[PATCH 23/23] drm: omapdrm: panel-dsi-cm: provide timings methods for omapdrm

[Sebastian Reichel]

Provide omapdrm with methods to acquire timings
and check them later, so that it can properly
initialize the display.

Signed-off-by: Sebastian Reichel <sre at kernel.org>
---
 drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c | 38 +++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c 
b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
index 196fe8d18ff4..edd1298b3a71 100644
--- a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
+++ b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
@@ -1163,6 +1163,41 @@ static void dsicm_ulps_work(struct work_struct *work)
        mutex_unlock(&ddata->lock);
 }

+static void dsicm_get_timings(struct omap_dss_device *dssdev,
+               struct omap_video_timings *timings)
+{
+       struct panel_drv_data *ddata = to_panel_data(dssdev);
+
+       *timings = ddata->timings;
+}
+
+static int dsicm_check_timings(struct omap_dss_device *dssdev,
+               struct omap_video_timings *timings)
+{
+       struct panel_drv_data *ddata = to_panel_data(dssdev);
+       int ret = 0;
+
+       if (timings->x_res != ddata->timings.x_res)
+               ret = -EINVAL;
+       else if (timings->y_res != ddata->timings.y_res)
+               ret = -EINVAL;
+
+       /* pixelclock is modified by dsi, so not easily checkable */
+
+       /* vfp, vbp, hfp, hbp are (re-)configured automatically by dsi */
+
+       if (ret) {
+               dev_warn(dssdev->dev, "wrong resolution: %d x %d",
+                       timings->x_res, timings->y_res);
+               dev_warn(dssdev->dev, "panel resolution: %d x %d",
+                       ddata->timings.x_res, ddata->timings.y_res);
+       } else {
+               dev_dbg(dssdev->dev, "mode check: ok");
+       }
+
+       return ret;
+}
+
 static struct omap_dss_driver dsicm_ops = {
        .connect        = dsicm_connect,
        .disconnect     = dsicm_disconnect,
@@ -1180,6 +1215,9 @@ static struct omap_dss_driver dsicm_ops = {
        .get_te         = dsicm_get_te,

        .memory_read    = dsicm_memory_read,
+
+       .get_timings    = dsicm_get_timings,
+       .check_timings  = dsicm_check_timings,
 };

 static int dsicm_probe_pdata(struct platform_device *pdev)
-- 
2.7.0