[PATCH v3] drm/msm/mdp5: stop overriding drvdata

[Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>]

The rest of the code expects that master's device drvdata is the
struct msm_drm_private instance. Do not override the mdp5's drvdata.

Fixes: 6874f48bb8b0 ("drm/msm: make mdp5/dpu devices master components")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
---
Abhinav, Rob, please pick this for -fixes.

This is an updated version of [1]. Fixed the read_mdp_hw_revision()
function. PM runtime isn't available at the moment, as priv->kms is not
set.

[1] https://patchwork.freedesktop.org/patch/490326/?series=105392&rev=1

Changes since v2:
- Removed the clause checking whether mdp5_enable() has failed (it can
  not fail, noted by Abhinav)

Changes since v1:
- Expanded the patch to also handle the read_mdp_hw_revision() and also
  to move pm enablement to the place where the pm_runtime can actually
  be used.

---
 drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c | 32 +++++++++++++-----------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
index b0d21838a134..b46f983f2b46 100644
--- a/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
+++ b/drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c
@@ -203,7 +203,7 @@ static int mdp5_set_split_display(struct msm_kms *kms,
 							  slave_encoder);
 }
 
-static void mdp5_destroy(struct platform_device *pdev);
+static void mdp5_destroy(struct mdp5_kms *mdp5_kms);
 
 static void mdp5_kms_destroy(struct msm_kms *kms)
 {
@@ -223,7 +223,7 @@ static void mdp5_kms_destroy(struct msm_kms *kms)
 	}
 
 	mdp_kms_destroy(&mdp5_kms->base);
-	mdp5_destroy(mdp5_kms->pdev);
+	mdp5_destroy(mdp5_kms);
 }
 
 #ifdef CONFIG_DEBUG_FS
@@ -519,9 +519,10 @@ static void read_mdp_hw_revision(struct mdp5_kms *mdp5_kms,
 	struct device *dev = &mdp5_kms->pdev->dev;
 	u32 version;
 
-	pm_runtime_get_sync(dev);
+	/* Manually enable the MDP5, as pm runtime isn't usable yet. */
+	mdp5_enable(mdp5_kms);
 	version = mdp5_read(mdp5_kms, REG_MDP5_HW_VERSION);
-	pm_runtime_put_sync(dev);
+	mdp5_disable(mdp5_kms);
 
 	*major = FIELD(version, MDP5_HW_VERSION_MAJOR);
 	*minor = FIELD(version, MDP5_HW_VERSION_MINOR);
@@ -559,6 +560,8 @@ static int mdp5_kms_init(struct drm_device *dev)
 	int irq, i, ret;
 
 	ret = mdp5_init(to_platform_device(dev->dev), dev);
+	if (ret)
+		return ret;
 
 	/* priv->kms would have been populated by the MDP5 driver */
 	kms = priv->kms;
@@ -632,9 +635,8 @@ static int mdp5_kms_init(struct drm_device *dev)
 	return ret;
 }
 
-static void mdp5_destroy(struct platform_device *pdev)
+static void mdp5_destroy(struct mdp5_kms *mdp5_kms)
 {
-	struct mdp5_kms *mdp5_kms = platform_get_drvdata(pdev);
 	int i;
 
 	if (mdp5_kms->ctlm)
@@ -648,7 +650,7 @@ static void mdp5_destroy(struct platform_device *pdev)
 		kfree(mdp5_kms->intfs[i]);
 
 	if (mdp5_kms->rpm_enabled)
-		pm_runtime_disable(&pdev->dev);
+		pm_runtime_disable(&mdp5_kms->pdev->dev);
 
 	drm_atomic_private_obj_fini(&mdp5_kms->glob_state);
 	drm_modeset_lock_fini(&mdp5_kms->glob_state_lock);
@@ -797,8 +799,6 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
 		goto fail;
 	}
 
-	platform_set_drvdata(pdev, mdp5_kms);
-
 	spin_lock_init(&mdp5_kms->resource_lock);
 
 	mdp5_kms->dev = dev;
@@ -839,9 +839,6 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
 	 */
 	clk_set_rate(mdp5_kms->core_clk, 200000000);
 
-	pm_runtime_enable(&pdev->dev);
-	mdp5_kms->rpm_enabled = true;
-
 	read_mdp_hw_revision(mdp5_kms, &major, &minor);
 
 	mdp5_kms->cfg = mdp5_cfg_init(mdp5_kms, major, minor);
@@ -893,10 +890,13 @@ static int mdp5_init(struct platform_device *pdev, struct drm_device *dev)
 	/* set uninit-ed kms */
 	priv->kms = &mdp5_kms->base.base;
 
+	pm_runtime_enable(&pdev->dev);
+	mdp5_kms->rpm_enabled = true;
+
 	return 0;
 fail:
 	if (mdp5_kms)
-		mdp5_destroy(pdev);
+		mdp5_destroy(mdp5_kms);
 	return ret;
 }
 
@@ -953,7 +953,8 @@ static int mdp5_dev_remove(struct platform_device *pdev)
 static __maybe_unused int mdp5_runtime_suspend(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
-	struct mdp5_kms *mdp5_kms = platform_get_drvdata(pdev);
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
+	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
 
 	DBG("");
 
@@ -963,7 +964,8 @@ static __maybe_unused int mdp5_runtime_suspend(struct device *dev)
 static __maybe_unused int mdp5_runtime_resume(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
-	struct mdp5_kms *mdp5_kms = platform_get_drvdata(pdev);
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
+	struct mdp5_kms *mdp5_kms = to_mdp5_kms(to_mdp_kms(priv->kms));
 
 	DBG("");
 
-- 
2.35.1