[PATCH 24/72] gpu: ipu-v3: Remove ipu_dmfc_init_channel()

[Steve Longerbeam]

The function ipu_dmfc_init_channel() sets the "WAIT4EOT" mode according
to the line width and the DMFC channel's FIFO size (the slots parameter).
But this can only happen after slots has been calculated in
ipu_dmfc_alloc_bandwidth().

Fix by renaming ipu_dmfc_init_channel() to a static dmfc_set_wait_eot()
which is called at the end of ipu_dmfc_alloc_bandwidth(), after slots
has been calculated.

Signed-off-by: Steve Longerbeam <steve_longerbeam at mentor.com>
---
 drivers/gpu/ipu-v3/ipu-dmfc.c         |   41 +++++++++++++++++----------------
 drivers/staging/imx-drm/ipuv3-plane.c |    8 +------
 include/video/imx-ipu-v3.h            |    3 +--
 3 files changed, 23 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-dmfc.c b/drivers/gpu/ipu-v3/ipu-dmfc.c
index 37a0e41..6ef4932 100644
--- a/drivers/gpu/ipu-v3/ipu-dmfc.c
+++ b/drivers/gpu/ipu-v3/ipu-dmfc.c
@@ -176,6 +176,21 @@ void ipu_dmfc_disable_channel(struct dmfc_channel *dmfc)
 }
 EXPORT_SYMBOL_GPL(ipu_dmfc_disable_channel);
 
+static void dmfc_set_wait_eot(struct dmfc_channel *dmfc, int width)
+{
+	struct ipu_dmfc_priv *priv = dmfc->priv;
+	u32 dmfc_gen1;
+
+	dmfc_gen1 = readl(priv->base + DMFC_GENERAL1);
+
+	if ((dmfc->slots * 64 * 4) / width > dmfc->data->max_fifo_lines)
+		dmfc_gen1 |= 1 << dmfc->data->eot_shift;
+	else
+		dmfc_gen1 &= ~(1 << dmfc->data->eot_shift);
+
+	writel(dmfc_gen1, priv->base + DMFC_GENERAL1);
+}
+
 static int ipu_dmfc_setup_channel(struct dmfc_channel *dmfc, int slots,
 				  int segment, int burstsize)
 {
@@ -312,7 +327,7 @@ EXPORT_SYMBOL_GPL(ipu_dmfc_free_bandwidth);
 
 int ipu_dmfc_alloc_bandwidth(struct dmfc_channel *dmfc,
 			     unsigned long bandwidth_pixel_per_second,
-			     int burstsize)
+			     int width, int burstsize)
 {
 	struct ipu_dmfc_priv *priv = dmfc->priv;
 	int slots = dmfc_bandwidth_to_slots(priv, bandwidth_pixel_per_second);
@@ -347,7 +362,11 @@ int ipu_dmfc_alloc_bandwidth(struct dmfc_channel *dmfc,
 		goto out;
 	}
 
-	ipu_dmfc_setup_channel(dmfc, slots, segment, burstsize);
+	ret = ipu_dmfc_setup_channel(dmfc, slots, segment, burstsize);
+	if (ret)
+		goto out;
+
+	dmfc_set_wait_eot(dmfc, width);
 
 out:
 	mutex_unlock(&priv->mutex);
@@ -356,24 +375,6 @@ out:
 }
 EXPORT_SYMBOL_GPL(ipu_dmfc_alloc_bandwidth);
 
-int ipu_dmfc_init_channel(struct dmfc_channel *dmfc, int width)
-{
-	struct ipu_dmfc_priv *priv = dmfc->priv;
-	u32 dmfc_gen1;
-
-	dmfc_gen1 = readl(priv->base + DMFC_GENERAL1);
-
-	if ((dmfc->slots * 64 * 4) / width > dmfc->data->max_fifo_lines)
-		dmfc_gen1 |= 1 << dmfc->data->eot_shift;
-	else
-		dmfc_gen1 &= ~(1 << dmfc->data->eot_shift);
-
-	writel(dmfc_gen1, priv->base + DMFC_GENERAL1);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(ipu_dmfc_init_channel);
-
 struct dmfc_channel *ipu_dmfc_get(struct ipu_soc *ipu, int ipu_channel)
 {
 	struct ipu_dmfc_priv *priv = ipu->dmfc_priv;
diff --git a/drivers/staging/imx-drm/ipuv3-plane.c b/drivers/staging/imx-drm/ipuv3-plane.c
index 798125e..365cdfe 100644
--- a/drivers/staging/imx-drm/ipuv3-plane.c
+++ b/drivers/staging/imx-drm/ipuv3-plane.c
@@ -158,15 +158,9 @@ int ipu_plane_mode_set(struct ipu_plane *ipu_plane, struct drm_crtc *crtc,
 		break;
 	}
 
-	ret = ipu_dmfc_init_channel(ipu_plane->dmfc, crtc_w);
-	if (ret) {
-		dev_err(dev, "initializing dmfc channel failed with %d\n", ret);
-		return ret;
-	}
-
 	ret = ipu_dmfc_alloc_bandwidth(ipu_plane->dmfc,
 			calc_bandwidth(crtc_w, crtc_h,
-				       calc_vref(mode)), 64);
+				       calc_vref(mode)), crtc_w, 64);
 	if (ret) {
 		dev_err(dev, "allocating dmfc bandwidth failed with %d\n", ret);
 		return ret;
diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h
index 31b6fde..0eb7468 100644
--- a/include/video/imx-ipu-v3.h
+++ b/include/video/imx-ipu-v3.h
@@ -271,9 +271,8 @@ struct dmfc_channel;
 int ipu_dmfc_enable_channel(struct dmfc_channel *dmfc);
 void ipu_dmfc_disable_channel(struct dmfc_channel *dmfc);
 int ipu_dmfc_alloc_bandwidth(struct dmfc_channel *dmfc,
-		unsigned long bandwidth_mbs, int burstsize);
+		unsigned long bandwidth, int width, int burstsize);
 void ipu_dmfc_free_bandwidth(struct dmfc_channel *dmfc);
-int ipu_dmfc_init_channel(struct dmfc_channel *dmfc, int width);
 struct dmfc_channel *ipu_dmfc_get(struct ipu_soc *ipu, int ipuv3_channel);
 void ipu_dmfc_put(struct dmfc_channel *dmfc);
 
-- 
1.7.9.5