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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>
This commit is contained in:
Steve Longerbeam 2014-06-25 18:05:44 -07:00 committed by Philipp Zabel
parent 6930afdccf
commit 2bcf577eb6
2 changed files with 26 additions and 0 deletions
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25
drivers/gpu/ipu-v3/ipu-common.c
View File

@ -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;

1
include/video/imx-ipu-v3.h
View File

@ -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,