[PATCH 4/6] drm/msm: add a kernel param to select between MDP5 and DPU drivers

[Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>]

For some of the platforms (e.g. SDM660, SDM630, MSM8996, etc.) it is
possible to support this platform via the DPU driver (e.g. to provide
support for DP, multirect, etc). Add a modparam to be able to switch
between these two drivers.

All platforms supported by both drivers are by default handled by the
MDP5 driver. To let them be handled by the DPU driver pass the
`msm.prefer_mdp5=false` kernel param.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c  |  3 +++
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c |  3 +++
 drivers/gpu/drm/msm/msm_drv.c            | 31 ++++++++++++++++++++++++
 drivers/gpu/drm/msm/msm_drv.h            |  1 +
 4 files changed, 38 insertions(+)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
index a9ba67e24e11..f3cb8c2ada5e 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c
@@ -1351,6 +1351,9 @@ static int dpu_kms_init(struct drm_device *ddev)
 
 static int dpu_dev_probe(struct platform_device *pdev)
 {
+	if (!msm_disp_drv_should_bind(&pdev->dev, true))
+		return -ENODEV;
+
 	return msm_drv_probe(&pdev->dev, dpu_kms_init);
 }
 
diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
index 92bf9d949d09..3828725683a7 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
@@ -935,6 +935,9 @@ static int mdp5_dev_probe(struct platform_device *pdev)
 
 	DBG("");
 
+	if (!msm_disp_drv_should_bind(&pdev->dev, false))
+		return -ENODEV;
+
 	ret = mdp5_setup_interconnect(pdev);
 	if (ret)
 		return ret;
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 4bd028fa7500..1b8ec55704ba 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -1184,6 +1184,37 @@ static int add_components_mdp(struct device *master_dev,
 	return 0;
 }
 
+#if !IS_REACHABLE(CONFIG_DRM_MSM_MDP5) || !IS_REACHABLE(CONFIG_DRM_MSM_DPU)
+bool msm_disp_drv_should_bind(struct device *dev, bool mdp5_driver)
+{
+	/* If just a single driver is enabled, use it no matter what */
+	return true;
+}
+#else
+
+static bool prefer_mdp5 = true;
+MODULE_PARM_DESC(prefer_mdp5, "Select whether MDP5 or DPU driver should be preferred");
+module_param(prefer_mdp5, bool, 0444);
+
+/* list all platforms supported by both mdp5 and dpu drivers */
+static const char *const msm_mdp5_dpu_migration[] = {
+	NULL,
+};
+
+bool msm_disp_drv_should_bind(struct device *dev, bool dpu_driver)
+{
+	/* If it is not an MDP5 device, do not try MDP5 driver */
+	if (!of_device_is_compatible(dev->of_node, "qcom,mdp5"))
+		return dpu_driver;
+
+	/* If it is not in the migration list, use MDP5 */
+	if (!of_device_compatible_match(dev->of_node, msm_mdp5_dpu_migration))
+		return !dpu_driver;
+
+	return prefer_mdp5 ? !dpu_driver : dpu_driver;
+}
+#endif
+
 /*
  * We don't know what's the best binding to link the gpu with the drm device.
  * Fow now, we just hunt for all the possible gpus that we support, and add them
diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
index fdcbb02fa396..05370a03fb44 100644
--- a/drivers/gpu/drm/msm/msm_drv.h
+++ b/drivers/gpu/drm/msm/msm_drv.h
@@ -571,5 +571,6 @@ int msm_drv_probe(struct device *dev,
 	int (*kms_init)(struct drm_device *dev));
 void msm_drv_shutdown(struct platform_device *pdev);
 
+bool msm_disp_drv_should_bind(struct device *dev, bool dpu_driver);
 
 #endif /* __MSM_DRV_H__ */
-- 
2.39.2