After spending a non-negligible time trying to figure out why dpu_kms_init() would dereference a NULL dpu_kms->pdev, it turns out that in addition to adding the new compatible to the msm_drv of_match_table one also need to teach add_display_components() to register the child nodes - which includes the DPU platform_device.
Replace the open coded test for compatibles with a check against the match data of the mdss device to save others this trouble in the future.
Signed-off-by: Bjorn Andersson bjorn.andersson@linaro.org --- drivers/gpu/drm/msm/msm_drv.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c index 94525ac76d4e..0f6e186a609d 100644 --- a/drivers/gpu/drm/msm/msm_drv.c +++ b/drivers/gpu/drm/msm/msm_drv.c @@ -1173,10 +1173,11 @@ static int compare_name_mdp(struct device *dev, void *data) return (strstr(dev_name(dev), "mdp") != NULL); }
-static int add_display_components(struct device *dev, +static int add_display_components(struct platform_device *pdev, struct component_match **matchptr) { struct device *mdp_dev; + struct device *dev = &pdev->dev; int ret;
/* @@ -1185,9 +1186,9 @@ static int add_display_components(struct device *dev, * Populate the children devices, find the MDP5/DPU node, and then add * the interfaces to our components list. */ - if (of_device_is_compatible(dev->of_node, "qcom,mdss") || - of_device_is_compatible(dev->of_node, "qcom,sdm845-mdss") || - of_device_is_compatible(dev->of_node, "qcom,sc7180-mdss")) { + switch (get_mdp_ver(pdev)) { + case KMS_MDP5: + case KMS_DPU: ret = of_platform_populate(dev->of_node, NULL, NULL, dev); if (ret) { DRM_DEV_ERROR(dev, "failed to populate children devices\n"); @@ -1206,9 +1207,11 @@ static int add_display_components(struct device *dev, /* add the MDP component itself */ drm_of_component_match_add(dev, matchptr, compare_of, mdp_dev->of_node); - } else { + break; + case KMS_MDP4: /* MDP4 */ mdp_dev = dev; + break; }
ret = add_components_mdp(mdp_dev, matchptr); @@ -1273,7 +1276,7 @@ static int msm_pdev_probe(struct platform_device *pdev) int ret;
if (get_mdp_ver(pdev)) { - ret = add_display_components(&pdev->dev, &match); + ret = add_display_components(pdev, &match); if (ret) return ret; }