If "data_lanes" property of the dsi output endpoint is missing in
the DT, num_data_lanes would be 0 by default, which could cause
dsi_host_attach() to fail if dsi->lanes is set to a non-zero value
by the bridge driver.
According to the binding document of msm dsi controller, the
input/output endpoint of the controller is expected to have 4 lanes.
So let's set num_data_lanes to 4 by default.
Signed-off-by: Philip Chen <philipchen@xxxxxxxxxxxx>
---
drivers/gpu/drm/msm/dsi/dsi_host.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index c86b5090fae6..a32eb33dfc14 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1696,6 +1696,8 @@ static int dsi_host_parse_lane_data(struct msm_dsi_host *msm_host,
if (!prop) {
DRM_DEV_DEBUG(dev,
"failed to find data lane mapping, using default\n");
+ /* Set the number of date lanes to 4 by default. */
+ msm_host->num_data_lanes = 4;
return 0;
}
--
2.33.1.1089.g2158813163f-goog
