| Message ID | 20211030100812.1.I6cd9af36b723fed277d34539d3b2ba4ca233ad2d@changeid (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | drm/msm/dsi: set default num_data_lanes | expand |
Hi, On Sat, Oct 30, 2021 at 10:08 AM Philip Chen <philipchen@chromium.org> wrote: > > 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@chromium.org> > --- > > drivers/gpu/drm/msm/dsi/dsi_host.c | 2 ++ > 1 file changed, 2 insertions(+) Reviewed-by: Douglas Anderson <dianders@chromium.org>
Quoting Philip Chen (2021-10-30 10:08:50) > 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@chromium.org> > --- Reviewed-by: Stephen Boyd <swboyd@chromium.org>
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; }
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@chromium.org> --- drivers/gpu/drm/msm/dsi/dsi_host.c | 2 ++ 1 file changed, 2 insertions(+)