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gpu: ipu-v3: Add ipu_idmac_clear_buffer() 

Add the reverse of ipu_idmac_select_buffer(), that is, clear a buffer
ready status in a channel.

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 18:05:41 -07:00 committed by Philipp Zabel
parent aa52f57894
commit bce6f087a9
2 changed files with 29 additions and 0 deletions
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28
drivers/gpu/ipu-v3/ipu-common.c
View File

@ -357,6 +357,34 @@ void ipu_idmac_select_buffer(struct ipuv3_channel *channel, u32 buf_num)
}
EXPORT_SYMBOL_GPL(ipu_idmac_select_buffer);
void ipu_idmac_clear_buffer(struct ipuv3_channel *channel, u32 buf_num)
{
struct ipu_soc *ipu = channel->ipu;
unsigned int chno = channel->num;
unsigned long flags;
spin_lock_irqsave(&ipu->lock, flags);
ipu_cm_write(ipu, 0xF0300000, IPU_GPR); /* write one to clear */
switch (buf_num) {
case 0:
ipu_cm_write(ipu, idma_mask(chno), IPU_CHA_BUF0_RDY(chno));
break;
case 1:
ipu_cm_write(ipu, idma_mask(chno), IPU_CHA_BUF1_RDY(chno));
break;
case 2:
ipu_cm_write(ipu, idma_mask(chno), IPU_CHA_BUF2_RDY(chno));
break;
default:
break;
}
ipu_cm_write(ipu, 0x0, IPU_GPR); /* write one to set */
spin_unlock_irqrestore(&ipu->lock, flags);
}
EXPORT_SYMBOL_GPL(ipu_idmac_clear_buffer);
int ipu_idmac_enable_channel(struct ipuv3_channel *channel)
{
struct ipu_soc *ipu = channel->ipu;

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

@ -167,6 +167,7 @@ void ipu_idmac_set_double_buffer(struct ipuv3_channel *channel,
int ipu_idmac_get_current_buffer(struct ipuv3_channel *channel);
bool ipu_idmac_buffer_is_ready(struct ipuv3_channel *channel, u32 buf_num);
void ipu_idmac_select_buffer(struct ipuv3_channel *channel, u32 buf_num);
void ipu_idmac_clear_buffer(struct ipuv3_channel *channel, u32 buf_num);
/*
* IPU Channel Parameter Memory (cpmem) functions