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gpu: ipu-v3: add support for separate alpha channels

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The IPUv3 can read 8-bit alpha values from a separate IDMAC channel driven
by the Alpha Transparency Controller (ATC) for the graphics IDMAC channels.
This allows to reduce memory bandwidth via a conditional read mechanism or
to support planar YUV formats with alpha transparency.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Philipp Zabel
2015-01-09 11:03:13 +01:00
parent ba2b5277dc
commit e72db3b1e5
3 changed files with 85 additions and 0 deletions
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22
include/video/imx-ipu-v3.h
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@@ -161,6 +161,28 @@ enum ipu_channel_irq {
#define IPUV3_CHANNEL_MEM_BG_ASYNC_ALPHA 52
#define IPUV3_NUM_CHANNELS 64
static inline int ipu_channel_alpha_channel(int ch_num)
{
switch (ch_num) {
case IPUV3_CHANNEL_G_MEM_IC_PRP_VF:
return IPUV3_CHANNEL_G_MEM_IC_PRP_VF_ALPHA;
case IPUV3_CHANNEL_G_MEM_IC_PP:
return IPUV3_CHANNEL_G_MEM_IC_PP_ALPHA;
case IPUV3_CHANNEL_MEM_FG_SYNC:
return IPUV3_CHANNEL_MEM_FG_SYNC_ALPHA;
case IPUV3_CHANNEL_MEM_FG_ASYNC:
return IPUV3_CHANNEL_MEM_FG_ASYNC_ALPHA;
case IPUV3_CHANNEL_MEM_BG_SYNC:
return IPUV3_CHANNEL_MEM_BG_SYNC_ALPHA;
case IPUV3_CHANNEL_MEM_BG_ASYNC:
return IPUV3_CHANNEL_MEM_BG_ASYNC_ALPHA;
case IPUV3_CHANNEL_MEM_VDI_PLANE1_COMB:
return IPUV3_CHANNEL_MEM_VDI_PLANE1_COMB_ALPHA;
default:
return -EINVAL;
}
}
int ipu_map_irq(struct ipu_soc *ipu, int irq);
int ipu_idmac_channel_irq(struct ipu_soc *ipu, struct ipuv3_channel *channel,
enum ipu_channel_irq irq);