Commit b6158d96 authored Oct 30, 2021 by Philip Chen Committed by Greg Kroah-Hartman Dec 17, 2021

drm/msm/dsi: set default num_data_lanes



[ Upstream commit cd92cc187c053ab010a1570e2d61d68394a5c725 ]

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: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/20211030100812.1.I6cd9af36b723fed277d34539d3b2ba4ca233ad2d@changeid


Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent d731ecc6

drivers/gpu/drm/msm/dsi/dsi_host.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1669,6 +1669,8 @@ 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;
		}