| From d226b4ba360f78f616167bf05c941cb7e0e2e8b1 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Sat, 30 Oct 2021 10:08:50 -0700 |
| Subject: drm/msm/dsi: set default num_data_lanes |
| |
| From: Philip Chen <philipchen@chromium.org> |
| |
| [ 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> |
| --- |
| 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 5613234823f7d..423c4ae2be10d 100644 |
| --- a/drivers/gpu/drm/msm/dsi/dsi_host.c |
| +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c |
| @@ -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; |
| } |
| |
| -- |
| 2.33.0 |
| |
