[Freedreno] [PATCH] drm/msm: Do not run snapshot on non-DPU devices

[Fabio Estevam]

Hi Abhinav,

On Wed, Sep 15, 2021 at 11:22 PM <abhinavk at codeaurora.org> wrote:

> Are you not using DPU or are you not using mdp4/mdp5 as well? Even if
> you are using any of mdps, kms should
> not be NULL. Hence wanted to check the test case.

I am running i.MX53, which is an NXP SoC, not Qualcomm's.

It does not use DPU, nor MDP4/5 and kms is NULL in this case.

Some debug prints to confirm:

--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -557,18 +557,22 @@ static int msm_drm_init(struct device *dev,
const struct drm_driver *drv)
        case KMS_MDP4:
                kms = mdp4_kms_init(ddev);
                priv->kms = kms;
+               pr_err("******** KMS_MDP4\n");
                break;
        case KMS_MDP5:
                kms = mdp5_kms_init(ddev);
+               pr_err("******** KMS_MDP5\n");
                break;
        case KMS_DPU:
                kms = dpu_kms_init(ddev);
+               pr_err("******** KMS_DPU\n");
                priv->kms = kms;
                break;
        default:
                /* valid only for the dummy headless case, where of_node=NULL */
                WARN_ON(dev->of_node);
                kms = NULL;
+               pr_err("******** KMS is NULL\n");
                break;
        }

# dmesg | grep KMS
[    3.153215] ******** KMS is NULL