omapdrm.displays (int array) can be used to reorder the displays by id if
needed. It can be also used to disable display.
If the board have two active displays:
0 - LCD
1 - HDMI
then:
omapdrm.displays=0,1 - represents the original order (LCD, HDMI)
omapdrm.displays=1,0 - represents reverse order (HDMI, LCD)
omapdrm.displays=0 - only the LCD is enabled
omapdrm.displays=1 - only the HDMI is enabled
omapdrm.displays=-1 - disable all displays
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@xxxxxx>
---
drivers/gpu/drm/omapdrm/omap_drv.c | 55 +++++++++++++++++++++++++++++++++++---
1 file changed, 51 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index 0e100a359d26..ce260c48d686 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -36,6 +36,14 @@
#define DRIVER_MINOR 0
#define DRIVER_PATCHLEVEL 0
+#define MAX_NR_DISPLAYS 8
+static int display_order[MAX_NR_DISPLAYS];
+static int display_order_nelm;
+module_param_array_named(displays, display_order, int, &display_order_nelm,
+ 0444);
+MODULE_PARM_DESC(displays,
+ "ID array to specify the order of the active displays");
+
/*
* mode config funcs
*/
@@ -183,12 +191,21 @@ static int omap_compare_dssdevs(const void *a, const void *b)
static void omap_collect_dssdevs(struct drm_device *ddev)
{
struct omap_drm_private *priv = ddev->dev_private;
+ struct omap_dss_device *dssdevs[ARRAY_SIZE(priv->dssdevs)];
struct omap_dss_device *dssdev = NULL;
+ int num_dssdevs = 0;
+ unsigned long dssdev_mask = 0;
+ int i;
+
+ /* No displays should be enabled */
+ if (display_order_nelm == 1 && display_order[0] < 0)
+ return;
for_each_dss_dev(dssdev) {
omap_dss_get_device(dssdev);
- priv->dssdevs[priv->num_dssdevs++] = dssdev;
- if (priv->num_dssdevs == ARRAY_SIZE(priv->dssdevs)) {
+ set_bit(num_dssdevs, &dssdev_mask);
+ dssdevs[num_dssdevs++] = dssdev;
+ if (num_dssdevs == ARRAY_SIZE(dssdevs)) {
/* To balance the 'for_each_dss_dev' loop */
omap_dss_put_device(dssdev);
break;
@@ -196,8 +213,38 @@ static void omap_collect_dssdevs(struct drm_device *ddev)
}
/* Sort the list by DT aliases */
- sort(priv->dssdevs, priv->num_dssdevs, sizeof(priv->dssdevs[0]),
- omap_compare_dssdevs, NULL);
+ sort(dssdevs, num_dssdevs, sizeof(dssdevs[0]), omap_compare_dssdevs,
+ NULL);
+
+ /* Do ordering based on the display_order parameter array */
+ for (i = 0; i < display_order_nelm; i++) {
+ int old_index = display_order[i];
+
+ if ((old_index >= 0 && old_index < num_dssdevs) &&
+ (dssdev_mask & BIT(old_index))) {
+ priv->dssdevs[priv->num_dssdevs++] = dssdevs[old_index];
+ clear_bit(old_index, &dssdev_mask);
+ } else {
+ dev_err(ddev->dev,
+ "Ignoring invalid displays module parameter\n");
+ priv->num_dssdevs = 0;
+ break;
+ }
+ }
+
+ /* if the target list is empty, copy the collected dssdevs, if any */
+ if (priv->num_dssdevs == 0) {
+ for (i = 0; i < num_dssdevs; i++)
+ priv->dssdevs[i] = dssdevs[i];
+
+ priv->num_dssdevs = num_dssdevs;
+ } else {
+ u32 idx;
+
+ /* check if we have dssdev which is not carried over */
+ for_each_set_bit(idx, &dssdev_mask, ARRAY_SIZE(dssdevs))
+ omap_dss_put_device(dssdevs[idx]);
+ }
}
static int omap_connect_dssdevs(struct drm_device *ddev)
--
2.14.1
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