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@ti.com --- 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 4e58343d5db2..4604ad36d566 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 */ @@ -192,12 +200,21 @@ 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; @@ -205,8 +222,38 @@ 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)