[PATCH 3/3] drm/exynos: remove drm_iommu_attach_device_if_possible

[Joonyoung Shim]

Already drm_iommu_attach_device checks whether support iommu internally.
It should clear channels always regardless iommu support. We didn't know
because we can detect the problem when iommu is enabled, so we don't
have to use drm_iommu_attach_device_if_possible and then we can remove
drm_iommu_attach_device_if_possible and clear_channels function pointer.

Signed-off-by: Joonyoung Shim <jy0922.shim at samsung.com>
---
 drivers/gpu/drm/exynos/exynos5433_drm_decon.c |  5 +++--
 drivers/gpu/drm/exynos/exynos7_drm_decon.c    |  5 +++--
 drivers/gpu/drm/exynos/exynos_drm_drv.h       |  1 -
 drivers/gpu/drm/exynos/exynos_drm_fimd.c      |  5 +++--
 drivers/gpu/drm/exynos/exynos_drm_iommu.c     | 11 -----------
 drivers/gpu/drm/exynos/exynos_drm_iommu.h     | 11 -----------
 drivers/gpu/drm/exynos/exynos_mixer.c         |  3 +--
 7 files changed, 10 insertions(+), 31 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
index ba43437..b2794f8 100644
--- a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
@@ -463,7 +463,6 @@ static struct exynos_drm_crtc_ops decon_crtc_ops = {
 	.win_commit		= decon_win_commit,
 	.win_disable		= decon_win_disable,
 	.te_handler		= decon_te_irq_handler,
-	.clear_channels		= decon_clear_channels,
 };
 
 static int decon_bind(struct device *dev, struct device *master, void *data)
@@ -497,7 +496,9 @@ static int decon_bind(struct device *dev, struct device *master, void *data)
 		goto err;
 	}
 
-	ret = drm_iommu_attach_device_if_possible(ctx->crtc, drm_dev, dev);
+	decon_clear_channels(ctx->crtc);
+
+	ret = drm_iommu_attach_device(drm_dev, dev);
 	if (ret)
 		goto err;
 
diff --git a/drivers/gpu/drm/exynos/exynos7_drm_decon.c b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
index 2c29635..a80b918 100644
--- a/drivers/gpu/drm/exynos/exynos7_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos7_drm_decon.c
@@ -126,7 +126,9 @@ static int decon_ctx_initialize(struct decon_context *ctx,
 	ctx->drm_dev = drm_dev;
 	ctx->pipe = priv->pipe++;
 
-	ret = drm_iommu_attach_device_if_possible(ctx->crtc, drm_dev, ctx->dev);
+	decon_clear_channels(ctx->crtc);
+
+	ret = drm_iommu_attach_device(drm_dev, ctx->dev);
 	if (ret)
 		priv->pipe--;
 
@@ -622,7 +624,6 @@ static const struct exynos_drm_crtc_ops decon_crtc_ops = {
 	.wait_for_vblank = decon_wait_for_vblank,
 	.win_commit = decon_win_commit,
 	.win_disable = decon_win_disable,
-	.clear_channels = decon_clear_channels,
 };
 
 
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.h b/drivers/gpu/drm/exynos/exynos_drm_drv.h
index dd00f16..7da593f 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.h
@@ -177,7 +177,6 @@ struct exynos_drm_crtc_ops {
 	void (*win_disable)(struct exynos_drm_crtc *crtc, unsigned int zpos);
 	void (*te_handler)(struct exynos_drm_crtc *crtc);
 	void (*clock_enable)(struct exynos_drm_crtc *crtc, bool enable);
-	void (*clear_channels)(struct exynos_drm_crtc *crtc);
 };
 
 /*
diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index 300730c..8d362b9 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -887,7 +887,6 @@ static const struct exynos_drm_crtc_ops fimd_crtc_ops = {
 	.win_disable = fimd_win_disable,
 	.te_handler = fimd_te_handler,
 	.clock_enable = fimd_dp_clock_enable,
-	.clear_channels = fimd_clear_channels,
 };
 
 static irqreturn_t fimd_irq_handler(int irq, void *dev_id)
@@ -957,7 +956,9 @@ static int fimd_bind(struct device *dev, struct device *master, void *data)
 	if (ctx->display)
 		exynos_drm_create_enc_conn(drm_dev, ctx->display);
 
-	ret = drm_iommu_attach_device_if_possible(ctx->crtc, drm_dev, dev);
+	fimd_clear_channels(ctx->crtc);
+
+	ret = drm_iommu_attach_device(drm_dev, dev);
 	if (ret)
 		priv->pipe--;
 
diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.c b/drivers/gpu/drm/exynos/exynos_drm_iommu.c
index 4c2ec1b..055e8ec 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_iommu.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.c
@@ -142,14 +142,3 @@ void drm_iommu_detach_device(struct drm_device *drm_dev,
 	iommu_detach_device(mapping->domain, subdrv_dev);
 	drm_release_iommu_mapping(drm_dev);
 }
-
-int drm_iommu_attach_device_if_possible(struct exynos_drm_crtc *exynos_crtc,
-			struct drm_device *drm_dev, struct device *subdrv_dev)
-{
-	if (is_drm_iommu_supported(drm_dev)) {
-		if (exynos_crtc->ops->clear_channels)
-			exynos_crtc->ops->clear_channels(exynos_crtc);
-	}
-
-	return drm_iommu_attach_device(drm_dev, subdrv_dev);
-}
diff --git a/drivers/gpu/drm/exynos/exynos_drm_iommu.h b/drivers/gpu/drm/exynos/exynos_drm_iommu.h
index a90357f..dc1b544 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_iommu.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_iommu.h
@@ -34,10 +34,6 @@ static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
 	return dev->archdata.mapping ? true : false;
 }
 
-int drm_iommu_attach_device_if_possible(
-		struct exynos_drm_crtc *exynos_crtc, struct drm_device *drm_dev,
-		struct device *subdrv_dev);
-
 #else
 
 static inline int drm_create_iommu_mapping(struct drm_device *drm_dev)
@@ -65,12 +61,5 @@ static inline bool is_drm_iommu_supported(struct drm_device *drm_dev)
 	return false;
 }
 
-static inline int drm_iommu_attach_device_if_possible(
-		struct exynos_drm_crtc *exynos_crtc, struct drm_device *drm_dev,
-		struct device *subdrv_dev)
-{
-	return 0;
-}
-
 #endif
 #endif
diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 1a01c48..8c461b1 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -881,8 +881,7 @@ static int mixer_initialize(struct mixer_context *mixer_ctx,
 		}
 	}
 
-	ret = drm_iommu_attach_device_if_possible(mixer_ctx->crtc, drm_dev,
-								mixer_ctx->dev);
+	ret = drm_iommu_attach_device(drm_dev, mixer_ctx->dev);
 	if (ret)
 		priv->pipe--;
 
-- 
1.9.1