 60;
+       ddata->offset_x = 0;
+       ddata->offset_y = 0;

        if (dev_get_platdata(dev)) {
                r = dsicm_probe_pdata(pdev);
-- 
2.7.0