mtk_drm_find_possible_crtc_by_comp() assumed that the main path will
always have the CRTC with id 0, the ext id 1 and the third id 2. This
is only true if the paths are all available. But paths are optional (see
also comment in mtk_drm_kms_init()), e.g. the main path might not be
enabled or available at all. Then the CRTC IDs will shift one up, e.g.
ext will be 1 and the third path will be 2.
To fix that, dynamically calculate the IDs by the precence of the paths.
Fixes: 5aa8e7647676 ("drm/mediatek: dpi/dsi: Change the getting possible_crtc way")
Suggested-by: Nícolas F. R. A. Prado <nfraprado@xxxxxxxxxxxxx>
Signed-off-by: Michael Walle <mwalle@xxxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 41 ++++++++++++++-------
1 file changed, 27 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
index 771f4e173353..f3064bff64e8 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
@@ -526,21 +526,34 @@ unsigned int mtk_drm_find_possible_crtc_by_comp(struct drm_device *drm,
struct device *dev)
{
struct mtk_drm_private *private = drm->dev_private;
- unsigned int ret = 0;
-
- if (mtk_drm_find_comp_in_ddp(dev, private->data->main_path, private->data->main_len,
- private->ddp_comp))
- ret = BIT(0);
- else if (mtk_drm_find_comp_in_ddp(dev, private->data->ext_path,
- private->data->ext_len, private->ddp_comp))
- ret = BIT(1);
- else if (mtk_drm_find_comp_in_ddp(dev, private->data->third_path,
- private->data->third_len, private->ddp_comp))
- ret = BIT(2);
- else
- DRM_INFO("Failed to find comp in ddp table\n");
+ int i = 0;
+
+ if (private->data->main_path) {
+ if (mtk_drm_find_comp_in_ddp(dev, private->data->main_path,
+ private->data->main_len,
+ private->ddp_comp))
+ return BIT(i);
+ i++;
+ }
+
+ if (private->data->ext_path) {
+ if (mtk_drm_find_comp_in_ddp(dev, private->data->ext_path,
+ private->data->ext_len,
+ private->ddp_comp))
+ return BIT(i);
+ i++;
+ }
- return ret;
+ if (private->data->third_path) {
+ if (mtk_drm_find_comp_in_ddp(dev, private->data->third_path,
+ private->data->third_len,
+ private->ddp_comp))
+ return BIT(i);
+ i++;
+ }
+
+ DRM_INFO("Failed to find comp in ddp table\n");
+ return 0;
}
int mtk_ddp_comp_init(struct device_node *node, struct mtk_ddp_comp *comp,
--
2.39.2
