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gpu: ipu-v3: pre: add double buffer status readback 

This allows the upper layers to check if a double buffer update has
been applied by the PRE or is still pending.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
[p.zabel@pengutronix.de: inverted logic: done -> pending]
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Lucas Stach 2018-09-11 15:20:34 +02:00 committed by Philipp Zabel
parent a3b22b9f11
commit 0a29b1abaf
2 changed files with 7 additions and 0 deletions
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6
drivers/gpu/ipu-v3/ipu-pre.c
View File

@ -265,6 +265,12 @@ void ipu_pre_update(struct ipu_pre *pre, unsigned int bufaddr)
writel(IPU_PRE_CTRL_SDW_UPDATE, pre->regs + IPU_PRE_CTRL_SET);
}
bool ipu_pre_update_pending(struct ipu_pre *pre)
{
return !!(readl_relaxed(pre->regs + IPU_PRE_CTRL) &
IPU_PRE_CTRL_SDW_UPDATE);
}
u32 ipu_pre_get_baddr(struct ipu_pre *pre)
{
return (u32)pre->buffer_paddr;

1
drivers/gpu/ipu-v3/ipu-prv.h
View File

@ -272,6 +272,7 @@ void ipu_pre_configure(struct ipu_pre *pre, unsigned int width,
unsigned int height, unsigned int stride, u32 format,
uint64_t modifier, unsigned int bufaddr);
void ipu_pre_update(struct ipu_pre *pre, unsigned int bufaddr);
bool ipu_pre_update_pending(struct ipu_pre *pre);
struct ipu_prg *ipu_prg_lookup_by_phandle(struct device *dev, const char *name,
int ipu_id);