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authorSteve Longerbeam <slongerbeam@gmail.com>2014-06-26 03:05:44 +0200
committerPhilipp Zabel <p.zabel@pengutronix.de>2014-09-02 14:55:50 +0200
commit2bcf577eb6361827f8347529803528031033cb83 (patch)
treeb7438efe169e4d59d3596aa2a50f1b73e090354b
parentgpu: ipu-v3: Add ipu_stride_to_bytes() (diff)
downloadlinux-2bcf577eb6361827f8347529803528031033cb83.tar.xz
linux-2bcf577eb6361827f8347529803528031033cb83.zip
gpu: ipu-v3: Add ipu_idmac_enable_watermark()
Adds the function ipu_idmac_enable_watermark(), which enables or disables watermarking in the IDMAC channel. Enabling watermarking can increase a channel's AXI bus arbitration priority. Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
-rw-r--r--drivers/gpu/ipu-v3/ipu-common.c25
-rw-r--r--include/video/imx-ipu-v3.h1
2 files changed, 26 insertions, 0 deletions
diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c
index e542d5e8a9e1..0a02465ba102 100644
--- a/drivers/gpu/ipu-v3/ipu-common.c
+++ b/drivers/gpu/ipu-v3/ipu-common.c
@@ -536,6 +536,31 @@ int ipu_idmac_disable_channel(struct ipuv3_channel *channel)
}
EXPORT_SYMBOL_GPL(ipu_idmac_disable_channel);
+/*
+ * The imx6 rev. D TRM says that enabling the WM feature will increase
+ * a channel's priority. Refer to Table 36-8 Calculated priority value.
+ * The sub-module that is the sink or source for the channel must enable
+ * watermark signal for this to take effect (SMFC_WM for instance).
+ */
+void ipu_idmac_enable_watermark(struct ipuv3_channel *channel, bool enable)
+{
+ struct ipu_soc *ipu = channel->ipu;
+ unsigned long flags;
+ u32 val;
+
+ spin_lock_irqsave(&ipu->lock, flags);
+
+ val = ipu_idmac_read(ipu, IDMAC_WM_EN(channel->num));
+ if (enable)
+ val |= 1 << (channel->num % 32);
+ else
+ val &= ~(1 << (channel->num % 32));
+ ipu_idmac_write(ipu, val, IDMAC_WM_EN(channel->num));
+
+ spin_unlock_irqrestore(&ipu->lock, flags);
+}
+EXPORT_SYMBOL_GPL(ipu_idmac_enable_watermark);
+
static int ipu_memory_reset(struct ipu_soc *ipu)
{
unsigned long timeout;
diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h
index f24ef9a1dc48..d0cce6e4bcf5 100644
--- a/include/video/imx-ipu-v3.h
+++ b/include/video/imx-ipu-v3.h
@@ -160,6 +160,7 @@ void ipu_idmac_put(struct ipuv3_channel *);
int ipu_idmac_enable_channel(struct ipuv3_channel *channel);
int ipu_idmac_disable_channel(struct ipuv3_channel *channel);
+void ipu_idmac_enable_watermark(struct ipuv3_channel *channel, bool enable);
int ipu_idmac_wait_busy(struct ipuv3_channel *channel, int ms);
void ipu_idmac_set_double_buffer(struct ipuv3_channel *channel,